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revision 927, Fri Sep 14 20:19:53 2001 UTC revision 1250, Fri Jul 5 14:22:42 2002 UTC
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8  The form of an entry should be:  The form of an entry should be:
9    
10  Name:  Name:
11  Date:  Date: yyyy/mm/dd
12  Tag: <post-commit CVS tag>  Tag: <post-commit CVS tag>
13  Description:  Description:
14    
15  ----------------------------------------------------------------------  ----------------------------------------------------------------------
16  Name: Matthias Blume  Name: Matthias Blume
17    Date: 2002/07/05 10:25:00 EDT
18    Tag: blume-20020705-btimp
19    Description:
20    
21    Exported structure BTImp from $smlnj/viscomp/debugprof.cm so that
22    other clients can set up backtracing support.
23    
24    ----------------------------------------------------------------------
25    Name: Matthias Blume
26    Date: 2002/06/25 17:23:00 EDT
27    Tag: blume-20020625-fpmax
28    Description:
29    
30    Fixed a bug in translation of INLMAX (and INLMIN) for the floating-point
31    case.  (The sense of the isNaN test was reversed -- which made min and
32    max always return their first argument.)
33    
34    ----------------------------------------------------------------------
35    Name: Matthias Blume
36    Date: 2002/06/11
37    Tag: blume-20020611-unixpath
38    Description:
39    
40    Back-ported OS.Path.{from,to}UnixPath from idlbasis-devel branch.
41    
42    ----------------------------------------------------------------------
43    Name: Matthias Blume
44    Date: 2002/06/10 16:35:00 EDT
45    Tag: blume-20020610-ieeereal
46    Description:
47    
48    I back-ported my implementation of IEEEReal.fromString from the
49    idlbasis-devel branch so that we can test it.
50    
51    Another small change is that ppDec tries to give more information
52    than just "<sig>" in the case of functors.  However, this code is
53    broken in some mysterious way if the functor's body's signature
54    has not been declared by ascription but gets inferred from the
55    implementation.  This needs fixing...
56    
57    ----------------------------------------------------------------------
58    Name: Matthias Blume
59    Date: 2002/05/31
60    Tag: blume-20020531-btrace-mode
61    Description:
62    
63    Resurrected SMLofNJ.Internals.BTrace.mode.  (It accidentally fell by
64    the wayside when I switched over to using Controls everywhere.)
65    
66    ----------------------------------------------------------------------
67    Name: Lal George
68    Date: 2002/05/23 12:21:40 EDT
69    Tag: george-20020523-visual-labels
70    Description:
71    
72    Labels are now displayed in the graphical output to make
73    the fall-through and target blocks obvious.
74    
75    ----------------------------------------------------------------------
76    Name: Matthias Blume
77    Date: 2002/05/22 11:03:00 EDT
78    Tag: blume-20020522-shrink
79    Description:
80    
81    John tweaked yesterday's fix for 1131 to handle an out-of-memory
82    situation that comes up when allocating huge arrays.
83    
84    ----------------------------------------------------------------------
85    Name: Matthias Blume
86    Date: 2002/05/21 16:00:00 EDT
87    Tag: Release_110_40
88    Description:
89    
90    New working release (110.40).  New bootfiles.
91    
92    [Also: John Reppy fixed GC bug 1131.]
93    
94    ----------------------------------------------------------------------
95    Name: Matthias Blume
96    Date: 2002/05/21 12:35:00 EDT
97    Tag: blume-20020521-cmdoc
98    Description:
99    
100    CM documentation update.
101    
102    ----------------------------------------------------------------------
103    Name: Matthias Blume
104    Date: 2002/05/21 10:55:00 EDT
105    Tag: blume-20020521-misc
106    Description:
107    
108    - John tweaked runtime to be silent on heap export (except when
109      GC messages are on).
110    - I added a few more things (cross-compiling versions of CMB) to
111      config/preloads (as suggestions).
112    
113    ----------------------------------------------------------------------
114    Name: Matthias Blume
115    Date: 2002/05/20 22:25:00 EDT
116    Tag: blume-20020520-controls
117    Description:
118    
119    - Added ControlUtil structure to control-lib.cm.
120    - Use it throughout.
121    - Used Controls facility to define MLRISC controls (as opposed to
122      registering MLRISC control ref cells with Controls after the fact)
123    - Fixed messed-up controls priorities.
124    
125    * Removed again all the stuff from config/preloads that one wouldn't
126      be able to preload at the time the initial heap image is built.
127      (Many libraries, e.g., CML, do not exist yet at this time.  The
128       only libraries that can be preloaded via config/preloads are those
129       that come bundled with the bootfiles.)
130    
131    ----------------------------------------------------------------------
132    Name: Matthias Blume
133    Date: 2002/05/20 10:59:00 EDT
134    Tag: blume-20020520-preloads
135    Description:
136    
137    Added a lot of commented-out suggestions for things to be included
138    in config/preloads.
139    
140    ----------------------------------------------------------------------
141    Name: Allen Leung
142    Date: 2002/05/18 14:20:00 EDT
143    Tag: leunga-20020518-mdl
144    Description:
145    
146    o Made the mdl tool stuff compile and run again.
147    o I've disabled all the stuff that depends on RTL specifications; they
148      are all badly broken anyway.
149    
150    ----------------------------------------------------------------------
151    Name: Matthias Blume
152    Date: 2002/05/17 16:49:00 EDT
153    Tag: blume-20020517-controls
154    Description:
155    
156    0. John Reppy made several modifications to the SML/NJ library.
157       In particular, there is a shiny new controls-lib.cm.
158    
159    1. Pushed new controls interface through compiler so that everything
160       compiles again.
161    
162    2. Added FormatComb and FORMAT_COMB to the CML version of the
163       SML/NJ library (so that CML compiles again).
164    
165    3. Modified init scripts because XXX_DEFAULT environment variables
166       are no longer with us.  (Boot-time initialization is now done
167       using the same environment variables that are also used for
168       startup-time initialization of controls.)
169    
170    ----------------------------------------------------------------------
171    Name: Lal George
172    Date: 2002/05/15 09:20:10 EDT
173    Tag: george-20020515-pseudo-op-decls
174    Description:
175    
176            All pseudo-ops emitted before the first segment declaration
177    such as TEXT, DATA, and BSS directives are assumed to be global
178    declarations and are emitted first in the assembly file. This is
179    useful in a number of situations where one has pseudo-ops that are not
180    specific to any segment, and also works around the constraint that one
181    cannot have client pseudo-ops in the TEXT segment.
182    
183            Because no segment is associated with these declarations it is
184    an error to allocate any space or objects before the first segment
185    directive and an exception will be raised. However, we cannot make
186    this check for client pseudo-ops.
187    
188            These top level declarations are a field in the CFG graph_info.
189    In theory you can continue to add to this field after the CFG has been
190    built -- provided you know what you are doing;-)
191    
192    ----------------------------------------------------------------------
193    Name: Matthias Blume
194    Date: 2002/05/13 16:40:00 EDT
195    Tag: blume-20020513-pp-etc
196    Description:
197    
198    A few minor bugfixes:
199    
200      - Stopgap measure for bug recently reported by Elsa Gunter (ppDec).
201        (Bogus printouts for redefined bindings still occur.  Compiler
202        bug should no longer occur now.  We need to redo the prettyprinter
203        from scratch.)
204    
205      - CM pathname printer now also adds escape sequences for ( and )
206    
207      - commend and docu fixes for ml-nlffi
208    
209    ----------------------------------------------------------------------
210    Name: Matthias Blume
211    Date: 2002/05/10 16:40:00 EDT
212    Tag: blume-20020510-erg-textio
213    Description:
214    
215    Applied the following bugfix provided by Emden Gansner:
216    
217        Output is corrupted when outputSubstr is used rather than output.
218    
219        The problem occurs when a substring
220    
221            ss = (s, dataStart, dataLen)
222    
223        where dataStart > 0, fills a stream buffer with avail bytes left.
224        avail bytes of s, starting at index dataStart, are copied into the
225        buffer, the buffer is flushed, and then the remaining dataLen-avail
226        bytes of ss are copied into the beginning of the buffer. Instead of
227        starting this copy at index dataStart+avail in s, the current code
228        starts the copy at index avail.
229    
230        Fix:
231        In text-io-fn.sml, change line 695 from
232             val needsFlush = copyVec(v, avail, dataLen-avail, buf, 0)
233        to
234             val needsFlush = copyVec(v, dataStart+avail, dataLen-avail, buf, 0)
235    
236    ----------------------------------------------------------------------
237    Name: Matthias Blume
238    Date: 2002/04/12 13:55:00 EDT
239    Tag: blume-20020412-assyntax
240    Description:
241    
242    1. Grabbed newer assyntax.h from the XFree86 project.
243    2. Fiddled with how to compile X86.prim.asm without warnings.
244    3. (Very) Minor cleanup in CM.
245    
246    ----------------------------------------------------------------------
247    Name: Matthias Blume
248    Date: 2002/04/01 (no joke!) 17:07:00 EST
249    Tag: blume-20020401-x86div
250    Description:
251    
252    Added full support for div/mod/rem/quot on the x86, using the machine
253    instruction's two results (without clumsily recomputing the remainder)
254    directly where appropriate.
255    
256    Some more extensive power-of-two support was added to the x86 instruction
257    selector (avoiding expensive divs, mods, and muls where they can be
258    replaced with cheaper shifts and masks).  However, this sort of thing
259    ought to be done earlier, e.g., within the CPS optimizer so that
260    all architectures benefit from it.
261    
262    The compiler compiles to a fixed point, but changes might be somewhat
263    fragile nevertheless.  Please, report any strange things that you might
264    see wrt. div/mod/quot/rem...
265    
266    ----------------------------------------------------------------------
267    Name: Matthias Blume
268    Date: 2002/03/29 17:22:00
269    Tag: blume-20020329-div
270    Description:
271    
272    Fixed my broken div/mod logic.  Unfortunately, this means that the
273    inline code for div/mod now has one more comparison than before.
274    Fast paths (quotient > 0 or remainder = 0) are not affected, though.
275    The problem was with quotient = 0, because that alone does not tell
276    us which way the rounding went.  One then has to look at whether
277    remainder and divisor have the same sign...  :(
278    
279    Anyway, I replaced the bootfiles with fresh ones...
280    
281    ----------------------------------------------------------------------
282    Name: Matthias Blume
283    Date: 2002/03/29 14:10:00 EST
284    Tag: blume-20020329-inlprims
285    Description:
286    
287    NEW BOOTFILES!!!    Version number bumped to 110.39.3.
288    
289    Primops have changed. This means that the bin/boot-file formats have
290    changed as well.
291    
292    To make sure that there is no confusion, I made a new version.
293    
294    
295    CHANGES:
296    
297    * removed REMT from mltree (remainder should never overflow).
298    
299    * added primops to deal with divisions of all flavors to the frontend
300    
301    * handled these primops all the way through so they map to their respective
302      MLRISC support
303    
304    * used these primops in the implementation of Int, Int32, Word, Word32
305    
306    * removed INLDIV, INLMOD, and INLREM as they are no longer necessary
307    
308    * parameterized INLMIN, INLMAX, and INLABS by a numkind
309    
310    * translate.sml now deals with all flavors of INL{MIN,MAX,ABS}, including
311      floating point
312    
313    * used INL{MIN,MAX,ABS} in the implementation of Int, Int32, Word, Word32,
314      and Real (but Real.abs maps to a separate floating-point-only primop)
315    
316    
317    TODO items:
318    
319    * Hacked Alpha32 instruction selection, disabling the selection of REMx
320      instructions because the machine instruction encoder cannot handle
321      them.  (Hppa, PPC, and Sparc instruction selection did not handle
322      REM in the first place, and REM is supported by the x86 machine coder.)
323    
324    * Handle DIV and MOD with DIV_TO_NEGINF directly in the x86 instruction
325      selection phase.  (The two can be streamlined because the hardware
326      delivers both quotient and remainder at the same time anyway.)
327    
328    * Think about what to do with "valOf(Int32.minInt) div ~1" and friends.
329      (Currently the behavior is inconsistent both across architectures and
330      wrt. the draft Basis spec.)
331    
332    * Word8 should eventually be handled natively, too.
333    
334    * There seems to be one serious bug in mltree-gen.sml.  It appears, though,
335      as if there currently is no execution path that could trigger it in
336      SML/NJ.  (The assumptions underlying functions arith and promotable do not
337      hold for things like multiplication and division.)
338    
339    ----------------------------------------------------------------------
340    Name: Matthias Blume
341    Date: 2002/03/27 16:27:00 EST
342    Tag: blume-20020327-mlrisc-divisions
343    Description:
344    
345    Added support for all four division operations (ML's div, mod, quot,
346    and rem) to MLRISC.  In the course of doing so, I also rationalized
347    the naming (no more annoying switch-around of DIV and QUOT), by
348    parameterizing the operation by div_rounding_mode (which can be either
349    DIV_TO_ZERO or DIV_TO_NEGINF).
350    
351    The generic MLTreeGen functor takes care of compiling all four
352    operations down to only round-to-zero div.
353    
354    Missing pieces:
355    
356      * Doing something smarter than relying on MLTreeGen on architectures
357        like, e.g., the x86 where hardware division delivers both quotient and
358        remainder at the same time.  With this, the implementation of the
359        round-to-neginf operations could be further streamlined.
360    
361      * Remove inlining support for div/mod/rem from the frontend and replace it
362        with primops that get carried through to the backend.  Do this for all
363        int and word types.
364    
365    ----------------------------------------------------------------------
366    Name: Matthias Blume
367    Date: 2002/03/25 17:25:00 EST
368    Tag: blume-20020325-divmod
369    Description:
370    
371    I improved (hopefully without breaking them) the implementation of Int.div,
372    Int.mod, and Int.rem.   For this, the code in translate.sml now takes
373    advantage of the following observations:
374    
375      Let  q = x quot y      r = x rem y
376           d = x div  y      m = x mod y
377    
378    where "quot" is the round-to-zero version of integer division that
379    hardware usually provides.  Then we have:
380    
381         r = x - q * y        where neither the * nor the - will overflow
382         d = if q >= 0 orelse x = q * y then q else q - 1
383                              where neither the * nor the - will overflow
384         m = if q >= 0 orelse r = 0 then r else r + y
385                              where the + will not overflow
386    
387    This results in substantial simplification of the generated code.
388    The following table shows the number of CFG nodes and edges generated
389    for
390            fun f (x, y) = x OPER y
391            (* with OPER \in div, mod, quot, rem *)
392    
393    
394        OPER | nodes(old) | edges(old) | nodes(new) | edges(new)
395        --------------------------------------------------------
396         div |         24 |         39 |         12 |         16
397         mod |         41 |         71 |         12 |         16
398        quot |          8 |         10 |          8 |         10
399         rem |         10 |         14 |          8 |         10
400    
401    
402    ----------------------------------------------------------------------
403    Name: Matthias Blume
404    Date: 2002/03/25 22:06:00 EST
405    Tag: blume-20020325-cprotobug
406    Description:
407    
408    Fixed a bug in cproto (c prototype decoder).
409    
410    ----------------------------------------------------------------------
411    Name: Matthias Blume
412    Date: 2002/03/25 16:00:00 EST
413    Tag: blume-20020325-raw-primops
414    Description:
415    
416    I did some cleanup to Allen's new primop code and
417    replaced yesterday's bootfiles with new ones.
418    (But they are stored in the same place.)
419    
420    ----------------------------------------------------------------------
421    Name: Matthias Blume
422    Date: 2002/03/24 22:40:00 EST
423    Tag: blume-20020324-bootfiles
424    Description:
425    
426    Made the bootfiles that Allen asked for.
427    
428    ----------------------------------------------------------------------
429    Name: Allen Leung
430    Date: 2002/03/23 15:50:00 EST
431    Tag: leunga-20020323-flint-cps-rcc-primops
432    Description:
433    
434      1. Changes to FLINT primops:
435    
436        (* make a call to a C-function;
437         * The primop carries C function prototype information and specifies
438         * which of its (ML-) arguments are floating point. C prototype
439         * information is for use by the backend, ML information is for
440         * use by the CPS converter. *)
441      | RAW_CCALL of { c_proto: CTypes.c_proto,
442                       ml_args: ccall_type list,
443                       ml_res_opt: ccall_type option,
444                       reentrant : bool
445                     } option
446       (* Allocate uninitialized storage on the heap.
447        * The record is meant to hold short-lived C objects, i.e., they
448        * are not ML pointers.  With the tag, the representation is
449        * the same as RECORD with tag tag_raw32 (sz=4), or tag_fblock (sz=8)
450        *)
451      | RAW_RECORD of {tag:bool,sz:int}
452      and ccall_type = CCALL_INT32 | CCALL_REAL64 | CCALL_ML_PTR
453    
454      2.  These CPS primops are now overloaded:
455    
456           rawload of {kind:numkind}
457           rawstore of {kind:numkind}
458    
459          The one argument form is:
460    
461             rawload {kind} address
462    
463          The two argument form is:
464    
465             rawload {kind} [ml object, byte-offset]
466    
467      3. RAW_CCALL/RCC now takes two extra arguments:
468    
469         a. The first is whether the C call is reentrant, i.e., whether
470            ML state should be saved and restored.
471         b. The second argument is a string argument specifying the name of
472            library and the C function.
473    
474         These things are currently not handled in the code generator, yet.
475    
476      4. In CProto,
477    
478         An encoding type of "bool" means "ml object" and is mapped into
479         C prototype of PTR.  Note that "bool" is different than "string",
480         even though "string" is also mapped into PTR, because "bool"
481         is assigned an CPS type of BOGt, while "string" is assigned INT32t.
482    
483      5. Pickler/unpicker
484    
485         Changed to handle RAW_RECORD and newest RAW_CCALL
486    
487      6. MLRiscGen,
488    
489         1. Changed to handle the new rawload/rawstore/rawrecord operators.
490         2. Code for handling C Calls has been moved to a new module CPSCCalls,
491            in the file CodeGen/cpscompile/cps-c-calls.sml
492    
493      7. Added the conditional move operator
494    
495             condmove of branch
496    
497         to cps.  Generation of this is still buggy so it is currently
498         disabled.
499    
500    ----------------------------------------------------------------------
501    Name: Lal George
502    Date: 2002/03/22 14:18:25 EST
503    Tag: george-20020322-cps-branch-prob
504    Description:
505    
506    Implemented the Ball-Larus branch prediction-heuristics, and
507    incorporated graphical viewers for control flow graphs.
508    
509    Ball-Larus Heuristics:
510    ---------------------
511    See the file compiler/CodeGen/cpscompile/cpsBranchProb.sml.
512    
513    By design it uses the Dempster-Shafer theory for combining
514    probabilities.  For example, in the function:
515    
516        fun f(n,acc) = if n = 0 then acc else f(n-1, n*acc)
517    
518    the ball-larus heuristics predicts that the n=0 is unlikely
519    (OH-heuristic), and the 'then' branch is unlikely because of the
520    RH-heuristic -- giving the 'then' branch an even lower combined
521    probability using the Dempster-Shafer theory.
522    
523    Finally, John Reppy's loop analysis in MLRISC, further lowers the
524    probability of the 'then' branch because of the loop in the else
525    branch.
526    
527    
528    Graphical Viewing:
529    ------------------
530    I merely plugged in Allen's graphical viewers into the compiler. The
531    additional code is not much. At the top level, saying:
532    
533            Control.MLRISC.getFlag "cfg-graphical-view" := true;
534    
535    will display the graphical view of the control flow graph just before
536    back-patching.  daVinci must be in your path for this to work. If
537    daVinci is not available, then the default viewer can be changed
538    using:
539    
540            Control.MLRISC.getString "viewer"
541    
542    which can be set to "dot" or "vcg" for the corresponding viewers. Of
543    course, these viewers must be in your path.
544    
545    The above will display the compilation unit at the level of clusters,
546    many of which are small, boring, and un-interesting. Also setting:
547    
548            Control.MLRISC.getInt "cfg-graphical-view_size"
549    
550    will display clusters that are larger than the value set by the above.
551    
552    
553    ----------------------------------------------------------------------
554    Name: Matthias Blume
555    Date: 2002/03/21 22:20:00 EST
556    Tag: blume-20020321-kmp-bugfix
557    Description:
558    
559    Changed the interface to the KMP routine in PreString and fixed
560    a minor bug in one place where it was used.
561    
562    ----------------------------------------------------------------------
563    Name: Allen Leung
564    Date: 2002/03/21 20:30:00 EST
565    Tag: leunga-20020321-cfg
566    Description:
567    
568      Fixed a potential problem in cfg edge splitting.
569    
570    ----------------------------------------------------------------------
571    Name: Allen Leung
572    Date: 2002/03/21 17:15:00 EST
573    Tag: leunga-20020321-x86-fp-cfg
574    Description:
575    
576      1. Recoded the buggy parts of x86-fp.
577    
578         a. All the block reordering code has been removed.
579            We now depend on the block placement phases to do this work.
580    
581         b. Critical edge splitting code has been simplified and moved into the
582            CFG modules, as where they belong.
583    
584         Both of these were quite buggy and complex.  The code is now much, much
585         simpler.
586    
587      2. X86 backend.
588    
589         a. Added instructions for 64-bit support.  Instruction selection for
590            64-bit has not been committed, however, since that
591            requires changes to MLTREE which haven't been approved by
592            Lal and John.
593    
594         b. Added support for FUCOMI and FUCOMIP when generating code for
595            PentiumPro and above.  We only generate these instructions in
596            the fast-fp mode.
597    
598         c. Added cases for JP and JNP in X86FreqProps.
599    
600      3. CFG
601    
602         CFG now has a bunch of methods for edge splitting and merging.
603    
604      4. Machine description.
605    
606         John's simplification of MLTREE_BASIS.fcond broke a few machine
607         description things:
608    
609         rtl-build.{sig,sml} and hppa.mdl fixed.
610    
611         NOTE: the machine description stuff in the repository is still broken.
612               Again, I can't put my fixes in because that involves
613               changes to MLTREE.
614    
615    ----------------------------------------------------------------------
616    Name: Matthias Blume
617    Date: 2002/03/20 15:55:00 EST
618    Tag: blume-20020320-kmp
619    Description:
620    
621    Implemented Knuth-Morris-Pratt string matching in PreString and used
622    it for String.isSubstring, Substring.isSubstring, and
623    Substring.position.
624    
625    (Might need some stress-testing.  Simple examples worked fine.)
626    
627    ----------------------------------------------------------------------
628    Name: Matthias Blume
629    Date: 2002/03/19 16:37:00 EST
630    Tag: blume-20020319-witnesses
631    Description:
632    
633    Added a structure C.W and functions convert/Ptr.convert to ml-nlffi-lib.
634    
635    This implements a generic mechanism for changing constness qualifiers
636    anywhere within big C types without resorting to outright "casts".
637    (So far, functions such as C.rw/C.ro or C.Ptr.rw/C.Ptr.ro only let you
638    modify the constness at the outermost level.)
639    The implementation of "convert" is based on the idea of "witness"
640    values -- values that are not used by the operation but whose types
641    "testify" to their applicability.  On the implementation side, "convert"
642    is simply a projection (returning its second curried argument).  With
643    cross-module inlining, it should not result in any machine code being
644    generated.
645    
646    ----------------------------------------------------------------------
647    Name: Matthias Blume
648    Date: 2002/03/15 16:40:00 EST
649    Tag: blume-20020315-basis
650    Description:
651    
652    Provided (preliminary?) implementations for
653    
654      {String,Substring}.{concatWith,isSuffix,isSubstring}
655    
656    and
657    
658      Substring.full
659    
660    Those are in the Basis spec but they were missing in SML/NJ.
661    
662    ----------------------------------------------------------------------
663    Name: Matthias Blume
664    Date: 2002/03/14 21:30:00 EST
665    Tag: blume-20020314-controls
666    Description:
667    
668    Controls:
669    ---------
670    
671    1. Factored out the recently-added Controls : CONTROLS stuff and put
672       it into its own library $/controls-lib.cm.  The source tree for
673       this is under src/smlnj-lib/Controls.
674    
675    2. Changed the names of types and functions in this interface, so they
676       make a bit more "sense":
677    
678          module -> registry
679          'a registry -> 'a group
680    
681    3. The interface now deals in ref cells only.  The getter/setter interface
682       is (mostly) gone.
683    
684    4. Added a function that lets one register an already-existing ref cell.
685    
686    5. Made the corresponding modifications to the rest of the code so that
687       everything compiles again.
688    
689    6. Changed the implementation of Controls.MLRISC back to something closer
690       to the original.  In particular, this module (and therefore MLRISC)
691       does not depend on Controls.  There now is some link-time code in
692       int-sys.sml that registers the MLRISC controls with the Controls
693       module.
694    
695    CM:
696    ---
697    
698      * One can now specify the lambda-split aggressiveness in init.cmi.
699    
700    ----------------------------------------------------------------------
701    Name: Allen Leung
702    Date: 2002/03/13 17:30:00 EST
703    Tag: leunga-20020313-x86-fp-unary
704    Description:
705    
706    Bug fix for:
707    
708    > leunga@weaselbane:~/Yale/tmp/sml-dist{21} bin/sml
709    > Standard ML of New Jersey v110.39.1 [FLINT v1.5], March 08, 2002
710    > - fun f(x,(y,z)) = Real.~ y;
711    > [autoloading]
712    > [autoloading done]
713    >       fchsl   (%eax), 184(%esp)
714    > Error: MLRisc bug: X86MCEmitter.emitInstr
715    >
716    > uncaught exception Error
717    >   raised at: ../MLRISC/control/mlriscErrormsg.sml:16.14-16.19
718    
719    The problem was that the code generator did not generate any fp registers
720    in this case, and the ra didn't know that it needed to run the X86FP phase to
721    translate the pseudo fp instruction.   This only happened with unary fp
722    operators in certain situations.
723    
724    ----------------------------------------------------------------------
725    Name: Matthias Blume
726    Date: 2002/03/13 14:00:00 EST
727    Tag: blume-20020313-overload-etc
728    Description:
729    
730    1. Added _overload as a synonym for overload for backward compatibility.
731       (Control.overloadKW must be true for either version to be accepted.)
732    
733    2. Fixed bug in install script that caused more things to be installed
734       than what was requested in config/targets.
735    
736    3. Made CM aware of the (_)overload construct so that autoloading
737       works.
738    
739    ----------------------------------------------------------------------
740    Name: Matthias Blume
741    Date: 2002/03/12 22:03:00 EST
742    Tag: blume-20020312-url
743    Description:
744    
745    Forgot to update BOOT and srcarchiveurl.
746    
747    ----------------------------------------------------------------------
748    Name: Matthias Blume
749    Date: 2002/03/12 17:30:00 EST
750    Tag: blume-20020312-version110392
751    Description:
752    
753    Yet another version number bump (because of small changes to the
754    binfile format).  Version number is now 110.39.2.  NEW BOOTFILES!
755    
756    Changes:
757    
758      The new pid generation scheme described a few weeks ago was overly
759      complicated.  I implemented a new mechanism that is simpler and
760      provides a bit more "stability":  Once CM has seen a compilation
761      unit, it keeps its identity constant (as long as you do not delete
762      those crucial CM/GUID/* files).  This means that when you change
763      an interface, compile, then go back to the old interface, and
764      compile again, you arrive at the original pid.
765    
766      There now also is a mechanism that instructs CM to use the plain
767      environment hash as a module's pid (effectively making its GUID
768      the empty string).  For this, "noguid" must be specified as an
769      option to the .sml file in question within its .cm file.
770      This is most useful for code that is being generated by tools such
771      as ml-nlffigen (because during development programmers tend to
772      erase the tool's entire output directory tree including CM's cached
773      GUIDs).  "noguid" is somewhat dangerous (since it can be used to locally
774      revert to the old, broken behavior of SML/NJ, but in specific cases
775      where there is no danger of interface confusion, its use is ok
776      (I think).
777    
778      ml-nlffigen by default generates "noguid" annotations.  They can be
779      turned off by specifying -guid in its command line.
780    
781    ----------------------------------------------------------------------
782    Name: Lal George
783    Date: 2002/03/12 12 14:42:36 EST
784    Tag: george-20020312-frequency-computation
785    Description:
786    
787    Integrated jump chaining and static block frequency into the
788    compiler. More details and numbers later.
789    
790    ----------------------------------------------------------------------
791    Name: Lal George
792    Date: 2002/03/11 11 22:38:53 EST
793    Tag: george-20020311-jump-chain-elim
794    Description:
795    
796    Tested the jump chain elimination on all architectures (except the
797    hppa).  This is on by default right now and is profitable for the
798    alpha and x86, however, it may not be profitable for the sparc and ppc
799    when compiling the compiler.
800    
801    The gc test will typically jump to a label at the end of the cluster,
802    where there is another jump to an external cluster containing the actual
803    code to invoke gc. This is to allow factoring of common gc invocation
804    sequences. That is to say, we generate:
805    
806            f:
807               testgc
808               ja   L1      % jump if above to L1
809    
810            L1:
811               jmp L2
812    
813    
814    After jump chain elimination the 'ja L1' instructions is converted to
815    'ja L2'. On the sparc and ppc, many of the 'ja L2' instructions may end
816    up being implemented in their long form (if L2 is far away) using:
817    
818            jbe     L3      % jump if below or equal to L3
819            jmp     L2
820         L3:
821            ...
822    
823    
824    For large compilation units L2  may be far away.
825    
826    
827    ----------------------------------------------------------------------
828    Name: Matthias Blume
829    Date: 2002/03/11 13:30:00 EST
830    Tag: blume-20020311-mltreeeval
831    Description:
832    
833    A functor parameter was missing.
834    
835    ----------------------------------------------------------------------
836    Name: Allen Leung
837    Date: 2002/03/11 10:30:00 EST
838    Tag: leunga-20020311-runtime-string0
839    Description:
840    
841       The representation of the empty string now points to a
842    legal null terminated C string instead of unit.  It is now possible
843    to convert an ML string into C string with InlineT.CharVector.getData.
844    This compiles into one single machine instruction.
845    
846    ----------------------------------------------------------------------
847    Name: Allen Leung
848    Date: 2002/03/10 23:55:00 EST
849    Tag: leunga-20020310-x86-call
850    Description:
851    
852       Added machine generation for CALL instruction (relative displacement mode)
853    
854    ----------------------------------------------------------------------
855    Name: Matthias Blume
856    Date: 2002/03/08 16:05:00
857    Tag: blume-20020308-entrypoints
858    Description:
859    
860    Version number bumped to 110.39.1.  NEW BOOTFILES!
861    
862    Entrypoints: non-zero offset into a code object where execution should begin.
863    
864    - Added the notion of an entrypoint to CodeObj.
865    - Added reading/writing of entrypoint info to Binfile.
866    - Made runtime system bootloader aware of entrypoints.
867    - Use the address of the label of the first function given to mlriscGen
868      as the entrypoint.  This address is currently always 0, but it will
869      not be 0 once we turn on block placement.
870    - Removed the linkage cluster code (which was The Other Way(tm) of dealing
871      with entry points) from mlriscGen.
872    
873    ----------------------------------------------------------------------
874    Name: Allen Leung
875    Date: 2002/03/07 20:45:00 EST
876    Tag: leunga-20020307-x86-cmov
877    Description:
878    
879       Bug fixes for CMOVcc on x86.
880    
881       1. Added machine code generation for CMOVcc
882       2. CMOVcc is now generated in preference over SETcc on PentiumPro or above.
883       3. CMOVcc cannot have an immediate operand as argument.
884    
885    ----------------------------------------------------------------------
886    Name: Matthias Blume
887    Date: 2002/03/07 16:15:00 EST
888    Tag: blume-20020307-controls
889    Description:
890    
891    This is a very large but mostly boring patch which makes (almost)
892    every tuneable compiler knob (i.e., pretty much everything under
893    Control.* plus a few other things) configurable via both the command
894    line and environment variables in the style CM did its configuration
895    until now.
896    
897    Try starting sml with '-h' (or, if you are brave, '-H')
898    
899    To this end, I added a structure Controls : CONTROLS to smlnj-lib.cm which
900    implements the underlying generic mechanism.
901    
902    The interface to some of the existing such facilities has changed somewhat.
903    For example, the MLRiscControl module now provides mkFoo instead of getFoo.
904    (The getFoo interface is still there for backward-compatibility, but its
905    use is deprecated.)
906    
907    The ml-build script passes -Cxxx=yyy command-line arguments through so
908    that one can now twiddle the compiler settings when using this "batch"
909    compiler.
910    
911    TODO items:
912    
913    We should go through and throw out all controls that are no longer
914    connected to anything.  Moreover, we should go through and provide
915    meaningful (and correct!) documentation strings for those controls
916    that still are connected.
917    
918    Currently, multiple calls to Controls.new are accepted (only the first
919    has any effect).  Eventually we should make sure that every control
920    is being made (via Controls.new) exactly once.  Future access can then
921    be done using Controls.acc.
922    
923    Finally, it would probably be a good idea to use the getter-setter
924    interface to controls rather than ref cells.  For the time being, both
925    styles are provided by the Controls module, but getter-setter pairs are
926    better if thread-safety is of any concern because they can be wrapped.
927    
928    *****************************************
929    
930    One bug fix: The function blockPlacement in three of the MLRISC
931    backpatch files used to be hard-wired to one of two possibilities at
932    link time (according to the value of the placementFlag).  But (I
933    think) it should rather sense the flag every time.
934    
935    *****************************************
936    
937    Other assorted changes (by other people who did not supply a HISTORY entry):
938    
939    1. the cross-module inliner now works much better (Monnier)
940    2. representation of weights, frequencies, and probabilities in MLRISC
941       changed in preparation of using those for weighted block placement
942       (Reppy, George)
943    
944    ----------------------------------------------------------------------
945    Name: Lal George
946    Date: 2002/03/07 14:44:24 EST 2002
947    Tag: george-20020307-weighted-block-placement
948    
949    Tested the weighted block placement optimization on all architectures
950    (except the hppa) using AMPL to generate the block and edge frequencies.
951    Changes were required in the machine properties to correctly
952    categorize trap instructions. There is an MLRISC flag
953    "weighted-block-placement" that can be used to enable weighted block
954    placement, but this will be ineffective without block/edge
955    frequencies (coming soon).
956    
957    
958    ----------------------------------------------------------------------
959    Name: Lal George
960    Date: 2002/03/05 17:24:48 EST
961    Tag: george-20020305-linkage-cluster
962    
963    In order to support the block placement optimization, a new cluster
964    is generated as the very first cluster (called the linkage cluster).
965    It contains a single jump to the 'real' entry point for the compilation
966    unit. Block placement has no effect on the linkage cluster itself, but
967    all the other clusters  have full freedom in the manner in which they
968    reorder blocks or functions.
969    
970    On the x86 the typical linkage code that is generated is:
971       ----------------------
972            .align 2
973       L0:
974            addl    $L1-L0, 72(%esp)
975            jmp     L1
976    
977    
978            .align  2
979       L1:
980       ----------------------
981    
982    72(%esp) is the memory location for the stdlink register. This
983    must contain the address of the CPS function being called. In the
984    above example, it contains the address of  L0; before
985    calling L1 (the real entry point for the compilation unit), it
986    must contain the address for L1, and hence
987    
988            addl $L1-L0, 72(%esp)
989    
990    I have tested this on all architectures except the hppa.The increase
991    in code size is of course negligible
992    
993    ----------------------------------------------------------------------
994    Name: Allen Leung
995    Date: 2002/03/03 13:20:00 EST
996    Tag: leunga-20020303-mlrisc-tools
997    
998      Added #[ ... ] expressions to mlrisc tools
999    
1000    ----------------------------------------------------------------------
1001    Name: Matthias Blume
1002    Date: 2002/02/27 12:29:00 EST
1003    Tag: blume-20020227-cdebug
1004    Description:
1005    
1006    - made types in structure C and C_Debug to be equal
1007    - got rid of code duplication (c-int.sml vs. c-int-debug.sml)
1008    - there no longer is a C_Int_Debug (C_Debug is directly derived from C)
1009    
1010    ----------------------------------------------------------------------
1011    Name: Matthias Blume
1012    Date: 2002/02/26 12:00:00 EST
1013    Tag: blume-20020226-ffi
1014    Description:
1015    
1016    1. Fixed a minor bug in CM's "noweb" tool:
1017       If numbering is turned off, then truly don't number (i.e., do not
1018       supply the -L option to noweb).  The previous behavior was to supply
1019       -L'' -- which caused noweb to use the "default" line numbering scheme.
1020       Thanks to Chris Richards for pointing this out (and supplying the fix).
1021    
1022    2. Once again, I reworked some aspects of the FFI:
1023    
1024       A. The incomplete/complete type business:
1025    
1026       - Signatures POINTER_TO_INCOMPLETE_TYPE and accompanying functors are
1027         gone!
1028       - ML types representing an incomplete type are now *equal* to
1029         ML types representing their corresponding complete types (just like
1030         in C).  This is still safe because ml-nlffigen will not generate
1031         RTTI for incomplete types, nor will it generate functions that
1032         require access to such RTTI.   But when ML code generated from both
1033         incomplete and complete versions of the C type meet, the ML types
1034         are trivially interoperable.
1035    
1036         NOTE:  These changes restore the full generality of the translation
1037         (which was previously lost when I eliminated functorization)!
1038    
1039       B. Enum types:
1040    
1041       - Structure C now has a type constructor "enum" that is similar to
1042         how the "su" constructor works.  However, "enum" is not a phantom
1043         type because each "T enum" has values (and is isomorphic to
1044         MLRep.Signed.int).
1045       - There are generic access operations for enum objects (using
1046         MLRep.Signed.int).
1047       - ml-nlffigen will generate a structure E_foo for each "enum foo".
1048         * The structure contains the definition of type "mlrep" (the ML-side
1049         representation type of the enum).  Normally, mlrep is the same
1050         as "MLRep.Signed.int", but if ml-nlffigen was invoked with "-ec",
1051         then mlrep will be defined as a datatype -- thus facilitating
1052         pattern matching on mlrep values.
1053         ("-ec" will be suppressed if there are duplicate values in an
1054          enumeration.)
1055         * Constructors ("-ec") or values (no "-ec") e_xxx of type mlrep
1056         will be generated for each C enum constant xxx.
1057         * Conversion functions m2i and i2m convert between mlrep and
1058         MLRep.Signed.int.  (Without "-ec", these functions are identities.)
1059         * Coversion functions c and ml convert between mlrep and "tag enum".
1060         * Access functions (get/set) fetch and store mlrep values.
1061       - By default (unless ml-nlffigen was invoked with "-nocollect"), unnamed
1062         enumerations are merged into one single enumeration represented by
1063         structure E_'.
1064    
1065    ----------------------------------------------------------------------
1066    Name: Allen Leung
1067    Date: 2002/02/25 04:45:00 EST
1068    Tag: leunga-20020225-cps-spill
1069    
1070    This is a new implementation of the CPS spill phase.
1071    The new phase is in the new file compiler/CodeGen/cpscompile/spill-new.sml
1072    In case of problems, replace it with the old file spill.sml
1073    
1074    The current compiler runs into some serious performance problems when
1075    constructing a large record.  This can happen when we try to compile a
1076    structure with many items.  Even a very simple structure like the following
1077    makes the compiler slow down.
1078    
1079        structure Foo = struct
1080           val x_1 = 0w1 : Word32.int
1081           val x_2 = 0w2 : Word32.int
1082           val x_3 = 0w3 : Word32.int
1083           ...
1084           val x_N = 0wN : Word32.int
1085        end
1086    
1087    The following table shows the compile time, from N=1000 to N=4000,
1088    with the old compiler:
1089    
1090    N
1091    1000   CPS 100 spill                           0.04u  0.00s  0.00g
1092           MLRISC ra                               0.06u  0.00s  0.05g
1093              (spills = 0 reloads = 0)
1094           TOTAL                                   0.63u  0.07s  0.21g
1095    
1096    1100   CPS 100 spill                           8.25u  0.32s  0.64g
1097           MLRISC ra                               5.68u  0.59s  3.93g
1098              (spills = 0 reloads = 0)
1099           TOTAL                                   14.71u  0.99s  4.81g
1100    
1101    1500   CPS 100 spill                           58.55u  2.34s  1.74g
1102           MLRISC ra                               5.54u  0.65s  3.91g
1103              (spills = 543 reloads = 1082)
1104           TOTAL                                   65.40u  3.13s  6.00g
1105    
1106    2000   CPS 100 spill                           126.69u  4.84s  3.08g
1107           MLRISC ra                               0.80u  0.10s  0.55g
1108              (spills = 42 reloads = 84)
1109           TOTAL                                   129.42u  5.10s  4.13g
1110    
1111    3000   CPS 100 spill                           675.59u  19.03s  11.64g
1112           MLRISC ra                               2.69u  0.27s  1.38g
1113              (spills = 62 reloads = 124)
1114           TOTAL                                   682.48u  19.61s  13.99g
1115    
1116    4000   CPS 100 spill                           2362.82u  56.28s  43.60g
1117           MLRISC ra                               4.96u  0.27s  2.72g
1118              (spills = 85 reloads = 170)
1119           TOTAL                                   2375.26u  57.21s  48.00g
1120    
1121    As you can see the old cps spill module suffers from some serious
1122    performance problem.  But since I cannot decipher the old code fully,
1123    instead of patching the problems up, I'm reimplementing it
1124    with a different algorithm.  The new code is more modular,
1125    smaller when compiled, and substantially faster
1126    (O(n log n) time and O(n) space).  Timing of the new spill module:
1127    
1128    4000  CPS 100 spill                           0.02u  0.00s  0.00g
1129          MLRISC ra                               0.25u  0.02s  0.15g
1130             (spills=1 reloads=3)
1131          TOTAL                                   7.74u  0.34s  1.62g
1132    
1133    Implementation details:
1134    
1135    As far as I can tell, the purpose of the CPS spill module is to make sure the
1136    number of live variables at any program point (the bandwidth)
1137    does not exceed a certain limit, which is determined by the
1138    size of the spill area.
1139    
1140    When the bandwidth is too large, we decrease the register pressure by
1141    packing live variables into spill records.  How we achieve this is
1142    completely different than what we did in the old code.
1143    
1144    First, there is something about the MLRiscGen code generator
1145    that we should be aware of:
1146    
1147    o MLRiscGen performs code motion!
1148    
1149       In particular, it will move floating point computations and
1150       address computations involving only the heap pointer to
1151       their use sites (if there is only a single use).
1152       What this means is that if we have a CPS record construction
1153       statement
1154    
1155           RECORD(k,vl,w,e)
1156    
1157       we should never count the new record address w as live if w
1158       has only one use (which is often the case).
1159    
1160       We should do something similar to floating point, but the transformation
1161       there is much more complex, so I won't deal with that.
1162    
1163    Secondly, there are now two new cps primops at our disposal:
1164    
1165     1. rawrecord of record_kind option
1166        This pure operator allocates some uninitialized storage from the heap.
1167        There are two forms:
1168    
1169         rawrecord NONE [INT n]  allocates a tagless record of length n
1170         rawrecord (SOME rk) [INT n] allocates a tagged record of length n
1171                                     and initializes the tag.
1172    
1173     2. rawupdate of cty
1174          rawupdate cty (v,i,x)
1175          Assigns to x to the ith component of record v.
1176          The storelist is not updated.
1177    
1178    We use these new primops for both spilling and increment record construction.
1179    
1180     1. Spilling.
1181    
1182        This is implemented with a linear scan algorithm (but generalized
1183        to trees).  The algorithm will create a single spill record at the
1184        beginning of the cps function and use rawupdate to spill to it,
1185        and SELECT or SELp to reload from it.  So both spills and reloads
1186        are fine-grain operations.  In contrast, in the old algorithm
1187        "spills" have to be bundled together in records.
1188    
1189        Ideally, we should sink the spill record construction to where
1190        it is needed.  We can even split the spill record into multiple ones
1191        at the places where they are needed.  But CPS is not a good
1192        representation for global code motion, so I'll keep it simple and
1193        am not attempting this.
1194    
1195     2. Incremental record construction (aka record splitting).
1196    
1197        Long records with many component values which are simulatenously live
1198        (recall that single use record addresses are not considered to
1199         be live) are constructed with rawrecord and rawupdate.
1200        We allocate space on the heap with rawrecord first, then gradually
1201        fill it in with rawupdate.  This is the technique suggested to me
1202        by Matthias.
1203    
1204        Some restrictions on when this is applicable:
1205        1. It is not a VECTOR record.  The code generator currently does not handle
1206           this case. VECTOR record uses double indirection like arrays.
1207        2. All the record component values are defined in the same "basic block"
1208           as the record constructor.  This is to prevent speculative
1209           record construction.
1210    
1211    ----------------------------------------------------------------------
1212    Name: Allen Leung
1213    Date: 2002/02/22 01:02:00 EST
1214    Tag: leunga-20020222-mlrisc-tools
1215    
1216    Minor bug fixes in the parser and rewriter
1217    
1218    ----------------------------------------------------------------------
1219    Name: Allen Leung
1220    Date: 2002/02/21 20:20:00 EST
1221    Tag: leunga-20020221-peephole
1222    
1223    Regenerated the peephole files.  Some contained typos in the specification
1224    and some didn't compile because of pretty printing bugs in the old version
1225    of 'nowhere'.
1226    
1227    ----------------------------------------------------------------------
1228    Name: Allen Leung
1229    Date: 2002/02/19 20:20:00 EST
1230    Tag: leunga-20020219-mlrisc-tools
1231    Description:
1232    
1233       Minor bug fixes to the mlrisc-tools library:
1234    
1235       1.  Fixed up parsing colon suffixed keywords
1236       2.  Added the ability to shut the error messages up
1237       3.  Reimplemented the pretty printer and fixed up/improved
1238           the pretty printing of handle and -> types.
1239       4.  Fixed up generation of literal symbols in the nowhere tool.
1240       5.  Added some SML keywords to to sml.sty
1241    
1242    ----------------------------------------------------------------------
1243    Name: Matthias Blume
1244    Date: 2002/02/19 16:20:00 EST
1245    Tag: blume-20020219-cmffi
1246    Description:
1247    
1248    A wild mix of changes, some minor, some major:
1249    
1250    * All C FFI-related libraries are now anchored under $c:
1251        $/c.cm      --> $c/c.cm
1252        $/c-int.cm  --> $c/internals/c-int.cm
1253        $/memory.cm --> $c/memory/memory.cm
1254    
1255    * "make" tool (in CM) now treats its argument pathname slightly
1256      differently:
1257        1. If the native expansion is an absolute name, then before invoking
1258           the "make" command on it, CM will apply OS.Path.mkRelative
1259           (with relativeTo = OS.FileSys.getDir()) to it.
1260        2. The argument will be passed through to subsequent phases of CM
1261           processing without "going native".  In particular, if the argument
1262           was an anchored path, then "make" will not lose track of that anchor.
1263    
1264    * Compiler backends now "know" their respective C calling conventions
1265      instead of having to be told about it by ml-nlffigen.  This relieves
1266      ml-nlffigen from one of its burdens.
1267    
1268    * The X86Backend has been split into X86CCallBackend and X86StdCallBackend.
1269    
1270    * Export C_DEBUG and C_Debug from $c/c.cm.
1271    
1272    * C type encoding in ml-nlffi-lib has been improved to model the conceptual
1273      subtyping relationship between incomplete pointers and their complete
1274      counterparts.  For this, ('t, 'c) ptr has been changed to 'o ptr --
1275      with the convention of instantiating 'o with ('t, 'c) obj whenever
1276      the pointer target type is complete.  In the incomplete case, 'o
1277      will be instantiated with some "'c iobj" -- a type obtained by
1278      using one of the functors PointerToIncompleteType or PointerToCompleteType.
1279    
1280      Operations that work on both incomplete and complete pointer types are
1281      typed as taking an 'o ptr while operations that require the target to
1282      be known are typed as taking some ('t, 'c) obj ptr.
1283    
1284      voidptr is now a bit "more concrete", namely "type voidptr = void ptr'"
1285      where void is an eqtype without any values.  This makes it possible
1286      to work on voidptr values using functions meant to operate on light
1287      incomplete pointers.
1288    
1289    * As a result of the above, signature POINTER_TO_INCOMPLETE_TYPE has
1290      been vastly simplified.
1291    
1292    ----------------------------------------------------------------------
1293    Name: Matthias Blume
1294    Date: 2002/02/19 10:48:00 EST
1295    Tag: blume-20020219-pqfix
1296    Description:
1297    
1298    Applied Chris Okasaki's bug fix for priority queues.
1299    
1300    ----------------------------------------------------------------------
1301    Name: Matthias Blume
1302    Date: 2002/02/15 17:05:00
1303    Tag: Release_110_39
1304    Description:
1305    
1306    Last-minute retagging is becoming a tradition... :-(
1307    
1308    This is the working release 110.39.
1309    
1310    ----------------------------------------------------------------------
1311    Name: Matthias Blume
1312    Date: 2002/02/15 16:00:00 EST
1313    Tag: Release_110_39-orig
1314    Description:
1315    
1316    Working release 110.39.  New bootfiles.
1317    
1318    (Update: There was a small bug in the installer so it wouldn't work
1319    with all shells.  So I retagged. -Matthias)
1320    
1321    ----------------------------------------------------------------------
1322    Name: Matthias Blume
1323    Date: 2002/02/15 14:17:00 EST
1324    Tag: blume-20020215-showbindings
1325    Description:
1326    
1327    Added EnvRef.listBoundSymbols and CM.State.showBindings.  Especially
1328    the latter can be useful for exploring what bindings are available at
1329    the interactive prompt.  (The first function returns only the list
1330    of symbols that are really bound, the second prints those but also the
1331    ones that CM's autoloading mechanism knows about.)
1332    
1333    ----------------------------------------------------------------------
1334    Name: Matthias Blume
1335    Date: 2002/02/15 12:08:00 EST
1336    Tag: blume-20020215-iptrs
1337    Description:
1338    
1339    Two improvements to ml-nlffigen:
1340    
1341      1. Write files only if they do not exist or if their current contents
1342         do not coincide with what's being written.  (That is, avoid messing
1343         with the time stamps unless absolutely necessary.)
1344    
1345      2. Implement a "repository" mechanism for generated files related
1346         to "incomplete pointer types".   See the README file for details.
1347    
1348    ----------------------------------------------------------------------
1349    Name: Matthias Blume
1350    Date: 2002/02/14 11:50:00 EST
1351    Tag: blume-20020214-quote
1352    Description:
1353    
1354    Added a type 't t_' to tag.sml (in ml-nlffi-lib.cm).  This is required
1355    because of the new and improved tag generation scheme.  (Thanks to Allen
1356    Leung for pointing it out.)
1357    
1358    ----------------------------------------------------------------------
1359    Name: Lal George
1360    Date: 2002/02/14 09:55:27 EST 2002
1361    Tag: george-20020214-isabelle-bug
1362    Description:
1363    
1364    Fixed the MLRISC bug sent by Markus Wenzel regarding the compilation
1365    of Isabelle on the x86.
1366    
1367    From Allen:
1368    -----------
1369     I've found the problem:
1370    
1371         in ra-core.sml, I use the counter "blocked" to keep track of the
1372         true number of elements in the freeze queue.  When the counter goes
1373         to zero, I skip examining the queue.  But I've messed up the
1374         bookkeeping in combine():
1375    
1376             else ();
1377             case !ucol of
1378               PSEUDO => (if !cntv > 0 then
1379                     (if !cntu > 0 then blocked := !blocked - 1 else ();
1380                                        ^^^^^^^^^^^^^^^^^^^^^^^
1381                      moveu := mergeMoveList(!movev, !moveu)
1382                     )
1383                  else ();
1384    
1385         combine() is called to coalesce two nodes u and v.
1386         I think I was thinking that if the move counts of u and v are both
1387         greater than zero then after they are coalesced then one node is
1388         removed from the freeze queue.  Apparently I was thinking that
1389         both u and v are of low degree, but that's clearly not necessarily true.
1390    
1391    
1392    02/12/2002:
1393        Here's the patch.  HOL now compiles.
1394    
1395        I don't know how this impact on performance (compile
1396        time or runtime).  This bug caused the RA (especially on the x86)
1397        to go thru the potential spill phase when there are still nodes on the
1398        freeze queue.
1399    
1400    
1401    
1402    
1403    ----------------------------------------------------------------------
1404    Name: Matthias Blume
1405    Date: 2002/02/13 22:40:00 EST
1406    Tag: blume-20020213-fptr-rtti
1407    Description:
1408    
1409    Fixed a bug in ml-nlffigen that was introduced with one of the previous
1410    updates.
1411    
1412    ----------------------------------------------------------------------
1413    Name: Matthias Blume
1414    Date: 2002/02/13 16:41:00 EST
1415    Tag: blume-20020213-cmlpq
1416    Description:
1417    
1418    Added new priority queue export symbols (which have just been added to
1419    smlnj-lib.cm) to CML's version of smlnj-lib.cm.  (Otherwise CML would
1420    not compile and the installer would choke.)
1421    
1422    ----------------------------------------------------------------------
1423    Name: Matthias Blume
1424    Date: 2002/02/13 16:15:00 EST
1425    Tag: blume-20020213-various
1426    Description:
1427    
1428    1. More tweaks to ml-nlffigen:
1429    
1430       - better internal datastructures (resulting in slight speedup)
1431       - "-match" option requires exact match
1432       - "localized" gensym counters (untagged structs/unions nested within
1433         other structs/unions or within typedefs get a fresh counter; their
1434         tag will be prefixed by a concatenation of their parents' tags)
1435       - bug fixes (related to calculation of transitive closure of types
1436         to be included in the output)
1437    
1438    2. Minor Basis updates:
1439    
1440       - added implementations for List.collate and Option.app
1441    
1442    ----------------------------------------------------------------------
1443    Name: Matthias Blume
1444    Date: 2002/02/11 15:55:00 EST
1445    Tag: blume-20020211-gensym
1446    Description:
1447    
1448    Added a "-gensym" option to command line of ml-nlffigen.  This can be
1449    used to specify a "stem" -- a string that is inserted in all "gensym'd"
1450    names (ML structure names that correspond to unnamed C structs, unions,
1451    and enums), so that separate runs of ml-nlffigen do not clash.
1452    
1453    ----------------------------------------------------------------------
1454    Name: Matthias Blume
1455    Date: 2002/02/11 12:05:00 EST
1456    Tag: blume-20020211-gensml
1457    Description:
1458    
1459    A quick fix for a problem with GenSML (in the pgraph-util library):
1460    Make generation of toplevel "local" optional.  (Strictly speaking,
1461    signature definitions within "local" are not legal SML.)
1462    
1463    Other than that: updates to INSTALL and cm/TODO.
1464    
1465    ----------------------------------------------------------------------
1466    Name: Matthias Blume
1467    Date: 2002/02/08 15:00:00 EST
1468    Tag: blume-20020208-uniquepid
1469    Description:
1470    
1471    0. Version number has been bumped to 110.38.1.  NEW BOOTFILES!!!
1472    
1473    1. The installer (config/install.sh) has gotten smarter:
1474    
1475         - Configuration options are a bit easier to specify now
1476           (in config/targets).
1477         - Bug in recognizing .tar.bz2 files fixed.
1478         - Installer automatically resolves dependencies between
1479           configuration options (e.g., if you ask for eXene, you will
1480           also get cml -- regardless whether you asked for it or not).
1481         - Installer can run in "quieter mode" by setting the environment
1482           variable INSTALL_QUIETLY to "true".  "Quieter" does not mean
1483           "completely silent", though.
1484         - Build HashCons library as part of smlnj-lib.
1485    
1486    2. A new scheme for assigning persistent identifiers to compilation
1487       units (and, by extension, to types etc.) has been put into place.
1488       This fixes a long-standing bug where types and even dynamic values
1489       can get internally confused, thereby compromising type safety
1490       (abstraction) and dynamic correctness.  See
1491    
1492         http://cm.bell-labs.com/cm/cs/who/blume/pid-confusion.tgz
1493    
1494       for an example of how things could go wrong until now.
1495    
1496       The downside of the new scheme is that pids are not quite as
1497       persistent as they used to be: CM will generate a fresh pid
1498       for every compilation unit that it thinks it sees for the first
1499       time.  That means that if you compile starting from a clean, fresh
1500       source tree at two different times, you end up with different
1501       binaries.
1502    
1503       Cutoff recompilation, however, has not been compromised because
1504       CM keeps pid information in special caches between runs.
1505    
1506    ----------------------------------------------------------------------
1507    Name: Lal George
1508    Date: 2002/02/07 15:34:13 EST 2002
1509    Tag: <none>
1510    Description:
1511    
1512    Compilers that generate assembly code may produce  global labels
1513    whose value is resolved at link time. The various peephole optimization
1514    modules did not take this in account.
1515    
1516    TODO. The Labels.addrOf function should really return an option
1517    type so that clients are forced to deal with this issue, rather
1518    than an exception being raised.
1519    
1520    ----------------------------------------------------------------------
1521    Name: Lal George
1522    Date: 2002/02/06 13:55:02 EST
1523    Tag: george-20020206-ra-breakup
1524    Description:
1525    
1526    1. A bug fix from Allen.
1527    
1528        A typo causes extra fstp %st(0)'s to be generated at compensation
1529        edges, which might cause stack underflow traps at runtime.  This
1530        occurs in fft where there are extraneous fstps right before the 'into'
1531        trap instruction (in this case they are harmless since none of the
1532        integers overflow.)
1533    
1534    2. Pulled out various utility modules that were embedded in the modules
1535       of the register allocator. I need these modules for other purposes, but
1536       they are not complete enough to put into a library (just yet).
1537    ----------------------------------------------------------------------
1538    Name: Matthias Blume
1539    Date: 2002/01/31 16:05:00 EST
1540    Tag: blume-20020131-sparc-ccalls
1541    Description:
1542    
1543    1. C-calls on Sparc needlessly allocated a huge chunk (96 bytes)
1544       of extra stack space by mistake.  Fixed.
1545    
1546    2. Bug in logic of handling of command-line options in ml-nlffigen fixed.
1547    
1548    ----------------------------------------------------------------------
1549    Name: Allen Leung
1550    Date: 2002/01/30
1551    Tag: leunga-20020130-nowhere-bug-fix
1552    Description:
1553    
1554       MLRISC bug fixes:
1555       1. Fixed a bindings computation bug in the 'nowhere' program generator tool.
1556       2. MachineInt.fromString was negating its value.
1557    
1558    ----------------------------------------------------------------------
1559    Name: Matthias Blume
1560    Date: 2002/01/29
1561    Tag: blume-20020129-INSTALL
1562    Description:
1563    
1564    - Added somewhat detailed installation instructions (file INSTALL).
1565    - Fixed curl-detection bug in config/install.sh.
1566    - It is now possible to select the URL getter using the URLGETTER
1567      environment variable:
1568    
1569          not set / "unknown"      --> automatic detection (script tries wget,
1570                                       curl, and lynx)
1571          "wget" / "curl" / "lynx" --> use the specified program (script "knows"
1572                                       how to properly invoke them)
1573          other                    --> use $URLGETTER directly, it must take
1574                                       precisely two command-line arguments
1575                                       (source URL and destination file name)
1576    
1577    ----------------------------------------------------------------------
1578    Name: Matthias Blume
1579    Date: 2002/01/28
1580    Tag: blume-20020128-sparc-ccalls
1581    Description:
1582    
1583    - Fixed problem with calculation of "used" registers in sparc-c-calls.
1584    - Make use of the allocParam argument in sparc-c-calls.
1585    
1586    ----------------------------------------------------------------------
1587    Name: Matthias Blume
1588    Date: 2002/01/28
1589    Tag: blume-20020128-allocParam
1590    Description:
1591    
1592    John Reppy:  Changes c-calls API to accept client-callback for
1593    allocating extra stack space.
1594    me: Corresponding changes to mlriscGen (using a dummy argument that
1595        does not change the current behavior).
1596    
1597    ----------------------------------------------------------------------
1598    Name: Matthias Blume
1599    Date: 2002/01/28 12:00:00
1600    Tag: Release_110_38
1601    Description:
1602    
1603    This time for real!!!
1604    
1605    ----------------------------------------------------------------------
1606    Name: Matthias Blume
1607    Date: 2002/01/28 10:56:00 EST
1608    Tag: blume-20020128-retraction
1609    Description:
1610    
1611    0. Retracted earlier 110.38.  (The Release_110_38 tag has been replaced
1612       with blume-Release_110_38-retracted.)
1613    
1614    1. Fixed a problem with incorrect rounding modes in real64.sml.
1615       (Thanks to Andrew Mccreight <andrew.mccreight@yale.edu>.)
1616    
1617    2. A bug in ml-nlffigen related to the handling of unnamed structs, unions,
1618       and enums fixed.  The naming of corresponding ML identifiers should
1619       now be consistent again.
1620    
1621    ----------------------------------------------------------------------
1622    Name: Allen Leung
1623    Date: 2002/01/27
1624    Tag: leunga-20020127-nowhere
1625    Description:
1626    
1627       Added a target called nowhere in the configuration scripts.
1628       Enabling this will build the MLRISC 'nowhere' tool (for translating
1629       programs with where-clauses into legal SML code) during installation.
1630    
1631    ----------------------------------------------------------------------
1632    Name: Matthias Blume
1633    Date: 2002/01/25 21:27:00 EST
1634    Tag: blume-Release_110_38-retracted
1635    Description:
1636    
1637    Call it a (working) release!  Version is 110.38. Bootfiles are ready.
1638    
1639    README will be added later.
1640    
1641    !!! NOTE:  Re-tagged as blume-Release_110_38-retracted. Original tag
1642    (Release_110_38) removed.  Reason: Last-minute bug fixes.
1643    
1644    ----------------------------------------------------------------------
1645    Name: Matthias Blume
1646    Date: 2002/01/25
1647    Tag: blume-20020125-ffi
1648    Description:
1649    
1650    A large number of tweaks and improvements to ml-nlffi-lib and
1651    ml-nlffigen:
1652    
1653       - ML represenation types have been streamlined
1654       - getter and setter functions work with concrete values, not abstract
1655         ones where possible
1656       - ml-nlffigen command line more flexible (see README file there)
1657       - some bugs have been fixed (hopefully)
1658    
1659    ----------------------------------------------------------------------
1660    Name: Lal George
1661    Date: 2002/01/24
1662    Tag: george-20020124-risc-ra-interface
1663    Description:
1664    
1665       There is a dramatic simplification in the interface to the
1666       register allocator for RISC architectures as a result of making
1667       parallel copy instructions explicit.
1668    
1669    ----------------------------------------------------------------------
1670    Name: Matthias Blume
1671    Date: 2002/01/22
1672    Tag: blume-20020122-x86-ccalls
1673    Description:
1674    
1675    Bug fix for c-calls on x86 (having to do with how char- and
1676    short-arguments are being handled).
1677    
1678    ----------------------------------------------------------------------
1679    Name: Matthias Blume
1680    Date: 2002/01/21
1681    Tag: blume-20020121-ff
1682    Description:
1683    
1684    Another day of fiddling with the FFI...
1685    
1686    1. Bug fix/workaround:  CKIT does not complain about negative array
1687       dimensions, so ml-nlffigen has to guard itself against this possibility.
1688       (Otherwise a negative dimension would send it into an infinite loop.)
1689    
1690    2. Some of the abstract types (light objects, light pointers, most "base"
1691       types) in structure C are now eqtypes.
1692    
1693    3. Added constructors and test functions for NULL function pointers.
1694    
1695    ----------------------------------------------------------------------
1696    Name: Matthias Blume
1697    Date: 2002/01/18
1698    Tag: blume-20020118-ready-for-new-release
1699    Description:
1700    
1701    Made config/srcarchiveurl point to a new place.  (Will provide boot
1702    files shortly.)
1703    
1704    Maybe we christen this to be 110.38?
1705    
1706    ----------------------------------------------------------------------
1707    Name: Matthias Blume
1708    Date: 2002/01/18
1709    Tag: blume-20020118-more-ffifiddle
1710    Description:
1711    
1712    Today's FFI fiddling:
1713    
1714      - Provided a structure CGetSet with "convenient" versions of C.Get.* and
1715        C.Set.* that use concrete (MLRep.*) arguments and results instead
1716        of abstract ones.
1717    
1718      - Provided word-style bit operations etc. for "int" representation
1719        types in MLRep.S<Foo>Bitops where <Foo> ranges over Char, Int, Short,
1720        and Long.
1721    
1722    ----------------------------------------------------------------------
1723    Name: Matthias Blume
1724    Date: 2002/01/18
1725    Tag: blume-20020118-use-x86-fp
1726    Description:
1727    
1728    Now that x86-fast-fp seems to be working, I turned it back on again
1729    by default.  (Seems to work fine now, even with the FFI.)
1730    
1731    Other than that, I added some documentation about the FFI to
1732    src/ml-nlffigen/README and updated the FFI test examples in
1733    src/ml-nlffi-lib/Tests/*.
1734    
1735    ----------------------------------------------------------------------
1736    Name: Allen Leung
1737    Date: 2002/01/17
1738    Tag: leunga-20020117-x86-fast-fp-call
1739    Description:
1740    
1741       1. Fixed a problem with handling return fp values when x86's fast fp
1742          mode is turned on.
1743    
1744       2. Minor pretty printing fix for cellset.  Print %st(0) as %st(0) instead
1745          of %f32.
1746    
1747       3. Added a constructor INT32lit to the ast of MLRISC tools.
1748    
1749    ----------------------------------------------------------------------
1750    Name: Matthias Blume
1751    Date: 2002/01/16
1752    Tag: blume-20020116-ffifiddle
1753    Description:
1754    
1755    More fiddling with the FFI interface:
1756    
1757     - Make constness 'c instead of rw wherever possible.  This eliminates
1758       the need for certain explicit coercions.  (However, due to ML's
1759       value polymorphism, there will still be many cases where explicit
1760       coercions are necessary.  Phantom types are not the whole answer
1761       to modeling a subtyping relationship in ML.)
1762    
1763     - ro/rw coersions for pointers added.  (Avoids the detour through */&.)
1764    
1765     - "printf" test example added to src/ml-nlffi-lib/Tests.  (Demonstrates
1766       clumsy workaround for varargs problem.)
1767    
1768    ----------------------------------------------------------------------
1769    Name: Lal George
1770    Date: 2002/01/15
1771    Tag: <none>
1772    Description:
1773    
1774    1. Since COPY instructions are no longer native to the architecture,
1775       a generic functor can be used to implement the expandCopies function.
1776    
1777    2. Allowed EXPORT and IMPORT pseudo-op declarations to appear inside a
1778       TEXT segment.
1779    
1780    ----------------------------------------------------------------------
1781    Name: Matthias Blume
1782    Date: 2002/01/15
1783    Tag: blume-20020115-ffiupdates
1784    Description:
1785    
1786    1. Fix for bug resulting in single-precision float values being returned
1787       incorrectly from FFI calls.
1788    
1789    2. Small modifications to C FFI API:
1790    
1791        - memory-allocation routines return straight objects (no options)
1792          and raise an exception in out-of-memory situations
1793        - unsafe extensions to cast between function pointers and pointers
1794          from/to ints
1795        - added structure C_Debug as an alternative to structure C where
1796          pointer-dereferencing (|*| and |*!) always check for null-pointers
1797        - added open_lib' to DynLinkage;  open_lib' works like open_lib
1798          but also takes a (possibly empty) list of existing library handles
1799          that the current library depends on
1800    
1801    ----------------------------------------------------------------------
1802    Name: Matthias Blume
1803    Date: 2002/01/10
1804    Tag: blume-20020110-newffigen
1805    Description:
1806    
1807    1. Updates to portable graph code.
1808    
1809    2. Major update to ml-nlffigen and ml-nlffi-lib.  Things are much
1810       more scalable now so that even huge interfaces such as the one
1811       for GTK compile in finite time and space. :-)
1812       See src/ml-nlffigen/README for details on what's new.
1813    
1814    ----------------------------------------------------------------------
1815    Name: Lal George
1816    Date: 2001/01/09 14:31:35 EST 2002
1817    Tag: george-20011206-rm-native-copy
1818    Description:
1819    
1820            Removed the native COPY and FCOPY instructions
1821            from all the architectures and replaced it with the
1822            explicit COPY instruction from the previous commit.
1823    
1824            It is now possible to simplify many of the optimizations
1825            modules that manipulate copies. This has not been
1826            done in this change.
1827    
1828    ----------------------------------------------------------------------
1829    Name: Lal George
1830    Date: 2001/12/06 16:50:13 EST 2001
1831    Tag: george-20011206-mlrisc-instruction
1832    Description:
1833    
1834    Changed the representation of instructions from being fully abstract
1835    to being partially concrete. That is to say:
1836    
1837      from
1838            type instruction
1839    
1840      to
1841            type instr                              (* machine instruction *)
1842    
1843            datatype instruction =
1844                LIVE of {regs: C.cellset, spilled: C.cellset}
1845              | KILL of {regs: C.cellset, spilled: C.cellset}
1846              | COPYXXX of {k: CB.cellkind, dst: CB.cell list, src: CB.cell list}
1847              | ANNOTATION of {i: instruction, a: Annotations.annotation}
1848              | INSTR of instr
1849    
1850    This makes the handling of certain special instructions that appear on
1851    all architectures easier and uniform.
1852    
1853    LIVE and KILL say that a list of registers are live or killed at the
1854    program point where they appear. No spill code is generated when an
1855    element of the 'regs' field is spilled, but the register is moved to
1856    the 'spilled' (which is present, more for debugging than anything else).
1857    
1858    LIVE replaces the (now deprecated) DEFFREG instruction on the alpha.
1859    We used to generate:
1860    
1861            DEFFREG f1
1862            f1 := f2 + f3
1863            trapb
1864    
1865    but now generate:
1866    
1867            f1 := f2 + f3
1868            trapb
1869            LIVE {regs=[f1,f2,f3], spilled=[]}
1870    
1871    Furthermore, the DEFFREG (hack) required that all floating point instruction
1872    use all registers mentioned in the instruction. Therefore f1 := f2 + f3,
1873    defines f1 and uses [f1,f2,f3]! This hack is no longer required resulting
1874    in a cleaner alpha implementation. (Hopefully, intel will not get rid of
1875    this architecture).
1876    
1877    COPYXXX is intended to replace the parallel COPY and FCOPY  available on
1878    all the architectures. This will result in further simplification of the
1879    register allocator that must be aware of them for coalescing purposes, and
1880    will also simplify certain aspects of the machine description that provides
1881    callbacks related to parallel copies.
1882    
1883    ANNOTATION should be obvious, and now INSTR represents the honest to God
1884    machine instruction set!
1885    
1886    The <arch>/instructions/<arch>Instr.sml files define certain utility
1887    functions for making porting easier -- essentially converting upper case
1888    to lower case. All machine instructions (of type instr) are in upper case,
1889    and the lower case form generates an MLRISC instruction. For example on
1890    the alpha we have:
1891    
1892      datatype instr =
1893         LDA of {r:cell, b:cell, d:operand}
1894       | ...
1895    
1896      val lda : {r:cell, b:cell, d:operand} -> instruction
1897        ...
1898    
1899    where lda is just (INSTR o LDA), etc.
1900    
1901    ----------------------------------------------------------------------
1902    Name: Matthias Blume
1903    Date: 2001/11/22 21:40:00 EST
1904    Tag: Release_110_37
1905    Description:
1906    
1907    Release 110.37.  This time for real.
1908    
1909    ----------------------------------------------------------------------
1910    Name: Matthias Blume
1911    Date: 2001/11/21 16:35:00 EST
1912    Tag: blume-20011121-foot-in-mouth
1913    Description:
1914    
1915    Removed the "Release_110_37" tag because of a serious bug.
1916    This will be re-tagged once the bug is fixed.
1917    
1918    ----------------------------------------------------------------------
1919    Name: Matthias Blume
1920    Date: 2001/11/21 16:14:00 EST
1921    Tag: blume-20011121-forgottenfile
1922    Description:
1923    
1924    Forgot to add a file.  (Just a .tex-file -- part of
1925    the CM manual source.)
1926    
1927    ----------------------------------------------------------------------
1928    Name: Matthias Blume
1929    Date: 2001/11/21 16:10:00 EST
1930    Tag: blume-20011121-invalid_110_37
1931    Description:
1932    
1933    Note: I removed the original tag "Release_110_37" from this commit
1934          because we found a serious bug in all non-x86 backends.
1935          - Matthias
1936    
1937    1. Modifications to the SML/NJ code generator and to the runtime system
1938       so that code object name strings are directly inserted into code
1939       objects at code generation time.  The only business the runtime system
1940       has with this is now to read the name strings on occasions.
1941       (The encoding of the name string has also changed somewhat.)
1942    
1943    2. CM now implements a simple "set calculus" for specifying export lists.
1944       In particular, it is now possible to refer to the export lists of
1945       other libraries/groups/sources and form unions as well as differences.
1946       See the latest CM manual for details.
1947    
1948    3. An separate notion of "proxy" libraries has again be eliminated from
1949       CM's model.  (Proxy libraries are now simply a special case of using
1950       the export list calculus.)
1951    
1952    4. Some of the existing libraries now take advantage of the new set
1953       calculus.
1954       (Notice that not all libraries have been converted because some
1955       of the existing .cm-files are supposed to be backward compatible
1956       with 110.0.x.)
1957    
1958    5. Some cleanup in stand-alone programs.  (Don't use "exnMessage" -- use
1959       "General.exnMessage"!  The former relies on a certain hook to be
1960       initialized, and that often does not happen in the stand-alone case.)
1961    
1962    ----------------------------------------------------------------------
1963    Name: Lal George
1964    Date: 2001/11/21  13:56:18 EST
1965    Tag: george-2001121-pseudo-ops
1966    Description:
1967    
1968      Implemented a complete redesign of MLRISC pseudo-ops. Now there
1969      ought to never be any question of incompatabilities with
1970      pseudo-op syntax expected by host assemblers.
1971    
1972      For now, only modules supporting GAS syntax are implemented
1973      but more should follow, such as MASM, and vendor assembler
1974      syntax, e.g. IBM as, Sun as, etc.
1975    
1976    ----------------------------------------------------------------------
1977    Name: Matthias Blume
1978    Date: 2001/11/14 11:52:00 EST
1979    Tag: blume-20011114-srcname
1980    Description:
1981    
1982    1. Routed the name of the current source file to mlriscgen where it
1983       should be directly emitted into the code object.  (This last part
1984       is yet to be done.)
1985    
1986    2. Some cleanup of the pgraph code to make it match the proposal that
1987       I put out the other day.  (The proposal notwithstanding, things are
1988       still in flux here.)
1989    
1990    ----------------------------------------------------------------------
1991    Name: Lal George
1992    Date: 2001/11/14 09:44:04 EST
1993    Tag:
1994    Description:
1995    
1996      Fix for a backpatching bug reported by Allen.
1997    
1998      Because the boundary between short and long span-dependent
1999      instructions is +/- 128, there are an astounding number of
2000      span-dependent instructions whose size is over estimated.
2001    
2002      Allen came up with the idea of letting the size of span
2003      dependent instructions be non-monotonic, for a maxIter
2004      number of times, after which the size must be monotonically
2005      increasing.
2006    
2007      This table shows the number of span-dependent instructions
2008      whose size was over-estimated as a function of maxIter, for the
2009      file Parse/parse/ml.grm.sml:
2010    
2011         maxIter            # of instructions:
2012            10                      687
2013            20                      438
2014            30                      198
2015            40                        0
2016    
2017      In compiling the compiler, there is no significant difference in
2018      compilation speed between maxIter=10 and maxIter=40. Actually,
2019      my measurements showed that maxIter=40 was a tad faster than
2020      maxIter=10! Also 96% of the  files in the compiler reach a fix
2021      point within 13 iterations, so fixing maxIter at 40, while high,
2022      is okay.
2023    
2024    ----------------------------------------------------------------------
2025    Name: Matthias Blume
2026    Date: 2001/10/31 15:25:00 EST
2027    Tag: blume-20011031-pgraph
2028    Description:
2029    
2030    CKIT:
2031    * Changed the "Function" constructor of type Ast.ctype to carry optional
2032      argument identifiers.
2033    * Changed the return type of TypeUtil.getFunction accordingly.
2034    * Type equality ignores the argument names.
2035    * TypeUtil.composite tries to preserve argument names but gives up quickly
2036      if there is a mismatch.
2037    
2038    installation script:
2039    * attempts to use "curl" if available (unless "wget" is available as well)
2040    
2041    CM:
2042    * has an experimental implementation of "portable graphs" which I will
2043      soon propose as an implementation-independent library format
2044    * there are also new libraries $/pgraph.cm and $/pgraph-util.cm
2045    
2046    NLFFI-LIB:
2047    * some cleanup (all cosmetic)
2048    
2049    NLFFIGEN:
2050    * temporarily disabled the mechanism that suppresses ML output for
2051      C definitions whose identifiers start with an underscore character
2052    * generate val bindings for enum constants
2053    * user can request that only one style (light or heavy) is being used;
2054      default is to use both (command-line arguments: -heavy and -light)
2055    * fixed bug in handling of function types involving incomplete pointers
2056    * generate ML entry points that take record arguments (i.e., using
2057      named arguments) for C functions that have a prototype with named
2058      arguments
2059      (see changes to CKIT)
2060    
2061    ----------------------------------------------------------------------
2062    Name: Allen Leung
2063    Date: 2001/10/27 20:34:00 EDT
2064    Tag: leunga-20011027-x86-fast-fp-call
2065    Description:
2066    
2067       Fixed the bug described in blume-20010920-slowfp.
2068    
2069       The fix involves
2070          1. generating FCOPYs in FSTP in ia32-svid
2071          2. marking a CALL with the appropriate annotation
2072    
2073    ----------------------------------------------------------------------
2074    Name: Matthias Blume
2075    Date: 2001/10/16 11:32:00 EDT
2076    Tag: blume-20011016-netbsd
2077    Description:
2078    
2079    Underscore patch from Chris Richards (fixing problem with compiling
2080    runtime system under recent NetBSD).
2081    
2082    ----------------------------------------------------------------------
2083    Name: Allen Leung
2084    Date: 2001/10/12 17:18:32 EDT 2001
2085    Tag: leung-20011012-x86-printflowgraph
2086    Description:
2087    
2088    X86RA now uses a valid (instead of dummy) PrintFlowgraph module.
2089    
2090    ----------------------------------------------------------------------
2091    Name: Lal George
2092    Date: 2001/10/11 23:51:34 EDT
2093    Tag: george-20011011-too-many-instrs
2094    Description:
2095    
2096    The representation of a program point never expected to see more
2097    than 65536 instructions in a basic block!
2098    
2099    ----------------------------------------------------------------------
2100    Name: Lal George
2101    Date: 2001/10/09 09:41:37 EDT
2102    Tag: george-20011008-mlrisc-labels
2103    Description:
2104    
2105    Changed the machine description files to support printing of
2106    local and global labels in assembly code, based on host assembler
2107    conventions.
2108    
2109    ----------------------------------------------------------------------
2110    Name: Matthias Blume
2111    Date: 2001/09/25 15:25:00 EDT
2112    Tag: blume-20010925-exninfo
2113    Description:
2114    
2115    I provided a non-hook implementation of exnName (at the toplevel) and
2116    made the "dummy" implementation of exnMessage (at the toplevel) more
2117    useful: if nothing gets "hooked in", then at least you are going to
2118    see the exception name and a message indicating why you don't see more.
2119    
2120    [For the time being, programs that need exnMessage and want to use
2121    ml-build should either use General.exnMessage (strongly recommended) or
2122    refer to structure General at some other point so that CM sees a
2123    static dependency.]
2124    
2125    [Similar remarks go for "print" and "use":  If you want to use their
2126    functionality in stand-alone programs generated by ml-build, then use
2127    TextIO.output and Backend.Interact.useFile (from $smlnj/compiler.cm).]
2128    
2129    ----------------------------------------------------------------------
2130    Name: Matthias Blume
2131    Date: 2001/09/20 17:28:00 EDT
2132    Tag: blume-20010920-slowfp
2133    Description:
2134    
2135    Allen says that x86-fast-fp is not safe yet, so I turned it off again...
2136    
2137    ----------------------------------------------------------------------
2138    Name: Matthias Blume
2139    Date: 2001/09/20 17:20:00 EDT
2140    Tag: blume-20010920-canonicalpaths
2141    Description:
2142    
2143    0. Updated the BOOT file (something that I forgot to do earlier).
2144    
2145    1. Small internal change to CM so that it avoids "/../" in filenames
2146       as much as possible (but only where it is safe).
2147    
2148    2. Changed config/_run-sml (resulting in a changed bin/.run-sml) so
2149       that arguments that contain delimiters are passed through correctly.
2150       This change also means that all "special" arguments of the form
2151       @SMLxxx... must come first.
2152    
2153    3. Changed install script to put relative anchor names for tool commands
2154       into pathconfig.
2155    
2156    ----------------------------------------------------------------------
2157    Name: Matthias Blume
2158    Date: 2001/09/18 15:35:00 EDT
2159    Tag: blume-20010918-readme11036
2160    Description:
2161    
2162    Added README files.
2163    
2164    ----------------------------------------------------------------------
2165    Name: Matthias Blume
2166    Date: 2001/09/18 11:45:00 EDT
2167    Tag: Release_110_36 (retag)
2168    Description:
2169    
2170    Fixed mistake in config/preloads. Retagged as 110.36.
2171    
2172    ----------------------------------------------------------------------
2173    Name: Matthias Blume
2174    Date: 2001/09/18 09:40:00 EDT
2175    Tag: Release_110_36_orig (tag changed)
2176    Description:
2177    
2178    New version (110.36).  New bootfiles.
2179    
2180    ----------------------------------------------------------------------
2181    Name: Matthias Blume
2182  Date: 2001/09/14 16:15:00 EDT  Date: 2001/09/14 16:15:00 EDT
2183  Tag: blume-20010914-x86fastfp  Tag: blume-20010914-x86fastfp
2184  Description:  Description:

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