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Diff of /sml/trunk/NOTES/HISTORY

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revision 1133, Tue Mar 12 03:56:23 2002 UTC revision 1294, Thu Dec 12 21:22:48 2002 UTC
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13  Description:  Description:
14    
15  ----------------------------------------------------------------------  ----------------------------------------------------------------------
16    Name: Matthias Blume
17    Date: 2002/12/12 16:25:00 EST
18    Tag: blume-20021212-risc-ra
19    Description:
20    
21    Fixed a serious bug in the rewrite code for FP spilling/reloading that
22    sent the RA into an infinite loop when floating point registers get
23    spilled.  (Because of this bug, e.g., nucleic stopped compiling between
24    110.37 and 110.38.)
25    There was another set of potential problems related to the handling of
26    MLRISC annotations (but those did not yet cause real problems, apparently).
27    
28    ----------------------------------------------------------------------
29    Name: Matthias Blume
30    Date: 2002/12/06 22:40:00 EST
31    Tag: blume-20021206-cm-fileid
32    Description:
33    
34    Added a call of SrcPath.sync at the beginning of Parse.parse (in CM).
35    This fixes the problem of CM getting confused by files that suddenly
36    change their identity (e.g., by getting unlinked and recreated by some
37    text editor such as vi).  There might be a better/cheaper/cleaner way
38    of doing this, but for now this will have to do.
39    
40    ----------------------------------------------------------------------
41    Name: Matthias Blume
42    Date: 2002/10/28 09:50:00 EST
43    Tag: blume-20021028-typecheck
44    Description:
45    
46    Exported structure Typecheck from $smlnj/viscomp/core.cm.
47    
48    ----------------------------------------------------------------------
49    Name: Matthias Blume
50    Date: 2002/10/17 09:10:00 EDT
51    Tag: Release_110_42
52    Description:
53    
54    In good old tradition, there has been a slight hiccup so that we have
55    to patch 110.42 after the fact.   The old release tag has been replaced
56    (see below).
57    
58    The change solves a problem with two competing approaches the
59    configuration problem regarding MacOS 10.1 vs. MacOS 10.2 which got in
60    each other's way.
61    
62    This change only affects the runtime system code and the installer script.
63    (No new bootfiles.)
64    
65    ----------------------------------------------------------------------
66    Name: Matthias Blume
67    Date: 2002/10/16 12:00:00 EDT
68    Tag: Release_110_42_removed
69    Description:
70    
71    New working release.  New bootfiles.
72    
73    ----------------------------------------------------------------------
74    Name: Matthias Blume
75    Date: 2002/10/10 13:10:00 EDT
76    Tag: blume-20021010-ppc-divs
77    Description:
78    
79    The mltree operator DIVS must be implemented with an overflow check on
80    the PPC because the hardware indicates divide-by-zero using "overflow" as
81    well.
82    
83    ----------------------------------------------------------------------
84    Name: Matthias Blume
85    Date: 2002/07/23 11:45:00
86    Tag: blume-20020723-smlnj-home
87    Description:
88    
89    Sml now senses the SMLNJ_HOME environment variable.  If this is set,
90    then the bin dir is assumed to be in $SMLNJ_HOME/bin and (unless
91    CM_PATHCONFIG is also set), the path configuration file is assumed
92    to be in $SMLNJ_HOME/lib/pathconfig.  This way one can easily move
93    the entire tree to some other place and everything will "just work".
94    
95    (Companion commands such as ml-build and ml-makedepend also sense this
96    variable.)
97    
98    ----------------------------------------------------------------------
99    Name: Matthias Blume
100    Date: 2002/07/12 21:19:00 EDT
101    Tag: blume-20020712-liveness
102    Description:
103    
104    Exported two useful "step" functions from liveness module (MLRISC).
105    
106    ----------------------------------------------------------------------
107    Name: Matthias Blume
108    Date: 2002/07/05 16:00 EDT
109    Tag: Release_110_41
110    Description:
111    
112    New working release.  New bootfiles.
113    
114    ----------------------------------------------------------------------
115    Name: Matthias Blume
116    Date: 2002/07/05 10:25:00 EDT
117    Tag: blume-20020705-btimp
118    Description:
119    
120    Exported structure BTImp from $smlnj/viscomp/debugprof.cm so that
121    other clients can set up backtracing support.
122    
123    ----------------------------------------------------------------------
124    Name: Matthias Blume
125    Date: 2002/06/25 17:23:00 EDT
126    Tag: blume-20020625-fpmax
127    Description:
128    
129    Fixed a bug in translation of INLMAX (and INLMIN) for the floating-point
130    case.  (The sense of the isNaN test was reversed -- which made min and
131    max always return their first argument.)
132    
133    ----------------------------------------------------------------------
134    Name: Matthias Blume
135    Date: 2002/06/11
136    Tag: blume-20020611-unixpath
137    Description:
138    
139    Back-ported OS.Path.{from,to}UnixPath from idlbasis-devel branch.
140    
141    ----------------------------------------------------------------------
142    Name: Matthias Blume
143    Date: 2002/06/10 16:35:00 EDT
144    Tag: blume-20020610-ieeereal
145    Description:
146    
147    I back-ported my implementation of IEEEReal.fromString from the
148    idlbasis-devel branch so that we can test it.
149    
150    Another small change is that ppDec tries to give more information
151    than just "<sig>" in the case of functors.  However, this code is
152    broken in some mysterious way if the functor's body's signature
153    has not been declared by ascription but gets inferred from the
154    implementation.  This needs fixing...
155    
156    ----------------------------------------------------------------------
157    Name: Matthias Blume
158    Date: 2002/05/31
159    Tag: blume-20020531-btrace-mode
160    Description:
161    
162    Resurrected SMLofNJ.Internals.BTrace.mode.  (It accidentally fell by
163    the wayside when I switched over to using Controls everywhere.)
164    
165    ----------------------------------------------------------------------
166    Name: Lal George
167    Date: 2002/05/23 12:21:40 EDT
168    Tag: george-20020523-visual-labels
169    Description:
170    
171    Labels are now displayed in the graphical output to make
172    the fall-through and target blocks obvious.
173    
174    ----------------------------------------------------------------------
175    Name: Matthias Blume
176    Date: 2002/05/22 11:03:00 EDT
177    Tag: blume-20020522-shrink
178    Description:
179    
180    John tweaked yesterday's fix for 1131 to handle an out-of-memory
181    situation that comes up when allocating huge arrays.
182    
183    ----------------------------------------------------------------------
184    Name: Matthias Blume
185    Date: 2002/05/21 16:00:00 EDT
186    Tag: Release_110_40
187    Description:
188    
189    New working release (110.40).  New bootfiles.
190    
191    [Also: John Reppy fixed GC bug 1131.]
192    
193    ----------------------------------------------------------------------
194    Name: Matthias Blume
195    Date: 2002/05/21 12:35:00 EDT
196    Tag: blume-20020521-cmdoc
197    Description:
198    
199    CM documentation update.
200    
201    ----------------------------------------------------------------------
202    Name: Matthias Blume
203    Date: 2002/05/21 10:55:00 EDT
204    Tag: blume-20020521-misc
205    Description:
206    
207    - John tweaked runtime to be silent on heap export (except when
208      GC messages are on).
209    - I added a few more things (cross-compiling versions of CMB) to
210      config/preloads (as suggestions).
211    
212    ----------------------------------------------------------------------
213    Name: Matthias Blume
214    Date: 2002/05/20 22:25:00 EDT
215    Tag: blume-20020520-controls
216    Description:
217    
218    - Added ControlUtil structure to control-lib.cm.
219    - Use it throughout.
220    - Used Controls facility to define MLRISC controls (as opposed to
221      registering MLRISC control ref cells with Controls after the fact)
222    - Fixed messed-up controls priorities.
223    
224    * Removed again all the stuff from config/preloads that one wouldn't
225      be able to preload at the time the initial heap image is built.
226      (Many libraries, e.g., CML, do not exist yet at this time.  The
227       only libraries that can be preloaded via config/preloads are those
228       that come bundled with the bootfiles.)
229    
230    ----------------------------------------------------------------------
231    Name: Matthias Blume
232    Date: 2002/05/20 10:59:00 EDT
233    Tag: blume-20020520-preloads
234    Description:
235    
236    Added a lot of commented-out suggestions for things to be included
237    in config/preloads.
238    
239    ----------------------------------------------------------------------
240    Name: Allen Leung
241    Date: 2002/05/18 14:20:00 EDT
242    Tag: leunga-20020518-mdl
243    Description:
244    
245    o Made the mdl tool stuff compile and run again.
246    o I've disabled all the stuff that depends on RTL specifications; they
247      are all badly broken anyway.
248    
249    ----------------------------------------------------------------------
250    Name: Matthias Blume
251    Date: 2002/05/17 16:49:00 EDT
252    Tag: blume-20020517-controls
253    Description:
254    
255    0. John Reppy made several modifications to the SML/NJ library.
256       In particular, there is a shiny new controls-lib.cm.
257    
258    1. Pushed new controls interface through compiler so that everything
259       compiles again.
260    
261    2. Added FormatComb and FORMAT_COMB to the CML version of the
262       SML/NJ library (so that CML compiles again).
263    
264    3. Modified init scripts because XXX_DEFAULT environment variables
265       are no longer with us.  (Boot-time initialization is now done
266       using the same environment variables that are also used for
267       startup-time initialization of controls.)
268    
269    ----------------------------------------------------------------------
270    Name: Lal George
271    Date: 2002/05/15 09:20:10 EDT
272    Tag: george-20020515-pseudo-op-decls
273    Description:
274    
275            All pseudo-ops emitted before the first segment declaration
276    such as TEXT, DATA, and BSS directives are assumed to be global
277    declarations and are emitted first in the assembly file. This is
278    useful in a number of situations where one has pseudo-ops that are not
279    specific to any segment, and also works around the constraint that one
280    cannot have client pseudo-ops in the TEXT segment.
281    
282            Because no segment is associated with these declarations it is
283    an error to allocate any space or objects before the first segment
284    directive and an exception will be raised. However, we cannot make
285    this check for client pseudo-ops.
286    
287            These top level declarations are a field in the CFG graph_info.
288    In theory you can continue to add to this field after the CFG has been
289    built -- provided you know what you are doing;-)
290    
291    ----------------------------------------------------------------------
292    Name: Matthias Blume
293    Date: 2002/05/13 16:40:00 EDT
294    Tag: blume-20020513-pp-etc
295    Description:
296    
297    A few minor bugfixes:
298    
299      - Stopgap measure for bug recently reported by Elsa Gunter (ppDec).
300        (Bogus printouts for redefined bindings still occur.  Compiler
301        bug should no longer occur now.  We need to redo the prettyprinter
302        from scratch.)
303    
304      - CM pathname printer now also adds escape sequences for ( and )
305    
306      - commend and docu fixes for ml-nlffi
307    
308    ----------------------------------------------------------------------
309    Name: Matthias Blume
310    Date: 2002/05/10 16:40:00 EDT
311    Tag: blume-20020510-erg-textio
312    Description:
313    
314    Applied the following bugfix provided by Emden Gansner:
315    
316        Output is corrupted when outputSubstr is used rather than output.
317    
318        The problem occurs when a substring
319    
320            ss = (s, dataStart, dataLen)
321    
322        where dataStart > 0, fills a stream buffer with avail bytes left.
323        avail bytes of s, starting at index dataStart, are copied into the
324        buffer, the buffer is flushed, and then the remaining dataLen-avail
325        bytes of ss are copied into the beginning of the buffer. Instead of
326        starting this copy at index dataStart+avail in s, the current code
327        starts the copy at index avail.
328    
329        Fix:
330        In text-io-fn.sml, change line 695 from
331             val needsFlush = copyVec(v, avail, dataLen-avail, buf, 0)
332        to
333             val needsFlush = copyVec(v, dataStart+avail, dataLen-avail, buf, 0)
334    
335    ----------------------------------------------------------------------
336    Name: Matthias Blume
337    Date: 2002/04/12 13:55:00 EDT
338    Tag: blume-20020412-assyntax
339    Description:
340    
341    1. Grabbed newer assyntax.h from the XFree86 project.
342    2. Fiddled with how to compile X86.prim.asm without warnings.
343    3. (Very) Minor cleanup in CM.
344    
345    ----------------------------------------------------------------------
346    Name: Matthias Blume
347    Date: 2002/04/01 (no joke!) 17:07:00 EST
348    Tag: blume-20020401-x86div
349    Description:
350    
351    Added full support for div/mod/rem/quot on the x86, using the machine
352    instruction's two results (without clumsily recomputing the remainder)
353    directly where appropriate.
354    
355    Some more extensive power-of-two support was added to the x86 instruction
356    selector (avoiding expensive divs, mods, and muls where they can be
357    replaced with cheaper shifts and masks).  However, this sort of thing
358    ought to be done earlier, e.g., within the CPS optimizer so that
359    all architectures benefit from it.
360    
361    The compiler compiles to a fixed point, but changes might be somewhat
362    fragile nevertheless.  Please, report any strange things that you might
363    see wrt. div/mod/quot/rem...
364    
365    ----------------------------------------------------------------------
366    Name: Matthias Blume
367    Date: 2002/03/29 17:22:00
368    Tag: blume-20020329-div
369    Description:
370    
371    Fixed my broken div/mod logic.  Unfortunately, this means that the
372    inline code for div/mod now has one more comparison than before.
373    Fast paths (quotient > 0 or remainder = 0) are not affected, though.
374    The problem was with quotient = 0, because that alone does not tell
375    us which way the rounding went.  One then has to look at whether
376    remainder and divisor have the same sign...  :(
377    
378    Anyway, I replaced the bootfiles with fresh ones...
379    
380    ----------------------------------------------------------------------
381    Name: Matthias Blume
382    Date: 2002/03/29 14:10:00 EST
383    Tag: blume-20020329-inlprims
384    Description:
385    
386    NEW BOOTFILES!!!    Version number bumped to 110.39.3.
387    
388    Primops have changed. This means that the bin/boot-file formats have
389    changed as well.
390    
391    To make sure that there is no confusion, I made a new version.
392    
393    
394    CHANGES:
395    
396    * removed REMT from mltree (remainder should never overflow).
397    
398    * added primops to deal with divisions of all flavors to the frontend
399    
400    * handled these primops all the way through so they map to their respective
401      MLRISC support
402    
403    * used these primops in the implementation of Int, Int32, Word, Word32
404    
405    * removed INLDIV, INLMOD, and INLREM as they are no longer necessary
406    
407    * parameterized INLMIN, INLMAX, and INLABS by a numkind
408    
409    * translate.sml now deals with all flavors of INL{MIN,MAX,ABS}, including
410      floating point
411    
412    * used INL{MIN,MAX,ABS} in the implementation of Int, Int32, Word, Word32,
413      and Real (but Real.abs maps to a separate floating-point-only primop)
414    
415    
416    TODO items:
417    
418    * Hacked Alpha32 instruction selection, disabling the selection of REMx
419      instructions because the machine instruction encoder cannot handle
420      them.  (Hppa, PPC, and Sparc instruction selection did not handle
421      REM in the first place, and REM is supported by the x86 machine coder.)
422    
423    * Handle DIV and MOD with DIV_TO_NEGINF directly in the x86 instruction
424      selection phase.  (The two can be streamlined because the hardware
425      delivers both quotient and remainder at the same time anyway.)
426    
427    * Think about what to do with "valOf(Int32.minInt) div ~1" and friends.
428      (Currently the behavior is inconsistent both across architectures and
429      wrt. the draft Basis spec.)
430    
431    * Word8 should eventually be handled natively, too.
432    
433    * There seems to be one serious bug in mltree-gen.sml.  It appears, though,
434      as if there currently is no execution path that could trigger it in
435      SML/NJ.  (The assumptions underlying functions arith and promotable do not
436      hold for things like multiplication and division.)
437    
438    ----------------------------------------------------------------------
439    Name: Matthias Blume
440    Date: 2002/03/27 16:27:00 EST
441    Tag: blume-20020327-mlrisc-divisions
442    Description:
443    
444    Added support for all four division operations (ML's div, mod, quot,
445    and rem) to MLRISC.  In the course of doing so, I also rationalized
446    the naming (no more annoying switch-around of DIV and QUOT), by
447    parameterizing the operation by div_rounding_mode (which can be either
448    DIV_TO_ZERO or DIV_TO_NEGINF).
449    
450    The generic MLTreeGen functor takes care of compiling all four
451    operations down to only round-to-zero div.
452    
453    Missing pieces:
454    
455      * Doing something smarter than relying on MLTreeGen on architectures
456        like, e.g., the x86 where hardware division delivers both quotient and
457        remainder at the same time.  With this, the implementation of the
458        round-to-neginf operations could be further streamlined.
459    
460      * Remove inlining support for div/mod/rem from the frontend and replace it
461        with primops that get carried through to the backend.  Do this for all
462        int and word types.
463    
464    ----------------------------------------------------------------------
465    Name: Matthias Blume
466    Date: 2002/03/25 17:25:00 EST
467    Tag: blume-20020325-divmod
468    Description:
469    
470    I improved (hopefully without breaking them) the implementation of Int.div,
471    Int.mod, and Int.rem.   For this, the code in translate.sml now takes
472    advantage of the following observations:
473    
474      Let  q = x quot y      r = x rem y
475           d = x div  y      m = x mod y
476    
477    where "quot" is the round-to-zero version of integer division that
478    hardware usually provides.  Then we have:
479    
480         r = x - q * y        where neither the * nor the - will overflow
481         d = if q >= 0 orelse x = q * y then q else q - 1
482                              where neither the * nor the - will overflow
483         m = if q >= 0 orelse r = 0 then r else r + y
484                              where the + will not overflow
485    
486    This results in substantial simplification of the generated code.
487    The following table shows the number of CFG nodes and edges generated
488    for
489            fun f (x, y) = x OPER y
490            (* with OPER \in div, mod, quot, rem *)
491    
492    
493        OPER | nodes(old) | edges(old) | nodes(new) | edges(new)
494        --------------------------------------------------------
495         div |         24 |         39 |         12 |         16
496         mod |         41 |         71 |         12 |         16
497        quot |          8 |         10 |          8 |         10
498         rem |         10 |         14 |          8 |         10
499    
500    
501    ----------------------------------------------------------------------
502    Name: Matthias Blume
503    Date: 2002/03/25 22:06:00 EST
504    Tag: blume-20020325-cprotobug
505    Description:
506    
507    Fixed a bug in cproto (c prototype decoder).
508    
509    ----------------------------------------------------------------------
510    Name: Matthias Blume
511    Date: 2002/03/25 16:00:00 EST
512    Tag: blume-20020325-raw-primops
513    Description:
514    
515    I did some cleanup to Allen's new primop code and
516    replaced yesterday's bootfiles with new ones.
517    (But they are stored in the same place.)
518    
519    ----------------------------------------------------------------------
520    Name: Matthias Blume
521    Date: 2002/03/24 22:40:00 EST
522    Tag: blume-20020324-bootfiles
523    Description:
524    
525    Made the bootfiles that Allen asked for.
526    
527    ----------------------------------------------------------------------
528    Name: Allen Leung
529    Date: 2002/03/23 15:50:00 EST
530    Tag: leunga-20020323-flint-cps-rcc-primops
531    Description:
532    
533      1. Changes to FLINT primops:
534    
535        (* make a call to a C-function;
536         * The primop carries C function prototype information and specifies
537         * which of its (ML-) arguments are floating point. C prototype
538         * information is for use by the backend, ML information is for
539         * use by the CPS converter. *)
540      | RAW_CCALL of { c_proto: CTypes.c_proto,
541                       ml_args: ccall_type list,
542                       ml_res_opt: ccall_type option,
543                       reentrant : bool
544                     } option
545       (* Allocate uninitialized storage on the heap.
546        * The record is meant to hold short-lived C objects, i.e., they
547        * are not ML pointers.  With the tag, the representation is
548        * the same as RECORD with tag tag_raw32 (sz=4), or tag_fblock (sz=8)
549        *)
550      | RAW_RECORD of {tag:bool,sz:int}
551      and ccall_type = CCALL_INT32 | CCALL_REAL64 | CCALL_ML_PTR
552    
553      2.  These CPS primops are now overloaded:
554    
555           rawload of {kind:numkind}
556           rawstore of {kind:numkind}
557    
558          The one argument form is:
559    
560             rawload {kind} address
561    
562          The two argument form is:
563    
564             rawload {kind} [ml object, byte-offset]
565    
566      3. RAW_CCALL/RCC now takes two extra arguments:
567    
568         a. The first is whether the C call is reentrant, i.e., whether
569            ML state should be saved and restored.
570         b. The second argument is a string argument specifying the name of
571            library and the C function.
572    
573         These things are currently not handled in the code generator, yet.
574    
575      4. In CProto,
576    
577         An encoding type of "bool" means "ml object" and is mapped into
578         C prototype of PTR.  Note that "bool" is different than "string",
579         even though "string" is also mapped into PTR, because "bool"
580         is assigned an CPS type of BOGt, while "string" is assigned INT32t.
581    
582      5. Pickler/unpicker
583    
584         Changed to handle RAW_RECORD and newest RAW_CCALL
585    
586      6. MLRiscGen,
587    
588         1. Changed to handle the new rawload/rawstore/rawrecord operators.
589         2. Code for handling C Calls has been moved to a new module CPSCCalls,
590            in the file CodeGen/cpscompile/cps-c-calls.sml
591    
592      7. Added the conditional move operator
593    
594             condmove of branch
595    
596         to cps.  Generation of this is still buggy so it is currently
597         disabled.
598    
599    ----------------------------------------------------------------------
600    Name: Lal George
601    Date: 2002/03/22 14:18:25 EST
602    Tag: george-20020322-cps-branch-prob
603    Description:
604    
605    Implemented the Ball-Larus branch prediction-heuristics, and
606    incorporated graphical viewers for control flow graphs.
607    
608    Ball-Larus Heuristics:
609    ---------------------
610    See the file compiler/CodeGen/cpscompile/cpsBranchProb.sml.
611    
612    By design it uses the Dempster-Shafer theory for combining
613    probabilities.  For example, in the function:
614    
615        fun f(n,acc) = if n = 0 then acc else f(n-1, n*acc)
616    
617    the ball-larus heuristics predicts that the n=0 is unlikely
618    (OH-heuristic), and the 'then' branch is unlikely because of the
619    RH-heuristic -- giving the 'then' branch an even lower combined
620    probability using the Dempster-Shafer theory.
621    
622    Finally, John Reppy's loop analysis in MLRISC, further lowers the
623    probability of the 'then' branch because of the loop in the else
624    branch.
625    
626    
627    Graphical Viewing:
628    ------------------
629    I merely plugged in Allen's graphical viewers into the compiler. The
630    additional code is not much. At the top level, saying:
631    
632            Control.MLRISC.getFlag "cfg-graphical-view" := true;
633    
634    will display the graphical view of the control flow graph just before
635    back-patching.  daVinci must be in your path for this to work. If
636    daVinci is not available, then the default viewer can be changed
637    using:
638    
639            Control.MLRISC.getString "viewer"
640    
641    which can be set to "dot" or "vcg" for the corresponding viewers. Of
642    course, these viewers must be in your path.
643    
644    The above will display the compilation unit at the level of clusters,
645    many of which are small, boring, and un-interesting. Also setting:
646    
647            Control.MLRISC.getInt "cfg-graphical-view_size"
648    
649    will display clusters that are larger than the value set by the above.
650    
651    
652    ----------------------------------------------------------------------
653    Name: Matthias Blume
654    Date: 2002/03/21 22:20:00 EST
655    Tag: blume-20020321-kmp-bugfix
656    Description:
657    
658    Changed the interface to the KMP routine in PreString and fixed
659    a minor bug in one place where it was used.
660    
661    ----------------------------------------------------------------------
662    Name: Allen Leung
663    Date: 2002/03/21 20:30:00 EST
664    Tag: leunga-20020321-cfg
665    Description:
666    
667      Fixed a potential problem in cfg edge splitting.
668    
669    ----------------------------------------------------------------------
670    Name: Allen Leung
671    Date: 2002/03/21 17:15:00 EST
672    Tag: leunga-20020321-x86-fp-cfg
673    Description:
674    
675      1. Recoded the buggy parts of x86-fp.
676    
677         a. All the block reordering code has been removed.
678            We now depend on the block placement phases to do this work.
679    
680         b. Critical edge splitting code has been simplified and moved into the
681            CFG modules, as where they belong.
682    
683         Both of these were quite buggy and complex.  The code is now much, much
684         simpler.
685    
686      2. X86 backend.
687    
688         a. Added instructions for 64-bit support.  Instruction selection for
689            64-bit has not been committed, however, since that
690            requires changes to MLTREE which haven't been approved by
691            Lal and John.
692    
693         b. Added support for FUCOMI and FUCOMIP when generating code for
694            PentiumPro and above.  We only generate these instructions in
695            the fast-fp mode.
696    
697         c. Added cases for JP and JNP in X86FreqProps.
698    
699      3. CFG
700    
701         CFG now has a bunch of methods for edge splitting and merging.
702    
703      4. Machine description.
704    
705         John's simplification of MLTREE_BASIS.fcond broke a few machine
706         description things:
707    
708         rtl-build.{sig,sml} and hppa.mdl fixed.
709    
710         NOTE: the machine description stuff in the repository is still broken.
711               Again, I can't put my fixes in because that involves
712               changes to MLTREE.
713    
714    ----------------------------------------------------------------------
715    Name: Matthias Blume
716    Date: 2002/03/20 15:55:00 EST
717    Tag: blume-20020320-kmp
718    Description:
719    
720    Implemented Knuth-Morris-Pratt string matching in PreString and used
721    it for String.isSubstring, Substring.isSubstring, and
722    Substring.position.
723    
724    (Might need some stress-testing.  Simple examples worked fine.)
725    
726    ----------------------------------------------------------------------
727    Name: Matthias Blume
728    Date: 2002/03/19 16:37:00 EST
729    Tag: blume-20020319-witnesses
730    Description:
731    
732    Added a structure C.W and functions convert/Ptr.convert to ml-nlffi-lib.
733    
734    This implements a generic mechanism for changing constness qualifiers
735    anywhere within big C types without resorting to outright "casts".
736    (So far, functions such as C.rw/C.ro or C.Ptr.rw/C.Ptr.ro only let you
737    modify the constness at the outermost level.)
738    The implementation of "convert" is based on the idea of "witness"
739    values -- values that are not used by the operation but whose types
740    "testify" to their applicability.  On the implementation side, "convert"
741    is simply a projection (returning its second curried argument).  With
742    cross-module inlining, it should not result in any machine code being
743    generated.
744    
745    ----------------------------------------------------------------------
746    Name: Matthias Blume
747    Date: 2002/03/15 16:40:00 EST
748    Tag: blume-20020315-basis
749    Description:
750    
751    Provided (preliminary?) implementations for
752    
753      {String,Substring}.{concatWith,isSuffix,isSubstring}
754    
755    and
756    
757      Substring.full
758    
759    Those are in the Basis spec but they were missing in SML/NJ.
760    
761    ----------------------------------------------------------------------
762    Name: Matthias Blume
763    Date: 2002/03/14 21:30:00 EST
764    Tag: blume-20020314-controls
765    Description:
766    
767    Controls:
768    ---------
769    
770    1. Factored out the recently-added Controls : CONTROLS stuff and put
771       it into its own library $/controls-lib.cm.  The source tree for
772       this is under src/smlnj-lib/Controls.
773    
774    2. Changed the names of types and functions in this interface, so they
775       make a bit more "sense":
776    
777          module -> registry
778          'a registry -> 'a group
779    
780    3. The interface now deals in ref cells only.  The getter/setter interface
781       is (mostly) gone.
782    
783    4. Added a function that lets one register an already-existing ref cell.
784    
785    5. Made the corresponding modifications to the rest of the code so that
786       everything compiles again.
787    
788    6. Changed the implementation of Controls.MLRISC back to something closer
789       to the original.  In particular, this module (and therefore MLRISC)
790       does not depend on Controls.  There now is some link-time code in
791       int-sys.sml that registers the MLRISC controls with the Controls
792       module.
793    
794    CM:
795    ---
796    
797      * One can now specify the lambda-split aggressiveness in init.cmi.
798    
799    ----------------------------------------------------------------------
800    Name: Allen Leung
801    Date: 2002/03/13 17:30:00 EST
802    Tag: leunga-20020313-x86-fp-unary
803    Description:
804    
805    Bug fix for:
806    
807    > leunga@weaselbane:~/Yale/tmp/sml-dist{21} bin/sml
808    > Standard ML of New Jersey v110.39.1 [FLINT v1.5], March 08, 2002
809    > - fun f(x,(y,z)) = Real.~ y;
810    > [autoloading]
811    > [autoloading done]
812    >       fchsl   (%eax), 184(%esp)
813    > Error: MLRisc bug: X86MCEmitter.emitInstr
814    >
815    > uncaught exception Error
816    >   raised at: ../MLRISC/control/mlriscErrormsg.sml:16.14-16.19
817    
818    The problem was that the code generator did not generate any fp registers
819    in this case, and the ra didn't know that it needed to run the X86FP phase to
820    translate the pseudo fp instruction.   This only happened with unary fp
821    operators in certain situations.
822    
823    ----------------------------------------------------------------------
824    Name: Matthias Blume
825    Date: 2002/03/13 14:00:00 EST
826    Tag: blume-20020313-overload-etc
827    Description:
828    
829    1. Added _overload as a synonym for overload for backward compatibility.
830       (Control.overloadKW must be true for either version to be accepted.)
831    
832    2. Fixed bug in install script that caused more things to be installed
833       than what was requested in config/targets.
834    
835    3. Made CM aware of the (_)overload construct so that autoloading
836       works.
837    
838    ----------------------------------------------------------------------
839    Name: Matthias Blume
840    Date: 2002/03/12 22:03:00 EST
841    Tag: blume-20020312-url
842    Description:
843    
844    Forgot to update BOOT and srcarchiveurl.
845    
846    ----------------------------------------------------------------------
847    Name: Matthias Blume
848    Date: 2002/03/12 17:30:00 EST
849    Tag: blume-20020312-version110392
850    Description:
851    
852    Yet another version number bump (because of small changes to the
853    binfile format).  Version number is now 110.39.2.  NEW BOOTFILES!
854    
855    Changes:
856    
857      The new pid generation scheme described a few weeks ago was overly
858      complicated.  I implemented a new mechanism that is simpler and
859      provides a bit more "stability":  Once CM has seen a compilation
860      unit, it keeps its identity constant (as long as you do not delete
861      those crucial CM/GUID/* files).  This means that when you change
862      an interface, compile, then go back to the old interface, and
863      compile again, you arrive at the original pid.
864    
865      There now also is a mechanism that instructs CM to use the plain
866      environment hash as a module's pid (effectively making its GUID
867      the empty string).  For this, "noguid" must be specified as an
868      option to the .sml file in question within its .cm file.
869      This is most useful for code that is being generated by tools such
870      as ml-nlffigen (because during development programmers tend to
871      erase the tool's entire output directory tree including CM's cached
872      GUIDs).  "noguid" is somewhat dangerous (since it can be used to locally
873      revert to the old, broken behavior of SML/NJ, but in specific cases
874      where there is no danger of interface confusion, its use is ok
875      (I think).
876    
877      ml-nlffigen by default generates "noguid" annotations.  They can be
878      turned off by specifying -guid in its command line.
879    
880    ----------------------------------------------------------------------
881    Name: Lal George
882    Date: 2002/03/12 12 14:42:36 EST
883    Tag: george-20020312-frequency-computation
884    Description:
885    
886    Integrated jump chaining and static block frequency into the
887    compiler. More details and numbers later.
888    
889    ----------------------------------------------------------------------
890  Name: Lal George  Name: Lal George
891  Date: 2002/03/11 11 22:38:53 EST  Date: 2002/03/11 11 22:38:53 EST
892  Tag: george-20020311-jump-chain-elim  Tag: george-20020311-jump-chain-elim
# Line 60  Line 934 
934  ----------------------------------------------------------------------  ----------------------------------------------------------------------
935  Name: Allen Leung  Name: Allen Leung
936  Date: 2002/03/11 10:30:00 EST  Date: 2002/03/11 10:30:00 EST
937  Tag: leunga-20020310-runtime-string0  Tag: leunga-20020311-runtime-string0
938  Description:  Description:
939    
940     The representation of the empty string now points to a     The representation of the empty string now points to a

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