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revision 1127, Fri Mar 8 01:35:33 2002 UTC revision 1220, Wed May 22 15:04:10 2002 UTC
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13  Description:  Description:
14    
15  ----------------------------------------------------------------------  ----------------------------------------------------------------------
16    Name: Matthias Blume
17    Date: 2002/05/22 11:03:00 EDT
18    Tag: blume-20020522-shrink
19    Description:
20    
21    John tweaked yesterday's fix for 1131 to handle an out-of-memory
22    situation that comes up when allocating huge arrays.
23    
24    ----------------------------------------------------------------------
25    Name: Matthias Blume
26    Date: 2002/05/21 16:00:00 EDT
27    Tag: Release_110_40
28    Description:
29    
30    New working release (110.40).  New bootfiles.
31    
32    [Also: John Reppy fixed GC bug 1131.]
33    
34    ----------------------------------------------------------------------
35    Name: Matthias Blume
36    Date: 2002/05/21 12:35:00 EDT
37    Tag: blume-20020521-cmdoc
38    Description:
39    
40    CM documentation update.
41    
42    ----------------------------------------------------------------------
43    Name: Matthias Blume
44    Date: 2002/05/21 10:55:00 EDT
45    Tag: blume-20020521-misc
46    Description:
47    
48    - John tweaked runtime to be silent on heap export (except when
49      GC messages are on).
50    - I added a few more things (cross-compiling versions of CMB) to
51      config/preloads (as suggestions).
52    
53    ----------------------------------------------------------------------
54    Name: Matthias Blume
55    Date: 2002/05/20 22:25:00 EDT
56    Tag: blume-20020520-controls
57    Description:
58    
59    - Added ControlUtil structure to control-lib.cm.
60    - Use it throughout.
61    - Used Controls facility to define MLRISC controls (as opposed to
62      registering MLRISC control ref cells with Controls after the fact)
63    - Fixed messed-up controls priorities.
64    
65    * Removed again all the stuff from config/preloads that one wouldn't
66      be able to preload at the time the initial heap image is built.
67      (Many libraries, e.g., CML, do not exist yet at this time.  The
68       only libraries that can be preloaded via config/preloads are those
69       that come bundled with the bootfiles.)
70    
71    ----------------------------------------------------------------------
72    Name: Matthias Blume
73    Date: 2002/05/20 10:59:00 EDT
74    Tag: blume-20020520-preloads
75    Description:
76    
77    Added a lot of commented-out suggestions for things to be included
78    in config/preloads.
79    
80    ----------------------------------------------------------------------
81    Name: Allen Leung
82    Date: 2002/05/18 14:20:00 EDT
83    Tag: leunga-20020518-mdl
84    Description:
85    
86    o Made the mdl tool stuff compile and run again.
87    o I've disabled all the stuff that depends on RTL specifications; they
88      are all badly broken anyway.
89    
90    ----------------------------------------------------------------------
91    Name: Matthias Blume
92    Date: 2002/05/17 16:49:00 EDT
93    Tag: blume-20020517-controls
94    Description:
95    
96    0. John Reppy made several modifications to the SML/NJ library.
97       In particular, there is a shiny new controls-lib.cm.
98    
99    1. Pushed new controls interface through compiler so that everything
100       compiles again.
101    
102    2. Added FormatComb and FORMAT_COMB to the CML version of the
103       SML/NJ library (so that CML compiles again).
104    
105    3. Modified init scripts because XXX_DEFAULT environment variables
106       are no longer with us.  (Boot-time initialization is now done
107       using the same environment variables that are also used for
108       startup-time initialization of controls.)
109    
110    ----------------------------------------------------------------------
111    Name: Lal George
112    Date: 2002/05/15 09:20:10 EDT
113    Tag: george-20020515-pseudo-op-decls
114    Description:
115    
116            All pseudo-ops emitted before the first segment declaration
117    such as TEXT, DATA, and BSS directives are assumed to be global
118    declarations and are emitted first in the assembly file. This is
119    useful in a number of situations where one has pseudo-ops that are not
120    specific to any segment, and also works around the constraint that one
121    cannot have client pseudo-ops in the TEXT segment.
122    
123            Because no segment is associated with these declarations it is
124    an error to allocate any space or objects before the first segment
125    directive and an exception will be raised. However, we cannot make
126    this check for client pseudo-ops.
127    
128            These top level declarations are a field in the CFG graph_info.
129    In theory you can continue to add to this field after the CFG has been
130    built -- provided you know what you are doing;-)
131    
132    ----------------------------------------------------------------------
133    Name: Matthias Blume
134    Date: 2002/05/13 16:40:00 EDT
135    Tag: blume-20020513-pp-etc
136    Description:
137    
138    A few minor bugfixes:
139    
140      - Stopgap measure for bug recently reported by Elsa Gunter (ppDec).
141        (Bogus printouts for redefined bindings still occur.  Compiler
142        bug should no longer occur now.  We need to redo the prettyprinter
143        from scratch.)
144    
145      - CM pathname printer now also adds escape sequences for ( and )
146    
147      - commend and docu fixes for ml-nlffi
148    
149    ----------------------------------------------------------------------
150    Name: Matthias Blume
151    Date: 2002/05/10 16:40:00 EDT
152    Tag: blume-20020510-erg-textio
153    Description:
154    
155    Applied the following bugfix provided by Emden Gansner:
156    
157        Output is corrupted when outputSubstr is used rather than output.
158    
159        The problem occurs when a substring
160    
161            ss = (s, dataStart, dataLen)
162    
163        where dataStart > 0, fills a stream buffer with avail bytes left.
164        avail bytes of s, starting at index dataStart, are copied into the
165        buffer, the buffer is flushed, and then the remaining dataLen-avail
166        bytes of ss are copied into the beginning of the buffer. Instead of
167        starting this copy at index dataStart+avail in s, the current code
168        starts the copy at index avail.
169    
170        Fix:
171        In text-io-fn.sml, change line 695 from
172             val needsFlush = copyVec(v, avail, dataLen-avail, buf, 0)
173        to
174             val needsFlush = copyVec(v, dataStart+avail, dataLen-avail, buf, 0)
175    
176    ----------------------------------------------------------------------
177    Name: Matthias Blume
178    Date: 2002/04/12 13:55:00 EDT
179    Tag: blume-20020412-assyntax
180    Description:
181    
182    1. Grabbed newer assyntax.h from the XFree86 project.
183    2. Fiddled with how to compile X86.prim.asm without warnings.
184    3. (Very) Minor cleanup in CM.
185    
186    ----------------------------------------------------------------------
187    Name: Matthias Blume
188    Date: 2002/04/01 (no joke!) 17:07:00 EST
189    Tag: blume-20020401-x86div
190    Description:
191    
192    Added full support for div/mod/rem/quot on the x86, using the machine
193    instruction's two results (without clumsily recomputing the remainder)
194    directly where appropriate.
195    
196    Some more extensive power-of-two support was added to the x86 instruction
197    selector (avoiding expensive divs, mods, and muls where they can be
198    replaced with cheaper shifts and masks).  However, this sort of thing
199    ought to be done earlier, e.g., within the CPS optimizer so that
200    all architectures benefit from it.
201    
202    The compiler compiles to a fixed point, but changes might be somewhat
203    fragile nevertheless.  Please, report any strange things that you might
204    see wrt. div/mod/quot/rem...
205    
206    ----------------------------------------------------------------------
207    Name: Matthias Blume
208    Date: 2002/03/29 17:22:00
209    Tag: blume-20020329-div
210    Description:
211    
212    Fixed my broken div/mod logic.  Unfortunately, this means that the
213    inline code for div/mod now has one more comparison than before.
214    Fast paths (quotient > 0 or remainder = 0) are not affected, though.
215    The problem was with quotient = 0, because that alone does not tell
216    us which way the rounding went.  One then has to look at whether
217    remainder and divisor have the same sign...  :(
218    
219    Anyway, I replaced the bootfiles with fresh ones...
220    
221    ----------------------------------------------------------------------
222    Name: Matthias Blume
223    Date: 2002/03/29 14:10:00 EST
224    Tag: blume-20020329-inlprims
225    Description:
226    
227    NEW BOOTFILES!!!    Version number bumped to 110.39.3.
228    
229    Primops have changed. This means that the bin/boot-file formats have
230    changed as well.
231    
232    To make sure that there is no confusion, I made a new version.
233    
234    
235    CHANGES:
236    
237    * removed REMT from mltree (remainder should never overflow).
238    
239    * added primops to deal with divisions of all flavors to the frontend
240    
241    * handled these primops all the way through so they map to their respective
242      MLRISC support
243    
244    * used these primops in the implementation of Int, Int32, Word, Word32
245    
246    * removed INLDIV, INLMOD, and INLREM as they are no longer necessary
247    
248    * parameterized INLMIN, INLMAX, and INLABS by a numkind
249    
250    * translate.sml now deals with all flavors of INL{MIN,MAX,ABS}, including
251      floating point
252    
253    * used INL{MIN,MAX,ABS} in the implementation of Int, Int32, Word, Word32,
254      and Real (but Real.abs maps to a separate floating-point-only primop)
255    
256    
257    TODO items:
258    
259    * Hacked Alpha32 instruction selection, disabling the selection of REMx
260      instructions because the machine instruction encoder cannot handle
261      them.  (Hppa, PPC, and Sparc instruction selection did not handle
262      REM in the first place, and REM is supported by the x86 machine coder.)
263    
264    * Handle DIV and MOD with DIV_TO_NEGINF directly in the x86 instruction
265      selection phase.  (The two can be streamlined because the hardware
266      delivers both quotient and remainder at the same time anyway.)
267    
268    * Think about what to do with "valOf(Int32.minInt) div ~1" and friends.
269      (Currently the behavior is inconsistent both across architectures and
270      wrt. the draft Basis spec.)
271    
272    * Word8 should eventually be handled natively, too.
273    
274    * There seems to be one serious bug in mltree-gen.sml.  It appears, though,
275      as if there currently is no execution path that could trigger it in
276      SML/NJ.  (The assumptions underlying functions arith and promotable do not
277      hold for things like multiplication and division.)
278    
279    ----------------------------------------------------------------------
280    Name: Matthias Blume
281    Date: 2002/03/27 16:27:00 EST
282    Tag: blume-20020327-mlrisc-divisions
283    Description:
284    
285    Added support for all four division operations (ML's div, mod, quot,
286    and rem) to MLRISC.  In the course of doing so, I also rationalized
287    the naming (no more annoying switch-around of DIV and QUOT), by
288    parameterizing the operation by div_rounding_mode (which can be either
289    DIV_TO_ZERO or DIV_TO_NEGINF).
290    
291    The generic MLTreeGen functor takes care of compiling all four
292    operations down to only round-to-zero div.
293    
294    Missing pieces:
295    
296      * Doing something smarter than relying on MLTreeGen on architectures
297        like, e.g., the x86 where hardware division delivers both quotient and
298        remainder at the same time.  With this, the implementation of the
299        round-to-neginf operations could be further streamlined.
300    
301      * Remove inlining support for div/mod/rem from the frontend and replace it
302        with primops that get carried through to the backend.  Do this for all
303        int and word types.
304    
305    ----------------------------------------------------------------------
306    Name: Matthias Blume
307    Date: 2002/03/25 17:25:00 EST
308    Tag: blume-20020325-divmod
309    Description:
310    
311    I improved (hopefully without breaking them) the implementation of Int.div,
312    Int.mod, and Int.rem.   For this, the code in translate.sml now takes
313    advantage of the following observations:
314    
315      Let  q = x quot y      r = x rem y
316           d = x div  y      m = x mod y
317    
318    where "quot" is the round-to-zero version of integer division that
319    hardware usually provides.  Then we have:
320    
321         r = x - q * y        where neither the * nor the - will overflow
322         d = if q >= 0 orelse x = q * y then q else q - 1
323                              where neither the * nor the - will overflow
324         m = if q >= 0 orelse r = 0 then r else r + y
325                              where the + will not overflow
326    
327    This results in substantial simplification of the generated code.
328    The following table shows the number of CFG nodes and edges generated
329    for
330            fun f (x, y) = x OPER y
331            (* with OPER \in div, mod, quot, rem *)
332    
333    
334        OPER | nodes(old) | edges(old) | nodes(new) | edges(new)
335        --------------------------------------------------------
336         div |         24 |         39 |         12 |         16
337         mod |         41 |         71 |         12 |         16
338        quot |          8 |         10 |          8 |         10
339         rem |         10 |         14 |          8 |         10
340    
341    
342    ----------------------------------------------------------------------
343    Name: Matthias Blume
344    Date: 2002/03/25 22:06:00 EST
345    Tag: blume-20020325-cprotobug
346    Description:
347    
348    Fixed a bug in cproto (c prototype decoder).
349    
350    ----------------------------------------------------------------------
351    Name: Matthias Blume
352    Date: 2002/03/25 16:00:00 EST
353    Tag: blume-20020325-raw-primops
354    Description:
355    
356    I did some cleanup to Allen's new primop code and
357    replaced yesterday's bootfiles with new ones.
358    (But they are stored in the same place.)
359    
360    ----------------------------------------------------------------------
361    Name: Matthias Blume
362    Date: 2002/03/24 22:40:00 EST
363    Tag: blume-20020324-bootfiles
364    Description:
365    
366    Made the bootfiles that Allen asked for.
367    
368    ----------------------------------------------------------------------
369    Name: Allen Leung
370    Date: 2002/03/23 15:50:00 EST
371    Tag: leunga-20020323-flint-cps-rcc-primops
372    Description:
373    
374      1. Changes to FLINT primops:
375    
376        (* make a call to a C-function;
377         * The primop carries C function prototype information and specifies
378         * which of its (ML-) arguments are floating point. C prototype
379         * information is for use by the backend, ML information is for
380         * use by the CPS converter. *)
381      | RAW_CCALL of { c_proto: CTypes.c_proto,
382                       ml_args: ccall_type list,
383                       ml_res_opt: ccall_type option,
384                       reentrant : bool
385                     } option
386       (* Allocate uninitialized storage on the heap.
387        * The record is meant to hold short-lived C objects, i.e., they
388        * are not ML pointers.  With the tag, the representation is
389        * the same as RECORD with tag tag_raw32 (sz=4), or tag_fblock (sz=8)
390        *)
391      | RAW_RECORD of {tag:bool,sz:int}
392      and ccall_type = CCALL_INT32 | CCALL_REAL64 | CCALL_ML_PTR
393    
394      2.  These CPS primops are now overloaded:
395    
396           rawload of {kind:numkind}
397           rawstore of {kind:numkind}
398    
399          The one argument form is:
400    
401             rawload {kind} address
402    
403          The two argument form is:
404    
405             rawload {kind} [ml object, byte-offset]
406    
407      3. RAW_CCALL/RCC now takes two extra arguments:
408    
409         a. The first is whether the C call is reentrant, i.e., whether
410            ML state should be saved and restored.
411         b. The second argument is a string argument specifying the name of
412            library and the C function.
413    
414         These things are currently not handled in the code generator, yet.
415    
416      4. In CProto,
417    
418         An encoding type of "bool" means "ml object" and is mapped into
419         C prototype of PTR.  Note that "bool" is different than "string",
420         even though "string" is also mapped into PTR, because "bool"
421         is assigned an CPS type of BOGt, while "string" is assigned INT32t.
422    
423      5. Pickler/unpicker
424    
425         Changed to handle RAW_RECORD and newest RAW_CCALL
426    
427      6. MLRiscGen,
428    
429         1. Changed to handle the new rawload/rawstore/rawrecord operators.
430         2. Code for handling C Calls has been moved to a new module CPSCCalls,
431            in the file CodeGen/cpscompile/cps-c-calls.sml
432    
433      7. Added the conditional move operator
434    
435             condmove of branch
436    
437         to cps.  Generation of this is still buggy so it is currently
438         disabled.
439    
440    ----------------------------------------------------------------------
441    Name: Lal George
442    Date: 2002/03/22 14:18:25 EST
443    Tag: george-20020322-cps-branch-prob
444    Description:
445    
446    Implemented the Ball-Larus branch prediction-heuristics, and
447    incorporated graphical viewers for control flow graphs.
448    
449    Ball-Larus Heuristics:
450    ---------------------
451    See the file compiler/CodeGen/cpscompile/cpsBranchProb.sml.
452    
453    By design it uses the Dempster-Shafer theory for combining
454    probabilities.  For example, in the function:
455    
456        fun f(n,acc) = if n = 0 then acc else f(n-1, n*acc)
457    
458    the ball-larus heuristics predicts that the n=0 is unlikely
459    (OH-heuristic), and the 'then' branch is unlikely because of the
460    RH-heuristic -- giving the 'then' branch an even lower combined
461    probability using the Dempster-Shafer theory.
462    
463    Finally, John Reppy's loop analysis in MLRISC, further lowers the
464    probability of the 'then' branch because of the loop in the else
465    branch.
466    
467    
468    Graphical Viewing:
469    ------------------
470    I merely plugged in Allen's graphical viewers into the compiler. The
471    additional code is not much. At the top level, saying:
472    
473            Control.MLRISC.getFlag "cfg-graphical-view" := true;
474    
475    will display the graphical view of the control flow graph just before
476    back-patching.  daVinci must be in your path for this to work. If
477    daVinci is not available, then the default viewer can be changed
478    using:
479    
480            Control.MLRISC.getString "viewer"
481    
482    which can be set to "dot" or "vcg" for the corresponding viewers. Of
483    course, these viewers must be in your path.
484    
485    The above will display the compilation unit at the level of clusters,
486    many of which are small, boring, and un-interesting. Also setting:
487    
488            Control.MLRISC.getInt "cfg-graphical-view_size"
489    
490    will display clusters that are larger than the value set by the above.
491    
492    
493    ----------------------------------------------------------------------
494    Name: Matthias Blume
495    Date: 2002/03/21 22:20:00 EST
496    Tag: blume-20020321-kmp-bugfix
497    Description:
498    
499    Changed the interface to the KMP routine in PreString and fixed
500    a minor bug in one place where it was used.
501    
502    ----------------------------------------------------------------------
503    Name: Allen Leung
504    Date: 2002/03/21 20:30:00 EST
505    Tag: leunga-20020321-cfg
506    Description:
507    
508      Fixed a potential problem in cfg edge splitting.
509    
510    ----------------------------------------------------------------------
511    Name: Allen Leung
512    Date: 2002/03/21 17:15:00 EST
513    Tag: leunga-20020321-x86-fp-cfg
514    Description:
515    
516      1. Recoded the buggy parts of x86-fp.
517    
518         a. All the block reordering code has been removed.
519            We now depend on the block placement phases to do this work.
520    
521         b. Critical edge splitting code has been simplified and moved into the
522            CFG modules, as where they belong.
523    
524         Both of these were quite buggy and complex.  The code is now much, much
525         simpler.
526    
527      2. X86 backend.
528    
529         a. Added instructions for 64-bit support.  Instruction selection for
530            64-bit has not been committed, however, since that
531            requires changes to MLTREE which haven't been approved by
532            Lal and John.
533    
534         b. Added support for FUCOMI and FUCOMIP when generating code for
535            PentiumPro and above.  We only generate these instructions in
536            the fast-fp mode.
537    
538         c. Added cases for JP and JNP in X86FreqProps.
539    
540      3. CFG
541    
542         CFG now has a bunch of methods for edge splitting and merging.
543    
544      4. Machine description.
545    
546         John's simplification of MLTREE_BASIS.fcond broke a few machine
547         description things:
548    
549         rtl-build.{sig,sml} and hppa.mdl fixed.
550    
551         NOTE: the machine description stuff in the repository is still broken.
552               Again, I can't put my fixes in because that involves
553               changes to MLTREE.
554    
555    ----------------------------------------------------------------------
556    Name: Matthias Blume
557    Date: 2002/03/20 15:55:00 EST
558    Tag: blume-20020320-kmp
559    Description:
560    
561    Implemented Knuth-Morris-Pratt string matching in PreString and used
562    it for String.isSubstring, Substring.isSubstring, and
563    Substring.position.
564    
565    (Might need some stress-testing.  Simple examples worked fine.)
566    
567    ----------------------------------------------------------------------
568    Name: Matthias Blume
569    Date: 2002/03/19 16:37:00 EST
570    Tag: blume-20020319-witnesses
571    Description:
572    
573    Added a structure C.W and functions convert/Ptr.convert to ml-nlffi-lib.
574    
575    This implements a generic mechanism for changing constness qualifiers
576    anywhere within big C types without resorting to outright "casts".
577    (So far, functions such as C.rw/C.ro or C.Ptr.rw/C.Ptr.ro only let you
578    modify the constness at the outermost level.)
579    The implementation of "convert" is based on the idea of "witness"
580    values -- values that are not used by the operation but whose types
581    "testify" to their applicability.  On the implementation side, "convert"
582    is simply a projection (returning its second curried argument).  With
583    cross-module inlining, it should not result in any machine code being
584    generated.
585    
586    ----------------------------------------------------------------------
587    Name: Matthias Blume
588    Date: 2002/03/15 16:40:00 EST
589    Tag: blume-20020315-basis
590    Description:
591    
592    Provided (preliminary?) implementations for
593    
594      {String,Substring}.{concatWith,isSuffix,isSubstring}
595    
596    and
597    
598      Substring.full
599    
600    Those are in the Basis spec but they were missing in SML/NJ.
601    
602    ----------------------------------------------------------------------
603    Name: Matthias Blume
604    Date: 2002/03/14 21:30:00 EST
605    Tag: blume-20020314-controls
606    Description:
607    
608    Controls:
609    ---------
610    
611    1. Factored out the recently-added Controls : CONTROLS stuff and put
612       it into its own library $/controls-lib.cm.  The source tree for
613       this is under src/smlnj-lib/Controls.
614    
615    2. Changed the names of types and functions in this interface, so they
616       make a bit more "sense":
617    
618          module -> registry
619          'a registry -> 'a group
620    
621    3. The interface now deals in ref cells only.  The getter/setter interface
622       is (mostly) gone.
623    
624    4. Added a function that lets one register an already-existing ref cell.
625    
626    5. Made the corresponding modifications to the rest of the code so that
627       everything compiles again.
628    
629    6. Changed the implementation of Controls.MLRISC back to something closer
630       to the original.  In particular, this module (and therefore MLRISC)
631       does not depend on Controls.  There now is some link-time code in
632       int-sys.sml that registers the MLRISC controls with the Controls
633       module.
634    
635    CM:
636    ---
637    
638      * One can now specify the lambda-split aggressiveness in init.cmi.
639    
640    ----------------------------------------------------------------------
641    Name: Allen Leung
642    Date: 2002/03/13 17:30:00 EST
643    Tag: leunga-20020313-x86-fp-unary
644    Description:
645    
646    Bug fix for:
647    
648    > leunga@weaselbane:~/Yale/tmp/sml-dist{21} bin/sml
649    > Standard ML of New Jersey v110.39.1 [FLINT v1.5], March 08, 2002
650    > - fun f(x,(y,z)) = Real.~ y;
651    > [autoloading]
652    > [autoloading done]
653    >       fchsl   (%eax), 184(%esp)
654    > Error: MLRisc bug: X86MCEmitter.emitInstr
655    >
656    > uncaught exception Error
657    >   raised at: ../MLRISC/control/mlriscErrormsg.sml:16.14-16.19
658    
659    The problem was that the code generator did not generate any fp registers
660    in this case, and the ra didn't know that it needed to run the X86FP phase to
661    translate the pseudo fp instruction.   This only happened with unary fp
662    operators in certain situations.
663    
664    ----------------------------------------------------------------------
665    Name: Matthias Blume
666    Date: 2002/03/13 14:00:00 EST
667    Tag: blume-20020313-overload-etc
668    Description:
669    
670    1. Added _overload as a synonym for overload for backward compatibility.
671       (Control.overloadKW must be true for either version to be accepted.)
672    
673    2. Fixed bug in install script that caused more things to be installed
674       than what was requested in config/targets.
675    
676    3. Made CM aware of the (_)overload construct so that autoloading
677       works.
678    
679    ----------------------------------------------------------------------
680    Name: Matthias Blume
681    Date: 2002/03/12 22:03:00 EST
682    Tag: blume-20020312-url
683    Description:
684    
685    Forgot to update BOOT and srcarchiveurl.
686    
687    ----------------------------------------------------------------------
688    Name: Matthias Blume
689    Date: 2002/03/12 17:30:00 EST
690    Tag: blume-20020312-version110392
691    Description:
692    
693    Yet another version number bump (because of small changes to the
694    binfile format).  Version number is now 110.39.2.  NEW BOOTFILES!
695    
696    Changes:
697    
698      The new pid generation scheme described a few weeks ago was overly
699      complicated.  I implemented a new mechanism that is simpler and
700      provides a bit more "stability":  Once CM has seen a compilation
701      unit, it keeps its identity constant (as long as you do not delete
702      those crucial CM/GUID/* files).  This means that when you change
703      an interface, compile, then go back to the old interface, and
704      compile again, you arrive at the original pid.
705    
706      There now also is a mechanism that instructs CM to use the plain
707      environment hash as a module's pid (effectively making its GUID
708      the empty string).  For this, "noguid" must be specified as an
709      option to the .sml file in question within its .cm file.
710      This is most useful for code that is being generated by tools such
711      as ml-nlffigen (because during development programmers tend to
712      erase the tool's entire output directory tree including CM's cached
713      GUIDs).  "noguid" is somewhat dangerous (since it can be used to locally
714      revert to the old, broken behavior of SML/NJ, but in specific cases
715      where there is no danger of interface confusion, its use is ok
716      (I think).
717    
718      ml-nlffigen by default generates "noguid" annotations.  They can be
719      turned off by specifying -guid in its command line.
720    
721    ----------------------------------------------------------------------
722    Name: Lal George
723    Date: 2002/03/12 12 14:42:36 EST
724    Tag: george-20020312-frequency-computation
725    Description:
726    
727    Integrated jump chaining and static block frequency into the
728    compiler. More details and numbers later.
729    
730    ----------------------------------------------------------------------
731    Name: Lal George
732    Date: 2002/03/11 11 22:38:53 EST
733    Tag: george-20020311-jump-chain-elim
734    Description:
735    
736    Tested the jump chain elimination on all architectures (except the
737    hppa).  This is on by default right now and is profitable for the
738    alpha and x86, however, it may not be profitable for the sparc and ppc
739    when compiling the compiler.
740    
741    The gc test will typically jump to a label at the end of the cluster,
742    where there is another jump to an external cluster containing the actual
743    code to invoke gc. This is to allow factoring of common gc invocation
744    sequences. That is to say, we generate:
745    
746            f:
747               testgc
748               ja   L1      % jump if above to L1
749    
750            L1:
751               jmp L2
752    
753    
754    After jump chain elimination the 'ja L1' instructions is converted to
755    'ja L2'. On the sparc and ppc, many of the 'ja L2' instructions may end
756    up being implemented in their long form (if L2 is far away) using:
757    
758            jbe     L3      % jump if below or equal to L3
759            jmp     L2
760         L3:
761            ...
762    
763    
764    For large compilation units L2  may be far away.
765    
766    
767    ----------------------------------------------------------------------
768    Name: Matthias Blume
769    Date: 2002/03/11 13:30:00 EST
770    Tag: blume-20020311-mltreeeval
771    Description:
772    
773    A functor parameter was missing.
774    
775    ----------------------------------------------------------------------
776    Name: Allen Leung
777    Date: 2002/03/11 10:30:00 EST
778    Tag: leunga-20020311-runtime-string0
779    Description:
780    
781       The representation of the empty string now points to a
782    legal null terminated C string instead of unit.  It is now possible
783    to convert an ML string into C string with InlineT.CharVector.getData.
784    This compiles into one single machine instruction.
785    
786    ----------------------------------------------------------------------
787    Name: Allen Leung
788    Date: 2002/03/10 23:55:00 EST
789    Tag: leunga-20020310-x86-call
790    Description:
791    
792       Added machine generation for CALL instruction (relative displacement mode)
793    
794    ----------------------------------------------------------------------
795    Name: Matthias Blume
796    Date: 2002/03/08 16:05:00
797    Tag: blume-20020308-entrypoints
798    Description:
799    
800    Version number bumped to 110.39.1.  NEW BOOTFILES!
801    
802    Entrypoints: non-zero offset into a code object where execution should begin.
803    
804    - Added the notion of an entrypoint to CodeObj.
805    - Added reading/writing of entrypoint info to Binfile.
806    - Made runtime system bootloader aware of entrypoints.
807    - Use the address of the label of the first function given to mlriscGen
808      as the entrypoint.  This address is currently always 0, but it will
809      not be 0 once we turn on block placement.
810    - Removed the linkage cluster code (which was The Other Way(tm) of dealing
811      with entry points) from mlriscGen.
812    
813    ----------------------------------------------------------------------
814  Name: Allen Leung  Name: Allen Leung
815  Date: 2002/03/07 20:45:00 EST  Date: 2002/03/07 20:45:00 EST
816  Tag: leunga-20020307-x86-cmov  Tag: leunga-20020307-x86-cmov

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