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Diff of /sml/branches/primop-branch-3/NOTES/HISTORY

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revision 570, Wed Mar 8 17:30:13 2000 UTC revision 734, Sun Nov 19 05:27:41 2000 UTC
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13  Description:  Description:
14    
15  ----------------------------------------------------------------------  ----------------------------------------------------------------------
16  Name:  Name: Matthias Blume
17  Date:  Date: 2000/11/19 14:30:00 JST
18  Tag:  Tag:  blume-20001119-autoload
19  Description:  Description:
20    
21    Some hacking to make autoloading faster.  Success for CMB, no success
22    so far for CM.  There is a reduced structure CM' that autoloads faster.
23    (This is a temporary, non-documented hack to be eliminated again when
24    the general problem is solved.)
25    
26    ----------------------------------------------------------------------
27    Name: Matthias Blume
28    Date: 2000/11/17 14:10:00 JST
29    Tag: blume-20001117-pickle-lib
30    Description:
31    
32    1. Eliminated comp-lib.cm
33    2. Made pickle-lib.cm
34    3. Eliminated all uses of intset.sml (from comp-lib.cm)
35    4. Replaced all uses of intmap.{sig,sml} (from comp-lib.cm) with
36       equivalent constructs from smlnj-lib.cm (INtHashTable).
37    5. Point 4. also goes for those uses of intmap.* in MLRISC.
38       Duplicated intmap modules thrown out.
39    6. Hunted down all duplicated SCC code and replaced it with
40       equivalent stuff (GraphSCCFn from smlnj-lib.cm).
41    7. Rewrote Feedback module.
42    8. Moved sortedlist.sml into viscomp-lib.cm.  Eventually it
43       should be thrown out and equivalent modules from smlnj-lib.cm
44       should be used (IntRedBlackSet, IntListSet, ...).
45    
46    Confirmed that compiler compiles to fixpoint.
47    
48    ----------------------------------------------------------------------
49    Name: Allen Leung
50    Date: 2000/11/10 18:00:00
51    Tag: leunga-20001110-new-x86-fp
52    
53    A new x86 floating point code generator has been added.
54    By default this is turned off.  To turn this on, do:
55    
56        CM.autoload "$smlnj/compiler.cm";
57        Compiler.Control.MLRISC.getFlag "x86-fast-fp" := true;
58    
59    Changes:
60    
61    1.  Changed FTAN to FPTAN so that the assembly output is correct.
62    2.  Changed the extension callback for FTANGENT to generate:
63    
64              fptan
65              fstp  %st(0)
66        instead of
67              fptan
68              fstpl ftempmem
69    
70    3.  Numerous assembly fixes for x86.
71    
72    5.  Cleaned up the machine code output module x86/x86MC.sml and added
73        support for a whole bunch of instructions and addressing modes:
74    
75          fadd/fsub/fsubr/fmul/fdiv/fdivr  %st, %st(n)
76          faddp/fsubp/fsubrp/fmulp/fdivp/fdivrp  %st, %st(n)
77          fadd/fsub/fsubr/fmul/fdiv/fdivr  %st(n), %st
78          fiadd/fisub/fisubr/fimul/fidiv/fidivr mem
79          fxch %st(n)
80          fld %st(n)
81          fst %st(n)
82          fst mem
83          fstp %st(n)
84          fucom %st(n)
85          fucomp %st(n)
86    
87        All these are now generated when the fast fp mode is turned on.
88    
89    6.  Removed the dedicated registers %st(0), ..., %st(7) from X86CpsRegs
90    
91    ----------------------------------------------------------------------
92    Name: Matthias Blume
93    Date: 2000/11/09 11:20:00 JST
94    Tag: blume-20001109-scc
95    Description:
96    
97    Eliminated some code duplication:
98    
99    1. Added "where" clause to GraphSCCFn in SML/NJ Library.
100       (Otherwise the functor is useless.)
101    2. Used GraphSCCFn where SCCUtilFun was used previously.
102    3. Got rid of SCCUtilFun (in comp-lib.cm).
103    
104    ----------------------------------------------------------------------
105    Name: Lal George
106    Date: 2000/11/06 09:02:21 EST 2000
107    Tag: Release_110_30
108    Description:
109    
110    - Version 110.30
111    ----------------------------------------------------------------------
112    Name: Matthias Blume
113    Date: 2000/11/04 14:45:00
114    Tag: blume-20001104-mlbuild
115    Description:
116    
117    - Made ml-build faster on startup.
118    - Documentation fixes.
119    
120    ----------------------------------------------------------------------
121    Name: Matthias Blume
122    Date: 2000/11/02 17:00:00 JST
123    Tag: blume-20001102-condcomp
124    Description:
125    
126    - Small tweaks to pickler -- new BOOTFILES!
127    - Version bumped to 110.29.2.
128    - Added conditional compilation facility to init.cmi (see comment there).
129    ----------------------------------------------------------------------
130    Name: Allen Leung
131    Date: 2000/10/23 19:31:00
132    Tag: leunga-20001023-demo-ra
133    
134    1. Minor RA changes that improves spilling on x86 (affects Moby and C-- only)
135    2. Test programs for the graph library updated
136    3. Some new MLRISC demo programs added
137    
138    ----------------------------------------------------------------------
139    Name: Matthias Blume
140    Date: 2000/08/31 22:15:00 JST
141    Tag: blume-20001017-errmsg
142    Description:
143    
144    More error message grief: Where there used to be no messages, there
145    now were some that had bogus error regions.  Fixed.
146    
147    ----------------------------------------------------------------------
148    Name: Matthias Blume
149    Date: 2000/08/31 17:30:00 JST
150    Tag: blume-20001017-v110p29p1
151    Description:
152    
153    I made a version 110.29.1 with new bootfiles.
154    
155    Changes:  Modified pickler/unpickler for faster and leaner unpickling.
156              CM documentation changes and a small bugfix in CM's error reporting.
157    
158    ----------------------------------------------------------------------
159    Name: Lal George
160    Date: 2000/09/27 14:42:35 EDT
161    Tag: george-20000927-nodestatus
162    Description:
163    
164    Changed the type of the nodestatus, so that:
165    
166            SPILLED(~1)             is now SPILLED
167            SPILLED(m) where m>=0   is now MEMREG(m)
168            SPILLED(s) where s<~1   is now SPILL_LOC(~s)
169    
170    ----------------------------------------------------------------------
171    Name: Matthias Blume
172    Date: 2000/09/07 14:45:00 JST
173    Tag: blume-20000907-cmerrmsg
174    Description:
175    
176    Small tweak to CM to avoid getting ML syntax error messages twice.
177    
178    ----------------------------------------------------------------------
179    Name: Matthias Blume
180    Date: 2000/08/31 18:00:00 JST
181    Tag: blume-20000831-cvsbootfiles
182    Description:
183    
184    New URL for boot files (because the 110.29 files on the BL server do
185    now work correctly with my updated install scripts for yacc and lex).
186    
187    ----------------------------------------------------------------------
188    Name: Matthias Blume
189    Date: 2000/08/08 12:33:00 JST
190    Tag: blume-20000808-manual
191    Description:
192    
193    Tiny update to CM manual.
194    
195    ----------------------------------------------------------------------
196    Name: Allen Leung
197    Date: 2000/08/7 19:31:00
198    Tag: leunga-20000807-a-whole-bunch-of-stuff
199    
200      Moby, C--, SSA, x86, machine descriptions etc.  Should only affect C--
201    and Mobdy.
202    
203    1.  x86
204    
205       a.  Fixes to peephole module by John and Dan.
206       b.  Assembly fix to SETcc by Allen.
207       c.  Fix to c-call by John.
208       d.  Fix to spilling by John.  (This one deals with the missing FSTPT case)
209       e.  Instruction selection optimization to SETcc as suggested by John.
210    
211           For example,
212    
213            MV(32, x, COND(32, CMP(32, LT, a, b), LI 1, LI 0))
214    
215           should generate:
216    
217            MOVL a, x
218            SUBL b, x
219            SHRL 31, x
220    
221    2.  IR stuff
222    
223         A bunch of new DJ-graph related algorithms added.  These
224         speed up SSA construction.
225    
226    3.  SSA + Scheduling
227    
228         Added code for SSA and scheduling to the repository
229    
230    ----------------------------------------------------------------------
231    Name: Lal George
232    Date: 2000/07/27 11:53:14 EDT
233    
234    Tag: lal-20000727-linux-ppc
235    Description:
236    
237     Made changes to support Linux PPC.
238     p.s. I have confirmation that the 110.29 boot files work fine.
239    
240    ----------------------------------------------------------------------
241    Name: Matthias Blume
242    Date: 2000/07/27 17:40:00 JST
243    Tag: blume-20000727-scripts
244    Description:
245    
246    !!!! WARNING !!!!
247    You must recompile the runtime system!
248    !!!! WARNING !!!!
249    
250    This is basically another round of script-enhancements:
251    
252    1. sml, ml-build, and ml-makedepend accept options -D and -U to define
253       and undefine CM preprocessor symbols.
254    
255    2. ml-build avoids generating a new heap image if it finds that the
256       existing one is still ok.  (The condition is that no ML file had to
257       be recompiled and all ML files are found to be older that the heap
258       file.)
259    
260       To make this work smoothly, I also hacked the runtime system as
261       well as SMLofNJ.SysInfo to get access to the heap image suffix
262       (.sparc-solaris, ...) that is currently being used.
263    
264       Moreover, the signature of CM.mk_standalone has changed.  See the
265       CM manual.
266    
267    3. ml-makedepend accepts additional options -n, -a, and -o.  (See the
268       CM manual for details.)
269    
270    4. More CM manual updates:
271        - all of the above has been documented.
272        - there is now a section describing the (CM-related) command line
273          arguments that are accepted by the "sml" command
274    
275    ----------------------------------------------------------------------
276    Name: Matthias Blume
277    Date: 2000/07/25 16:20:00 JST
278    Tag: blume-20000725-makedepend
279    Description:
280    
281    Added a script called ml-makedepend.  This can be used in makefiles
282    for Unix' make in a way very similar to the "makedepend" command for
283    C.
284    
285    The script internally uses function CM.sources.
286    
287    Synopsis:
288    
289        ml-makedepend [-f makefile] cmfile targetname
290    
291    The default for the makefile is "makefile" (or "Makefile" should
292    "makefile" not exist).
293    
294    ml-makedepend adds a cmfile/targetname-specific section to this
295    makefile (after removing the previous version of this section).  The
296    section contains a single dependency specification with targetname on
297    the LHS (targetname is an arbitrary name), and a list of files derived
298    from the cmfile on the RHS.  Some of the files on the RHS are
299    ARCH/OPSYS-specific.  Therefore, ml-makedepend inserts references to
300    "make" variables $(ARCH) and $(OPSYS) in place of the corresponding
301    path names.  The makefile writer is responsible for making sure that
302    these variables have correct at the time "make" is invoked.
303    
304    ----------------------------------------------------------------------
305    Name: Matthias Blume
306    Date: 2000/07/22 23:30:00 JST
307    Tag: blume-20000722-urlupdate
308    Description:
309    
310    Changed BOOT and config/srcarchiveurl to point to BL server:
311    
312        ftp://ftp.research.bell-labs.com/dist/smlnj/working/110.29/
313    
314    ----------------------------------------------------------------------
315    Name: Matthias Blume
316    Date: 2000/07/18 18:00:00 JST
317    Tag: blume-20000718-Version_110_29
318    Description:
319    
320    1. Updated src/compiler/TopLevel/main/version.sml to version 110.29
321    
322    2. Updated config/version to 110.29
323    
324    3. Updated config/srcarchiveurl
325    
326    3. New boot files!
327       ftp://ftp.cs.princeton.edu/pub/people/blume/sml/110.29-autofetch
328    
329    ----------------------------------------------------------------------
330    Name: Matthias Blume
331    Date: 2000/07/11 13:58:00 JST
332    Tag: blume-20000711-doctypo
333    Description:
334    
335    Fixed a few typos in CM manual.
336    
337    ----------------------------------------------------------------------
338    Name: Allen Leung
339    Date: 2000/06/15 00:38:00
340    Tag: leunga-20000704-sparc-x86
341    
342    1. x86 peephole improvement sp += k; sp -= k => nop  [from John]
343    2. fix to x86 RET bug [found by Dan Grossman]
344    3. sparc assembly bug fix for ticc instructions [found by Fermin]
345    
346       Affects c-- and moby only
347    
348    ----------------------------------------------------------------------
349    Name: Matthias Blume
350    Date: 2000/07/04 15:26:00
351    Tag: blume-20000704-trigger
352    Description:
353    
354    1. Improvements to CM manual.
355    2. SMLofNJ.Internals.BTrace.trigger reinstated as an alternative way
356       of getting a back-trace.  The function, when called, raises an
357       internal exception which explicitly carries the full back-trace history,
358       so it is unaffected by any intervening handle-raise pairs ("trivial"
359       or not).  The interactive loop will print that history once it arrives
360       at top level.
361       Short of having all exceptions implicitly carry the full history, the
362       recommended way of using this facility is:
363         - compile your program with instrumentation "on"
364         - run it, when it raises an exception, look at the history
365         - if the history is "cut off" because of some handler, go and modify
366           your program so that it explicitly calls BTrace.trigger
367         - recompile (still instrumented), and rerun; look at the full history
368    
369    ----------------------------------------------------------------------
370    Name: Matthias Blume
371    Date: 2000/07/03 15:36:00 JST
372    Tag: blume-20000702-manual
373    Description:
374    
375    Small corrections and updates to CM manual.
376    
377    ----------------------------------------------------------------------
378    Name: Matthias Blume
379    Date: 2000/06/29 16:04:00 JST
380    Tag: blume-20000629-yacctool
381    Description:
382    
383    Changes:
384    
385    1. Class "mlyacc" now takes separate arguments to pass options to
386       generated .sml- and .sig-files independently.
387    2. Corresponding CM manual updates.
388    3. BTrace module now also reports call sites.  (However, for loop clusters
389       it only shows from where the cluster was entered.)  There are associated
390       modifications to core.sml, internals.{sig,sml}, btrace.sml, and btimp.sml.
391    
392    ----------------------------------------------------------------------
393    Name: Matthias Blume
394    Date: 2000/06/27 16:51:00 JST
395    Tag: blume-20000627-noweb
396    Description:
397    
398    Changes:
399    
400     1. Implemented "subdir" and "witness" options for noweb tool.
401        This caused some slight internal changes in CM's tool implementation.
402     2. Fixed bug in "tool plugin" mechanism.  This is essentially cleaning
403        some remaining issues from earlier path anchor changes.
404     3. Updated CM manual accordingly.
405    
406     4. Changed implementation of back-tracing so that I now consider it
407        ready for prime-time.
408    
409        In particular, you don't have to explicitly trigger the back-trace
410        anymore.  Instead, if you are running BTrace-instrumented code and
411        there is an uncaught exception (regardless of whether or not it was
412        raised in instrumented code), the top-level evalloop will print
413        the back-trace.
414    
415        Features:
416    
417          - Instrumented and uninstrumented code work together seemlessly.
418            (Of course, uninstrumented code is never mentioned in actual
419             back-traces.)
420    
421          - Asymptotic time- and space-complexity of instrumented code is
422            equal to that of uninstrumented code.  (This means that
423            tail-recursion is preserved by the instrumentation phase.)
424    
425          - Modules whose code has been instrumented in different sessions
426            work together without problem.
427    
428          - There is no penalty whatsoever on uninstrumented code.
429    
430          - There is no penalty on "raise" expressions, even in
431            instrumented code.
432    
433        A potential bug (or perhaps it is a feature, too):
434    
435          A back-trace reaches no further than the outermost instrumented
436          non-trivial "raise".  Here, a "trivial" raise is one that is the
437          sole RHS of a "handle" rule.  Thus, back-traces reach trough
438    
439               <exp> handle e => raise e
440    
441          and even
442    
443               <exp> handle Foo => raise Bar
444    
445          and, of course, through
446    
447               <exp> handle Foo => ...
448    
449         if the exception was not Foo.
450    
451         Back-traces always reach right through any un-instrumented code
452         including any of its "handle" expressions, trivial or not.
453    
454       To try this out, do the following:
455    
456         - Erase all existing binfiles for your program.
457           (You may keep binfiles for those modules where you think you
458            definitely don't need back-tracing.)
459         - Turn on back-trace instrumentation:
460              SMLofNJ.Internals.BTrace.mode (SOME true);
461         - Recompile your program.  (I.e., run "CM.make" or "use".)
462         - You may now turn instrumentation off again (if you want):
463              SMLofNJ.Internals.BTrace.mode (SOME false);
464         - Run your program as usual.  If it raises an exception that
465           reaches the interactive toplevel, then a back-trace will
466           automatically be printed.  After that, the toplevel loop
467           will print the exception history as usual.
468    
469    ----------------------------------------------------------------------
470    Name: Matthias Blume
471    Date: 2000/06/26 09:56:46 JST
472    Tag: blume-20000626-setup
473    Description:
474    
475    CM: - setup-parameter to "sml" added; this can be used to run arbitrary
476          ML code before and after compiling a file (e.g., to set compiler
477          flags)
478    
479    Compiler: - improved btrace API (in core.sml, internals.{sig,sml})
480              - associated changes to btrace.sml (BTrace instrumentation pass)
481              - cleaner implementation of btimp.sml (BTrace tracing and report
482                module)
483    
484    CM manual: * new path encoding documented
485               * description of setup-parameter to "sml" added
486    
487    The biggest user-visible change to back-tracing is that it is no
488    longer necessary to compile all traced modules within the same
489    session.  (This was a real limitation.)
490    
491    ----------------------------------------------------------------------
492    Name: Matthias Blume
493    Date: 2000/06/24 12:40:00 JST
494    Tag: blume-20000624-startup
495    Description:
496    
497    Fixes startup slowdown problem.  (I was calling SrcPath.sync a _tad_
498    bit too often -- to put it mildly. :)
499    
500    ----------------------------------------------------------------------
501    Name: Matthias Blume
502    Date: 2000/06/23 18:20:00 JST
503    Tag: blume-20000623-btrace
504    Description:
505    
506    This updates adds a backtrace facility to aid programmers in debugging
507    their programs.  This involves the following changes:
508    
509    1. Module system/smlnj/init/core.sml (structure _Core) now has hooks for
510       keeping track of the current call stack.  When programs are compiled
511       in a special mode, the compiler will insert calls to these hooks
512       into the user program.
513       "Hook" means that it is possible for different implementations of
514       back-tracing to register themselves (at different times).
515    
516    2. compiler/MiscUtil/profile/btrace.sml implements the annotation phase
517       as an Absyn.dec->Absyn.dec rewrite.  Normally this phase is turned off.
518       It can be turned on using this call:
519         SMLofNJ.Internals.BTrace.mode (SOME true);
520       Turning it off again:
521         SMLofNJ.Internals.BTrace.mode (SOME false);
522       Querying the current status:
523         SMLofNJ.Internals.BTrace.mode NONE;
524       Annotated programs are about twice as big as normal ones, and they
525       run a factor of 2 to 4 slower with a dummy back-trace plugin (one
526       where all hooks do nothing).  The slowdown with a plugin that is
527       actually useful (such as the one supplied by default) is even greater,
528       but in the case of the default plugin it is still only an constant
529       factor (amortized).
530    
531    3. system/Basis/Implementation/NJ/internals.{sig,sml} have been augmented
532       with a sub-structure BTrace for controlling back-tracing.  In particular,
533       the above-mentioned function "mode" controls whether the annotation
534       phase is invoked by the compiler.  Another important function is
535       "trigger": when called it aborts the current execution and causes
536       the top-level loop to print a full back-trace.
537    
538    4. compiler/MiscUtil/profile/btimp.sml is the current default plugin
539       for back-tracing.  It keeps track of the dynamic call stack and in
540       addition to that it keeps a partial history at each "level" of that
541       stack.  For example, if a tail-calls b, b tail-calls c, and c tail-calls
542       d and b (at separate times, dynamically), then the report will show:
543    
544       GOTO   d
545             /c
546       GOTO  \b
547       CALL   a
548    
549       This shows that there was an initial non-tail call of a, then a
550       tail-call to b or c, looping behavior in a cluster of functions that
551       consist of b and c, and then a goto from that cluster (i.e., either from
552       b or from c) to d.
553    
554       Note that (depending on the user program) the amount of information
555       that the back-trace module has to keep track of at each level is bounded
556       by a constant.  Thus, the whole implementation has the same asymptotical
557       complexity as the original program (both in space and in time).
558    
559    5. compiler/TopLevel/interact/evalloop.sml has been modified to
560       handle the special exception SMLofNJ.Internals.BTrace.BTrace
561       which is raised by the "trigger" function mentioned above.
562    
563    Notes on usage:
564    
565    - Annotated code works well together with unannotated code:
566    Unannotated calls simply do not show up at all in the backtrace.
567    
568    - It is not a good idea to let modules that were annotated during
569    different sessions run at the same time.  This is because the compiler
570    chooses small integers to identify individual functions, and there
571    will be clashes if different modules were compiled in separate sessions.
572    (Nothing will crash, and you will even be told about the clashes, but
573    back-trace information will in general not be useful.)
574    
575    - Back-tracing can be confused by callcc and capture.
576    
577    - The only way of getting a back-trace right now is to explicitly
578    invoke the "trigger" function from your user program.  Eventually, we
579    should make every exception carry back-trace information (if
580    available).  But since this creates more overhead at "raise"-time
581    (similar to the current exnHistory overhead), I have not yet
582    implemented this.  (The implementation will be rather easy.)  With
583    exceptions carrying back-trace information, this facility will be even
584    more useful because users don't need to modify their programs...
585    
586    - While it is possible to compile the compiler with back-trace
587    annotations turned on (I did it to get some confidence in
588    correctness), you must make absolutely sure that core.sml and
589    btimp.sml are compiled WITHOUT annotation!  (core.sml cannot actually
590    be compiled with annotation because there is no core access yet, but
591    if you compile btimp.sml with annotation, then the system will go into
592    an infinite recursion and crash.)
593    Since CM currently does not know about BTrace, the only way to turn
594    annotations on and off for different modules of the compiler is to
595    interrupt CMB.make, change the settings, and re-invoke it.  Of course,
596    this is awkward and clumsy.
597    
598    Sample sessions:
599    
600    Standard ML of New Jersey v110.28.1 [FLINT v1.5], June 5, 2000
601    - SMLofNJ.Internals.BTrace.mode (SOME true);
602    [autoloading]
603    [autoloading done]
604    val it = false : bool
605    - structure X = struct
606    -     fun main n = let
607    -         fun a (x, 0) = d x
608    -           | a (x, n) = b (x, n - 1)
609    -         and b (x, n) = c (x, n)
610    -         and c (x, n) = a (x, n)
611    -         and d x = e (x, 3)
612    -         and e (x, 0) = f x
613    -           | e (x, n) = e (x, n - 1)
614    -         and f 0 = SMLofNJ.Internals.BTrace.trigger ()
615    -           | f n = n * g (n - 1)
616    -         and g n = a (n, 3)
617    -     in
618    -         f n
619    -     end
620    - end;
621    structure X : sig val main : int -> int end
622    - X.main 3;
623    *** BACK-TRACE ***
624    GOTO   stdIn:4.2-13.20: X.main[2].f
625    GOTO-( stdIn:4.2-13.20: X.main[2].e
626    GOTO   stdIn:4.2-13.20: X.main[2].d
627         / stdIn:4.2-13.20: X.main[2].a
628         | stdIn:4.2-13.20: X.main[2].b
629    GOTO-\ stdIn:4.2-13.20: X.main[2].c
630    CALL   stdIn:4.2-13.20: X.main[2].g
631    GOTO   stdIn:4.2-13.20: X.main[2].f
632    GOTO-( stdIn:4.2-13.20: X.main[2].e
633    GOTO   stdIn:4.2-13.20: X.main[2].d
634         / stdIn:4.2-13.20: X.main[2].a
635         | stdIn:4.2-13.20: X.main[2].b
636    GOTO-\ stdIn:4.2-13.20: X.main[2].c
637    CALL   stdIn:4.2-13.20: X.main[2].g
638    GOTO   stdIn:4.2-13.20: X.main[2].f
639    GOTO-( stdIn:4.2-13.20: X.main[2].e
640    GOTO   stdIn:4.2-13.20: X.main[2].d
641         / stdIn:4.2-13.20: X.main[2].a
642         | stdIn:4.2-13.20: X.main[2].b
643    GOTO-\ stdIn:4.2-13.20: X.main[2].c
644    CALL   stdIn:4.2-13.20: X.main[2].g
645    GOTO   stdIn:4.2-13.20: X.main[2].f
646    CALL   stdIn:2.15-17.4: X.main[2]
647    -
648    
649    (Note that because of a FLINt bug the above code currently does not
650    compile without BTrace turned on.)
651    
652    Here is another example, using my modified Tiger compiler:
653    
654    Standard ML of New Jersey v110.28.1 [FLINT v1.5], June 5, 2000
655    - SMLofNJ.Internals.BTrace.mode (SOME true);
656    [autoloading]
657    [autoloading done]
658    val it = false : bool
659    - CM.make "sources.cm";
660    [autoloading]
661    ...
662    [autoloading done]
663    [scanning sources.cm]
664    [parsing (sources.cm):parse.sml]
665    [creating directory CM/SKEL ...]
666    [parsing (sources.cm):tiger.lex.sml]
667    ...
668    [wrote CM/sparc-unix/semant.sml]
669    [compiling (sources.cm):main.sml]
670    [wrote CM/sparc-unix/main.sml]
671    [New bindings added.]
672    val it = true : bool
673    - Main.compile ("../testcases/merge.tig", "foo.out");
674    *** BACK-TRACE ***
675    CALL   lib/semant.sml:99.2-396.21: SemantFun[2].transExp.trvar
676    CALL   lib/semant.sml:99.2-396.21: SemantFun[2].transExp.trexp
677    CALL   lib/semant.sml:289.3-295.22: SemantFun[2].transExp.trexp.check[2]
678    GOTO   lib/semant.sml:289.3-295.22: SemantFun[2].transExp.trexp.check[2]
679    CALL   lib/semant.sml:99.2-396.21: SemantFun[2].transExp.trexp
680    CALL   lib/semant.sml:99.2-396.21: SemantFun[2].transExp.trexp
681    CALL   lib/semant.sml:488.3-505.6: SemantFun[2].transDec.trdec[2].transBody[2]
682         / lib/semant.sml:411.65-543.8: SemantFun[2].transDec
683    CALL-\ lib/semant.sml:413.2-540.9: SemantFun[2].transDec.trdec[2]
684    CALL   lib/semant.sml:99.2-396.21: SemantFun[2].transExp.trexp
685    CALL   lib/semant.sml:8.52-558.4: SemantFun[2].transProg[2]
686    CALL   main.sml:1.18-118.4: Main.compile[2]
687    -
688    
689    ----------------------------------------------------------------------
690    Name: Matthias Blumen
691    Date: 2000/06/21 18:00:00 JST
692    Tag: blume-20000621-manual
693    Description:
694    
695    CM manual update: Path environments documented.
696    
697    ----------------------------------------------------------------------
698    Name: Matthias Blume
699    Date: 2000/06/19 13:40:00
700    Tag: blume-20000619-manual
701    Description:
702    
703    CM manual and system/README update.  This only covers the fact that
704    there are no more implicit anchors.  (Path environments and the "bind"
705    option to "cm" have yet to be documented.)
706    
707    ----------------------------------------------------------------------
708    Name: Matthias Blume
709    Date: 2000/06/19 11:05:00 JST
710    Tag: blume-20000619-chdir-bugfix
711    Description:
712    
713    Fixed a bug in new SrcPath module that sometimes led to a bad chDir call.
714    
715    ----------------------------------------------------------------------
716    Name: Matthias Blume
717    Date: 2000/06/18 22:00:10 JST
718    Tag: blume-20000618-implicit-anchors-really-gone
719    Description:
720    
721    I updates the previous HISTORY entry where I forgot to mention that
722    implicit anchors are no longer with us.
723    
724    The current update also gets rid of the (now useless) controller
725    CM.Control.implicit_anchors.
726    
727    ----------------------------------------------------------------------
728    Name: Matthias Blume
729    Date: 2000/06/16 17:30:00 JST
730    Tag: blume-20000616-anchorenv
731    Description:
732    
733    This patch implements the long anticipated (just kidding :) "anchor
734    environment" mechanism.  In the course of doing this, I also
735    re-implemented CM's internal "SrcPath" module from scratch.  The new
736    one should be more robust in certain boundary cases.  In any case, it
737    is a lot cleaner than its predecessor (IMHO).
738    
739    This time, although there is yet another boot file format change, I
740    kept the unpickler backward-compatible.  As a result, no new bootfiles
741    are necessary and bootstrapping is straightforward.  (You cannot read
742    new bootfiles into an old system, but the other way around is no
743    problem.)
744    
745    Visible changes:
746    
747    ** 0. Implicit path anchors (without the leading $-symbol) are no
748    longer recognized at all. This means that such path names are not
749    illegal either.  For example, the name basis.cm simply refers to a
750    local file called "basis.cm" (i.e, the name is an ordinary path
751    relative to .cm-files directory).  Or, to put it differently, only
752    names that start with $ are anchored paths.
753    
754    ** 1. The $<singlearc> abbreviation for $/<singlearc> has finally
755    vanished.
756    
757    John (Reppy) had critizised this as soon as I originally proposed and
758    implemented it, but at that time I did not really deeply believe
759    him. :) Now I came full-circle because I need the $<singlearc> syntax
760    in another place where it cannot be seen as an abbreviation for
761    $/<singlearc>.  To avoid the confusion, $<singlearc> now means what it
762    seems to mean (i.e., it "expands" into the corresponding anchor
763    value).
764    
765    However, when paths are used as members in CM description files, it
766    continues to be true that there must be at least another arc after the
767    anchor.  This is now enforced separately during semantic analysis
768    (i.e., from a lexical/syntactical point of view, the notation is ok.)
769    
770    ** 2. The "cm" class now accepts an option "bind".  The option's value
771    is a sub-option list of precisely two items -- one labeled "anchor"
772    and the other one labeled "value".  As you might expect, "anchor" is
773    used to specify an anchor name to be bound, and "value" specifies what
774    the anchor is being bound to.
775    
776    The value must be a directory name and can be given in either standard
777    syntax (including the possibility that it is itself an anchored path)
778    or native syntax.
779    
780    Examples:
781    
782       foo.cm (bind:(anchor:bar value:$mystuff/bar))
783       lib.cm (bind:(anchor:a value:"H:\\x\\y\\z"))  (* only works under windows *)
784    
785    and so on.
786    
787    The meaning of this is that the .cm-file will be processed with an
788    augmented anchor environment where the given anchor(s) is/are bound to
789    the given values(s).
790    
791    The rationale for having this feature is this: Suppose you are trying
792    to use two different (already stable) libraries a.cm and b.cm (that
793    you perhaps didn't write yourself).  Further, suppose each of these
794    two libraries internally uses its own auxiliary library $aux/lib.cm.
795    Normally you would now have a problem because the anchor "lib" can not
796    be bound to more than one value globally.  Therefore, the project that
797    uses both a.cm and b.cm must locally redirect the anchor to some other
798    place:
799    
800       a.cm (bind:(anchor:lib value:/usr/lib/smlnj/a-stuff))
801       b.cm (bind:(anchor:lib value:/usr/lib/smlnj/b-stuff))
802    
803    This hard-wires $lib/aux.cm to /usr/lib/smlnj/a-stuff/aux.cm or
804    /usr/lib/smlnj/b-stuff/aux.cm, respectively.
805    
806    Hard-wiring path names is a bit inflexible (and CM will verbosely warn
807    you when you do so at the time of CM.stabilize).  Therefore, you can
808    also use an anchored path as the value:
809    
810      a.cm (bind:(anchor:lib value:$a-lib))
811      b.cm (bind:(anchor:lib value:$b-lib))
812    
813    Now you can globally configure (using the usual CM.Anchor.anchor or
814    pathconfig machinery) bindings for "a-lib" and "b-lib".  Since "lib"
815    itself is always locally bound, setting it globally is no longer
816    meaningful or necessary (but it does not hurt either).  In fact, "lib"
817    can still be used as a global anchor for separate purposes.  As a
818    matter of fact, one can locally define "lib" in terms of a global
819    "lib":
820    
821      a.cm (bind:(anchor:lib value:$lib/a))
822      b.cm (bind:(anchor:lib value:$lib/b))
823    
824    ** 3: The encoding of path names has changed.  This affects the way
825    path names are shown in CM's progress report and also the internal
826    protocol encoding used for parallel make.
827    
828    The encoding now uses one or more ':'-separated segments.  Each
829    segments corresponds to a file that has been specified relative to the
830    file given by its preceding segment.  The first segment is either
831    relative to the CWD, absolute, or anchored.  Each segment itself is
832    basically a Unix pathname; all segments but the first are relative.
833    
834    Example:
835    
836       $foo/bar/baz.cm:a/b/c.sml
837    
838    This path denotes the file bar/a/b/c.sml relative to the directory
839    denoted by anchor "foo".  Notice that the encoding also includes
840    baz.cm which is the .cm-file that listed a/b/c.sml.  As usual, such
841    paths are resolved relative to the .cm-files directory, so baz.cm must
842    be ignored to get the "real" pathname.
843    
844    To make this fact more obvious, CM puts the names of such "virtual
845    arcs" into parentheses when they appear in progress reports. (No
846    parentheses will appear in the internal protocol encoding.)  Thus,
847    what you really see is:
848    
849      $foo/bar/(baz.cm):a/b/c.sml
850    
851    I find this notation to be much more informative than before.
852    
853    Another new feature of the encoding is that special characters
854    including parentheses, colons, (back)slashes, and white space are
855    written as \ddd (where ddd is the decimal encoding of the character).
856    
857    *** The CM manual still needs to be updated.
858    
859    ----------------------------------------------------------------------
860    Name: Allen Leung
861    Date: 2000/06/15 00:38:00
862    Tag: leunga-20000615-x86-peephole
863    
864    x86 Peephole fix by Fermin.  Affects c-- and moby only.
865    
866    ----------------------------------------------------------------------
867    Name: Matthias Blume
868    Date: 2000/06/12 11:40:00
869    Tag: blume-20000612-parmakefix
870    Description:
871    
872    More cleanup after changing the file naming scheme: This time I
873    repaired the parallel make mechanism for CMB.make which I broke earlier.
874    
875    ----------------------------------------------------------------------
876    Name: Allen Leung
877    Date: 2000/06/09 01:25:00
878    Tag: leunga-20000609-various
879    
880    None of these things should affect normal SML/NJ operations
881    
882    1. Peephole improvements provided by Fermin (c--)
883    2. New annotation DEFUSE for adding extra dependence (moby)
884    3. New X86 LOCK instructions (moby)
885    4. New machine description language for reservation tables (scheduling)
886    5. Fixes to various optimization/analysis modules (branch chaining, dominator
887       trees etc.)
888    6. I've changed the CM files so that they can work with versions
889       110.0.6, 110.25 and 110.28
890    
891    ----------------------------------------------------------------------
892    Name: Matthias Blume
893    Date: 2000/06/09 12:40:00
894    Tag: blume-20000609-log
895    Description:
896    
897    - Removed all(?) remaining RCS Log entries from sources.
898    
899    - Fixed bug in ml-yacc and ml-lex sources (use explicit anchors for
900      anchored paths).
901    
902    ----------------------------------------------------------------------
903    Name: Matthias Blume
904    Date: 2000/06/07 17:00:00 JST
905    Tag: blume-20000607-no-implicit-anchors
906    Description:
907    
908    1. This update changes the default setting for
909    CM.Control.implicit_anchors from true to false.  This means that
910    implicit anchors are no longer permitted by default.  I also tried to
911    make sure that nothing else still relies on implicit anchors.
912    (This is the next step on the schedule towards a CM that does not even
913    have the notion of implicit anchors anymore.)
914    
915    2. More CM manual updates.
916    
917    3. I managed to track down and fix the pickling bug I mentioned last
918    time.  Because of the previously existing workaround, this entails no
919    immediate practical changes.
920    
921    ----------------------------------------------------------------------
922    Name: Matthias Blume
923    Date: 2000/06/06 11:15:00 JST
924    Tag: blume-20000606-lazierpickle
925    Description:
926    
927    !!!! NEW BOOT FILES !!!!
928    
929    * The main purpose of this update is to make library pickles lazier in
930    order to reduce the initial space penalty for autoloading a library.
931    As a result, it is now possible to have $smlnj/compiler.cm
932    pre-registered.  This should take care of the many complaints or
933    inquiries about missing structure Compiler.  This required changes to
934    CM's internal data structures and small tweaks to some algorithms.
935    
936    As a neat additional effect, it is no longer necessary (for the sake
937    of lean heap image files) to distinguish between a "minimal" CM and a
938    "full" CM.  Now, there is only one CM (i.e., the "full" version:
939    $smlnj/cm.cm aka $smlnj/cm/full.cm), and it is always available at the
940    interactive top level. ($smlnj/cm/minimal.cm is gone.)
941    
942    To make the life of compiler-hackers easier, "makeml" now also
943    pre-registers $smlnj/cmb.cm (aka $smlnj/cmb/current.cm).  In other
944    words, after you bootstrap a new sml for the first time, you will not
945    have to autoload $smlnj/cmb.cm again afterwards.  (The first time
946    around you will still have to do it, though.)
947    
948    * A second change consists of major updates to the CM manual.  There
949    are now several appendices with summary information and also a full
950    specification of the CM description file syntax.
951    
952    * In directory src/system I added the script "allcross".  This script
953    invokes sml and cross-compiles the compiler for all supported
954    architectures.  (Useful when providing a new set of boot files.)
955    
956    * There seems to be a latent bug in my "lazy pickles" mechanism.  I
957    added a small tweak to pickle-util.sml to work around this problem,
958    but it is not a proper fix yet.  I will investigate further.  (The
959    effect of the bug was an inflation of library pickle size.)
960    
961    * Version number increased to 110.28.1 (to avoid compatibility problems).
962    
963    ----------------------------------------------------------------------
964    Name: Allen Leung
965    Date: 2000/05/25 17:28 EDT
966    Tag: leunga-20000525-ra
967    Description:
968    
969      Fixed a bug in freezing phase of the register allocator.
970    
971    ----------------------------------------------------------------------
972    Name: Allen Leung
973    Date: 2000/05/15 22:53 EDT
974    Tag: leunga-20000515-alpha-x86-ra
975    Description:
976    
977      1. Alpha
978    
979          Slight cleanup.  Removed the instruction SGNXL
980    
981      2. X86
982    
983          Added the following instructions to the instruction set:
984    
985            ROLx, RORx,
986            BTx, BTSx, BTLx, BTRx,
987            XCHGx, and variants with the LOCK prefix
988    
989      3. Register Allocation
990    
991          The module ra-rewrite-with-renaming has been improved.
992    
993      These have no effect on SML/NJ.
994    
995    ----------------------------------------------------------------------
996    Name: Matthias Blume
997    Date: 2000/05/15 16:20:00 JST
998    Tag: blume-20000515-lightrebuild
999    Description:
1000    
1001    1. I added an alternative to "-rebuild" to "makeml".  The difference is
1002       that prior to calling CMB.make' the CM-variable "LIGHT" will be
1003       defined.  In effect, the command will not build any cross-compiler
1004       backends and therefore finish more quickly.
1005    
1006       The "fixpt" script also takes a "-light" switch to be able to use
1007       this new facility while compiling for a fixpoint.
1008    
1009    2. I replaced all mentions of anchored paths in group owner specifications
1010       with simple relative paths (usually starting with "..").
1011       The rationale is that a library's internal workings should not be
1012       compromised by the lack of some anchor.  (An anchor is necessary
1013       for someone who wants to refer to the library by an anchored path,
1014       but it should not be necessary to build the same library in the first
1015       place.)
1016    
1017    3. I changed the way CM's tool mechanism determines the shell command
1018       string used for things like ml-yacc etc. so that it does not break
1019       when CM.Control.implicit_anchors is turned off.
1020    
1021    ----------------------------------------------------------------------
1022    Name: Matthias Blume
1023    Date: 2000/05/12 18:20:00 JST
1024    Tag: blume-20000512-ml-build
1025    Description:
1026    
1027    Fixed a bug in config/_ml-build that prevented ml-yacc and ml-lex from
1028    getting installed properly (by config/install.sh).
1029    
1030    ----------------------------------------------------------------------
1031    Name: Matthias Blume
1032    Date: 2000/05/12 17:30:00 JST
1033    Tag: blume-20000512-anchors
1034    Description:
1035    
1036    !!! NEW BOOT FILES !!!
1037    
1038    This change is in preparation of fading out support for "implicitly
1039    anchored path names".  I went through all sources and used the
1040    explicit (and relatively new) $-notation.  See system/README and the
1041    CM manual for more info on this.
1042    
1043    I also modified the anchoring scheme for some things such as "smlnj",
1044    "MLRISC", "cm", etc. to take advantage of the fact that explicit
1045    anchors are more expressive: anchor name and first arc do not have to
1046    coincide.  This entails the following user-visible change:
1047    
1048    You have to write $smlnj/foo/bar instead of smlnj/foo/bar.  In
1049    particular, when you fire up sml with a command-line argument, say,
1050    e.g.:
1051    
1052       sml '$smlnj/cmb.cm'
1053    
1054    At the ML toplevel prompt:
1055    
1056       CM.autoload "$smlnj/cmb.cm";
1057    
1058    There is also a new controller in CM.Control that can be used to turn
1059    off all remaining support for implicit anchors by saying:
1060    
1061        CM.autoload "$smlnj/
1062        #set CM.Control.implicit_anchors false;
1063    
1064    This causes CM to reject implicitly anchored paths.  This is (for the
1065    time being) less permissive than the "final" version where there will
1066    be no more such implicit anchors and relative paths will be just that:
1067    relative.
1068    
1069    The next step (version after next version?) will be to make the
1070    default for CM.Control.implicit_anchors false.  After the dust has
1071    settled, I can then produce the "final" version of this...
1072    
1073    Note: Since bootstrapping is a bit tricky, I provided new boot files.
1074    
1075    ----------------------------------------------------------------------
1076    Name: Matthias Blume
1077    Date: 2000/05/11 16:30:00 JST
1078    Tag: blume-20000511-sources
1079    Description:
1080    
1081    The main change is that I added function CM.sources as a generalized
1082    version of the earlier CM.makedepend.  This entails the following
1083    additional changes:
1084    
1085      - CM.makedepend has been dropped.
1086    
1087      - CM manual has been updated.
1088    
1089      - TOOLS signature and API have been changed.
1090    
1091    ----------------------------------------------------------------------
1092    Name: Allen Leung
1093    Date: 2000/05/10 21:17 EDT
1094    Tag: leunga-20000510-moby-c--ssa
1095    Description:
1096    
1097      Various bug fixes and new features for C--, Moby and MLRISC optimizations.
1098    None of these affect SML/NJ.
1099    
1100    1. Register Allocation
1101    
1102        a. A new ra spilling module (ra/ra-spill-with-renaming) is implemented.
1103           This module tries to remove local (i.e. basic block level) redundancies
1104           during spilling.
1105    
1106        b. A new framework for performing region based register allocation.
1107           Not yet entirely functional.
1108    
1109    2. X86
1110    
1111       a. DefUse for POP was missing the stack pointer [found by Lal]
1112       b. Reload for CALL was incorrect in X86Spill [found by John]
1113       c. Various fixes in X86Spill so that it can be used correctly for
1114          the new spilling module.
1115    
1116    3. SSA/IR
1117    
1118       a. New module ir/dj-dataflow.sml implements elimination based
1119          data flow analysis.
1120    
1121    4. MLRiscGen
1122    
1123       a. Fix for gc type annotation
1124    
1125    5. MDGen
1126    
1127       Various fixes for machine description -> ml code translation.  For ssa
1128       only.
1129    
1130    ----------------------------------------------------------------------
1131    Name: Allen Leung
1132    Date: 2000/05/08 22:17 EDT
1133    Tag: leunga-20000508-labexp
1134    Description:
1135    
1136      Fermin has found a few assembly problems with constant expressions
1137      generated in LabelExp.  Mostly, the problems involve extra parentheses,
1138      which choke on dumb assemblers.  This is his fix.
1139    
1140    ----------------------------------------------------------------------
1141    Name: Dave MacQueen
1142    Date: 2000/04/09 14:00 EDT
1143    Tag: dbm-20000502-Version_110_28
1144    Description:
1145    
1146    1. Updated src/compiler/TopLevel/main/version.sml to version 110.28
1147    
1148    2. Updated config/version to 110.28
1149    
1150    3. Updated config/srcarchiveurl
1151    
1152    3. New boot files!
1153       ftp://ftp.research.bell-labs.com/dist/smlnj/working/110.28/
1154    
1155    ----------------------------------------------------------------------
1156    Name: Matthias Blume
1157    Date: 2000/05/01 19:05:00 JST
1158    Tag: blume-20000501-noweb
1159    Description:
1160    
1161    A new noweb tool has been added.  The existing system is entirely
1162    unaffected by this, but some CM users have asked for renewed noweb
1163    support.  Everything is documented in the CM manual.
1164    
1165    New (plugin) libraries:
1166    
1167       noweb-tool.cm
1168       nw-ext.cm
1169    
1170    ----------------------------------------------------------------------
1171    Name: Dave MacQueen
1172    Date: 2000/04/30 12:40PM EDT
1173    Tag: dbm-20000430-bug_fixes
1174    Description:
1175    
1176    1. Fix for bug 1498
1177       smlnj/src/system/Basis/Implementation/Unsafe/object.sig
1178       smlnj/src/system/Basis/Implementation/Unsafe/object.sml
1179         added toRealArray function
1180       smlnj/src/compiler/MiscUtil/print/ppobj.sml
1181         added check for tag Obj.RealArray to array printing case in ppObj
1182    
1183    2. Fix for bug 1510
1184       smlnj/src/compiler/Semant/types/typesutil.sml
1185         fixed definition of dummyargs (used by equalTycon) so that
1186         dummy args are distinct types
1187    
1188    ----------------------------------------------------------------------
1189    Name: Matthias Blume
1190    Date: 2000/04/30 01:00:00 JST
1191    Tag: blume-20000430-versions
1192    Description:
1193    
1194    1. CM version numbering added.  This is an implementation of Lal's
1195       proposal for adding version numbers and version checking to .cm
1196       files.  Lal said that his proposal was just that -- a proposal.
1197       For the time being I went ahead and implemented it so that people
1198       can comment on it.  Everything is completely backward-compatible
1199       (except for the stable library format, i.e., new bootfiles!).
1200    
1201       As usual, see the CM manual for details.
1202    
1203    2. An alternative syntax for anchored paths has been implemented.
1204       Dave has recently voiced the same concerns that I had when I did
1205       this, so there should be some support.  My take is that eventually
1206       I will let support for the current syntax (where anchors are
1207       "implicit") fade out in favor of the new, explicit syntax.
1208       In order to be backward-compatible, both old and new syntax are
1209       currently supported.
1210    
1211       Again, see the CM manual for details.
1212    
1213    3. Parallel make is trying to be slightly smarter:  When the master
1214       process finds a "bottleneck", i.e., when there is only one
1215       compilation unit that can be compiled and everybody else is
1216       waiting on it, then it will simply compile it directly instead
1217       of clumsily telling one of the slaves to do it.
1218    
1219    4. Support for "unsharing" added.  This is necessary in order to be
1220       able to have two different versions of the same library running
1221       at the same time (e.g., for trying out a new MLRISC while still
1222       having the old MLRISC linked into the current compiler, etc.)
1223       See the CM manual.
1224    
1225    5. Simple "makedepend" functionality added for generating Makefile
1226       dependency information.  (This is rather crude at the moment.
1227       Expect some changes here in the future.)
1228    
1229    6. ".fun" added as a recognized suffix for ML files. Also documented
1230       explicitly in the manual that the fallback behavior (unknown suffix
1231       -> ML file) is not an official feature!
1232    
1233    7. Small changes to the pickler for stable libraries.
1234    
1235    8. Several internal changes to CM (for cleanup/improvement).
1236    
1237    
1238    !!!! NEW BINFILES !!!!
1239    
1240    ----------------------------------------------------------------------
1241    Name: Matthias Blume
1242    Date: 2000/04/28 17:30:00 JST
1243    Tag: blume-20000428-pathconfig
1244    Description:
1245    
1246    1. I changed config/install.sh to remove duplicate entries from the
1247       lib/pathconfig file at the end.  Moreover, the final version of
1248       lib/pathconfig is sorted alphabetically.  The same (sorting) is done
1249       in src/system/installml.
1250    
1251    2. The config/install.sh script now consistently uses relative
1252       pathnames in lib/pathconfig whenever the anchor is in the lib
1253       directory.  (So far this was true for the libraries that come
1254       pre-compiled and bundled as part of the bootfiles but not for
1255       libraries that are compiled by the script itself.)
1256    
1257    ----------------------------------------------------------------------
1258    Name: Matthias Blume
1259    Date: 2000/04/26 13:10:00 JST
1260    Tag: blume-20000426-fun_suffix
1261    Description:
1262    
1263    Added ".fun" as a recognized file name suffix (for ML code).
1264    
1265    ----------------------------------------------------------------------
1266    Name: Allen Leung
1267    Date: 2000/04/25 17:00:00 EST
1268    Tag: leunga-20000425-alpha-ra
1269    Description:
1270    
1271    1. Alpha
1272    
1273        PSEUDOARITH was missing in AlphaRewrite.  This causes an endless loop
1274    in C--.
1275    
1276    2. RA
1277    
1278       Added a flag "ra-dump-size" to print out the size of the flowgraph
1279       and the interference graph.
1280    
1281    ----------------------------------------------------------------------
1282    Name: Dave MacQueen
1283    Date: 2000/04/25/
1284    Tag: dbm-20000425-mlyacc_doc_examples
1285    Description:
1286      Updated mlyacc.tex sections 5 and 7 for SML '97 and CM.
1287      Updated all three examples in src/ml-yacc/examples to run
1288      under 110.* using CM.make.
1289    
1290    ----------------------------------------------------------------------
1291    Name: Allen Leung
1292    Date: 2000/04/20 23:04:00 EST
1293    Tag: leunga-20000420-ssa-c---stuff
1294    Description:
1295    
1296      This update synchronizes my repository with Yale's.  Most of these
1297    changes, however, do not affect SML/NJ at all (the RA is an exception).
1298    
1299    1. Register Allocator
1300    
1301       a. An improvement in the interference graph construction:
1302          Given a copy
1303    
1304                s <- t
1305    
1306          no interference edge between s and t is added for this definition of s.
1307    
1308       b. I've added two new spill heuristic modules that Fermin and I developed
1309          (in the new library RA.cm). These are unused in SML/NJ but maybe
1310          useful for others (Moby?)
1311    
1312    2. X86
1313    
1314       a. Various fixes in the backend provided by Fermin [C--] and Lal.
1315    
1316    3. Alpha
1317    
1318       a. Added the BSR instruction and code generation that goes with it [C--]
1319       b. Other fixes too numerous to recount provided by Fermin [C--]
1320    
1321    4. Regmaps
1322    
1323       a. The regmaps are not initialized with the identity physical bindings
1324          at creation time.  This is unneeded.
1325    
1326    5. MLRISC Optimizations
1327    
1328       a. The DJ-Graph module can now compute the iterated dominance frontiers
1329          intersects with liveness incrementally in linear time! Woohoo!
1330          This is now used in my new SSA construction algorithm.
1331    
1332       b. THe branch reorganization module is now smarter about linear chains of
1333          basic blocks.
1334    
1335    
1336    ----------------------------------------------------------------------
1337    Name: Matthias Blume
1338    Date: 2000/04/12 13:52:00 JST
1339    Tag: blume_main_v110p27_1
1340    Description:
1341    
1342    Changed install.sh script to handle archive files without version number
1343    and to use "boot.<arch>-<os>" instead of "sml.boot.<arch>-<os>" for the
1344    name of the boot file archive.
1345    
1346    ----------------------------------------------------------------------
1347    Name: Dave MacQueen
1348    Date: 2000/04/09 14:00 EDT
1349    Tag: dbm-20000410-Version_110_27
1350    Description:
1351    
1352    1. Updated src/compiler/TopLevel/main/version.sml to version 110.27
1353    
1354    2. Updated src/config/version to 110.27
1355    
1356    3. New boot files!
1357    
1358    ----------------------------------------------------------------------
1359    Name: Allen Leung
1360    Date: 2000/04/09 19:09:00 EST
1361    Tag: leunga-20000409-misc
1362    Description:
1363    
1364    1.  Yet another fix for x86 assembly for idivl, imull, mull and friends.
1365    
1366    2.  Miscellaneous improvements to MLRISC (unused in sml/nj)
1367    
1368    ----------------------------------------------------------------------
1369    Name: Stefan
1370    Date: 2000/04/07 10:00:00 EDT
1371    Tag: monnier-20000406-branch-handling
1372    Description:
1373    
1374    Improved handling of branches (mostly those generated from
1375    polymorphic equality), removed switchoff and changed the
1376    default optimization settings (more cpsopt and less flintopt).
1377    
1378    ----------------------------------------------------------------------
1379    Name: Allen Leung
1380    Date: 2000/04/06 01:30:00 EST
1381    Tag: leunga-20000406-peephole-x86-SSA-2
1382    Description:
1383    
1384       Forgot a few files.
1385    
1386    ----------------------------------------------------------------------
1387    Name: Allen Leung
1388    Date: 2000/04/06 00:36:00 EST
1389    Tag: leunga-20000406-peephole-x86-SSA
1390    Description:
1391    
1392    1.  New Peephole code
1393    
1394    2.  Minor improvement to X86 instruction selection
1395    
1396    3.  Various fixes to SSA and machine description -> code translator
1397    
1398    ----------------------------------------------------------------------
1399    Name: Matthias Blume
1400    Date: 2000/04/05 12:30:00 JST
1401    Tag: blume_main_v110p26p2_3
1402    Description:
1403    
1404    This update just merges three minor cosmetic updates to CM's sources
1405    to get ready for the 110.27 code freeze on Friday.  No functionality
1406    has changed.
1407    
1408    ----------------------------------------------------------------------
1409    Name: Allen Leung
1410    Date: 2000/04/04 19:39:00 EST
1411    Tag: leunga-20000404-x86-asm
1412    Description:
1413    
1414    1.  Fixed a problem in X86 assembly.
1415    
1416        Things like
1417    
1418           jmp %eax
1419           jmp (%eax)
1420    
1421        should be output as
1422    
1423           jmp *%eax
1424           jmp *(%eax)
1425    
1426    2.  Assembly output
1427    
1428          Added a new flag
1429    
1430              "asm-indent-copies" (default to false)
1431    
1432          When this flag is on, parallel copies will be indented an extra level.
1433    
1434    ----------------------------------------------------------------------
1435    Name: Allen Leung
1436    Date: 2000/04/04 03:18:00 EST
1437    Tag: leunga-20000404-C--Moby
1438    Description:
1439    
1440        All of these fixes are related to C--, Moby, and my own optimization
1441        stuff; so they shouldn't affect SML/NJ.
1442    
1443    1.  X86
1444    
1445        Various fixes related floating point, and extensions.
1446    
1447    2.  Alpha
1448    
1449        Some extra patterns related to loads with signed/zero extension
1450        provided by Fermin.
1451    
1452    3.  Assembly
1453    
1454        When generating assembly, resolve the value of client defined constants,
1455        instead of generating symbolic values.  This is controlled by the
1456        new flag "asm-resolve-constants", which is default to true.
1457    
1458    4.  Machine Descriptions
1459    
1460        a. The precedence parser was slightly broken when parsing infixr symbols.
1461        b. The type generalizing code had the bound variables reversed, resulting
1462           in a problem during arity raising.
1463        c. Various fixes in machine descriptions.
1464    
1465    ----------------------------------------------------------------------
1466    Name: Matthias Blume
1467    Date: 2000/04/03 16:05:00 JST
1468    Tag: blume_main_v110p26p2_2
1469    Description:
1470    
1471    I eliminated coreEnv from compInfo.  Access to the "Core" structure is
1472    now done via the ordinary static environment that is context to each
1473    compilation unit.
1474    
1475    To this end, I arranged that instead of "structure Core" as "structure
1476    _Core" is bound in the pervasive environment.  Core access is done via
1477    _Core (which can never be accidentally rebound because _Core is not a
1478    legal surface-syntax symbol).
1479    
1480    The current solution is much cleaner because the core environment is
1481    now simply part of the pervasive environment which is part of every
1482    compilation unit's context anyway.  In particular, this eliminates all
1483    special-case handling that was necessary until now in order to deal
1484    with dynamic and symbolic parts of the core environment.
1485    
1486    Remaining hackery (to bind the "magic" symbol _Core) is localized in the
1487    compilation manager's bootstrap compiler (actually: in the "init group"
1488    handling).  See the comments in src/system/smlnj/init/init.cmi for
1489    more details.
1490    
1491    I also tried to track down all mentions of "Core" (as string argument
1492    to Symbol.strSymbol) in the compiler and replaced them with a
1493    reference to the new CoreSym.coreSym.  Seems cleaner since the actual
1494    name appears in one place only.
1495    
1496    Binfile and bootfile format have not changed, but the switchover from
1497    the old "init.cmi" to the new one is a bit tricky, so I supplied new
1498    bootfiles anyway.
1499    
1500    ----------------------------------------------------------------------
1501    Name: Allen Leung
1502    Date: 2000/04/02 21:17:00 EST
1503    Tag: leunga-20000402-mltree
1504    Description:
1505    
1506       1. Renamed the constructor CALL in MLTREE by popular demand.
1507       2. Added a bunch of files from my repository.  These are currently
1508          used by other non-SMLNJ backends.
1509    
1510    ----------------------------------------------------------------------
1511    Name: Allen Leung
1512    Date: 2000/03/31 21:15:00 EST
1513    Tag: leunga-20000331-aliasing
1514    Description:
1515    
1516    This update contains a rewritten (and hopefully more correct) module
1517    for extracting aliasing information from CPS.
1518    
1519       To turn on this feature:
1520    
1521            Compiler.Control.CG.memDisambiguate := true
1522    
1523       To pretty print the region information with assembly
1524    
1525           Compiler.Control.MLRISC.getFlag "asm-show-region" := true;
1526    
1527       To control how many levels of aliasing information are printed, use:
1528    
1529           Compiler.Control.MLRISC.getInt "points-to-show-level" := n
1530    
1531       The default of n is 3.
1532    
1533    ----------------------------------------------------------------------
1534    Name: David MacQueen
1535    Date: 2000/03/31 11:15:00 EST
1536    Tag: dbm-20000331-runtime_fix
1537    Description:
1538    
1539    This update contains:
1540    
1541    1. runtime/c-lib/c-libraries.c
1542       includes added in revision 1.2 caused compilation errors on hppa-hpux
1543    
1544    2. fix for bug 1556
1545       system/Basis/Implementation/NJ/internal-signals.sml
1546    
1547    ----------------------------------------------------------------------
1548    Name: Matthias Blume
1549    Date: 2000/03/31 18:00:00 JST
1550    Tag: blume_main_v110p26p2_1
1551    Description:
1552    
1553    This update contains:
1554    
1555    1. A small change to CM's handling of stable libraries:
1556       CM now maintains one "global" modmap that is used for all stable
1557       libraries.  The use of such a global modmap maximizes sharing and
1558       minimizes the need for re-traversing parts of environments during
1559       modmap construction.  (However, this has minor impact since modmap
1560       construction seems to account for just one percent or less of total
1561       compile time.)
1562    
1563    2. I added a "genmap" phase to the statistics.  This is where I got the
1564       "one percent" number (see above).
1565    
1566    3. CM's new tool parameter mechanism just became _even_ better. :)
1567       - The parser understands named parameters and recursive options.
1568       - The "make" and "shell" tools use these new features.
1569         (This makes it a lot easier to cascade these tools.)
1570       - There is a small syntax change: named parameters use a
1571    
1572           <name> : ( <option> ... )            or
1573           <name> : <string>
1574    
1575         syntax.  Previously, named parameters were implemented in an
1576         ad-hoc fashion by each tool individually (by parsing strings)
1577         and had the form
1578    
1579           <name>=<string>
1580    
1581       See the CM manual for a full description of these issues.
1582    
1583    ----------------------------------------------------------------------
1584    Name: Matthias Blume
1585    Date: 2000/03/30 18:00:00 JST
1586    Tag: blume_main_v110p26p2_0
1587    Description:
1588    
1589    !!!!! WARNING !!!!!!
1590    !!  New binfiles  !!
1591    !!!!!!!!!!!!!!!!!!!!
1592    
1593    This update contains:
1594    
1595    1. Moderate changes to CM:
1596    
1597       - Changes to CM's tools mechanism.  In particular, it is now possible
1598       to have tools that accept additional "command line" parameters
1599       (specified in the .cm file at each instance where the tool's class is
1600       used).
1601    
1602       This was done to accommodate the new "make" and "shell" tools which
1603       facilitate fairly seamless hookup to portions of code managed using
1604       Makefiles or Shell scripts.
1605    
1606       There are no classes "shared" or "private" anymore.  Instead, the
1607       sharing annotation is now a parameter to the "sml" class.
1608    
1609       There is a bit of generic machinery for implementing one's own
1610       tools that accept command-line parameters.  However, I am not yet fully
1611       satisfied with that part, so expect changes here in the future.
1612    
1613       All existing tools are described in the CM manual.
1614    
1615       - Slightly better error handling.  (CM now suppresses many followup
1616       error messages that tended to be more annoying than helpful.)
1617    
1618    2. Major changes to the compiler's static environment data structures.
1619    
1620       - no CMStaticEnv anymore.
1621            - no CMEnv, no "BareEnvironment" (actually, _only_ BareEnvironment,
1622              but it is called Environment), no conversions between different
1623              kinds of static environments
1624    
1625       - There is still a notion of a "modmap", but such modmaps are generated
1626         on demand at the time when they are needed.  This sounds slow, but I
1627         sped up the code that generates modmaps enough for this not to lead to
1628         a slowdown of the compiler (at least I didn't detect any).
1629    
1630       - To facilitate rapid modmap generation, static environments now
1631         contain an (optional) "modtree" structure.  Modtree annotations are
1632         constructed by the unpickler during unpickling.  (This means that
1633         the elaborator does not have to worry about modtrees at all.)
1634         Modtrees have the advantage that they are compositional in the same
1635         way as the environment data structure itself is compositional.
1636         As a result, modtrees never hang on to parts of an environment that
1637         has already been rendered "stale" by filtering or rebinding.
1638    
1639       - I went through many, many trials and errors before arriving at the
1640         current solution.  (The initial idea of "linkpaths" did not work.)
1641         But the result of all this is that I have touched a lot of files that
1642         depend on the "modules" and "types" data structures (most of the
1643         elaborator). There were a lot of changes during my "linkpath" trials
1644         that could have been reverted to their original state but weren't.
1645         Please, don't be too harsh on me for messing with this code a bit more
1646         than what was strictly necessary...  (I _did_ resist the tempation
1647         of doing any "global reformatting" to avoid an untimely death at
1648         Dave's hands. :)
1649    
1650       - One positive aspect of the previous point:  At least I made sure that
1651         all files that I touched now compile without warnings (other than
1652         "polyEqual").
1653    
1654       - compiler now tends to run "leaner" (i.e., ties up less memory in
1655         redundant modmaps)
1656    
1657    ----------------------------------------------------------------------
1658    Name: Allen Leung
1659    Date: 2000/03/29 18:00:00
1660    Tag: leunga-20000327-mlriscGen_hppa_alpha_x86
1661    Boot files (optional): ftp://react-ilp.cs.nyu.edu/leunga/110.26.1-sml.boot.x86-unix-20000330.tar.gz
1662    Description:
1663    
1664       This update contains *MAJOR* changes to the way code is generated from CPS
1665    in the module mlriscGen, and in various backend modules.
1666    
1667    CHANGES
1668    =======
1669    
1670    1. MLRiscGen: forward propagation fix.
1671    
1672       There was a bug in forward propagation introduced at about the same time
1673       as the MLRISC x86 backend, which prohibits coalescing to be
1674       performed effectively in loops.
1675    
1676       Effect: speed up of loops in RISC architectures.
1677               By itself, this actually slowed down certain benchmarks on the x86.
1678    
1679    2. MLRiscGen:  forward propagating addresses from consing.
1680    
1681       I've changed the way consing code is generated.  Basically I separated
1682       out the initialization part:
1683    
1684            store tag,   offset(allocptr)
1685            store elem1, offset+4(allocptr)
1686            store elem2, offset+8(allocptr)
1687            ...
1688            store elemn, offset+4n(allocptr)
1689    
1690       and the address computation part:
1691    
1692            celladdr <- offset+4+alloctpr
1693    
1694       and move the address computation part
1695    
1696       Effect:  register pressure is generally lower as a result.  This
1697                makes compilation of certain expressions much faster, such as
1698                long lists with non-trivial elements.
1699    
1700                 [(0,0), (0,0), .... (0,0)]
1701    
1702    3. MLRiscGen: base pointer elimination.
1703    
1704        As part of the linkage mechanism, we generate the sequence:
1705    
1706         L:  ...  <- start of the code fragment
1707    
1708         L1:
1709             base pointer <- linkreg - L1 + L
1710    
1711         The base pointer was then used for computing relocatable addresses
1712       in the code fragment.  Frequently (such as in lots of continuations)
1713       this is not needed.  We now eliminate this sequence whenever possible.
1714    
1715         For compile time efficiency, I'm using a very stupid local heuristic.
1716       But in general, this should be done as a control flow analysis.
1717    
1718       Effect:  Smaller code size.  Speed up of most programs.
1719    
1720    4. Hppa back end
1721    
1722         Long jumps in span dependence resolution used to depend on the existence
1723      of the base pointer.
1724    
1725         A jump to a long label L was expanded into the following sequence:
1726    
1727          LDIL %hi(L-8192), %r29
1728          LDO  %lo(L-8192)(%r29), %r29
1729          ADD  %r29, baseptr, %r29
1730          BV,n %r0(%r29)
1731    
1732         In the presence of change (3) above, this will not work.  I've changed
1733       it so that the following sequence of instructions are generated, which
1734       doesn't mention the base pointer at all:
1735    
1736             BL,n  L', %r29           /* branch and link, L' + 4 -> %r29 */
1737        L':  ADDIL L-(L'+4), %r29     /* Compute address of L */
1738             BV,n  %r0(%r29)          /* Jump */
1739    
1740    5. Alpha back end
1741    
1742          New alpha instructions LDB/LDW have been added, as per Fermin's
1743       suggestions.   This is unrelated to all other changes.
1744    
1745    6. X86 back end
1746    
1747         I've changed andl to testl in the floating point test sequence
1748         whenever appropriate.  The Intel optimization guide states that
1749         testl is preferable to andl.
1750    
1751    7. RA (x86 only)
1752    
1753         I've improved the spill propagation algorithm, using an approximation
1754       of maximal weighted independent sets.   This seems to be necessary to
1755       alleviate the negative effect in light of the slow down in (1).
1756    
1757         I'll write down the algorithm one of these days.
1758    
1759    8. MLRiscGen: frequencies
1760    
1761         I've added an annotation that states that all call gc blocks have zero
1762       execution frequencies.  This improves register allocation on the x86.
1763    
1764    BENCHMARKS
1765    ==========
1766    
1767       I've only perform the comparison on 110.25.
1768    
1769       The platforms are:
1770    
1771        HPPA  A four processor HP machine (E9000) with 5G of memory.
1772        X86   A 300Hhz Pentium II with 128M of memory, and
1773        SPARC An Ultra sparc 2 with 512M of memory.
1774    
1775       I used the following parameters for the SML benchmarks:
1776    
1777                 @SMLalloc
1778         HPPA    256k
1779         SPARC   512k
1780         X86     256k
1781    
1782    COMPILATION TIME
1783    ----------------
1784       Here are the numbers comparing the compilation times of the compilers.
1785       I've only compared 110.25 compiling the new sources versus
1786       a fixpoint version of the new compiler compiling the same.
1787    
1788                     110.25                                  New
1789               Total  Time in RA  Spill+Reload   Total  Time In RA Spill+Reload
1790         HPPA   627s    116s        2684+3584     599s    95s       1003+1879
1791         SPARC  892s    173s        2891+3870     708s    116s      1004+1880
1792         X86    999s    315s       94006+130691   987s    296s    108877+141957
1793    
1794                   110.25         New
1795                Code Size      Code Size
1796         HPPA   8596736         8561421
1797         SPARC  8974299         8785143
1798         X86    9029180         8716783
1799    
1800       So in summary, things are at least as good as before.   Dramatic
1801       reduction in compilation is obtained on the Sparc; I can't explain it,
1802       but it is reproducible.  Perhaps someone should try to reproduce this
1803       on their own machines.
1804    
1805    SML BENCHMARKS
1806    --------------
1807    
1808        On the average, all benchmarks perform at least as well as before.
1809    
1810          HPPA         Compilation Time     Spill+Reload      Run Time
1811                     110.25  New            110.25    New   110.25  New
1812    
1813          barnesHut  3.158  3.015  4.75%    1+1       0+0   2.980  2.922   2.00%
1814              boyer  6.152  5.708  7.77%    0+0       0+0   0.218  0.213   2.34%
1815       count-graphs  1.168  1.120  4.32%    0+0       0+0  22.705 23.073  -1.60%
1816                fft  0.877  0.792 10.74%    1+3       1+3   0.602  0.587   2.56%
1817        knuthBendix  3.180  2.857 11.32%    0+0       0+0   0.675  0.662   2.02%
1818             lexgen  6.190  5.290 17.01%    0+0       0+0   0.913  0.788  15.86%
1819               life  0.803  0.703 14.22%   25+25      0+0   0.153  0.140   9.52%
1820              logic  2.048  2.007  2.08%    6+6       1+1   4.133  4.008   3.12%
1821         mandelbrot  0.077  0.080 -4.17%    0+0       0+0   0.765  0.712   7.49%
1822             mlyacc 22.932 20.937  9.53%  154+181    32+57  0.468  0.430   8.91%
1823            nucleic  5.183  5.060  2.44%    2+2       0+0   0.125  0.120   4.17%
1824      ratio-regions  3.357  3.142  6.84%    0+0       0+0  116.225 113.173 2.70%
1825                ray  1.283  1.290 -0.52%    0+0       0+0   2.887  2.855   1.11%
1826             simple  6.307  6.032  4.56%   28+30      5+7   3.705  3.658   1.28%
1827                tsp  0.888  0.862  3.09%    0+0       0+0   7.040  6.893   2.13%
1828               vliw 24.378 23.455  3.94%  106+127    25+45  2.758  2.707   1.91%
1829      --------------------------------------------------------------------------
1830       Average                     6.12%                                   4.09%
1831    
1832          SPARC        Compilation Time     Spill+Reload      Run Time
1833                     110.25  New            110.25    New   110.25  New
1834    
1835          barnesHut  3.778  3.592  5.20%    2+2       0+0   3.648  3.453    5.65%
1836              boyer  6.632  6.110  8.54%    0+0       0+0   0.258  0.242    6.90%
1837       count-graphs  1.435  1.325  8.30%    0+0       0+0  33.672 34.737   -3.07%
1838                fft  0.980  0.940  4.26%    3+9       2+6   0.838  0.827    1.41%
1839        knuthBendix  3.590  3.138 14.39%    0+0       0+0   0.962  0.967   -0.52%
1840             lexgen  6.593  6.072  8.59%    1+1       0+0   1.077  1.078   -0.15%
1841               life  0.972  0.868 11.90%   26+26      0+0   0.143  0.140    2.38%
1842              logic  2.525  2.387  5.80%    7+7       1+1   5.625  5.158    9.05%
1843         mandelbrot  0.090  0.093 -3.57%    0+0       0+0   0.855  0.728   17.39%
1844             mlyacc 26.732 23.827 12.19%  162+189    32+57  0.550  0.560   -1.79%
1845            nucleic  6.233  6.197  0.59%    3+3       0+0   0.163  0.173   -5.77%
1846      ratio-regions  3.780  3.507  7.79%    0+0       0+0 133.993 131.035   2.26%
1847                ray  1.595  1.550  2.90%    1+1       0+0   3.440  3.418    0.63%
1848             simple  6.972  6.487  7.48%   29+32      5+7   3.523  3.525   -0.05%
1849                tsp  1.115  1.063  4.86%    0+0       0+0   7.393  7.265    1.77%
1850               vliw 27.765 24.818 11.87%  110+135    25+45  2.265  2.135    6.09%
1851      ----------------------------------------------------------------------------
1852       Average                     6.94%                                    2.64%
1853    
1854          X86          Compilation Time     Spill+Reload      Run Time
1855                     110.25  New            110.25    New   110.25  New
1856    
1857          barnesHut  5.530  5.420  2.03%  593+893   597+915   3.532  3.440   2.66%
1858              boyer  8.768  7.747 13.19%  493+199   301+289   0.327  0.297  10.11%
1859       count-graphs  2.040  2.010  1.49%  298+394   315+457  26.578 28.660  -7.26%
1860                fft  1.327  1.302  1.92%  112+209   115+210   1.055  0.962   9.71%
1861        knuthBendix  5.218  5.475 -4.69%  451+598   510+650   0.928  0.932  -0.36%
1862             lexgen  9.970  9.623  3.60% 1014+841  1157+885   0.947  0.928   1.97%
1863               life  1.183  1.183  0.00%  162+182   145+148   0.127  0.103  22.58%
1864              logic  3.285  3.512 -6.45%  514+684   591+836   5.682  5.577   1.88%
1865         mandelbrot  0.147  0.143  2.33%   38+41     33+54    0.703  0.690   1.93%
1866             mlyacc 35.457 32.763  8.22% 3496+4564 3611+4860  0.552  0.550   0.30%
1867            nucleic  7.100  6.888  3.07%  239+168   201+158   0.175  0.173   0.96%
1868      ratio-regions  6.388  6.843 -6.65% 1182+257   981+300  120.142 120.345 -0.17%
1869                ray  2.332  2.338 -0.29%  346+398   402+494   3.593  3.540   1.51%
1870             simple  9.912  9.903  0.08% 1475+941  1579+1168  3.057  3.178  -3.83%
1871                tsp  1.623  1.532  5.98%  266+200   250+211   8.045  7.878   2.12%
1872               vliw 33.947 35.470 -4.29% 2629+2774 2877+3171  2.072  1.890   9.61%
1873      ----------------------------------------------------------------------------
1874       Average                     1.22%                                     3.36%
1875    
1876    ----------------------------------------------------------------------
1877    Name: Allen Leung
1878    Date: 2000/03/23 16:25:00
1879    Tag: leunga-20000323-fix_x86_alpha
1880    Description:
1881    
1882    1. X86 fixes/changes
1883    
1884       a.  The old code generated for SETcc was completely wrong.
1885           The Intel optimization guide is VERY misleading.
1886    
1887    2. ALPHA fixes/changes
1888    
1889       a.  Added the instructions LDBU, LDWU, STB, STW as per Fermin's suggestion.
1890       b.  Added a new mode byteWordLoadStores to the functor parameter to Alpha()
1891       c.  Added reassociation code for address computation.
1892    
1893    ----------------------------------------------------------------------
1894    Name: Allen Leung
1895    Date: 2000/03/22 01:23:00
1896    Tag: leunga-20000322-fix_x86_hppa_ra
1897    Description:
1898    
1899    1. X86 fixes/changes
1900    
1901       a.  x86Rewrite bug with MUL3 (found by Lal)
1902       b.  Added the instructions FSTS, FSTL
1903    
1904    2. PA-RISC fixes/changes
1905    
1906       a.  B label should not be a delay slot candidate!  Why did this work?
1907       b.  ADDT(32, REG(32, r), LI n) now generates one instruction instead of two,
1908           as it should be.
1909       c.  The assembly syntax for fstds and fstdd was wrong.
1910       d.  Added the composite instruction COMICLR/LDO, which is the immediate
1911           operand variant of COMCLR/LDO.
1912    
1913    3. Generic MLRISC
1914    
1915       a.  shuffle.sml rewritten to be slightly more efficient
1916       b.  DIV bug in mltree-simplify fixed (found by Fermin)
1917    
1918    4. Register Allocator
1919    
1920       a.  I now release the interference graph earlier during spilling.
1921           May improve memory usage.
1922    
1923    ----------------------------------------------------------------------
1924    Name: Matthias Blume
1925    Date: 2000/03/14 14:15:32
1926    Tag: blume_main_v110p26p1_2
1927    Description:
1928    
1929    1. Tools.registerStdShellCmdTool (from smlnj/cm/tool.cm) takes an
1930    additional argument called "template" which is an optional string that
1931    specifies the layout of the tool command line.  See the CM manual for
1932    explanation.
1933    
1934    2. A special-purpose tool can be "registered" by simply dropping the
1935    corresponding <...>-tool.cm (and/or <...>-ext.cm) into the same
1936    directory where the .cm file lives that uses this tool.  (The
1937    behavior/misfeature until now was to look for the tool description
1938    files in the current working directory.)  As before, tool description
1939    files could also be anchored -- in which case they can live anywhere
1940    they like.  Following the recent e-mail discussion, this change should
1941    make it easier to have special-purpose tools that are shipped together
1942    with the sources of the program that uses them.
1943    
1944    ----------------------------------------------------------------------
1945    Name: Matthias Blume
1946    Date: 2000/03/10 07:48:34
1947    Tag: blume_main_v110p26p1_1
1948    Description:
1949    
1950    I added a re-written version of Dave's fixpt script to src/system.
1951    Changes relative to the original version:
1952      - sh-ified (not everybody has ksh)
1953      - automatically figures out which architecture it runs on
1954      - uses ./makeml a bit more cleverly
1955      - never invokes ./installml (and, thus, does not clobber your
1956        good and working installation of sml in case something goes wrong)
1957      - accepts max iteration count using option "-iter <n>"
1958      - accepts a "base" name using option "-base <base>"
1959    
1960    It does not build any extraneous heap images but directly rebuilds
1961    bin- and boot-hierarchies using makeml's "-rebuild" switch. Finally,
1962    it can incorporate existing bin- and boot- hierarchies.  For example,
1963    suppose the base is set to "sml" (which is the default).  Then it
1964    successively builds
1965    
1966            sml.bin.<arch>-unix and sml.boot.<arch>-unix
1967    then    sml1.bin.<arch>-unix and sml1.boot.<arch>-unix
1968    then    sml2.bin.<arch>-unix and sml2.boot.<arch>-unix
1969    ...
1970    then    sml<n>.bin.<arch>-unix and sml<n>.boot.<arch>-unix
1971    
1972    and so on.  If any of these already exist, it will just use what's
1973    there.  In particular, many people will have the initial set of bin
1974    and boot files around, so this saves time for at least one full
1975    rebuild.  Having sets of the form <base><k>.{bin,boot}.<arch>-unix for
1976    <k>=1,2,... is normally not a good idea when invoking fixpt.  However,
1977    they might be the result of an earlier partial run of fixpt (which
1978    perhaps got accidentally killed).  In this case, fixpt will quickly
1979    move through what exists before continuing where it left off earlier,
1980    and, thus, saves a lot of time.
1981    
1982    ----------------------------------------------------------------------
1983    Name: Allen Leung
1984    Date: 00/03/10 02:20:00
1985    Tag: leunga-20000310-fix_x86_asm_ra
1986    Description:
1987    
1988    More assembly output problems involving the indexed addressing mode
1989    on the x86 have been found and corrected. Thanks to Fermin Reig for the
1990    fix.
1991    
1992    The interface and implementation of the register allocator have been changed
1993    slightly to accommodate the possibility to skip the register allocation
1994    phases completely and go directly to memory allocation.  This is needed
1995    for C-- use.
1996    
1997    ----------------------------------------------------------------------
1998    Name: Matthias Blume
1999    Date: 00/03/09 10:23:53
2000    Tag: blume_main_v110p26p1_0
2001    Description:
2002    
2003    * Complete re-organization of library names.  Many libraries have been
2004    consolidated so that they share the same path anchor.  For example,
2005    all MLRISC-related libraries are anchored at MLRISC, most libraries that
2006    are SML/NJ-specific are under "smlnj".  Notice that names like
2007    host-cmb.cm or host-compiler.cm no longer exist.  See system/README
2008    for a complete description of the new naming scheme.  Quick reference:
2009    
2010       host-cmb.cm        -> smlnj/cmb.cm
2011       host-compiler.cm   -> smlnj/compiler.cm
2012       full-cm.cm         -> smlnj/cm.cm
2013       <arch>-<os>.cm     -> smlnj/cmb/<arch>-<os>.cm
2014       <arch>-compiler.cm -> smlnj/compiler/<arch>.cm
2015    
2016    * Bug fixes in CM.
2017        - exceptions in user code are being passed through (i.e., reach top level)
2018        - more bugs in paranoia mode fixed
2019        - bug related to checking group owners fixed
2020    
2021    * New install.sh script that automagically fetches archive files:
2022      The new file config/srcarchiveurl must contain the URL of the
2023      (remote) directory that contains bin files (or other source archives).
2024      If install.sh does not find the archive locally, it tries to get
2025      it from that remote directory.
2026      This should simplify installation further:  For machines that have
2027      access to the internet, just fetch <version>-config.tgz, unpack it,
2028      edit config/targets, and go (run config/install.sh).  The script will
2029      fetch everything else that it might need all by itself.
2030    
2031      For CVS users, this mechanism is not relevant for source archives, but
2032      it is convenient for getting new sets of binfiles.
2033    
2034      Archives should be tar files compressed with either gzip, compress, or
2035      bzip2.  The script recognizes .tgz, .tar, tar.gz, tz, .tar.Z, and .tar.bz2.
2036    
2037    ----------------------------------------------------------------------
2038    Name: Matthias Blume
2039    Date: 2000/03/07 04:01:04
2040    Tag: blume_main_v110_26_2
2041    Description:
2042    - size info in BOOTLIST
2043         * no fixed upper limits for number of bootfiles or length of
2044           bootfile names in runtime
2045         * falling back to old behavior if no BOOTLIST size info found
2046    - allocation size heuristics in .run-sml
2047         * tries to read cache size from /proc/cpuinfo (this is important for
2048            small-cache Celeron systems!)
2049    - install.sh robustified
2050    - CM manual updates
2051    - paranoid mode
2052         * no more CMB.deliver() (i.e., all done by CMB.make())
2053         * can re-use existing sml.boot.* files
2054         * init.cmi now treated as library
2055         * library stamps for consistency checks
2056    - sml.boot.<arch>-<os>/PIDMAP file
2057         * This file is read by the CM startup code.  This is used to minimize
2058           the amount of dynamic state that needs to be stowed away for the
2059           purpose of sharing between interactive system and user code.
2060    - CM.Anchor.anchor instead of CM.Anchor.{set,cancel}
2061         * Upon request by Elsa.  Anchors now controlled by get-set-pair
2062           like most other CM state variables.
2063    - Compiler.CMSA eliminated
2064         * No longer supported by CM anyway.
2065    - fixed bugs in pickler that kept biting Stefan
2066         * past refs to past refs (was caused by the possibility that
2067           ad-hoc sharing is more discriminating than hash-cons sharing)
2068         * integer overflow on LargeInt.minInt
2069    - ml-{lex,yacc} build scripts now use new mechanism
2070      for building standalone programs
2071    - fixed several gcc -Wall warnings that were caused by missing header
2072      files, missing initializations, etc., in runtime (not all warnings
2073      eliminated, though)

Legend:
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  Added in v.734

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