Home My Page Projects Code Snippets Project Openings SML/NJ
Summary Activity Forums Tracker Lists Tasks Docs Surveys News SCM Files

SCM Repository

[smlnj] Diff of /sml/trunk/HISTORY
ViewVC logotype

Diff of /sml/trunk/HISTORY

Parent Directory Parent Directory | Revision Log Revision Log | View Patch Patch

revision 1049, Thu Jan 31 21:03:49 2002 UTC revision 1352, Fri Sep 5 21:38:06 2003 UTC
# Line 13  Line 13 
13  Description:  Description:
14    
15  ----------------------------------------------------------------------  ----------------------------------------------------------------------
16    Name: Matthias Blume (blume@tti-c.org)
17    Date: 2003/09/04 16:30:00 CDT
18    Tag: blume-20030905-slices-etc
19    Description:
20    
21      1. Changed interface to vectors and arrays in Basis to match
22         (draft) Basis spec.
23      2. Added signatures and implementations of slices according to
24         Basis spec.
25      3. Edited source code throughout the system to make it compile again
26         under 1. and 2.  (In some cases code had to be added to have it
27         match the new signatures.)
28      4. MLRISC should be backward-compatible: the copies of the originals
29         of files that needed to change under 3. were retained, the .cm files
30         check the compiler version number and use old versions when
31         appropriate.
32      5. Changed type of OS.FileSys.readDir and Posix.FileSys.readdir to
33         dirstream -> string option (in accordance with Basis spec).
34      6. When generating code that counts lines, ml-lex used function
35         CharVector.foldli, taking advantage of its old interface.
36         This has been replaced with the corresponding code from
37         CharVectorSlice.  (html-lex must be re-lexed!)
38      7. BitArray in smlnj-lib/Util has been extended/modified to match the
39         new MONO_ARRAY signature.  (Do we need BitArraySlice?)
40      8. Removed temporary additions (fromInternal, toInternal) from the
41         (now obsolete) IntInf in smlnj-lib/Util.
42      9. Cleaned up structure Byte.
43     10. Added localOffset, scan, and fromString to Date (according to spec).
44         Cleaned/corrected implementation of Date.
45         (Still need to check for correctness; implement better canonicalizeDate.)
46     11. Added "scan" to signature IEEE_REAL.
47     12. Some improvements to IntInf [in particular: efficiency-hack for
48         mod and rem when second operand is 2 (for parity checks).]
49     13. Changed representation of type Time.time, using a single IntInf.int
50         value counting microseconds.  This considerably simplified the
51         implementation of structure Time.  We now support negative time
52         values; scan and fromString handle signs.
53     14. Functor PrimIO now takes two additional arguments (VectorSlice and
54         ArraySlice).
55    
56    ----------------------------------------------------------------------
57    Name: Matthias Blume (blume@tti-c.org)
58    Date: 2003/08/28 17:00:00 CDT
59    Tag: blume-20030828-intinf
60    Description:
61    
62    This is a major update which comes with a version number bump
63    (110.42.99 -- yes, we are really close to 110.43 :-), NEW BOOTFILES,
64    and an implementation of IntInf in the Basis.
65    
66    There are a fairly large number of related changes and updates throughout
67    the system:
68    
69    Basis:
70            - Implemented IntInf.
71            - Made LargeInt a projection of IntInf (by filtering through INTEGER).
72            - Added some missing Real64 operations, most notably Real.toLargeInt.
73            - Added FixedInt as a synonym for Int32.
74    
75    compiler:
76            * Added support for a built-in intinf type.
77              - literals
78              - pattern matching
79              - conversion shortcuts (Int32.fromLarge o Int.toLarge etc.)
80              - overloading on literals and operations
81    
82            This required adding a primitive type intinf, some additional
83            primops, and implementations for several non-trivial intinf
84            operations in Core.  (The intinf type is completely abstract
85            to the compiler; all operations get delegated back to the Core.)
86    
87            * Intinf equality is handled by polyequal.  However, the compiler
88            does not print its usual warning in this case (since polyequal
89            is the right thing to do there).
90    
91            * Improved the organization of structure InlineT.
92    
93            * A word about conversion primops:
94            If conversions involving intinf do not cancel out during
95            CPS contract, then the compiler must insert calls to Core functions.
96            Since all core access must be resolved already during the FLINT
97            translate phase, it would be too late a the time of CPS contract
98            to add new Core calls.  For this reason, conversion primops
99            for intinf carry two arguments:  1. the numeric argument that
100            they are supposed to convert, and 2. the Core function that
101            can help with this conversion if necessary.  If CPS contract
102            eliminates a primop, then the associated Core function becomes
103            dead and goes away.  Intinf conversion primops that do not get
104            eliminated by CPS contract get rewritten into calls of their
105            core functions by a separate, new phase.
106    
107    interactive system:
108            - Control.Print.intinfDepth controls max length of intinf constants
109            being printed. (Analogous to Control.Print.stringDepth.)
110            - Cleanup in printutil and pputil: got rid of unused stuff and
111            duplicates; replaced some of the code with code that makes better
112            use of library functionality.
113    
114    CM:
115            Bugfix: parse-errors in init group (system/smlnj/init/init.cmi)
116            are no longer silent.
117    
118    CKIT:
119            Fixed mismatched uses of Int32 and LargeInt.  I always decided
120            in favor of LargeInt -- which is now the same as IntInf.
121            CKIT-knowledgable people should check whether this is what's
122            intended and otherwise change things back to using Int32 or
123            FixedInt.
124    
125    Throughout the code:
126            Started using IntInf.int literals and built-in operations
127            (e.g., comparison with 0) where this seems appropriate.
128    
129    
130    ----------------------------------------------------------------------
131    Name: Dave MacQueen (dbm@cs.uchicago.edu)
132    Date: 2003/08/13 11:36:00 CDT
133    Tag: dbm-20030813-mcz-merge1
134    Description:
135    
136    Merging changes from the mcz-branch development branch into trunk.
137    These changes involve replacement of the emulated old prettyprinter
138    interface with direct use of the SML/NJ Lib PP library, and fixing
139    of a couple of bugs (895, 1186) relating to error messages.  A new
140    prettyprinter for ast datatypes (Elaborator/print/ppast.{sig,sml})
141    has been added.
142    
143    ----------------------------------------------------------------------
144    Name: Matthias Blume (blume@tti-c.org)
145    Date: 2003/08/11 15:45:00 CDT
146    Tag: blume-20030811-windows
147    Description:
148    
149    Version number bumped to 110.42.9.  NEW BOOTFILES!!!
150    
151        http://smlnj.cs.uchicago.edu/dist/working/110.42.9/
152    
153    This patch restores SML/NJ's ability to run under win32.  There are a
154    number of changes, including fixes for several bugs that had gone
155    unnoticed until now:
156    
157      - uname "CYGWIN_NT*" is recognized as win32 (This is relevant only when
158        trying to run the win32 version from within cygwin.)
159    
160      - There are a number of simple .bat scripts that substitute for their
161        corresponding Unix shell-scripts.  (See below.)
162    
163      - The internals of ml-build have been modified slightly.  The main
164        difference is that instead of calling ".link-sml" (or link-sml.bat)
165        using OS.Process.system, the ML process delegates this task back
166        to the script.  Otherwise problems arise in mixed environments such
167        as Cygwin where scripts look and work like Unix scripts, but
168        where OS.Process.system cannot run them.
169    
170      - In CM, the srcpath pickler used native pathname syntax -- which
171        is incorrect in the case of cross-compilation.  The new pickle format
172        is independent of platform-specific naming conventions.
173    
174      - Path configuration files (such as lib/pathconfig) can now choose
175        between native and standard syntax.  Placing a line of the form
176    
177            standard!
178    
179        into the file causes all subsequent paths to be interpreted using
180        CM standard pathname syntax (= Unix conventions); a line
181    
182            native!
183    
184        switches back to native style.  This was needed so that
185        path config files can be written portably, see src/system/pathconfig.
186    
187      - Runtime system:
188    
189          - win32-filesys.c:  get_file_time and set_file_time now
190            access modification time, not creation time.
191    
192          - I/O code made aware of new array representation.
193    
194          - Bug fixes in X86.prim.masm.
195    
196       - src/system/makeml made aware of win32. (For use under cygwin
197            and other Unix-environments for windows.)
198    
199       - In Basis, fixed off-by-one error in win32-io.sml (function vecF)
200         which caused BinIO.inputAll to fail consistently.
201    
202    .bat scripts:
203    
204       Windows .bat scripts assume that SMLNJ_HOME is defined.
205    
206       - sml.bat, ml-yacc.bat, ml-lex.bat:  Driver scripts for standalone
207         applications (sml, ml-yacc, ml-lex).
208       - ml-build.bat: analogous to ml-build.
209       - config\install.bat:  Analogous to config/install.sh.  This requires
210         that SMLNJ_HOME is set and that Microsoft Visual C is ready to use.
211         (nmake etc. must be on the path, and vcvars32 must have been run.)
212         Moreover, sources for ml-lex and ml-yacc need to exist under src,
213         and the bootfile hierarchy must have been unpacked under
214         sml.boot.x86-win32.
215         The script is very primitive and does a poor job at error checking.
216         It only installs the base system, ml-lex, and ml-yacc.  No other
217         libraries are being installed (i.e., you get only those that
218         are part of the compiler.)
219       - link-sml.bat:  analogous to .link-sml, but not currently used
220    
221    Unrelated bug fixes:
222    
223      - ml-nlffigen now exports structures ST_* corresponding to incomplete
224        types.
225      - Added getDevice to PP/src/pp-debug-fn.sml.  (Would not compile
226        otherwise.)
227    
228    ----------------------------------------------------------------------
229    Name: Dave MacQueen (macqueen@cs.uchicago.edu)
230    Date: 2003/06/17
231    Tag: macqueen-20030617-bug895
232    Description:
233    
234    Modified compiler/Elaborator/print/pptype.sml to fix bug 895.
235    Tag will be used for new development branch (mcz-branch) for
236    use by MacQueen, (Lucasz) Zairek, and (George) Cao at uchicago.
237    
238    ----------------------------------------------------------------------
239    Name: Matthias Blume (blume@tti-c.org)
240    Date: 2003/05/27 16:55:00 CDT
241    Tag: blume-20030527-polyeq
242    Description:
243    
244    Tried to eliminated most cases of polymorphic equality.
245    
246    ----------------------------------------------------------------------
247    Name: Matthias Blume (blume@tti-c.org)
248    Date: 2003/05/21 17:45:00 CDT
249    Tag: blume-20030517-complete
250    Description:
251    
252    Two changes:
253    
254      1. Added a flag for controlling whether non-exhaustive bindings will
255         be treated as errors (default is false).
256      2. Cleaned up the *entire* source tree so that CMB.make goes through
257         without a single non-exhaustive match- or bind warning.
258    
259    ----------------------------------------------------------------------
260    Name: Matthias Blume (blume@tti-c.org)
261    Date: 2003/05/17 10:20:00 CDT
262    Tag: blume-20030517-absyn
263    Description:
264    
265    1. Added cases for IF, WHILE, ANDALSO, and ORELSE to Absyn.
266    
267       This mainly affects the quality of error messages.  However, some
268       of the code is now more straightforward than before. (Treatment of
269       the above four constructs in translate.sml is much simpler than
270       the "macro-expansion" that was going on before.  Plus, the mach-
271       compiler no longer gets invoked just to be able to compile an
272       if-expression.)
273    
274    2. The ErrorMsg.Error exception is now caught and absorbed by the
275       interactive loop.
276    
277    ----------------------------------------------------------------------
278    Name: Allen Leung
279    Date: 2003/05/16 13:05:00 CDT
280    Tag: leunga-20030516-cygwin-runtime
281    Description:
282    
283        Ported the runtime system to cygwin, which uses the unix
284    x86-unix bin files.  Missing/buggy features:
285    
286       o getnetbyname, getnetbyaddr: these functions seem to be missing in
287         the Cygwin library.
288       o Ctrl-C handling may be flaky.
289       o Windows system calls and Windows I/O are not supported.
290    
291       A new set of binfiles is located at:
292    
293         http://www.dorsai.org/~leunga/boot.x86-unix.tgz
294    
295       This is only needed for bootstrapping the cygwin version of smlnj.
296       Other x86 versions can use the existing binfiles.
297    
298    ----------------------------------------------------------------------
299    Name: Matthias Blume
300    Date: 2003/04/08 15:42:00 CDT
301    Tag: blume-20030408-listpair
302    Description:
303    
304    1. Added a target 'mlrisc' to installer.
305    
306    2. Added missing elements to structure ListPair.
307    
308    ----------------------------------------------------------------------
309    Name: Allen Leung
310    Date: 2003/01/07 10:40:00 EST
311    Tag: leunga-20030107-int-rem
312    Description:
313    
314    Fixed a bug in Int.rem(x,y) where y is a power of 2 on x86.
315    The arguments to the SUBL instruction were swapped.
316    
317    ----------------------------------------------------------------------
318    Name: Matthias Blume
319    Date: 2002/12/12 16:25:00 EST
320    Tag: blume-20021212-risc-ra
321    Description:
322    
323    Fixed a serious bug in the rewrite code for FP spilling/reloading that
324    sent the RA into an infinite loop when floating point registers get
325    spilled.  (Because of this bug, e.g., nucleic stopped compiling between
326    110.37 and 110.38.)
327    There was another set of potential problems related to the handling of
328    MLRISC annotations (but those did not yet cause real problems, apparently).
329    
330    ----------------------------------------------------------------------
331    Name: Matthias Blume
332    Date: 2002/12/06 22:40:00 EST
333    Tag: blume-20021206-cm-fileid
334    Description:
335    
336    Added a call of SrcPath.sync at the beginning of Parse.parse (in CM).
337    This fixes the problem of CM getting confused by files that suddenly
338    change their identity (e.g., by getting unlinked and recreated by some
339    text editor such as vi).  There might be a better/cheaper/cleaner way
340    of doing this, but for now this will have to do.
341    
342    ----------------------------------------------------------------------
343    Name: Matthias Blume
344    Date: 2002/10/28 09:50:00 EST
345    Tag: blume-20021028-typecheck
346    Description:
347    
348    Exported structure Typecheck from $smlnj/viscomp/core.cm.
349    
350    ----------------------------------------------------------------------
351    Name: Matthias Blume
352    Date: 2002/10/17 09:10:00 EDT
353    Tag: Release_110_42
354    Description:
355    
356    In good old tradition, there has been a slight hiccup so that we have
357    to patch 110.42 after the fact.   The old release tag has been replaced
358    (see below).
359    
360    The change solves a problem with two competing approaches the
361    configuration problem regarding MacOS 10.1 vs. MacOS 10.2 which got in
362    each other's way.
363    
364    This change only affects the runtime system code and the installer script.
365    (No new bootfiles.)
366    
367    ----------------------------------------------------------------------
368    Name: Matthias Blume
369    Date: 2002/10/16 12:00:00 EDT
370    Tag: Release_110_42_removed
371    Description:
372    
373    New working release.  New bootfiles.
374    
375    ----------------------------------------------------------------------
376    Name: Matthias Blume
377    Date: 2002/10/10 13:10:00 EDT
378    Tag: blume-20021010-ppc-divs
379    Description:
380    
381    The mltree operator DIVS must be implemented with an overflow check on
382    the PPC because the hardware indicates divide-by-zero using "overflow" as
383    well.
384    
385    ----------------------------------------------------------------------
386    Name: Matthias Blume
387    Date: 2002/07/23 11:45:00
388    Tag: blume-20020723-smlnj-home
389    Description:
390    
391    Sml now senses the SMLNJ_HOME environment variable.  If this is set,
392    then the bin dir is assumed to be in $SMLNJ_HOME/bin and (unless
393    CM_PATHCONFIG is also set), the path configuration file is assumed
394    to be in $SMLNJ_HOME/lib/pathconfig.  This way one can easily move
395    the entire tree to some other place and everything will "just work".
396    
397    (Companion commands such as ml-build and ml-makedepend also sense this
398    variable.)
399    
400    ----------------------------------------------------------------------
401    Name: Matthias Blume
402    Date: 2002/07/12 21:19:00 EDT
403    Tag: blume-20020712-liveness
404    Description:
405    
406    Exported two useful "step" functions from liveness module (MLRISC).
407    
408    ----------------------------------------------------------------------
409    Name: Matthias Blume
410    Date: 2002/07/05 16:00 EDT
411    Tag: Release_110_41
412    Description:
413    
414    New working release.  New bootfiles.
415    
416    ----------------------------------------------------------------------
417    Name: Matthias Blume
418    Date: 2002/07/05 10:25:00 EDT
419    Tag: blume-20020705-btimp
420    Description:
421    
422    Exported structure BTImp from $smlnj/viscomp/debugprof.cm so that
423    other clients can set up backtracing support.
424    
425    ----------------------------------------------------------------------
426    Name: Matthias Blume
427    Date: 2002/06/25 17:23:00 EDT
428    Tag: blume-20020625-fpmax
429    Description:
430    
431    Fixed a bug in translation of INLMAX (and INLMIN) for the floating-point
432    case.  (The sense of the isNaN test was reversed -- which made min and
433    max always return their first argument.)
434    
435    ----------------------------------------------------------------------
436    Name: Matthias Blume
437    Date: 2002/06/11
438    Tag: blume-20020611-unixpath
439    Description:
440    
441    Back-ported OS.Path.{from,to}UnixPath from idlbasis-devel branch.
442    
443    ----------------------------------------------------------------------
444    Name: Matthias Blume
445    Date: 2002/06/10 16:35:00 EDT
446    Tag: blume-20020610-ieeereal
447    Description:
448    
449    I back-ported my implementation of IEEEReal.fromString from the
450    idlbasis-devel branch so that we can test it.
451    
452    Another small change is that ppDec tries to give more information
453    than just "<sig>" in the case of functors.  However, this code is
454    broken in some mysterious way if the functor's body's signature
455    has not been declared by ascription but gets inferred from the
456    implementation.  This needs fixing...
457    
458    ----------------------------------------------------------------------
459    Name: Matthias Blume
460    Date: 2002/05/31
461    Tag: blume-20020531-btrace-mode
462    Description:
463    
464    Resurrected SMLofNJ.Internals.BTrace.mode.  (It accidentally fell by
465    the wayside when I switched over to using Controls everywhere.)
466    
467    ----------------------------------------------------------------------
468    Name: Lal George
469    Date: 2002/05/23 12:21:40 EDT
470    Tag: george-20020523-visual-labels
471    Description:
472    
473    Labels are now displayed in the graphical output to make
474    the fall-through and target blocks obvious.
475    
476    ----------------------------------------------------------------------
477    Name: Matthias Blume
478    Date: 2002/05/22 11:03:00 EDT
479    Tag: blume-20020522-shrink
480    Description:
481    
482    John tweaked yesterday's fix for 1131 to handle an out-of-memory
483    situation that comes up when allocating huge arrays.
484    
485    ----------------------------------------------------------------------
486    Name: Matthias Blume
487    Date: 2002/05/21 16:00:00 EDT
488    Tag: Release_110_40
489    Description:
490    
491    New working release (110.40).  New bootfiles.
492    
493    [Also: John Reppy fixed GC bug 1131.]
494    
495    ----------------------------------------------------------------------
496    Name: Matthias Blume
497    Date: 2002/05/21 12:35:00 EDT
498    Tag: blume-20020521-cmdoc
499    Description:
500    
501    CM documentation update.
502    
503    ----------------------------------------------------------------------
504    Name: Matthias Blume
505    Date: 2002/05/21 10:55:00 EDT
506    Tag: blume-20020521-misc
507    Description:
508    
509    - John tweaked runtime to be silent on heap export (except when
510      GC messages are on).
511    - I added a few more things (cross-compiling versions of CMB) to
512      config/preloads (as suggestions).
513    
514    ----------------------------------------------------------------------
515    Name: Matthias Blume
516    Date: 2002/05/20 22:25:00 EDT
517    Tag: blume-20020520-controls
518    Description:
519    
520    - Added ControlUtil structure to control-lib.cm.
521    - Use it throughout.
522    - Used Controls facility to define MLRISC controls (as opposed to
523      registering MLRISC control ref cells with Controls after the fact)
524    - Fixed messed-up controls priorities.
525    
526    * Removed again all the stuff from config/preloads that one wouldn't
527      be able to preload at the time the initial heap image is built.
528      (Many libraries, e.g., CML, do not exist yet at this time.  The
529       only libraries that can be preloaded via config/preloads are those
530       that come bundled with the bootfiles.)
531    
532    ----------------------------------------------------------------------
533    Name: Matthias Blume
534    Date: 2002/05/20 10:59:00 EDT
535    Tag: blume-20020520-preloads
536    Description:
537    
538    Added a lot of commented-out suggestions for things to be included
539    in config/preloads.
540    
541    ----------------------------------------------------------------------
542    Name: Allen Leung
543    Date: 2002/05/18 14:20:00 EDT
544    Tag: leunga-20020518-mdl
545    Description:
546    
547    o Made the mdl tool stuff compile and run again.
548    o I've disabled all the stuff that depends on RTL specifications; they
549      are all badly broken anyway.
550    
551    ----------------------------------------------------------------------
552    Name: Matthias Blume
553    Date: 2002/05/17 16:49:00 EDT
554    Tag: blume-20020517-controls
555    Description:
556    
557    0. John Reppy made several modifications to the SML/NJ library.
558       In particular, there is a shiny new controls-lib.cm.
559    
560    1. Pushed new controls interface through compiler so that everything
561       compiles again.
562    
563    2. Added FormatComb and FORMAT_COMB to the CML version of the
564       SML/NJ library (so that CML compiles again).
565    
566    3. Modified init scripts because XXX_DEFAULT environment variables
567       are no longer with us.  (Boot-time initialization is now done
568       using the same environment variables that are also used for
569       startup-time initialization of controls.)
570    
571    ----------------------------------------------------------------------
572    Name: Lal George
573    Date: 2002/05/15 09:20:10 EDT
574    Tag: george-20020515-pseudo-op-decls
575    Description:
576    
577            All pseudo-ops emitted before the first segment declaration
578    such as TEXT, DATA, and BSS directives are assumed to be global
579    declarations and are emitted first in the assembly file. This is
580    useful in a number of situations where one has pseudo-ops that are not
581    specific to any segment, and also works around the constraint that one
582    cannot have client pseudo-ops in the TEXT segment.
583    
584            Because no segment is associated with these declarations it is
585    an error to allocate any space or objects before the first segment
586    directive and an exception will be raised. However, we cannot make
587    this check for client pseudo-ops.
588    
589            These top level declarations are a field in the CFG graph_info.
590    In theory you can continue to add to this field after the CFG has been
591    built -- provided you know what you are doing;-)
592    
593    ----------------------------------------------------------------------
594    Name: Matthias Blume
595    Date: 2002/05/13 16:40:00 EDT
596    Tag: blume-20020513-pp-etc
597    Description:
598    
599    A few minor bugfixes:
600    
601      - Stopgap measure for bug recently reported by Elsa Gunter (ppDec).
602        (Bogus printouts for redefined bindings still occur.  Compiler
603        bug should no longer occur now.  We need to redo the prettyprinter
604        from scratch.)
605    
606      - CM pathname printer now also adds escape sequences for ( and )
607    
608      - commend and docu fixes for ml-nlffi
609    
610    ----------------------------------------------------------------------
611    Name: Matthias Blume
612    Date: 2002/05/10 16:40:00 EDT
613    Tag: blume-20020510-erg-textio
614    Description:
615    
616    Applied the following bugfix provided by Emden Gansner:
617    
618        Output is corrupted when outputSubstr is used rather than output.
619    
620        The problem occurs when a substring
621    
622            ss = (s, dataStart, dataLen)
623    
624        where dataStart > 0, fills a stream buffer with avail bytes left.
625        avail bytes of s, starting at index dataStart, are copied into the
626        buffer, the buffer is flushed, and then the remaining dataLen-avail
627        bytes of ss are copied into the beginning of the buffer. Instead of
628        starting this copy at index dataStart+avail in s, the current code
629        starts the copy at index avail.
630    
631        Fix:
632        In text-io-fn.sml, change line 695 from
633             val needsFlush = copyVec(v, avail, dataLen-avail, buf, 0)
634        to
635             val needsFlush = copyVec(v, dataStart+avail, dataLen-avail, buf, 0)
636    
637    ----------------------------------------------------------------------
638    Name: Matthias Blume
639    Date: 2002/04/12 13:55:00 EDT
640    Tag: blume-20020412-assyntax
641    Description:
642    
643    1. Grabbed newer assyntax.h from the XFree86 project.
644    2. Fiddled with how to compile X86.prim.asm without warnings.
645    3. (Very) Minor cleanup in CM.
646    
647    ----------------------------------------------------------------------
648    Name: Matthias Blume
649    Date: 2002/04/01 (no joke!) 17:07:00 EST
650    Tag: blume-20020401-x86div
651    Description:
652    
653    Added full support for div/mod/rem/quot on the x86, using the machine
654    instruction's two results (without clumsily recomputing the remainder)
655    directly where appropriate.
656    
657    Some more extensive power-of-two support was added to the x86 instruction
658    selector (avoiding expensive divs, mods, and muls where they can be
659    replaced with cheaper shifts and masks).  However, this sort of thing
660    ought to be done earlier, e.g., within the CPS optimizer so that
661    all architectures benefit from it.
662    
663    The compiler compiles to a fixed point, but changes might be somewhat
664    fragile nevertheless.  Please, report any strange things that you might
665    see wrt. div/mod/quot/rem...
666    
667    ----------------------------------------------------------------------
668    Name: Matthias Blume
669    Date: 2002/03/29 17:22:00
670    Tag: blume-20020329-div
671    Description:
672    
673    Fixed my broken div/mod logic.  Unfortunately, this means that the
674    inline code for div/mod now has one more comparison than before.
675    Fast paths (quotient > 0 or remainder = 0) are not affected, though.
676    The problem was with quotient = 0, because that alone does not tell
677    us which way the rounding went.  One then has to look at whether
678    remainder and divisor have the same sign...  :(
679    
680    Anyway, I replaced the bootfiles with fresh ones...
681    
682    ----------------------------------------------------------------------
683    Name: Matthias Blume
684    Date: 2002/03/29 14:10:00 EST
685    Tag: blume-20020329-inlprims
686    Description:
687    
688    NEW BOOTFILES!!!    Version number bumped to 110.39.3.
689    
690    Primops have changed. This means that the bin/boot-file formats have
691    changed as well.
692    
693    To make sure that there is no confusion, I made a new version.
694    
695    
696    CHANGES:
697    
698    * removed REMT from mltree (remainder should never overflow).
699    
700    * added primops to deal with divisions of all flavors to the frontend
701    
702    * handled these primops all the way through so they map to their respective
703      MLRISC support
704    
705    * used these primops in the implementation of Int, Int32, Word, Word32
706    
707    * removed INLDIV, INLMOD, and INLREM as they are no longer necessary
708    
709    * parameterized INLMIN, INLMAX, and INLABS by a numkind
710    
711    * translate.sml now deals with all flavors of INL{MIN,MAX,ABS}, including
712      floating point
713    
714    * used INL{MIN,MAX,ABS} in the implementation of Int, Int32, Word, Word32,
715      and Real (but Real.abs maps to a separate floating-point-only primop)
716    
717    
718    TODO items:
719    
720    * Hacked Alpha32 instruction selection, disabling the selection of REMx
721      instructions because the machine instruction encoder cannot handle
722      them.  (Hppa, PPC, and Sparc instruction selection did not handle
723      REM in the first place, and REM is supported by the x86 machine coder.)
724    
725    * Handle DIV and MOD with DIV_TO_NEGINF directly in the x86 instruction
726      selection phase.  (The two can be streamlined because the hardware
727      delivers both quotient and remainder at the same time anyway.)
728    
729    * Think about what to do with "valOf(Int32.minInt) div ~1" and friends.
730      (Currently the behavior is inconsistent both across architectures and
731      wrt. the draft Basis spec.)
732    
733    * Word8 should eventually be handled natively, too.
734    
735    * There seems to be one serious bug in mltree-gen.sml.  It appears, though,
736      as if there currently is no execution path that could trigger it in
737      SML/NJ.  (The assumptions underlying functions arith and promotable do not
738      hold for things like multiplication and division.)
739    
740    ----------------------------------------------------------------------
741    Name: Matthias Blume
742    Date: 2002/03/27 16:27:00 EST
743    Tag: blume-20020327-mlrisc-divisions
744    Description:
745    
746    Added support for all four division operations (ML's div, mod, quot,
747    and rem) to MLRISC.  In the course of doing so, I also rationalized
748    the naming (no more annoying switch-around of DIV and QUOT), by
749    parameterizing the operation by div_rounding_mode (which can be either
750    DIV_TO_ZERO or DIV_TO_NEGINF).
751    
752    The generic MLTreeGen functor takes care of compiling all four
753    operations down to only round-to-zero div.
754    
755    Missing pieces:
756    
757      * Doing something smarter than relying on MLTreeGen on architectures
758        like, e.g., the x86 where hardware division delivers both quotient and
759        remainder at the same time.  With this, the implementation of the
760        round-to-neginf operations could be further streamlined.
761    
762      * Remove inlining support for div/mod/rem from the frontend and replace it
763        with primops that get carried through to the backend.  Do this for all
764        int and word types.
765    
766    ----------------------------------------------------------------------
767    Name: Matthias Blume
768    Date: 2002/03/25 17:25:00 EST
769    Tag: blume-20020325-divmod
770    Description:
771    
772    I improved (hopefully without breaking them) the implementation of Int.div,
773    Int.mod, and Int.rem.   For this, the code in translate.sml now takes
774    advantage of the following observations:
775    
776      Let  q = x quot y      r = x rem y
777           d = x div  y      m = x mod y
778    
779    where "quot" is the round-to-zero version of integer division that
780    hardware usually provides.  Then we have:
781    
782         r = x - q * y        where neither the * nor the - will overflow
783         d = if q >= 0 orelse x = q * y then q else q - 1
784                              where neither the * nor the - will overflow
785         m = if q >= 0 orelse r = 0 then r else r + y
786                              where the + will not overflow
787    
788    This results in substantial simplification of the generated code.
789    The following table shows the number of CFG nodes and edges generated
790    for
791            fun f (x, y) = x OPER y
792            (* with OPER \in div, mod, quot, rem *)
793    
794    
795        OPER | nodes(old) | edges(old) | nodes(new) | edges(new)
796        --------------------------------------------------------
797         div |         24 |         39 |         12 |         16
798         mod |         41 |         71 |         12 |         16
799        quot |          8 |         10 |          8 |         10
800         rem |         10 |         14 |          8 |         10
801    
802    
803    ----------------------------------------------------------------------
804    Name: Matthias Blume
805    Date: 2002/03/25 22:06:00 EST
806    Tag: blume-20020325-cprotobug
807    Description:
808    
809    Fixed a bug in cproto (c prototype decoder).
810    
811    ----------------------------------------------------------------------
812    Name: Matthias Blume
813    Date: 2002/03/25 16:00:00 EST
814    Tag: blume-20020325-raw-primops
815    Description:
816    
817    I did some cleanup to Allen's new primop code and
818    replaced yesterday's bootfiles with new ones.
819    (But they are stored in the same place.)
820    
821    ----------------------------------------------------------------------
822    Name: Matthias Blume
823    Date: 2002/03/24 22:40:00 EST
824    Tag: blume-20020324-bootfiles
825    Description:
826    
827    Made the bootfiles that Allen asked for.
828    
829    ----------------------------------------------------------------------
830    Name: Allen Leung
831    Date: 2002/03/23 15:50:00 EST
832    Tag: leunga-20020323-flint-cps-rcc-primops
833    Description:
834    
835      1. Changes to FLINT primops:
836    
837        (* make a call to a C-function;
838         * The primop carries C function prototype information and specifies
839         * which of its (ML-) arguments are floating point. C prototype
840         * information is for use by the backend, ML information is for
841         * use by the CPS converter. *)
842      | RAW_CCALL of { c_proto: CTypes.c_proto,
843                       ml_args: ccall_type list,
844                       ml_res_opt: ccall_type option,
845                       reentrant : bool
846                     } option
847       (* Allocate uninitialized storage on the heap.
848        * The record is meant to hold short-lived C objects, i.e., they
849        * are not ML pointers.  With the tag, the representation is
850        * the same as RECORD with tag tag_raw32 (sz=4), or tag_fblock (sz=8)
851        *)
852      | RAW_RECORD of {tag:bool,sz:int}
853      and ccall_type = CCALL_INT32 | CCALL_REAL64 | CCALL_ML_PTR
854    
855      2.  These CPS primops are now overloaded:
856    
857           rawload of {kind:numkind}
858           rawstore of {kind:numkind}
859    
860          The one argument form is:
861    
862             rawload {kind} address
863    
864          The two argument form is:
865    
866             rawload {kind} [ml object, byte-offset]
867    
868      3. RAW_CCALL/RCC now takes two extra arguments:
869    
870         a. The first is whether the C call is reentrant, i.e., whether
871            ML state should be saved and restored.
872         b. The second argument is a string argument specifying the name of
873            library and the C function.
874    
875         These things are currently not handled in the code generator, yet.
876    
877      4. In CProto,
878    
879         An encoding type of "bool" means "ml object" and is mapped into
880         C prototype of PTR.  Note that "bool" is different than "string",
881         even though "string" is also mapped into PTR, because "bool"
882         is assigned an CPS type of BOGt, while "string" is assigned INT32t.
883    
884      5. Pickler/unpicker
885    
886         Changed to handle RAW_RECORD and newest RAW_CCALL
887    
888      6. MLRiscGen,
889    
890         1. Changed to handle the new rawload/rawstore/rawrecord operators.
891         2. Code for handling C Calls has been moved to a new module CPSCCalls,
892            in the file CodeGen/cpscompile/cps-c-calls.sml
893    
894      7. Added the conditional move operator
895    
896             condmove of branch
897    
898         to cps.  Generation of this is still buggy so it is currently
899         disabled.
900    
901    ----------------------------------------------------------------------
902    Name: Lal George
903    Date: 2002/03/22 14:18:25 EST
904    Tag: george-20020322-cps-branch-prob
905    Description:
906    
907    Implemented the Ball-Larus branch prediction-heuristics, and
908    incorporated graphical viewers for control flow graphs.
909    
910    Ball-Larus Heuristics:
911    ---------------------
912    See the file compiler/CodeGen/cpscompile/cpsBranchProb.sml.
913    
914    By design it uses the Dempster-Shafer theory for combining
915    probabilities.  For example, in the function:
916    
917        fun f(n,acc) = if n = 0 then acc else f(n-1, n*acc)
918    
919    the ball-larus heuristics predicts that the n=0 is unlikely
920    (OH-heuristic), and the 'then' branch is unlikely because of the
921    RH-heuristic -- giving the 'then' branch an even lower combined
922    probability using the Dempster-Shafer theory.
923    
924    Finally, John Reppy's loop analysis in MLRISC, further lowers the
925    probability of the 'then' branch because of the loop in the else
926    branch.
927    
928    
929    Graphical Viewing:
930    ------------------
931    I merely plugged in Allen's graphical viewers into the compiler. The
932    additional code is not much. At the top level, saying:
933    
934            Control.MLRISC.getFlag "cfg-graphical-view" := true;
935    
936    will display the graphical view of the control flow graph just before
937    back-patching.  daVinci must be in your path for this to work. If
938    daVinci is not available, then the default viewer can be changed
939    using:
940    
941            Control.MLRISC.getString "viewer"
942    
943    which can be set to "dot" or "vcg" for the corresponding viewers. Of
944    course, these viewers must be in your path.
945    
946    The above will display the compilation unit at the level of clusters,
947    many of which are small, boring, and un-interesting. Also setting:
948    
949            Control.MLRISC.getInt "cfg-graphical-view_size"
950    
951    will display clusters that are larger than the value set by the above.
952    
953    
954    ----------------------------------------------------------------------
955    Name: Matthias Blume
956    Date: 2002/03/21 22:20:00 EST
957    Tag: blume-20020321-kmp-bugfix
958    Description:
959    
960    Changed the interface to the KMP routine in PreString and fixed
961    a minor bug in one place where it was used.
962    
963    ----------------------------------------------------------------------
964    Name: Allen Leung
965    Date: 2002/03/21 20:30:00 EST
966    Tag: leunga-20020321-cfg
967    Description:
968    
969      Fixed a potential problem in cfg edge splitting.
970    
971    ----------------------------------------------------------------------
972    Name: Allen Leung
973    Date: 2002/03/21 17:15:00 EST
974    Tag: leunga-20020321-x86-fp-cfg
975    Description:
976    
977      1. Recoded the buggy parts of x86-fp.
978    
979         a. All the block reordering code has been removed.
980            We now depend on the block placement phases to do this work.
981    
982         b. Critical edge splitting code has been simplified and moved into the
983            CFG modules, as where they belong.
984    
985         Both of these were quite buggy and complex.  The code is now much, much
986         simpler.
987    
988      2. X86 backend.
989    
990         a. Added instructions for 64-bit support.  Instruction selection for
991            64-bit has not been committed, however, since that
992            requires changes to MLTREE which haven't been approved by
993            Lal and John.
994    
995         b. Added support for FUCOMI and FUCOMIP when generating code for
996            PentiumPro and above.  We only generate these instructions in
997            the fast-fp mode.
998    
999         c. Added cases for JP and JNP in X86FreqProps.
1000    
1001      3. CFG
1002    
1003         CFG now has a bunch of methods for edge splitting and merging.
1004    
1005      4. Machine description.
1006    
1007         John's simplification of MLTREE_BASIS.fcond broke a few machine
1008         description things:
1009    
1010         rtl-build.{sig,sml} and hppa.mdl fixed.
1011    
1012         NOTE: the machine description stuff in the repository is still broken.
1013               Again, I can't put my fixes in because that involves
1014               changes to MLTREE.
1015    
1016    ----------------------------------------------------------------------
1017    Name: Matthias Blume
1018    Date: 2002/03/20 15:55:00 EST
1019    Tag: blume-20020320-kmp
1020    Description:
1021    
1022    Implemented Knuth-Morris-Pratt string matching in PreString and used
1023    it for String.isSubstring, Substring.isSubstring, and
1024    Substring.position.
1025    
1026    (Might need some stress-testing.  Simple examples worked fine.)
1027    
1028    ----------------------------------------------------------------------
1029    Name: Matthias Blume
1030    Date: 2002/03/19 16:37:00 EST
1031    Tag: blume-20020319-witnesses
1032    Description:
1033    
1034    Added a structure C.W and functions convert/Ptr.convert to ml-nlffi-lib.
1035    
1036    This implements a generic mechanism for changing constness qualifiers
1037    anywhere within big C types without resorting to outright "casts".
1038    (So far, functions such as C.rw/C.ro or C.Ptr.rw/C.Ptr.ro only let you
1039    modify the constness at the outermost level.)
1040    The implementation of "convert" is based on the idea of "witness"
1041    values -- values that are not used by the operation but whose types
1042    "testify" to their applicability.  On the implementation side, "convert"
1043    is simply a projection (returning its second curried argument).  With
1044    cross-module inlining, it should not result in any machine code being
1045    generated.
1046    
1047    ----------------------------------------------------------------------
1048    Name: Matthias Blume
1049    Date: 2002/03/15 16:40:00 EST
1050    Tag: blume-20020315-basis
1051    Description:
1052    
1053    Provided (preliminary?) implementations for
1054    
1055      {String,Substring}.{concatWith,isSuffix,isSubstring}
1056    
1057    and
1058    
1059      Substring.full
1060    
1061    Those are in the Basis spec but they were missing in SML/NJ.
1062    
1063    ----------------------------------------------------------------------
1064    Name: Matthias Blume
1065    Date: 2002/03/14 21:30:00 EST
1066    Tag: blume-20020314-controls
1067    Description:
1068    
1069    Controls:
1070    ---------
1071    
1072    1. Factored out the recently-added Controls : CONTROLS stuff and put
1073       it into its own library $/controls-lib.cm.  The source tree for
1074       this is under src/smlnj-lib/Controls.
1075    
1076    2. Changed the names of types and functions in this interface, so they
1077       make a bit more "sense":
1078    
1079          module -> registry
1080          'a registry -> 'a group
1081    
1082    3. The interface now deals in ref cells only.  The getter/setter interface
1083       is (mostly) gone.
1084    
1085    4. Added a function that lets one register an already-existing ref cell.
1086    
1087    5. Made the corresponding modifications to the rest of the code so that
1088       everything compiles again.
1089    
1090    6. Changed the implementation of Controls.MLRISC back to something closer
1091       to the original.  In particular, this module (and therefore MLRISC)
1092       does not depend on Controls.  There now is some link-time code in
1093       int-sys.sml that registers the MLRISC controls with the Controls
1094       module.
1095    
1096    CM:
1097    ---
1098    
1099      * One can now specify the lambda-split aggressiveness in init.cmi.
1100    
1101    ----------------------------------------------------------------------
1102    Name: Allen Leung
1103    Date: 2002/03/13 17:30:00 EST
1104    Tag: leunga-20020313-x86-fp-unary
1105    Description:
1106    
1107    Bug fix for:
1108    
1109    > leunga@weaselbane:~/Yale/tmp/sml-dist{21} bin/sml
1110    > Standard ML of New Jersey v110.39.1 [FLINT v1.5], March 08, 2002
1111    > - fun f(x,(y,z)) = Real.~ y;
1112    > [autoloading]
1113    > [autoloading done]
1114    >       fchsl   (%eax), 184(%esp)
1115    > Error: MLRisc bug: X86MCEmitter.emitInstr
1116    >
1117    > uncaught exception Error
1118    >   raised at: ../MLRISC/control/mlriscErrormsg.sml:16.14-16.19
1119    
1120    The problem was that the code generator did not generate any fp registers
1121    in this case, and the ra didn't know that it needed to run the X86FP phase to
1122    translate the pseudo fp instruction.   This only happened with unary fp
1123    operators in certain situations.
1124    
1125    ----------------------------------------------------------------------
1126    Name: Matthias Blume
1127    Date: 2002/03/13 14:00:00 EST
1128    Tag: blume-20020313-overload-etc
1129    Description:
1130    
1131    1. Added _overload as a synonym for overload for backward compatibility.
1132       (Control.overloadKW must be true for either version to be accepted.)
1133    
1134    2. Fixed bug in install script that caused more things to be installed
1135       than what was requested in config/targets.
1136    
1137    3. Made CM aware of the (_)overload construct so that autoloading
1138       works.
1139    
1140    ----------------------------------------------------------------------
1141    Name: Matthias Blume
1142    Date: 2002/03/12 22:03:00 EST
1143    Tag: blume-20020312-url
1144    Description:
1145    
1146    Forgot to update BOOT and srcarchiveurl.
1147    
1148    ----------------------------------------------------------------------
1149    Name: Matthias Blume
1150    Date: 2002/03/12 17:30:00 EST
1151    Tag: blume-20020312-version110392
1152    Description:
1153    
1154    Yet another version number bump (because of small changes to the
1155    binfile format).  Version number is now 110.39.2.  NEW BOOTFILES!
1156    
1157    Changes:
1158    
1159      The new pid generation scheme described a few weeks ago was overly
1160      complicated.  I implemented a new mechanism that is simpler and
1161      provides a bit more "stability":  Once CM has seen a compilation
1162      unit, it keeps its identity constant (as long as you do not delete
1163      those crucial CM/GUID/* files).  This means that when you change
1164      an interface, compile, then go back to the old interface, and
1165      compile again, you arrive at the original pid.
1166    
1167      There now also is a mechanism that instructs CM to use the plain
1168      environment hash as a module's pid (effectively making its GUID
1169      the empty string).  For this, "noguid" must be specified as an
1170      option to the .sml file in question within its .cm file.
1171      This is most useful for code that is being generated by tools such
1172      as ml-nlffigen (because during development programmers tend to
1173      erase the tool's entire output directory tree including CM's cached
1174      GUIDs).  "noguid" is somewhat dangerous (since it can be used to locally
1175      revert to the old, broken behavior of SML/NJ, but in specific cases
1176      where there is no danger of interface confusion, its use is ok
1177      (I think).
1178    
1179      ml-nlffigen by default generates "noguid" annotations.  They can be
1180      turned off by specifying -guid in its command line.
1181    
1182    ----------------------------------------------------------------------
1183    Name: Lal George
1184    Date: 2002/03/12 12 14:42:36 EST
1185    Tag: george-20020312-frequency-computation
1186    Description:
1187    
1188    Integrated jump chaining and static block frequency into the
1189    compiler. More details and numbers later.
1190    
1191    ----------------------------------------------------------------------
1192    Name: Lal George
1193    Date: 2002/03/11 11 22:38:53 EST
1194    Tag: george-20020311-jump-chain-elim
1195    Description:
1196    
1197    Tested the jump chain elimination on all architectures (except the
1198    hppa).  This is on by default right now and is profitable for the
1199    alpha and x86, however, it may not be profitable for the sparc and ppc
1200    when compiling the compiler.
1201    
1202    The gc test will typically jump to a label at the end of the cluster,
1203    where there is another jump to an external cluster containing the actual
1204    code to invoke gc. This is to allow factoring of common gc invocation
1205    sequences. That is to say, we generate:
1206    
1207            f:
1208               testgc
1209               ja   L1      % jump if above to L1
1210    
1211            L1:
1212               jmp L2
1213    
1214    
1215    After jump chain elimination the 'ja L1' instructions is converted to
1216    'ja L2'. On the sparc and ppc, many of the 'ja L2' instructions may end
1217    up being implemented in their long form (if L2 is far away) using:
1218    
1219            jbe     L3      % jump if below or equal to L3
1220            jmp     L2
1221         L3:
1222            ...
1223    
1224    
1225    For large compilation units L2  may be far away.
1226    
1227    
1228    ----------------------------------------------------------------------
1229    Name: Matthias Blume
1230    Date: 2002/03/11 13:30:00 EST
1231    Tag: blume-20020311-mltreeeval
1232    Description:
1233    
1234    A functor parameter was missing.
1235    
1236    ----------------------------------------------------------------------
1237    Name: Allen Leung
1238    Date: 2002/03/11 10:30:00 EST
1239    Tag: leunga-20020311-runtime-string0
1240    Description:
1241    
1242       The representation of the empty string now points to a
1243    legal null terminated C string instead of unit.  It is now possible
1244    to convert an ML string into C string with InlineT.CharVector.getData.
1245    This compiles into one single machine instruction.
1246    
1247    ----------------------------------------------------------------------
1248    Name: Allen Leung
1249    Date: 2002/03/10 23:55:00 EST
1250    Tag: leunga-20020310-x86-call
1251    Description:
1252    
1253       Added machine generation for CALL instruction (relative displacement mode)
1254    
1255    ----------------------------------------------------------------------
1256    Name: Matthias Blume
1257    Date: 2002/03/08 16:05:00
1258    Tag: blume-20020308-entrypoints
1259    Description:
1260    
1261    Version number bumped to 110.39.1.  NEW BOOTFILES!
1262    
1263    Entrypoints: non-zero offset into a code object where execution should begin.
1264    
1265    - Added the notion of an entrypoint to CodeObj.
1266    - Added reading/writing of entrypoint info to Binfile.
1267    - Made runtime system bootloader aware of entrypoints.
1268    - Use the address of the label of the first function given to mlriscGen
1269      as the entrypoint.  This address is currently always 0, but it will
1270      not be 0 once we turn on block placement.
1271    - Removed the linkage cluster code (which was The Other Way(tm) of dealing
1272      with entry points) from mlriscGen.
1273    
1274    ----------------------------------------------------------------------
1275    Name: Allen Leung
1276    Date: 2002/03/07 20:45:00 EST
1277    Tag: leunga-20020307-x86-cmov
1278    Description:
1279    
1280       Bug fixes for CMOVcc on x86.
1281    
1282       1. Added machine code generation for CMOVcc
1283       2. CMOVcc is now generated in preference over SETcc on PentiumPro or above.
1284       3. CMOVcc cannot have an immediate operand as argument.
1285    
1286    ----------------------------------------------------------------------
1287    Name: Matthias Blume
1288    Date: 2002/03/07 16:15:00 EST
1289    Tag: blume-20020307-controls
1290    Description:
1291    
1292    This is a very large but mostly boring patch which makes (almost)
1293    every tuneable compiler knob (i.e., pretty much everything under
1294    Control.* plus a few other things) configurable via both the command
1295    line and environment variables in the style CM did its configuration
1296    until now.
1297    
1298    Try starting sml with '-h' (or, if you are brave, '-H')
1299    
1300    To this end, I added a structure Controls : CONTROLS to smlnj-lib.cm which
1301    implements the underlying generic mechanism.
1302    
1303    The interface to some of the existing such facilities has changed somewhat.
1304    For example, the MLRiscControl module now provides mkFoo instead of getFoo.
1305    (The getFoo interface is still there for backward-compatibility, but its
1306    use is deprecated.)
1307    
1308    The ml-build script passes -Cxxx=yyy command-line arguments through so
1309    that one can now twiddle the compiler settings when using this "batch"
1310    compiler.
1311    
1312    TODO items:
1313    
1314    We should go through and throw out all controls that are no longer
1315    connected to anything.  Moreover, we should go through and provide
1316    meaningful (and correct!) documentation strings for those controls
1317    that still are connected.
1318    
1319    Currently, multiple calls to Controls.new are accepted (only the first
1320    has any effect).  Eventually we should make sure that every control
1321    is being made (via Controls.new) exactly once.  Future access can then
1322    be done using Controls.acc.
1323    
1324    Finally, it would probably be a good idea to use the getter-setter
1325    interface to controls rather than ref cells.  For the time being, both
1326    styles are provided by the Controls module, but getter-setter pairs are
1327    better if thread-safety is of any concern because they can be wrapped.
1328    
1329    *****************************************
1330    
1331    One bug fix: The function blockPlacement in three of the MLRISC
1332    backpatch files used to be hard-wired to one of two possibilities at
1333    link time (according to the value of the placementFlag).  But (I
1334    think) it should rather sense the flag every time.
1335    
1336    *****************************************
1337    
1338    Other assorted changes (by other people who did not supply a HISTORY entry):
1339    
1340    1. the cross-module inliner now works much better (Monnier)
1341    2. representation of weights, frequencies, and probabilities in MLRISC
1342       changed in preparation of using those for weighted block placement
1343       (Reppy, George)
1344    
1345    ----------------------------------------------------------------------
1346    Name: Lal George
1347    Date: 2002/03/07 14:44:24 EST 2002
1348    Tag: george-20020307-weighted-block-placement
1349    
1350    Tested the weighted block placement optimization on all architectures
1351    (except the hppa) using AMPL to generate the block and edge frequencies.
1352    Changes were required in the machine properties to correctly
1353    categorize trap instructions. There is an MLRISC flag
1354    "weighted-block-placement" that can be used to enable weighted block
1355    placement, but this will be ineffective without block/edge
1356    frequencies (coming soon).
1357    
1358    
1359    ----------------------------------------------------------------------
1360    Name: Lal George
1361    Date: 2002/03/05 17:24:48 EST
1362    Tag: george-20020305-linkage-cluster
1363    
1364    In order to support the block placement optimization, a new cluster
1365    is generated as the very first cluster (called the linkage cluster).
1366    It contains a single jump to the 'real' entry point for the compilation
1367    unit. Block placement has no effect on the linkage cluster itself, but
1368    all the other clusters  have full freedom in the manner in which they
1369    reorder blocks or functions.
1370    
1371    On the x86 the typical linkage code that is generated is:
1372       ----------------------
1373            .align 2
1374       L0:
1375            addl    $L1-L0, 72(%esp)
1376            jmp     L1
1377    
1378    
1379            .align  2
1380       L1:
1381       ----------------------
1382    
1383    72(%esp) is the memory location for the stdlink register. This
1384    must contain the address of the CPS function being called. In the
1385    above example, it contains the address of  L0; before
1386    calling L1 (the real entry point for the compilation unit), it
1387    must contain the address for L1, and hence
1388    
1389            addl $L1-L0, 72(%esp)
1390    
1391    I have tested this on all architectures except the hppa.The increase
1392    in code size is of course negligible
1393    
1394    ----------------------------------------------------------------------
1395    Name: Allen Leung
1396    Date: 2002/03/03 13:20:00 EST
1397    Tag: leunga-20020303-mlrisc-tools
1398    
1399      Added #[ ... ] expressions to mlrisc tools
1400    
1401    ----------------------------------------------------------------------
1402    Name: Matthias Blume
1403    Date: 2002/02/27 12:29:00 EST
1404    Tag: blume-20020227-cdebug
1405    Description:
1406    
1407    - made types in structure C and C_Debug to be equal
1408    - got rid of code duplication (c-int.sml vs. c-int-debug.sml)
1409    - there no longer is a C_Int_Debug (C_Debug is directly derived from C)
1410    
1411    ----------------------------------------------------------------------
1412    Name: Matthias Blume
1413    Date: 2002/02/26 12:00:00 EST
1414    Tag: blume-20020226-ffi
1415    Description:
1416    
1417    1. Fixed a minor bug in CM's "noweb" tool:
1418       If numbering is turned off, then truly don't number (i.e., do not
1419       supply the -L option to noweb).  The previous behavior was to supply
1420       -L'' -- which caused noweb to use the "default" line numbering scheme.
1421       Thanks to Chris Richards for pointing this out (and supplying the fix).
1422    
1423    2. Once again, I reworked some aspects of the FFI:
1424    
1425       A. The incomplete/complete type business:
1426    
1427       - Signatures POINTER_TO_INCOMPLETE_TYPE and accompanying functors are
1428         gone!
1429       - ML types representing an incomplete type are now *equal* to
1430         ML types representing their corresponding complete types (just like
1431         in C).  This is still safe because ml-nlffigen will not generate
1432         RTTI for incomplete types, nor will it generate functions that
1433         require access to such RTTI.   But when ML code generated from both
1434         incomplete and complete versions of the C type meet, the ML types
1435         are trivially interoperable.
1436    
1437         NOTE:  These changes restore the full generality of the translation
1438         (which was previously lost when I eliminated functorization)!
1439    
1440       B. Enum types:
1441    
1442       - Structure C now has a type constructor "enum" that is similar to
1443         how the "su" constructor works.  However, "enum" is not a phantom
1444         type because each "T enum" has values (and is isomorphic to
1445         MLRep.Signed.int).
1446       - There are generic access operations for enum objects (using
1447         MLRep.Signed.int).
1448       - ml-nlffigen will generate a structure E_foo for each "enum foo".
1449         * The structure contains the definition of type "mlrep" (the ML-side
1450         representation type of the enum).  Normally, mlrep is the same
1451         as "MLRep.Signed.int", but if ml-nlffigen was invoked with "-ec",
1452         then mlrep will be defined as a datatype -- thus facilitating
1453         pattern matching on mlrep values.
1454         ("-ec" will be suppressed if there are duplicate values in an
1455          enumeration.)
1456         * Constructors ("-ec") or values (no "-ec") e_xxx of type mlrep
1457         will be generated for each C enum constant xxx.
1458         * Conversion functions m2i and i2m convert between mlrep and
1459         MLRep.Signed.int.  (Without "-ec", these functions are identities.)
1460         * Coversion functions c and ml convert between mlrep and "tag enum".
1461         * Access functions (get/set) fetch and store mlrep values.
1462       - By default (unless ml-nlffigen was invoked with "-nocollect"), unnamed
1463         enumerations are merged into one single enumeration represented by
1464         structure E_'.
1465    
1466    ----------------------------------------------------------------------
1467    Name: Allen Leung
1468    Date: 2002/02/25 04:45:00 EST
1469    Tag: leunga-20020225-cps-spill
1470    
1471    This is a new implementation of the CPS spill phase.
1472    The new phase is in the new file compiler/CodeGen/cpscompile/spill-new.sml
1473    In case of problems, replace it with the old file spill.sml
1474    
1475    The current compiler runs into some serious performance problems when
1476    constructing a large record.  This can happen when we try to compile a
1477    structure with many items.  Even a very simple structure like the following
1478    makes the compiler slow down.
1479    
1480        structure Foo = struct
1481           val x_1 = 0w1 : Word32.int
1482           val x_2 = 0w2 : Word32.int
1483           val x_3 = 0w3 : Word32.int
1484           ...
1485           val x_N = 0wN : Word32.int
1486        end
1487    
1488    The following table shows the compile time, from N=1000 to N=4000,
1489    with the old compiler:
1490    
1491    N
1492    1000   CPS 100 spill                           0.04u  0.00s  0.00g
1493           MLRISC ra                               0.06u  0.00s  0.05g
1494              (spills = 0 reloads = 0)
1495           TOTAL                                   0.63u  0.07s  0.21g
1496    
1497    1100   CPS 100 spill                           8.25u  0.32s  0.64g
1498           MLRISC ra                               5.68u  0.59s  3.93g
1499              (spills = 0 reloads = 0)
1500           TOTAL                                   14.71u  0.99s  4.81g
1501    
1502    1500   CPS 100 spill                           58.55u  2.34s  1.74g
1503           MLRISC ra                               5.54u  0.65s  3.91g
1504              (spills = 543 reloads = 1082)
1505           TOTAL                                   65.40u  3.13s  6.00g
1506    
1507    2000   CPS 100 spill                           126.69u  4.84s  3.08g
1508           MLRISC ra                               0.80u  0.10s  0.55g
1509              (spills = 42 reloads = 84)
1510           TOTAL                                   129.42u  5.10s  4.13g
1511    
1512    3000   CPS 100 spill                           675.59u  19.03s  11.64g
1513           MLRISC ra                               2.69u  0.27s  1.38g
1514              (spills = 62 reloads = 124)
1515           TOTAL                                   682.48u  19.61s  13.99g
1516    
1517    4000   CPS 100 spill                           2362.82u  56.28s  43.60g
1518           MLRISC ra                               4.96u  0.27s  2.72g
1519              (spills = 85 reloads = 170)
1520           TOTAL                                   2375.26u  57.21s  48.00g
1521    
1522    As you can see the old cps spill module suffers from some serious
1523    performance problem.  But since I cannot decipher the old code fully,
1524    instead of patching the problems up, I'm reimplementing it
1525    with a different algorithm.  The new code is more modular,
1526    smaller when compiled, and substantially faster
1527    (O(n log n) time and O(n) space).  Timing of the new spill module:
1528    
1529    4000  CPS 100 spill                           0.02u  0.00s  0.00g
1530          MLRISC ra                               0.25u  0.02s  0.15g
1531             (spills=1 reloads=3)
1532          TOTAL                                   7.74u  0.34s  1.62g
1533    
1534    Implementation details:
1535    
1536    As far as I can tell, the purpose of the CPS spill module is to make sure the
1537    number of live variables at any program point (the bandwidth)
1538    does not exceed a certain limit, which is determined by the
1539    size of the spill area.
1540    
1541    When the bandwidth is too large, we decrease the register pressure by
1542    packing live variables into spill records.  How we achieve this is
1543    completely different than what we did in the old code.
1544    
1545    First, there is something about the MLRiscGen code generator
1546    that we should be aware of:
1547    
1548    o MLRiscGen performs code motion!
1549    
1550       In particular, it will move floating point computations and
1551       address computations involving only the heap pointer to
1552       their use sites (if there is only a single use).
1553       What this means is that if we have a CPS record construction
1554       statement
1555    
1556           RECORD(k,vl,w,e)
1557    
1558       we should never count the new record address w as live if w
1559       has only one use (which is often the case).
1560    
1561       We should do something similar to floating point, but the transformation
1562       there is much more complex, so I won't deal with that.
1563    
1564    Secondly, there are now two new cps primops at our disposal:
1565    
1566     1. rawrecord of record_kind option
1567        This pure operator allocates some uninitialized storage from the heap.
1568        There are two forms:
1569    
1570         rawrecord NONE [INT n]  allocates a tagless record of length n
1571         rawrecord (SOME rk) [INT n] allocates a tagged record of length n
1572                                     and initializes the tag.
1573    
1574     2. rawupdate of cty
1575          rawupdate cty (v,i,x)
1576          Assigns to x to the ith component of record v.
1577          The storelist is not updated.
1578    
1579    We use these new primops for both spilling and increment record construction.
1580    
1581     1. Spilling.
1582    
1583        This is implemented with a linear scan algorithm (but generalized
1584        to trees).  The algorithm will create a single spill record at the
1585        beginning of the cps function and use rawupdate to spill to it,
1586        and SELECT or SELp to reload from it.  So both spills and reloads
1587        are fine-grain operations.  In contrast, in the old algorithm
1588        "spills" have to be bundled together in records.
1589    
1590        Ideally, we should sink the spill record construction to where
1591        it is needed.  We can even split the spill record into multiple ones
1592        at the places where they are needed.  But CPS is not a good
1593        representation for global code motion, so I'll keep it simple and
1594        am not attempting this.
1595    
1596     2. Incremental record construction (aka record splitting).
1597    
1598        Long records with many component values which are simulatenously live
1599        (recall that single use record addresses are not considered to
1600         be live) are constructed with rawrecord and rawupdate.
1601        We allocate space on the heap with rawrecord first, then gradually
1602        fill it in with rawupdate.  This is the technique suggested to me
1603        by Matthias.
1604    
1605        Some restrictions on when this is applicable:
1606        1. It is not a VECTOR record.  The code generator currently does not handle
1607           this case. VECTOR record uses double indirection like arrays.
1608        2. All the record component values are defined in the same "basic block"
1609           as the record constructor.  This is to prevent speculative
1610           record construction.
1611    
1612    ----------------------------------------------------------------------
1613    Name: Allen Leung
1614    Date: 2002/02/22 01:02:00 EST
1615    Tag: leunga-20020222-mlrisc-tools
1616    
1617    Minor bug fixes in the parser and rewriter
1618    
1619    ----------------------------------------------------------------------
1620    Name: Allen Leung
1621    Date: 2002/02/21 20:20:00 EST
1622    Tag: leunga-20020221-peephole
1623    
1624    Regenerated the peephole files.  Some contained typos in the specification
1625    and some didn't compile because of pretty printing bugs in the old version
1626    of 'nowhere'.
1627    
1628    ----------------------------------------------------------------------
1629    Name: Allen Leung
1630    Date: 2002/02/19 20:20:00 EST
1631    Tag: leunga-20020219-mlrisc-tools
1632    Description:
1633    
1634       Minor bug fixes to the mlrisc-tools library:
1635    
1636       1.  Fixed up parsing colon suffixed keywords
1637       2.  Added the ability to shut the error messages up
1638       3.  Reimplemented the pretty printer and fixed up/improved
1639           the pretty printing of handle and -> types.
1640       4.  Fixed up generation of literal symbols in the nowhere tool.
1641       5.  Added some SML keywords to to sml.sty
1642    
1643    ----------------------------------------------------------------------
1644    Name: Matthias Blume
1645    Date: 2002/02/19 16:20:00 EST
1646    Tag: blume-20020219-cmffi
1647    Description:
1648    
1649    A wild mix of changes, some minor, some major:
1650    
1651    * All C FFI-related libraries are now anchored under $c:
1652        $/c.cm      --> $c/c.cm
1653        $/c-int.cm  --> $c/internals/c-int.cm
1654        $/memory.cm --> $c/memory/memory.cm
1655    
1656    * "make" tool (in CM) now treats its argument pathname slightly
1657      differently:
1658        1. If the native expansion is an absolute name, then before invoking
1659           the "make" command on it, CM will apply OS.Path.mkRelative
1660           (with relativeTo = OS.FileSys.getDir()) to it.
1661        2. The argument will be passed through to subsequent phases of CM
1662           processing without "going native".  In particular, if the argument
1663           was an anchored path, then "make" will not lose track of that anchor.
1664    
1665    * Compiler backends now "know" their respective C calling conventions
1666      instead of having to be told about it by ml-nlffigen.  This relieves
1667      ml-nlffigen from one of its burdens.
1668    
1669    * The X86Backend has been split into X86CCallBackend and X86StdCallBackend.
1670    
1671    * Export C_DEBUG and C_Debug from $c/c.cm.
1672    
1673    * C type encoding in ml-nlffi-lib has been improved to model the conceptual
1674      subtyping relationship between incomplete pointers and their complete
1675      counterparts.  For this, ('t, 'c) ptr has been changed to 'o ptr --
1676      with the convention of instantiating 'o with ('t, 'c) obj whenever
1677      the pointer target type is complete.  In the incomplete case, 'o
1678      will be instantiated with some "'c iobj" -- a type obtained by
1679      using one of the functors PointerToIncompleteType or PointerToCompleteType.
1680    
1681      Operations that work on both incomplete and complete pointer types are
1682      typed as taking an 'o ptr while operations that require the target to
1683      be known are typed as taking some ('t, 'c) obj ptr.
1684    
1685      voidptr is now a bit "more concrete", namely "type voidptr = void ptr'"
1686      where void is an eqtype without any values.  This makes it possible
1687      to work on voidptr values using functions meant to operate on light
1688      incomplete pointers.
1689    
1690    * As a result of the above, signature POINTER_TO_INCOMPLETE_TYPE has
1691      been vastly simplified.
1692    
1693    ----------------------------------------------------------------------
1694    Name: Matthias Blume
1695    Date: 2002/02/19 10:48:00 EST
1696    Tag: blume-20020219-pqfix
1697    Description:
1698    
1699    Applied Chris Okasaki's bug fix for priority queues.
1700    
1701    ----------------------------------------------------------------------
1702    Name: Matthias Blume
1703    Date: 2002/02/15 17:05:00
1704    Tag: Release_110_39
1705    Description:
1706    
1707    Last-minute retagging is becoming a tradition... :-(
1708    
1709    This is the working release 110.39.
1710    
1711    ----------------------------------------------------------------------
1712    Name: Matthias Blume
1713    Date: 2002/02/15 16:00:00 EST
1714    Tag: Release_110_39-orig
1715    Description:
1716    
1717    Working release 110.39.  New bootfiles.
1718    
1719    (Update: There was a small bug in the installer so it wouldn't work
1720    with all shells.  So I retagged. -Matthias)
1721    
1722    ----------------------------------------------------------------------
1723    Name: Matthias Blume
1724    Date: 2002/02/15 14:17:00 EST
1725    Tag: blume-20020215-showbindings
1726    Description:
1727    
1728    Added EnvRef.listBoundSymbols and CM.State.showBindings.  Especially
1729    the latter can be useful for exploring what bindings are available at
1730    the interactive prompt.  (The first function returns only the list
1731    of symbols that are really bound, the second prints those but also the
1732    ones that CM's autoloading mechanism knows about.)
1733    
1734    ----------------------------------------------------------------------
1735    Name: Matthias Blume
1736    Date: 2002/02/15 12:08:00 EST
1737    Tag: blume-20020215-iptrs
1738    Description:
1739    
1740    Two improvements to ml-nlffigen:
1741    
1742      1. Write files only if they do not exist or if their current contents
1743         do not coincide with what's being written.  (That is, avoid messing
1744         with the time stamps unless absolutely necessary.)
1745    
1746      2. Implement a "repository" mechanism for generated files related
1747         to "incomplete pointer types".   See the README file for details.
1748    
1749    ----------------------------------------------------------------------
1750    Name: Matthias Blume
1751    Date: 2002/02/14 11:50:00 EST
1752    Tag: blume-20020214-quote
1753    Description:
1754    
1755    Added a type 't t_' to tag.sml (in ml-nlffi-lib.cm).  This is required
1756    because of the new and improved tag generation scheme.  (Thanks to Allen
1757    Leung for pointing it out.)
1758    
1759    ----------------------------------------------------------------------
1760    Name: Lal George
1761    Date: 2002/02/14 09:55:27 EST 2002
1762    Tag: george-20020214-isabelle-bug
1763    Description:
1764    
1765    Fixed the MLRISC bug sent by Markus Wenzel regarding the compilation
1766    of Isabelle on the x86.
1767    
1768    From Allen:
1769    -----------
1770     I've found the problem:
1771    
1772         in ra-core.sml, I use the counter "blocked" to keep track of the
1773         true number of elements in the freeze queue.  When the counter goes
1774         to zero, I skip examining the queue.  But I've messed up the
1775         bookkeeping in combine():
1776    
1777             else ();
1778             case !ucol of
1779               PSEUDO => (if !cntv > 0 then
1780                     (if !cntu > 0 then blocked := !blocked - 1 else ();
1781                                        ^^^^^^^^^^^^^^^^^^^^^^^
1782                      moveu := mergeMoveList(!movev, !moveu)
1783                     )
1784                  else ();
1785    
1786         combine() is called to coalesce two nodes u and v.
1787         I think I was thinking that if the move counts of u and v are both
1788         greater than zero then after they are coalesced then one node is
1789         removed from the freeze queue.  Apparently I was thinking that
1790         both u and v are of low degree, but that's clearly not necessarily true.
1791    
1792    
1793    02/12/2002:
1794        Here's the patch.  HOL now compiles.
1795    
1796        I don't know how this impact on performance (compile
1797        time or runtime).  This bug caused the RA (especially on the x86)
1798        to go thru the potential spill phase when there are still nodes on the
1799        freeze queue.
1800    
1801    
1802    
1803    
1804    ----------------------------------------------------------------------
1805    Name: Matthias Blume
1806    Date: 2002/02/13 22:40:00 EST
1807    Tag: blume-20020213-fptr-rtti
1808    Description:
1809    
1810    Fixed a bug in ml-nlffigen that was introduced with one of the previous
1811    updates.
1812    
1813    ----------------------------------------------------------------------
1814    Name: Matthias Blume
1815    Date: 2002/02/13 16:41:00 EST
1816    Tag: blume-20020213-cmlpq
1817    Description:
1818    
1819    Added new priority queue export symbols (which have just been added to
1820    smlnj-lib.cm) to CML's version of smlnj-lib.cm.  (Otherwise CML would
1821    not compile and the installer would choke.)
1822    
1823    ----------------------------------------------------------------------
1824    Name: Matthias Blume
1825    Date: 2002/02/13 16:15:00 EST
1826    Tag: blume-20020213-various
1827    Description:
1828    
1829    1. More tweaks to ml-nlffigen:
1830    
1831       - better internal datastructures (resulting in slight speedup)
1832       - "-match" option requires exact match
1833       - "localized" gensym counters (untagged structs/unions nested within
1834         other structs/unions or within typedefs get a fresh counter; their
1835         tag will be prefixed by a concatenation of their parents' tags)
1836       - bug fixes (related to calculation of transitive closure of types
1837         to be included in the output)
1838    
1839    2. Minor Basis updates:
1840    
1841       - added implementations for List.collate and Option.app
1842    
1843    ----------------------------------------------------------------------
1844    Name: Matthias Blume
1845    Date: 2002/02/11 15:55:00 EST
1846    Tag: blume-20020211-gensym
1847    Description:
1848    
1849    Added a "-gensym" option to command line of ml-nlffigen.  This can be
1850    used to specify a "stem" -- a string that is inserted in all "gensym'd"
1851    names (ML structure names that correspond to unnamed C structs, unions,
1852    and enums), so that separate runs of ml-nlffigen do not clash.
1853    
1854    ----------------------------------------------------------------------
1855    Name: Matthias Blume
1856    Date: 2002/02/11 12:05:00 EST
1857    Tag: blume-20020211-gensml
1858    Description:
1859    
1860    A quick fix for a problem with GenSML (in the pgraph-util library):
1861    Make generation of toplevel "local" optional.  (Strictly speaking,
1862    signature definitions within "local" are not legal SML.)
1863    
1864    Other than that: updates to INSTALL and cm/TODO.
1865    
1866    ----------------------------------------------------------------------
1867    Name: Matthias Blume
1868    Date: 2002/02/08 15:00:00 EST
1869    Tag: blume-20020208-uniquepid
1870    Description:
1871    
1872    0. Version number has been bumped to 110.38.1.  NEW BOOTFILES!!!
1873    
1874    1. The installer (config/install.sh) has gotten smarter:
1875    
1876         - Configuration options are a bit easier to specify now
1877           (in config/targets).
1878         - Bug in recognizing .tar.bz2 files fixed.
1879         - Installer automatically resolves dependencies between
1880           configuration options (e.g., if you ask for eXene, you will
1881           also get cml -- regardless whether you asked for it or not).
1882         - Installer can run in "quieter mode" by setting the environment
1883           variable INSTALL_QUIETLY to "true".  "Quieter" does not mean
1884           "completely silent", though.
1885         - Build HashCons library as part of smlnj-lib.
1886    
1887    2. A new scheme for assigning persistent identifiers to compilation
1888       units (and, by extension, to types etc.) has been put into place.
1889       This fixes a long-standing bug where types and even dynamic values
1890       can get internally confused, thereby compromising type safety
1891       (abstraction) and dynamic correctness.  See
1892    
1893         http://cm.bell-labs.com/cm/cs/who/blume/pid-confusion.tgz
1894    
1895       for an example of how things could go wrong until now.
1896    
1897       The downside of the new scheme is that pids are not quite as
1898       persistent as they used to be: CM will generate a fresh pid
1899       for every compilation unit that it thinks it sees for the first
1900       time.  That means that if you compile starting from a clean, fresh
1901       source tree at two different times, you end up with different
1902       binaries.
1903    
1904       Cutoff recompilation, however, has not been compromised because
1905       CM keeps pid information in special caches between runs.
1906    
1907    ----------------------------------------------------------------------
1908    Name: Lal George
1909    Date: 2002/02/07 15:34:13 EST 2002
1910    Tag: <none>
1911    Description:
1912    
1913    Compilers that generate assembly code may produce  global labels
1914    whose value is resolved at link time. The various peephole optimization
1915    modules did not take this in account.
1916    
1917    TODO. The Labels.addrOf function should really return an option
1918    type so that clients are forced to deal with this issue, rather
1919    than an exception being raised.
1920    
1921    ----------------------------------------------------------------------
1922    Name: Lal George
1923    Date: 2002/02/06 13:55:02 EST
1924    Tag: george-20020206-ra-breakup
1925    Description:
1926    
1927    1. A bug fix from Allen.
1928    
1929        A typo causes extra fstp %st(0)'s to be generated at compensation
1930        edges, which might cause stack underflow traps at runtime.  This
1931        occurs in fft where there are extraneous fstps right before the 'into'
1932        trap instruction (in this case they are harmless since none of the
1933        integers overflow.)
1934    
1935    2. Pulled out various utility modules that were embedded in the modules
1936       of the register allocator. I need these modules for other purposes, but
1937       they are not complete enough to put into a library (just yet).
1938    ----------------------------------------------------------------------
1939  Name: Matthias Blume  Name: Matthias Blume
1940  Date: 2002/01/31 16:05:00 EST  Date: 2002/01/31 16:05:00 EST
1941  Tag: blume-20020131-sparc-ccalls  Tag: blume-20020131-sparc-ccalls
# Line 633  Line 2556 
2556    
2557  ----------------------------------------------------------------------  ----------------------------------------------------------------------
2558  Name: Matthias Blume  Name: Matthias Blume
 >>>>>>> 1.169  
2559  Date: 2001/09/18 15:35:00 EDT  Date: 2001/09/18 15:35:00 EDT
2560  Tag: blume-20010918-readme11036  Tag: blume-20010918-readme11036
2561  Description:  Description:

Legend:
Removed from v.1049  
changed lines
  Added in v.1352

root@smlnj-gforge.cs.uchicago.edu
ViewVC Help
Powered by ViewVC 1.0.0