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revision 1175, Mon Mar 25 03:38:44 2002 UTC revision 1294, Thu Dec 12 21:22:48 2002 UTC
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14    
15  ----------------------------------------------------------------------  ----------------------------------------------------------------------
16  Name: Matthias Blume  Name: Matthias Blume
17    Date: 2002/12/12 16:25:00 EST
18    Tag: blume-20021212-risc-ra
19    Description:
20    
21    Fixed a serious bug in the rewrite code for FP spilling/reloading that
22    sent the RA into an infinite loop when floating point registers get
23    spilled.  (Because of this bug, e.g., nucleic stopped compiling between
24    110.37 and 110.38.)
25    There was another set of potential problems related to the handling of
26    MLRISC annotations (but those did not yet cause real problems, apparently).
27    
28    ----------------------------------------------------------------------
29    Name: Matthias Blume
30    Date: 2002/12/06 22:40:00 EST
31    Tag: blume-20021206-cm-fileid
32    Description:
33    
34    Added a call of SrcPath.sync at the beginning of Parse.parse (in CM).
35    This fixes the problem of CM getting confused by files that suddenly
36    change their identity (e.g., by getting unlinked and recreated by some
37    text editor such as vi).  There might be a better/cheaper/cleaner way
38    of doing this, but for now this will have to do.
39    
40    ----------------------------------------------------------------------
41    Name: Matthias Blume
42    Date: 2002/10/28 09:50:00 EST
43    Tag: blume-20021028-typecheck
44    Description:
45    
46    Exported structure Typecheck from $smlnj/viscomp/core.cm.
47    
48    ----------------------------------------------------------------------
49    Name: Matthias Blume
50    Date: 2002/10/17 09:10:00 EDT
51    Tag: Release_110_42
52    Description:
53    
54    In good old tradition, there has been a slight hiccup so that we have
55    to patch 110.42 after the fact.   The old release tag has been replaced
56    (see below).
57    
58    The change solves a problem with two competing approaches the
59    configuration problem regarding MacOS 10.1 vs. MacOS 10.2 which got in
60    each other's way.
61    
62    This change only affects the runtime system code and the installer script.
63    (No new bootfiles.)
64    
65    ----------------------------------------------------------------------
66    Name: Matthias Blume
67    Date: 2002/10/16 12:00:00 EDT
68    Tag: Release_110_42_removed
69    Description:
70    
71    New working release.  New bootfiles.
72    
73    ----------------------------------------------------------------------
74    Name: Matthias Blume
75    Date: 2002/10/10 13:10:00 EDT
76    Tag: blume-20021010-ppc-divs
77    Description:
78    
79    The mltree operator DIVS must be implemented with an overflow check on
80    the PPC because the hardware indicates divide-by-zero using "overflow" as
81    well.
82    
83    ----------------------------------------------------------------------
84    Name: Matthias Blume
85    Date: 2002/07/23 11:45:00
86    Tag: blume-20020723-smlnj-home
87    Description:
88    
89    Sml now senses the SMLNJ_HOME environment variable.  If this is set,
90    then the bin dir is assumed to be in $SMLNJ_HOME/bin and (unless
91    CM_PATHCONFIG is also set), the path configuration file is assumed
92    to be in $SMLNJ_HOME/lib/pathconfig.  This way one can easily move
93    the entire tree to some other place and everything will "just work".
94    
95    (Companion commands such as ml-build and ml-makedepend also sense this
96    variable.)
97    
98    ----------------------------------------------------------------------
99    Name: Matthias Blume
100    Date: 2002/07/12 21:19:00 EDT
101    Tag: blume-20020712-liveness
102    Description:
103    
104    Exported two useful "step" functions from liveness module (MLRISC).
105    
106    ----------------------------------------------------------------------
107    Name: Matthias Blume
108    Date: 2002/07/05 16:00 EDT
109    Tag: Release_110_41
110    Description:
111    
112    New working release.  New bootfiles.
113    
114    ----------------------------------------------------------------------
115    Name: Matthias Blume
116    Date: 2002/07/05 10:25:00 EDT
117    Tag: blume-20020705-btimp
118    Description:
119    
120    Exported structure BTImp from $smlnj/viscomp/debugprof.cm so that
121    other clients can set up backtracing support.
122    
123    ----------------------------------------------------------------------
124    Name: Matthias Blume
125    Date: 2002/06/25 17:23:00 EDT
126    Tag: blume-20020625-fpmax
127    Description:
128    
129    Fixed a bug in translation of INLMAX (and INLMIN) for the floating-point
130    case.  (The sense of the isNaN test was reversed -- which made min and
131    max always return their first argument.)
132    
133    ----------------------------------------------------------------------
134    Name: Matthias Blume
135    Date: 2002/06/11
136    Tag: blume-20020611-unixpath
137    Description:
138    
139    Back-ported OS.Path.{from,to}UnixPath from idlbasis-devel branch.
140    
141    ----------------------------------------------------------------------
142    Name: Matthias Blume
143    Date: 2002/06/10 16:35:00 EDT
144    Tag: blume-20020610-ieeereal
145    Description:
146    
147    I back-ported my implementation of IEEEReal.fromString from the
148    idlbasis-devel branch so that we can test it.
149    
150    Another small change is that ppDec tries to give more information
151    than just "<sig>" in the case of functors.  However, this code is
152    broken in some mysterious way if the functor's body's signature
153    has not been declared by ascription but gets inferred from the
154    implementation.  This needs fixing...
155    
156    ----------------------------------------------------------------------
157    Name: Matthias Blume
158    Date: 2002/05/31
159    Tag: blume-20020531-btrace-mode
160    Description:
161    
162    Resurrected SMLofNJ.Internals.BTrace.mode.  (It accidentally fell by
163    the wayside when I switched over to using Controls everywhere.)
164    
165    ----------------------------------------------------------------------
166    Name: Lal George
167    Date: 2002/05/23 12:21:40 EDT
168    Tag: george-20020523-visual-labels
169    Description:
170    
171    Labels are now displayed in the graphical output to make
172    the fall-through and target blocks obvious.
173    
174    ----------------------------------------------------------------------
175    Name: Matthias Blume
176    Date: 2002/05/22 11:03:00 EDT
177    Tag: blume-20020522-shrink
178    Description:
179    
180    John tweaked yesterday's fix for 1131 to handle an out-of-memory
181    situation that comes up when allocating huge arrays.
182    
183    ----------------------------------------------------------------------
184    Name: Matthias Blume
185    Date: 2002/05/21 16:00:00 EDT
186    Tag: Release_110_40
187    Description:
188    
189    New working release (110.40).  New bootfiles.
190    
191    [Also: John Reppy fixed GC bug 1131.]
192    
193    ----------------------------------------------------------------------
194    Name: Matthias Blume
195    Date: 2002/05/21 12:35:00 EDT
196    Tag: blume-20020521-cmdoc
197    Description:
198    
199    CM documentation update.
200    
201    ----------------------------------------------------------------------
202    Name: Matthias Blume
203    Date: 2002/05/21 10:55:00 EDT
204    Tag: blume-20020521-misc
205    Description:
206    
207    - John tweaked runtime to be silent on heap export (except when
208      GC messages are on).
209    - I added a few more things (cross-compiling versions of CMB) to
210      config/preloads (as suggestions).
211    
212    ----------------------------------------------------------------------
213    Name: Matthias Blume
214    Date: 2002/05/20 22:25:00 EDT
215    Tag: blume-20020520-controls
216    Description:
217    
218    - Added ControlUtil structure to control-lib.cm.
219    - Use it throughout.
220    - Used Controls facility to define MLRISC controls (as opposed to
221      registering MLRISC control ref cells with Controls after the fact)
222    - Fixed messed-up controls priorities.
223    
224    * Removed again all the stuff from config/preloads that one wouldn't
225      be able to preload at the time the initial heap image is built.
226      (Many libraries, e.g., CML, do not exist yet at this time.  The
227       only libraries that can be preloaded via config/preloads are those
228       that come bundled with the bootfiles.)
229    
230    ----------------------------------------------------------------------
231    Name: Matthias Blume
232    Date: 2002/05/20 10:59:00 EDT
233    Tag: blume-20020520-preloads
234    Description:
235    
236    Added a lot of commented-out suggestions for things to be included
237    in config/preloads.
238    
239    ----------------------------------------------------------------------
240    Name: Allen Leung
241    Date: 2002/05/18 14:20:00 EDT
242    Tag: leunga-20020518-mdl
243    Description:
244    
245    o Made the mdl tool stuff compile and run again.
246    o I've disabled all the stuff that depends on RTL specifications; they
247      are all badly broken anyway.
248    
249    ----------------------------------------------------------------------
250    Name: Matthias Blume
251    Date: 2002/05/17 16:49:00 EDT
252    Tag: blume-20020517-controls
253    Description:
254    
255    0. John Reppy made several modifications to the SML/NJ library.
256       In particular, there is a shiny new controls-lib.cm.
257    
258    1. Pushed new controls interface through compiler so that everything
259       compiles again.
260    
261    2. Added FormatComb and FORMAT_COMB to the CML version of the
262       SML/NJ library (so that CML compiles again).
263    
264    3. Modified init scripts because XXX_DEFAULT environment variables
265       are no longer with us.  (Boot-time initialization is now done
266       using the same environment variables that are also used for
267       startup-time initialization of controls.)
268    
269    ----------------------------------------------------------------------
270    Name: Lal George
271    Date: 2002/05/15 09:20:10 EDT
272    Tag: george-20020515-pseudo-op-decls
273    Description:
274    
275            All pseudo-ops emitted before the first segment declaration
276    such as TEXT, DATA, and BSS directives are assumed to be global
277    declarations and are emitted first in the assembly file. This is
278    useful in a number of situations where one has pseudo-ops that are not
279    specific to any segment, and also works around the constraint that one
280    cannot have client pseudo-ops in the TEXT segment.
281    
282            Because no segment is associated with these declarations it is
283    an error to allocate any space or objects before the first segment
284    directive and an exception will be raised. However, we cannot make
285    this check for client pseudo-ops.
286    
287            These top level declarations are a field in the CFG graph_info.
288    In theory you can continue to add to this field after the CFG has been
289    built -- provided you know what you are doing;-)
290    
291    ----------------------------------------------------------------------
292    Name: Matthias Blume
293    Date: 2002/05/13 16:40:00 EDT
294    Tag: blume-20020513-pp-etc
295    Description:
296    
297    A few minor bugfixes:
298    
299      - Stopgap measure for bug recently reported by Elsa Gunter (ppDec).
300        (Bogus printouts for redefined bindings still occur.  Compiler
301        bug should no longer occur now.  We need to redo the prettyprinter
302        from scratch.)
303    
304      - CM pathname printer now also adds escape sequences for ( and )
305    
306      - commend and docu fixes for ml-nlffi
307    
308    ----------------------------------------------------------------------
309    Name: Matthias Blume
310    Date: 2002/05/10 16:40:00 EDT
311    Tag: blume-20020510-erg-textio
312    Description:
313    
314    Applied the following bugfix provided by Emden Gansner:
315    
316        Output is corrupted when outputSubstr is used rather than output.
317    
318        The problem occurs when a substring
319    
320            ss = (s, dataStart, dataLen)
321    
322        where dataStart > 0, fills a stream buffer with avail bytes left.
323        avail bytes of s, starting at index dataStart, are copied into the
324        buffer, the buffer is flushed, and then the remaining dataLen-avail
325        bytes of ss are copied into the beginning of the buffer. Instead of
326        starting this copy at index dataStart+avail in s, the current code
327        starts the copy at index avail.
328    
329        Fix:
330        In text-io-fn.sml, change line 695 from
331             val needsFlush = copyVec(v, avail, dataLen-avail, buf, 0)
332        to
333             val needsFlush = copyVec(v, dataStart+avail, dataLen-avail, buf, 0)
334    
335    ----------------------------------------------------------------------
336    Name: Matthias Blume
337    Date: 2002/04/12 13:55:00 EDT
338    Tag: blume-20020412-assyntax
339    Description:
340    
341    1. Grabbed newer assyntax.h from the XFree86 project.
342    2. Fiddled with how to compile X86.prim.asm without warnings.
343    3. (Very) Minor cleanup in CM.
344    
345    ----------------------------------------------------------------------
346    Name: Matthias Blume
347    Date: 2002/04/01 (no joke!) 17:07:00 EST
348    Tag: blume-20020401-x86div
349    Description:
350    
351    Added full support for div/mod/rem/quot on the x86, using the machine
352    instruction's two results (without clumsily recomputing the remainder)
353    directly where appropriate.
354    
355    Some more extensive power-of-two support was added to the x86 instruction
356    selector (avoiding expensive divs, mods, and muls where they can be
357    replaced with cheaper shifts and masks).  However, this sort of thing
358    ought to be done earlier, e.g., within the CPS optimizer so that
359    all architectures benefit from it.
360    
361    The compiler compiles to a fixed point, but changes might be somewhat
362    fragile nevertheless.  Please, report any strange things that you might
363    see wrt. div/mod/quot/rem...
364    
365    ----------------------------------------------------------------------
366    Name: Matthias Blume
367    Date: 2002/03/29 17:22:00
368    Tag: blume-20020329-div
369    Description:
370    
371    Fixed my broken div/mod logic.  Unfortunately, this means that the
372    inline code for div/mod now has one more comparison than before.
373    Fast paths (quotient > 0 or remainder = 0) are not affected, though.
374    The problem was with quotient = 0, because that alone does not tell
375    us which way the rounding went.  One then has to look at whether
376    remainder and divisor have the same sign...  :(
377    
378    Anyway, I replaced the bootfiles with fresh ones...
379    
380    ----------------------------------------------------------------------
381    Name: Matthias Blume
382    Date: 2002/03/29 14:10:00 EST
383    Tag: blume-20020329-inlprims
384    Description:
385    
386    NEW BOOTFILES!!!    Version number bumped to 110.39.3.
387    
388    Primops have changed. This means that the bin/boot-file formats have
389    changed as well.
390    
391    To make sure that there is no confusion, I made a new version.
392    
393    
394    CHANGES:
395    
396    * removed REMT from mltree (remainder should never overflow).
397    
398    * added primops to deal with divisions of all flavors to the frontend
399    
400    * handled these primops all the way through so they map to their respective
401      MLRISC support
402    
403    * used these primops in the implementation of Int, Int32, Word, Word32
404    
405    * removed INLDIV, INLMOD, and INLREM as they are no longer necessary
406    
407    * parameterized INLMIN, INLMAX, and INLABS by a numkind
408    
409    * translate.sml now deals with all flavors of INL{MIN,MAX,ABS}, including
410      floating point
411    
412    * used INL{MIN,MAX,ABS} in the implementation of Int, Int32, Word, Word32,
413      and Real (but Real.abs maps to a separate floating-point-only primop)
414    
415    
416    TODO items:
417    
418    * Hacked Alpha32 instruction selection, disabling the selection of REMx
419      instructions because the machine instruction encoder cannot handle
420      them.  (Hppa, PPC, and Sparc instruction selection did not handle
421      REM in the first place, and REM is supported by the x86 machine coder.)
422    
423    * Handle DIV and MOD with DIV_TO_NEGINF directly in the x86 instruction
424      selection phase.  (The two can be streamlined because the hardware
425      delivers both quotient and remainder at the same time anyway.)
426    
427    * Think about what to do with "valOf(Int32.minInt) div ~1" and friends.
428      (Currently the behavior is inconsistent both across architectures and
429      wrt. the draft Basis spec.)
430    
431    * Word8 should eventually be handled natively, too.
432    
433    * There seems to be one serious bug in mltree-gen.sml.  It appears, though,
434      as if there currently is no execution path that could trigger it in
435      SML/NJ.  (The assumptions underlying functions arith and promotable do not
436      hold for things like multiplication and division.)
437    
438    ----------------------------------------------------------------------
439    Name: Matthias Blume
440    Date: 2002/03/27 16:27:00 EST
441    Tag: blume-20020327-mlrisc-divisions
442    Description:
443    
444    Added support for all four division operations (ML's div, mod, quot,
445    and rem) to MLRISC.  In the course of doing so, I also rationalized
446    the naming (no more annoying switch-around of DIV and QUOT), by
447    parameterizing the operation by div_rounding_mode (which can be either
448    DIV_TO_ZERO or DIV_TO_NEGINF).
449    
450    The generic MLTreeGen functor takes care of compiling all four
451    operations down to only round-to-zero div.
452    
453    Missing pieces:
454    
455      * Doing something smarter than relying on MLTreeGen on architectures
456        like, e.g., the x86 where hardware division delivers both quotient and
457        remainder at the same time.  With this, the implementation of the
458        round-to-neginf operations could be further streamlined.
459    
460      * Remove inlining support for div/mod/rem from the frontend and replace it
461        with primops that get carried through to the backend.  Do this for all
462        int and word types.
463    
464    ----------------------------------------------------------------------
465    Name: Matthias Blume
466    Date: 2002/03/25 17:25:00 EST
467    Tag: blume-20020325-divmod
468    Description:
469    
470    I improved (hopefully without breaking them) the implementation of Int.div,
471    Int.mod, and Int.rem.   For this, the code in translate.sml now takes
472    advantage of the following observations:
473    
474      Let  q = x quot y      r = x rem y
475           d = x div  y      m = x mod y
476    
477    where "quot" is the round-to-zero version of integer division that
478    hardware usually provides.  Then we have:
479    
480         r = x - q * y        where neither the * nor the - will overflow
481         d = if q >= 0 orelse x = q * y then q else q - 1
482                              where neither the * nor the - will overflow
483         m = if q >= 0 orelse r = 0 then r else r + y
484                              where the + will not overflow
485    
486    This results in substantial simplification of the generated code.
487    The following table shows the number of CFG nodes and edges generated
488    for
489            fun f (x, y) = x OPER y
490            (* with OPER \in div, mod, quot, rem *)
491    
492    
493        OPER | nodes(old) | edges(old) | nodes(new) | edges(new)
494        --------------------------------------------------------
495         div |         24 |         39 |         12 |         16
496         mod |         41 |         71 |         12 |         16
497        quot |          8 |         10 |          8 |         10
498         rem |         10 |         14 |          8 |         10
499    
500    
501    ----------------------------------------------------------------------
502    Name: Matthias Blume
503    Date: 2002/03/25 22:06:00 EST
504    Tag: blume-20020325-cprotobug
505    Description:
506    
507    Fixed a bug in cproto (c prototype decoder).
508    
509    ----------------------------------------------------------------------
510    Name: Matthias Blume
511    Date: 2002/03/25 16:00:00 EST
512    Tag: blume-20020325-raw-primops
513    Description:
514    
515    I did some cleanup to Allen's new primop code and
516    replaced yesterday's bootfiles with new ones.
517    (But they are stored in the same place.)
518    
519    ----------------------------------------------------------------------
520    Name: Matthias Blume
521  Date: 2002/03/24 22:40:00 EST  Date: 2002/03/24 22:40:00 EST
522  Tag: blume-20020324-bootfiles  Tag: blume-20020324-bootfiles
523  Description:  Description:

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