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revision 1158, Fri Mar 22 01:21:25 2002 UTC revision 1220, Wed May 22 15:04:10 2002 UTC
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13  Description:  Description:
14    
15  ----------------------------------------------------------------------  ----------------------------------------------------------------------
16    Name: Matthias Blume
17    Date: 2002/05/22 11:03:00 EDT
18    Tag: blume-20020522-shrink
19    Description:
20    
21    John tweaked yesterday's fix for 1131 to handle an out-of-memory
22    situation that comes up when allocating huge arrays.
23    
24    ----------------------------------------------------------------------
25    Name: Matthias Blume
26    Date: 2002/05/21 16:00:00 EDT
27    Tag: Release_110_40
28    Description:
29    
30    New working release (110.40).  New bootfiles.
31    
32    [Also: John Reppy fixed GC bug 1131.]
33    
34    ----------------------------------------------------------------------
35    Name: Matthias Blume
36    Date: 2002/05/21 12:35:00 EDT
37    Tag: blume-20020521-cmdoc
38    Description:
39    
40    CM documentation update.
41    
42    ----------------------------------------------------------------------
43    Name: Matthias Blume
44    Date: 2002/05/21 10:55:00 EDT
45    Tag: blume-20020521-misc
46    Description:
47    
48    - John tweaked runtime to be silent on heap export (except when
49      GC messages are on).
50    - I added a few more things (cross-compiling versions of CMB) to
51      config/preloads (as suggestions).
52    
53    ----------------------------------------------------------------------
54    Name: Matthias Blume
55    Date: 2002/05/20 22:25:00 EDT
56    Tag: blume-20020520-controls
57    Description:
58    
59    - Added ControlUtil structure to control-lib.cm.
60    - Use it throughout.
61    - Used Controls facility to define MLRISC controls (as opposed to
62      registering MLRISC control ref cells with Controls after the fact)
63    - Fixed messed-up controls priorities.
64    
65    * Removed again all the stuff from config/preloads that one wouldn't
66      be able to preload at the time the initial heap image is built.
67      (Many libraries, e.g., CML, do not exist yet at this time.  The
68       only libraries that can be preloaded via config/preloads are those
69       that come bundled with the bootfiles.)
70    
71    ----------------------------------------------------------------------
72    Name: Matthias Blume
73    Date: 2002/05/20 10:59:00 EDT
74    Tag: blume-20020520-preloads
75    Description:
76    
77    Added a lot of commented-out suggestions for things to be included
78    in config/preloads.
79    
80    ----------------------------------------------------------------------
81    Name: Allen Leung
82    Date: 2002/05/18 14:20:00 EDT
83    Tag: leunga-20020518-mdl
84    Description:
85    
86    o Made the mdl tool stuff compile and run again.
87    o I've disabled all the stuff that depends on RTL specifications; they
88      are all badly broken anyway.
89    
90    ----------------------------------------------------------------------
91    Name: Matthias Blume
92    Date: 2002/05/17 16:49:00 EDT
93    Tag: blume-20020517-controls
94    Description:
95    
96    0. John Reppy made several modifications to the SML/NJ library.
97       In particular, there is a shiny new controls-lib.cm.
98    
99    1. Pushed new controls interface through compiler so that everything
100       compiles again.
101    
102    2. Added FormatComb and FORMAT_COMB to the CML version of the
103       SML/NJ library (so that CML compiles again).
104    
105    3. Modified init scripts because XXX_DEFAULT environment variables
106       are no longer with us.  (Boot-time initialization is now done
107       using the same environment variables that are also used for
108       startup-time initialization of controls.)
109    
110    ----------------------------------------------------------------------
111    Name: Lal George
112    Date: 2002/05/15 09:20:10 EDT
113    Tag: george-20020515-pseudo-op-decls
114    Description:
115    
116            All pseudo-ops emitted before the first segment declaration
117    such as TEXT, DATA, and BSS directives are assumed to be global
118    declarations and are emitted first in the assembly file. This is
119    useful in a number of situations where one has pseudo-ops that are not
120    specific to any segment, and also works around the constraint that one
121    cannot have client pseudo-ops in the TEXT segment.
122    
123            Because no segment is associated with these declarations it is
124    an error to allocate any space or objects before the first segment
125    directive and an exception will be raised. However, we cannot make
126    this check for client pseudo-ops.
127    
128            These top level declarations are a field in the CFG graph_info.
129    In theory you can continue to add to this field after the CFG has been
130    built -- provided you know what you are doing;-)
131    
132    ----------------------------------------------------------------------
133    Name: Matthias Blume
134    Date: 2002/05/13 16:40:00 EDT
135    Tag: blume-20020513-pp-etc
136    Description:
137    
138    A few minor bugfixes:
139    
140      - Stopgap measure for bug recently reported by Elsa Gunter (ppDec).
141        (Bogus printouts for redefined bindings still occur.  Compiler
142        bug should no longer occur now.  We need to redo the prettyprinter
143        from scratch.)
144    
145      - CM pathname printer now also adds escape sequences for ( and )
146    
147      - commend and docu fixes for ml-nlffi
148    
149    ----------------------------------------------------------------------
150    Name: Matthias Blume
151    Date: 2002/05/10 16:40:00 EDT
152    Tag: blume-20020510-erg-textio
153    Description:
154    
155    Applied the following bugfix provided by Emden Gansner:
156    
157        Output is corrupted when outputSubstr is used rather than output.
158    
159        The problem occurs when a substring
160    
161            ss = (s, dataStart, dataLen)
162    
163        where dataStart > 0, fills a stream buffer with avail bytes left.
164        avail bytes of s, starting at index dataStart, are copied into the
165        buffer, the buffer is flushed, and then the remaining dataLen-avail
166        bytes of ss are copied into the beginning of the buffer. Instead of
167        starting this copy at index dataStart+avail in s, the current code
168        starts the copy at index avail.
169    
170        Fix:
171        In text-io-fn.sml, change line 695 from
172             val needsFlush = copyVec(v, avail, dataLen-avail, buf, 0)
173        to
174             val needsFlush = copyVec(v, dataStart+avail, dataLen-avail, buf, 0)
175    
176    ----------------------------------------------------------------------
177    Name: Matthias Blume
178    Date: 2002/04/12 13:55:00 EDT
179    Tag: blume-20020412-assyntax
180    Description:
181    
182    1. Grabbed newer assyntax.h from the XFree86 project.
183    2. Fiddled with how to compile X86.prim.asm without warnings.
184    3. (Very) Minor cleanup in CM.
185    
186    ----------------------------------------------------------------------
187    Name: Matthias Blume
188    Date: 2002/04/01 (no joke!) 17:07:00 EST
189    Tag: blume-20020401-x86div
190    Description:
191    
192    Added full support for div/mod/rem/quot on the x86, using the machine
193    instruction's two results (without clumsily recomputing the remainder)
194    directly where appropriate.
195    
196    Some more extensive power-of-two support was added to the x86 instruction
197    selector (avoiding expensive divs, mods, and muls where they can be
198    replaced with cheaper shifts and masks).  However, this sort of thing
199    ought to be done earlier, e.g., within the CPS optimizer so that
200    all architectures benefit from it.
201    
202    The compiler compiles to a fixed point, but changes might be somewhat
203    fragile nevertheless.  Please, report any strange things that you might
204    see wrt. div/mod/quot/rem...
205    
206    ----------------------------------------------------------------------
207    Name: Matthias Blume
208    Date: 2002/03/29 17:22:00
209    Tag: blume-20020329-div
210    Description:
211    
212    Fixed my broken div/mod logic.  Unfortunately, this means that the
213    inline code for div/mod now has one more comparison than before.
214    Fast paths (quotient > 0 or remainder = 0) are not affected, though.
215    The problem was with quotient = 0, because that alone does not tell
216    us which way the rounding went.  One then has to look at whether
217    remainder and divisor have the same sign...  :(
218    
219    Anyway, I replaced the bootfiles with fresh ones...
220    
221    ----------------------------------------------------------------------
222    Name: Matthias Blume
223    Date: 2002/03/29 14:10:00 EST
224    Tag: blume-20020329-inlprims
225    Description:
226    
227    NEW BOOTFILES!!!    Version number bumped to 110.39.3.
228    
229    Primops have changed. This means that the bin/boot-file formats have
230    changed as well.
231    
232    To make sure that there is no confusion, I made a new version.
233    
234    
235    CHANGES:
236    
237    * removed REMT from mltree (remainder should never overflow).
238    
239    * added primops to deal with divisions of all flavors to the frontend
240    
241    * handled these primops all the way through so they map to their respective
242      MLRISC support
243    
244    * used these primops in the implementation of Int, Int32, Word, Word32
245    
246    * removed INLDIV, INLMOD, and INLREM as they are no longer necessary
247    
248    * parameterized INLMIN, INLMAX, and INLABS by a numkind
249    
250    * translate.sml now deals with all flavors of INL{MIN,MAX,ABS}, including
251      floating point
252    
253    * used INL{MIN,MAX,ABS} in the implementation of Int, Int32, Word, Word32,
254      and Real (but Real.abs maps to a separate floating-point-only primop)
255    
256    
257    TODO items:
258    
259    * Hacked Alpha32 instruction selection, disabling the selection of REMx
260      instructions because the machine instruction encoder cannot handle
261      them.  (Hppa, PPC, and Sparc instruction selection did not handle
262      REM in the first place, and REM is supported by the x86 machine coder.)
263    
264    * Handle DIV and MOD with DIV_TO_NEGINF directly in the x86 instruction
265      selection phase.  (The two can be streamlined because the hardware
266      delivers both quotient and remainder at the same time anyway.)
267    
268    * Think about what to do with "valOf(Int32.minInt) div ~1" and friends.
269      (Currently the behavior is inconsistent both across architectures and
270      wrt. the draft Basis spec.)
271    
272    * Word8 should eventually be handled natively, too.
273    
274    * There seems to be one serious bug in mltree-gen.sml.  It appears, though,
275      as if there currently is no execution path that could trigger it in
276      SML/NJ.  (The assumptions underlying functions arith and promotable do not
277      hold for things like multiplication and division.)
278    
279    ----------------------------------------------------------------------
280    Name: Matthias Blume
281    Date: 2002/03/27 16:27:00 EST
282    Tag: blume-20020327-mlrisc-divisions
283    Description:
284    
285    Added support for all four division operations (ML's div, mod, quot,
286    and rem) to MLRISC.  In the course of doing so, I also rationalized
287    the naming (no more annoying switch-around of DIV and QUOT), by
288    parameterizing the operation by div_rounding_mode (which can be either
289    DIV_TO_ZERO or DIV_TO_NEGINF).
290    
291    The generic MLTreeGen functor takes care of compiling all four
292    operations down to only round-to-zero div.
293    
294    Missing pieces:
295    
296      * Doing something smarter than relying on MLTreeGen on architectures
297        like, e.g., the x86 where hardware division delivers both quotient and
298        remainder at the same time.  With this, the implementation of the
299        round-to-neginf operations could be further streamlined.
300    
301      * Remove inlining support for div/mod/rem from the frontend and replace it
302        with primops that get carried through to the backend.  Do this for all
303        int and word types.
304    
305    ----------------------------------------------------------------------
306    Name: Matthias Blume
307    Date: 2002/03/25 17:25:00 EST
308    Tag: blume-20020325-divmod
309    Description:
310    
311    I improved (hopefully without breaking them) the implementation of Int.div,
312    Int.mod, and Int.rem.   For this, the code in translate.sml now takes
313    advantage of the following observations:
314    
315      Let  q = x quot y      r = x rem y
316           d = x div  y      m = x mod y
317    
318    where "quot" is the round-to-zero version of integer division that
319    hardware usually provides.  Then we have:
320    
321         r = x - q * y        where neither the * nor the - will overflow
322         d = if q >= 0 orelse x = q * y then q else q - 1
323                              where neither the * nor the - will overflow
324         m = if q >= 0 orelse r = 0 then r else r + y
325                              where the + will not overflow
326    
327    This results in substantial simplification of the generated code.
328    The following table shows the number of CFG nodes and edges generated
329    for
330            fun f (x, y) = x OPER y
331            (* with OPER \in div, mod, quot, rem *)
332    
333    
334        OPER | nodes(old) | edges(old) | nodes(new) | edges(new)
335        --------------------------------------------------------
336         div |         24 |         39 |         12 |         16
337         mod |         41 |         71 |         12 |         16
338        quot |          8 |         10 |          8 |         10
339         rem |         10 |         14 |          8 |         10
340    
341    
342    ----------------------------------------------------------------------
343    Name: Matthias Blume
344    Date: 2002/03/25 22:06:00 EST
345    Tag: blume-20020325-cprotobug
346    Description:
347    
348    Fixed a bug in cproto (c prototype decoder).
349    
350    ----------------------------------------------------------------------
351    Name: Matthias Blume
352    Date: 2002/03/25 16:00:00 EST
353    Tag: blume-20020325-raw-primops
354    Description:
355    
356    I did some cleanup to Allen's new primop code and
357    replaced yesterday's bootfiles with new ones.
358    (But they are stored in the same place.)
359    
360    ----------------------------------------------------------------------
361    Name: Matthias Blume
362    Date: 2002/03/24 22:40:00 EST
363    Tag: blume-20020324-bootfiles
364    Description:
365    
366    Made the bootfiles that Allen asked for.
367    
368    ----------------------------------------------------------------------
369    Name: Allen Leung
370    Date: 2002/03/23 15:50:00 EST
371    Tag: leunga-20020323-flint-cps-rcc-primops
372    Description:
373    
374      1. Changes to FLINT primops:
375    
376        (* make a call to a C-function;
377         * The primop carries C function prototype information and specifies
378         * which of its (ML-) arguments are floating point. C prototype
379         * information is for use by the backend, ML information is for
380         * use by the CPS converter. *)
381      | RAW_CCALL of { c_proto: CTypes.c_proto,
382                       ml_args: ccall_type list,
383                       ml_res_opt: ccall_type option,
384                       reentrant : bool
385                     } option
386       (* Allocate uninitialized storage on the heap.
387        * The record is meant to hold short-lived C objects, i.e., they
388        * are not ML pointers.  With the tag, the representation is
389        * the same as RECORD with tag tag_raw32 (sz=4), or tag_fblock (sz=8)
390        *)
391      | RAW_RECORD of {tag:bool,sz:int}
392      and ccall_type = CCALL_INT32 | CCALL_REAL64 | CCALL_ML_PTR
393    
394      2.  These CPS primops are now overloaded:
395    
396           rawload of {kind:numkind}
397           rawstore of {kind:numkind}
398    
399          The one argument form is:
400    
401             rawload {kind} address
402    
403          The two argument form is:
404    
405             rawload {kind} [ml object, byte-offset]
406    
407      3. RAW_CCALL/RCC now takes two extra arguments:
408    
409         a. The first is whether the C call is reentrant, i.e., whether
410            ML state should be saved and restored.
411         b. The second argument is a string argument specifying the name of
412            library and the C function.
413    
414         These things are currently not handled in the code generator, yet.
415    
416      4. In CProto,
417    
418         An encoding type of "bool" means "ml object" and is mapped into
419         C prototype of PTR.  Note that "bool" is different than "string",
420         even though "string" is also mapped into PTR, because "bool"
421         is assigned an CPS type of BOGt, while "string" is assigned INT32t.
422    
423      5. Pickler/unpicker
424    
425         Changed to handle RAW_RECORD and newest RAW_CCALL
426    
427      6. MLRiscGen,
428    
429         1. Changed to handle the new rawload/rawstore/rawrecord operators.
430         2. Code for handling C Calls has been moved to a new module CPSCCalls,
431            in the file CodeGen/cpscompile/cps-c-calls.sml
432    
433      7. Added the conditional move operator
434    
435             condmove of branch
436    
437         to cps.  Generation of this is still buggy so it is currently
438         disabled.
439    
440    ----------------------------------------------------------------------
441    Name: Lal George
442    Date: 2002/03/22 14:18:25 EST
443    Tag: george-20020322-cps-branch-prob
444    Description:
445    
446    Implemented the Ball-Larus branch prediction-heuristics, and
447    incorporated graphical viewers for control flow graphs.
448    
449    Ball-Larus Heuristics:
450    ---------------------
451    See the file compiler/CodeGen/cpscompile/cpsBranchProb.sml.
452    
453    By design it uses the Dempster-Shafer theory for combining
454    probabilities.  For example, in the function:
455    
456        fun f(n,acc) = if n = 0 then acc else f(n-1, n*acc)
457    
458    the ball-larus heuristics predicts that the n=0 is unlikely
459    (OH-heuristic), and the 'then' branch is unlikely because of the
460    RH-heuristic -- giving the 'then' branch an even lower combined
461    probability using the Dempster-Shafer theory.
462    
463    Finally, John Reppy's loop analysis in MLRISC, further lowers the
464    probability of the 'then' branch because of the loop in the else
465    branch.
466    
467    
468    Graphical Viewing:
469    ------------------
470    I merely plugged in Allen's graphical viewers into the compiler. The
471    additional code is not much. At the top level, saying:
472    
473            Control.MLRISC.getFlag "cfg-graphical-view" := true;
474    
475    will display the graphical view of the control flow graph just before
476    back-patching.  daVinci must be in your path for this to work. If
477    daVinci is not available, then the default viewer can be changed
478    using:
479    
480            Control.MLRISC.getString "viewer"
481    
482    which can be set to "dot" or "vcg" for the corresponding viewers. Of
483    course, these viewers must be in your path.
484    
485    The above will display the compilation unit at the level of clusters,
486    many of which are small, boring, and un-interesting. Also setting:
487    
488            Control.MLRISC.getInt "cfg-graphical-view_size"
489    
490    will display clusters that are larger than the value set by the above.
491    
492    
493    ----------------------------------------------------------------------
494    Name: Matthias Blume
495    Date: 2002/03/21 22:20:00 EST
496    Tag: blume-20020321-kmp-bugfix
497    Description:
498    
499    Changed the interface to the KMP routine in PreString and fixed
500    a minor bug in one place where it was used.
501    
502    ----------------------------------------------------------------------
503  Name: Allen Leung  Name: Allen Leung
504  Date: 2002/03/21 20:30:00 EST  Date: 2002/03/21 20:30:00 EST
505  Tag: leunga-20020321-cfg  Tag: leunga-20020321-cfg

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