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revision 1156, Thu Mar 21 22:01:11 2002 UTC revision 1208, Tue May 21 02:22:43 2002 UTC
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13  Description:  Description:
14    
15  ----------------------------------------------------------------------  ----------------------------------------------------------------------
16    Name: Matthias Blume
17    Date: 2002/05/20 22:25:00 EDT
18    Tag: blume-20020520-controls
19    Description:
20    
21    - Added ControlUtil structure to control-lib.cm.
22    - Use it throughout.
23    - Used Controls facility to define MLRISC controls (as opposed to
24      registering MLRISC control ref cells with Controls after the fact)
25    - Fixed messed-up controls priorities.
26    
27    * Removed again all the stuff from config/preloads that one wouldn't
28      be able to preload at the time the initial heap image is built.
29      (Many libraries, e.g., CML, do not exist yet at this time.  The
30       only libraries that can be preloaded via config/preloads are those
31       that come bundled with the bootfiles.)
32    
33    ----------------------------------------------------------------------
34    Name: Matthias Blume
35    Date: 2002/05/20 10:59:00 EDT
36    Tag: blume-20020520-preloads
37    Description:
38    
39    Added a lot of commented-out suggestions for things to be included
40    in config/preloads.
41    
42    ----------------------------------------------------------------------
43    Name: Allen Leung
44    Date: 2002/05/18 14:20:00 EDT
45    Tag: leunga-20020518-mdl
46    Description:
47    
48    o Made the mdl tool stuff compile and run again.
49    o I've disabled all the stuff that depends on RTL specifications; they
50      are all badly broken anyway.
51    
52    ----------------------------------------------------------------------
53    Name: Matthias Blume
54    Date: 2002/05/17 16:49:00 EDT
55    Tag: blume-20020517-controls
56    Description:
57    
58    0. John Reppy made several modifications to the SML/NJ library.
59       In particular, there is a shiny new controls-lib.cm.
60    
61    1. Pushed new controls interface through compiler so that everything
62       compiles again.
63    
64    2. Added FormatComb and FORMAT_COMB to the CML version of the
65       SML/NJ library (so that CML compiles again).
66    
67    3. Modified init scripts because XXX_DEFAULT environment variables
68       are no longer with us.  (Boot-time initialization is now done
69       using the same environment variables that are also used for
70       startup-time initialization of controls.)
71    
72    ----------------------------------------------------------------------
73    Name: Lal George
74    Date: 2002/05/15 09:20:10 EDT
75    Tag: george-20020515-pseudo-op-decls
76    Description:
77    
78            All pseudo-ops emitted before the first segment declaration
79    such as TEXT, DATA, and BSS directives are assumed to be global
80    declarations and are emitted first in the assembly file. This is
81    useful in a number of situations where one has pseudo-ops that are not
82    specific to any segment, and also works around the constraint that one
83    cannot have client pseudo-ops in the TEXT segment.
84    
85            Because no segment is associated with these declarations it is
86    an error to allocate any space or objects before the first segment
87    directive and an exception will be raised. However, we cannot make
88    this check for client pseudo-ops.
89    
90            These top level declarations are a field in the CFG graph_info.
91    In theory you can continue to add to this field after the CFG has been
92    built -- provided you know what you are doing;-)
93    
94    ----------------------------------------------------------------------
95    Name: Matthias Blume
96    Date: 2002/05/13 16:40:00 EDT
97    Tag: blume-20020513-pp-etc
98    Description:
99    
100    A few minor bugfixes:
101    
102      - Stopgap measure for bug recently reported by Elsa Gunter (ppDec).
103        (Bogus printouts for redefined bindings still occur.  Compiler
104        bug should no longer occur now.  We need to redo the prettyprinter
105        from scratch.)
106    
107      - CM pathname printer now also adds escape sequences for ( and )
108    
109      - commend and docu fixes for ml-nlffi
110    
111    ----------------------------------------------------------------------
112    Name: Matthias Blume
113    Date: 2002/05/10 16:40:00 EDT
114    Tag: blume-20020510-erg-textio
115    Description:
116    
117    Applied the following bugfix provided by Emden Gansner:
118    
119        Output is corrupted when outputSubstr is used rather than output.
120    
121        The problem occurs when a substring
122    
123            ss = (s, dataStart, dataLen)
124    
125        where dataStart > 0, fills a stream buffer with avail bytes left.
126        avail bytes of s, starting at index dataStart, are copied into the
127        buffer, the buffer is flushed, and then the remaining dataLen-avail
128        bytes of ss are copied into the beginning of the buffer. Instead of
129        starting this copy at index dataStart+avail in s, the current code
130        starts the copy at index avail.
131    
132        Fix:
133        In text-io-fn.sml, change line 695 from
134             val needsFlush = copyVec(v, avail, dataLen-avail, buf, 0)
135        to
136             val needsFlush = copyVec(v, dataStart+avail, dataLen-avail, buf, 0)
137    
138    ----------------------------------------------------------------------
139    Name: Matthias Blume
140    Date: 2002/04/12 13:55:00 EDT
141    Tag: blume-20020412-assyntax
142    Description:
143    
144    1. Grabbed newer assyntax.h from the XFree86 project.
145    2. Fiddled with how to compile X86.prim.asm without warnings.
146    3. (Very) Minor cleanup in CM.
147    
148    ----------------------------------------------------------------------
149    Name: Matthias Blume
150    Date: 2002/04/01 (no joke!) 17:07:00 EST
151    Tag: blume-20020401-x86div
152    Description:
153    
154    Added full support for div/mod/rem/quot on the x86, using the machine
155    instruction's two results (without clumsily recomputing the remainder)
156    directly where appropriate.
157    
158    Some more extensive power-of-two support was added to the x86 instruction
159    selector (avoiding expensive divs, mods, and muls where they can be
160    replaced with cheaper shifts and masks).  However, this sort of thing
161    ought to be done earlier, e.g., within the CPS optimizer so that
162    all architectures benefit from it.
163    
164    The compiler compiles to a fixed point, but changes might be somewhat
165    fragile nevertheless.  Please, report any strange things that you might
166    see wrt. div/mod/quot/rem...
167    
168    ----------------------------------------------------------------------
169    Name: Matthias Blume
170    Date: 2002/03/29 17:22:00
171    Tag: blume-20020329-div
172    Description:
173    
174    Fixed my broken div/mod logic.  Unfortunately, this means that the
175    inline code for div/mod now has one more comparison than before.
176    Fast paths (quotient > 0 or remainder = 0) are not affected, though.
177    The problem was with quotient = 0, because that alone does not tell
178    us which way the rounding went.  One then has to look at whether
179    remainder and divisor have the same sign...  :(
180    
181    Anyway, I replaced the bootfiles with fresh ones...
182    
183    ----------------------------------------------------------------------
184    Name: Matthias Blume
185    Date: 2002/03/29 14:10:00 EST
186    Tag: blume-20020329-inlprims
187    Description:
188    
189    NEW BOOTFILES!!!    Version number bumped to 110.39.3.
190    
191    Primops have changed. This means that the bin/boot-file formats have
192    changed as well.
193    
194    To make sure that there is no confusion, I made a new version.
195    
196    
197    CHANGES:
198    
199    * removed REMT from mltree (remainder should never overflow).
200    
201    * added primops to deal with divisions of all flavors to the frontend
202    
203    * handled these primops all the way through so they map to their respective
204      MLRISC support
205    
206    * used these primops in the implementation of Int, Int32, Word, Word32
207    
208    * removed INLDIV, INLMOD, and INLREM as they are no longer necessary
209    
210    * parameterized INLMIN, INLMAX, and INLABS by a numkind
211    
212    * translate.sml now deals with all flavors of INL{MIN,MAX,ABS}, including
213      floating point
214    
215    * used INL{MIN,MAX,ABS} in the implementation of Int, Int32, Word, Word32,
216      and Real (but Real.abs maps to a separate floating-point-only primop)
217    
218    
219    TODO items:
220    
221    * Hacked Alpha32 instruction selection, disabling the selection of REMx
222      instructions because the machine instruction encoder cannot handle
223      them.  (Hppa, PPC, and Sparc instruction selection did not handle
224      REM in the first place, and REM is supported by the x86 machine coder.)
225    
226    * Handle DIV and MOD with DIV_TO_NEGINF directly in the x86 instruction
227      selection phase.  (The two can be streamlined because the hardware
228      delivers both quotient and remainder at the same time anyway.)
229    
230    * Think about what to do with "valOf(Int32.minInt) div ~1" and friends.
231      (Currently the behavior is inconsistent both across architectures and
232      wrt. the draft Basis spec.)
233    
234    * Word8 should eventually be handled natively, too.
235    
236    * There seems to be one serious bug in mltree-gen.sml.  It appears, though,
237      as if there currently is no execution path that could trigger it in
238      SML/NJ.  (The assumptions underlying functions arith and promotable do not
239      hold for things like multiplication and division.)
240    
241    ----------------------------------------------------------------------
242    Name: Matthias Blume
243    Date: 2002/03/27 16:27:00 EST
244    Tag: blume-20020327-mlrisc-divisions
245    Description:
246    
247    Added support for all four division operations (ML's div, mod, quot,
248    and rem) to MLRISC.  In the course of doing so, I also rationalized
249    the naming (no more annoying switch-around of DIV and QUOT), by
250    parameterizing the operation by div_rounding_mode (which can be either
251    DIV_TO_ZERO or DIV_TO_NEGINF).
252    
253    The generic MLTreeGen functor takes care of compiling all four
254    operations down to only round-to-zero div.
255    
256    Missing pieces:
257    
258      * Doing something smarter than relying on MLTreeGen on architectures
259        like, e.g., the x86 where hardware division delivers both quotient and
260        remainder at the same time.  With this, the implementation of the
261        round-to-neginf operations could be further streamlined.
262    
263      * Remove inlining support for div/mod/rem from the frontend and replace it
264        with primops that get carried through to the backend.  Do this for all
265        int and word types.
266    
267    ----------------------------------------------------------------------
268    Name: Matthias Blume
269    Date: 2002/03/25 17:25:00 EST
270    Tag: blume-20020325-divmod
271    Description:
272    
273    I improved (hopefully without breaking them) the implementation of Int.div,
274    Int.mod, and Int.rem.   For this, the code in translate.sml now takes
275    advantage of the following observations:
276    
277      Let  q = x quot y      r = x rem y
278           d = x div  y      m = x mod y
279    
280    where "quot" is the round-to-zero version of integer division that
281    hardware usually provides.  Then we have:
282    
283         r = x - q * y        where neither the * nor the - will overflow
284         d = if q >= 0 orelse x = q * y then q else q - 1
285                              where neither the * nor the - will overflow
286         m = if q >= 0 orelse r = 0 then r else r + y
287                              where the + will not overflow
288    
289    This results in substantial simplification of the generated code.
290    The following table shows the number of CFG nodes and edges generated
291    for
292            fun f (x, y) = x OPER y
293            (* with OPER \in div, mod, quot, rem *)
294    
295    
296        OPER | nodes(old) | edges(old) | nodes(new) | edges(new)
297        --------------------------------------------------------
298         div |         24 |         39 |         12 |         16
299         mod |         41 |         71 |         12 |         16
300        quot |          8 |         10 |          8 |         10
301         rem |         10 |         14 |          8 |         10
302    
303    
304    ----------------------------------------------------------------------
305    Name: Matthias Blume
306    Date: 2002/03/25 22:06:00 EST
307    Tag: blume-20020325-cprotobug
308    Description:
309    
310    Fixed a bug in cproto (c prototype decoder).
311    
312    ----------------------------------------------------------------------
313    Name: Matthias Blume
314    Date: 2002/03/25 16:00:00 EST
315    Tag: blume-20020325-raw-primops
316    Description:
317    
318    I did some cleanup to Allen's new primop code and
319    replaced yesterday's bootfiles with new ones.
320    (But they are stored in the same place.)
321    
322    ----------------------------------------------------------------------
323    Name: Matthias Blume
324    Date: 2002/03/24 22:40:00 EST
325    Tag: blume-20020324-bootfiles
326    Description:
327    
328    Made the bootfiles that Allen asked for.
329    
330    ----------------------------------------------------------------------
331    Name: Allen Leung
332    Date: 2002/03/23 15:50:00 EST
333    Tag: leunga-20020323-flint-cps-rcc-primops
334    Description:
335    
336      1. Changes to FLINT primops:
337    
338        (* make a call to a C-function;
339         * The primop carries C function prototype information and specifies
340         * which of its (ML-) arguments are floating point. C prototype
341         * information is for use by the backend, ML information is for
342         * use by the CPS converter. *)
343      | RAW_CCALL of { c_proto: CTypes.c_proto,
344                       ml_args: ccall_type list,
345                       ml_res_opt: ccall_type option,
346                       reentrant : bool
347                     } option
348       (* Allocate uninitialized storage on the heap.
349        * The record is meant to hold short-lived C objects, i.e., they
350        * are not ML pointers.  With the tag, the representation is
351        * the same as RECORD with tag tag_raw32 (sz=4), or tag_fblock (sz=8)
352        *)
353      | RAW_RECORD of {tag:bool,sz:int}
354      and ccall_type = CCALL_INT32 | CCALL_REAL64 | CCALL_ML_PTR
355    
356      2.  These CPS primops are now overloaded:
357    
358           rawload of {kind:numkind}
359           rawstore of {kind:numkind}
360    
361          The one argument form is:
362    
363             rawload {kind} address
364    
365          The two argument form is:
366    
367             rawload {kind} [ml object, byte-offset]
368    
369      3. RAW_CCALL/RCC now takes two extra arguments:
370    
371         a. The first is whether the C call is reentrant, i.e., whether
372            ML state should be saved and restored.
373         b. The second argument is a string argument specifying the name of
374            library and the C function.
375    
376         These things are currently not handled in the code generator, yet.
377    
378      4. In CProto,
379    
380         An encoding type of "bool" means "ml object" and is mapped into
381         C prototype of PTR.  Note that "bool" is different than "string",
382         even though "string" is also mapped into PTR, because "bool"
383         is assigned an CPS type of BOGt, while "string" is assigned INT32t.
384    
385      5. Pickler/unpicker
386    
387         Changed to handle RAW_RECORD and newest RAW_CCALL
388    
389      6. MLRiscGen,
390    
391         1. Changed to handle the new rawload/rawstore/rawrecord operators.
392         2. Code for handling C Calls has been moved to a new module CPSCCalls,
393            in the file CodeGen/cpscompile/cps-c-calls.sml
394    
395      7. Added the conditional move operator
396    
397             condmove of branch
398    
399         to cps.  Generation of this is still buggy so it is currently
400         disabled.
401    
402    ----------------------------------------------------------------------
403    Name: Lal George
404    Date: 2002/03/22 14:18:25 EST
405    Tag: george-20020322-cps-branch-prob
406    Description:
407    
408    Implemented the Ball-Larus branch prediction-heuristics, and
409    incorporated graphical viewers for control flow graphs.
410    
411    Ball-Larus Heuristics:
412    ---------------------
413    See the file compiler/CodeGen/cpscompile/cpsBranchProb.sml.
414    
415    By design it uses the Dempster-Shafer theory for combining
416    probabilities.  For example, in the function:
417    
418        fun f(n,acc) = if n = 0 then acc else f(n-1, n*acc)
419    
420    the ball-larus heuristics predicts that the n=0 is unlikely
421    (OH-heuristic), and the 'then' branch is unlikely because of the
422    RH-heuristic -- giving the 'then' branch an even lower combined
423    probability using the Dempster-Shafer theory.
424    
425    Finally, John Reppy's loop analysis in MLRISC, further lowers the
426    probability of the 'then' branch because of the loop in the else
427    branch.
428    
429    
430    Graphical Viewing:
431    ------------------
432    I merely plugged in Allen's graphical viewers into the compiler. The
433    additional code is not much. At the top level, saying:
434    
435            Control.MLRISC.getFlag "cfg-graphical-view" := true;
436    
437    will display the graphical view of the control flow graph just before
438    back-patching.  daVinci must be in your path for this to work. If
439    daVinci is not available, then the default viewer can be changed
440    using:
441    
442            Control.MLRISC.getString "viewer"
443    
444    which can be set to "dot" or "vcg" for the corresponding viewers. Of
445    course, these viewers must be in your path.
446    
447    The above will display the compilation unit at the level of clusters,
448    many of which are small, boring, and un-interesting. Also setting:
449    
450            Control.MLRISC.getInt "cfg-graphical-view_size"
451    
452    will display clusters that are larger than the value set by the above.
453    
454    
455    ----------------------------------------------------------------------
456    Name: Matthias Blume
457    Date: 2002/03/21 22:20:00 EST
458    Tag: blume-20020321-kmp-bugfix
459    Description:
460    
461    Changed the interface to the KMP routine in PreString and fixed
462    a minor bug in one place where it was used.
463    
464    ----------------------------------------------------------------------
465    Name: Allen Leung
466    Date: 2002/03/21 20:30:00 EST
467    Tag: leunga-20020321-cfg
468    Description:
469    
470      Fixed a potential problem in cfg edge splitting.
471    
472    ----------------------------------------------------------------------
473  Name: Allen Leung  Name: Allen Leung
474  Date: 2002/03/21 17:15:00 EST  Date: 2002/03/21 17:15:00 EST
475  Tag: leunga-20020321-x86-fp-cfg  Tag: leunga-20020321-x86-fp-cfg

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