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Diff of /sml/trunk/HISTORY

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revision 1115, Sun Mar 3 18:16:31 2002 UTC revision 1174, Sat Mar 23 21:14:40 2002 UTC
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14    
15  ----------------------------------------------------------------------  ----------------------------------------------------------------------
16  Name: Allen Leung  Name: Allen Leung
17    Date: 2002/03/23 15:50:00 EST
18    Tag: leunga-20020323-flint-cps-rcc-primops
19    Description:
20    
21      1. Changes to FLINT primops:
22    
23        (* make a call to a C-function;
24         * The primop carries C function prototype information and specifies
25         * which of its (ML-) arguments are floating point. C prototype
26         * information is for use by the backend, ML information is for
27         * use by the CPS converter. *)
28      | RAW_CCALL of { c_proto: CTypes.c_proto,
29                       ml_args: ccall_type list,
30                       ml_res_opt: ccall_type option,
31                       reentrant : bool
32                     } option
33       (* Allocate uninitialized storage on the heap.
34        * The record is meant to hold short-lived C objects, i.e., they
35        * are not ML pointers.  With the tag, the representation is
36        * the same as RECORD with tag tag_raw32 (sz=4), or tag_fblock (sz=8)
37        *)
38      | RAW_RECORD of {tag:bool,sz:int}
39      and ccall_type = CCALL_INT32 | CCALL_REAL64 | CCALL_ML_PTR
40    
41      2.  These CPS primops are now overloaded:
42    
43           rawload of {kind:numkind}
44           rawstore of {kind:numkind}
45    
46          The one argument form is:
47    
48             rawload {kind} address
49    
50          The two argument form is:
51    
52             rawload {kind} [ml object, byte-offset]
53    
54      3. RAW_CCALL/RCC now takes two extra arguments:
55    
56         a. The first is whether the C call is reentrant, i.e., whether
57            ML state should be saved and restored.
58         b. The second argument is a string argument specifying the name of
59            library and the C function.
60    
61         These things are currently not handled in the code generator, yet.
62    
63      4. In CProto,
64    
65         An encoding type of "bool" means "ml object" and is mapped into
66         C prototype of PTR.  Note that "bool" is different than "string",
67         even though "string" is also mapped into PTR, because "bool"
68         is assigned an CPS type of BOGt, while "string" is assigned INT32t.
69    
70      5. Pickler/unpicker
71    
72         Changed to handle RAW_RECORD and newest RAW_CCALL
73    
74      6. MLRiscGen,
75    
76         1. Changed to handle the new rawload/rawstore/rawrecord operators.
77         2. Code for handling C Calls has been moved to a new module CPSCCalls,
78            in the file CodeGen/cpscompile/cps-c-calls.sml
79    
80      7. Added the conditional move operator
81    
82             condmove of branch
83    
84         to cps.  Generation of this is still buggy so it is currently
85         disabled.
86    
87    ----------------------------------------------------------------------
88    Name: Lal George
89    Date: 2002/03/22 14:18:25 EST
90    Tag: george-20020322-cps-branch-prob
91    Description:
92    
93    Implemented the Ball-Larus branch prediction-heuristics, and
94    incorporated graphical viewers for control flow graphs.
95    
96    Ball-Larus Heuristics:
97    ---------------------
98    See the file compiler/CodeGen/cpscompile/cpsBranchProb.sml.
99    
100    By design it uses the Dempster-Shafer theory for combining
101    probabilities.  For example, in the function:
102    
103        fun f(n,acc) = if n = 0 then acc else f(n-1, n*acc)
104    
105    the ball-larus heuristics predicts that the n=0 is unlikely
106    (OH-heuristic), and the 'then' branch is unlikely because of the
107    RH-heuristic -- giving the 'then' branch an even lower combined
108    probability using the Dempster-Shafer theory.
109    
110    Finally, John Reppy's loop analysis in MLRISC, further lowers the
111    probability of the 'then' branch because of the loop in the else
112    branch.
113    
114    
115    Graphical Viewing:
116    ------------------
117    I merely plugged in Allen's graphical viewers into the compiler. The
118    additional code is not much. At the top level, saying:
119    
120            Control.MLRISC.getFlag "cfg-graphical-view" := true;
121    
122    will display the graphical view of the control flow graph just before
123    back-patching.  daVinci must be in your path for this to work. If
124    daVinci is not available, then the default viewer can be changed
125    using:
126    
127            Control.MLRISC.getString "viewer"
128    
129    which can be set to "dot" or "vcg" for the corresponding viewers. Of
130    course, these viewers must be in your path.
131    
132    The above will display the compilation unit at the level of clusters,
133    many of which are small, boring, and un-interesting. Also setting:
134    
135            Control.MLRISC.getInt "cfg-graphical-view_size"
136    
137    will display clusters that are larger than the value set by the above.
138    
139    
140    ----------------------------------------------------------------------
141    Name: Matthias Blume
142    Date: 2002/03/21 22:20:00 EST
143    Tag: blume-20020321-kmp-bugfix
144    Description:
145    
146    Changed the interface to the KMP routine in PreString and fixed
147    a minor bug in one place where it was used.
148    
149    ----------------------------------------------------------------------
150    Name: Allen Leung
151    Date: 2002/03/21 20:30:00 EST
152    Tag: leunga-20020321-cfg
153    Description:
154    
155      Fixed a potential problem in cfg edge splitting.
156    
157    ----------------------------------------------------------------------
158    Name: Allen Leung
159    Date: 2002/03/21 17:15:00 EST
160    Tag: leunga-20020321-x86-fp-cfg
161    Description:
162    
163      1. Recoded the buggy parts of x86-fp.
164    
165         a. All the block reordering code has been removed.
166            We now depend on the block placement phases to do this work.
167    
168         b. Critical edge splitting code has been simplified and moved into the
169            CFG modules, as where they belong.
170    
171         Both of these were quite buggy and complex.  The code is now much, much
172         simpler.
173    
174      2. X86 backend.
175    
176         a. Added instructions for 64-bit support.  Instruction selection for
177            64-bit has not been committed, however, since that
178            requires changes to MLTREE which haven't been approved by
179            Lal and John.
180    
181         b. Added support for FUCOMI and FUCOMIP when generating code for
182            PentiumPro and above.  We only generate these instructions in
183            the fast-fp mode.
184    
185         c. Added cases for JP and JNP in X86FreqProps.
186    
187      3. CFG
188    
189         CFG now has a bunch of methods for edge splitting and merging.
190    
191      4. Machine description.
192    
193         John's simplification of MLTREE_BASIS.fcond broke a few machine
194         description things:
195    
196         rtl-build.{sig,sml} and hppa.mdl fixed.
197    
198         NOTE: the machine description stuff in the repository is still broken.
199               Again, I can't put my fixes in because that involves
200               changes to MLTREE.
201    
202    ----------------------------------------------------------------------
203    Name: Matthias Blume
204    Date: 2002/03/20 15:55:00 EST
205    Tag: blume-20020320-kmp
206    Description:
207    
208    Implemented Knuth-Morris-Pratt string matching in PreString and used
209    it for String.isSubstring, Substring.isSubstring, and
210    Substring.position.
211    
212    (Might need some stress-testing.  Simple examples worked fine.)
213    
214    ----------------------------------------------------------------------
215    Name: Matthias Blume
216    Date: 2002/03/19 16:37:00 EST
217    Tag: blume-20020319-witnesses
218    Description:
219    
220    Added a structure C.W and functions convert/Ptr.convert to ml-nlffi-lib.
221    
222    This implements a generic mechanism for changing constness qualifiers
223    anywhere within big C types without resorting to outright "casts".
224    (So far, functions such as C.rw/C.ro or C.Ptr.rw/C.Ptr.ro only let you
225    modify the constness at the outermost level.)
226    The implementation of "convert" is based on the idea of "witness"
227    values -- values that are not used by the operation but whose types
228    "testify" to their applicability.  On the implementation side, "convert"
229    is simply a projection (returning its second curried argument).  With
230    cross-module inlining, it should not result in any machine code being
231    generated.
232    
233    ----------------------------------------------------------------------
234    Name: Matthias Blume
235    Date: 2002/03/15 16:40:00 EST
236    Tag: blume-20020315-basis
237    Description:
238    
239    Provided (preliminary?) implementations for
240    
241      {String,Substring}.{concatWith,isSuffix,isSubstring}
242    
243    and
244    
245      Substring.full
246    
247    Those are in the Basis spec but they were missing in SML/NJ.
248    
249    ----------------------------------------------------------------------
250    Name: Matthias Blume
251    Date: 2002/03/14 21:30:00 EST
252    Tag: blume-20020314-controls
253    Description:
254    
255    Controls:
256    ---------
257    
258    1. Factored out the recently-added Controls : CONTROLS stuff and put
259       it into its own library $/controls-lib.cm.  The source tree for
260       this is under src/smlnj-lib/Controls.
261    
262    2. Changed the names of types and functions in this interface, so they
263       make a bit more "sense":
264    
265          module -> registry
266          'a registry -> 'a group
267    
268    3. The interface now deals in ref cells only.  The getter/setter interface
269       is (mostly) gone.
270    
271    4. Added a function that lets one register an already-existing ref cell.
272    
273    5. Made the corresponding modifications to the rest of the code so that
274       everything compiles again.
275    
276    6. Changed the implementation of Controls.MLRISC back to something closer
277       to the original.  In particular, this module (and therefore MLRISC)
278       does not depend on Controls.  There now is some link-time code in
279       int-sys.sml that registers the MLRISC controls with the Controls
280       module.
281    
282    CM:
283    ---
284    
285      * One can now specify the lambda-split aggressiveness in init.cmi.
286    
287    ----------------------------------------------------------------------
288    Name: Allen Leung
289    Date: 2002/03/13 17:30:00 EST
290    Tag: leunga-20020313-x86-fp-unary
291    Description:
292    
293    Bug fix for:
294    
295    > leunga@weaselbane:~/Yale/tmp/sml-dist{21} bin/sml
296    > Standard ML of New Jersey v110.39.1 [FLINT v1.5], March 08, 2002
297    > - fun f(x,(y,z)) = Real.~ y;
298    > [autoloading]
299    > [autoloading done]
300    >       fchsl   (%eax), 184(%esp)
301    > Error: MLRisc bug: X86MCEmitter.emitInstr
302    >
303    > uncaught exception Error
304    >   raised at: ../MLRISC/control/mlriscErrormsg.sml:16.14-16.19
305    
306    The problem was that the code generator did not generate any fp registers
307    in this case, and the ra didn't know that it needed to run the X86FP phase to
308    translate the pseudo fp instruction.   This only happened with unary fp
309    operators in certain situations.
310    
311    ----------------------------------------------------------------------
312    Name: Matthias Blume
313    Date: 2002/03/13 14:00:00 EST
314    Tag: blume-20020313-overload-etc
315    Description:
316    
317    1. Added _overload as a synonym for overload for backward compatibility.
318       (Control.overloadKW must be true for either version to be accepted.)
319    
320    2. Fixed bug in install script that caused more things to be installed
321       than what was requested in config/targets.
322    
323    3. Made CM aware of the (_)overload construct so that autoloading
324       works.
325    
326    ----------------------------------------------------------------------
327    Name: Matthias Blume
328    Date: 2002/03/12 22:03:00 EST
329    Tag: blume-20020312-url
330    Description:
331    
332    Forgot to update BOOT and srcarchiveurl.
333    
334    ----------------------------------------------------------------------
335    Name: Matthias Blume
336    Date: 2002/03/12 17:30:00 EST
337    Tag: blume-20020312-version110392
338    Description:
339    
340    Yet another version number bump (because of small changes to the
341    binfile format).  Version number is now 110.39.2.  NEW BOOTFILES!
342    
343    Changes:
344    
345      The new pid generation scheme described a few weeks ago was overly
346      complicated.  I implemented a new mechanism that is simpler and
347      provides a bit more "stability":  Once CM has seen a compilation
348      unit, it keeps its identity constant (as long as you do not delete
349      those crucial CM/GUID/* files).  This means that when you change
350      an interface, compile, then go back to the old interface, and
351      compile again, you arrive at the original pid.
352    
353      There now also is a mechanism that instructs CM to use the plain
354      environment hash as a module's pid (effectively making its GUID
355      the empty string).  For this, "noguid" must be specified as an
356      option to the .sml file in question within its .cm file.
357      This is most useful for code that is being generated by tools such
358      as ml-nlffigen (because during development programmers tend to
359      erase the tool's entire output directory tree including CM's cached
360      GUIDs).  "noguid" is somewhat dangerous (since it can be used to locally
361      revert to the old, broken behavior of SML/NJ, but in specific cases
362      where there is no danger of interface confusion, its use is ok
363      (I think).
364    
365      ml-nlffigen by default generates "noguid" annotations.  They can be
366      turned off by specifying -guid in its command line.
367    
368    ----------------------------------------------------------------------
369    Name: Lal George
370    Date: 2002/03/12 12 14:42:36 EST
371    Tag: george-20020312-frequency-computation
372    Description:
373    
374    Integrated jump chaining and static block frequency into the
375    compiler. More details and numbers later.
376    
377    ----------------------------------------------------------------------
378    Name: Lal George
379    Date: 2002/03/11 11 22:38:53 EST
380    Tag: george-20020311-jump-chain-elim
381    Description:
382    
383    Tested the jump chain elimination on all architectures (except the
384    hppa).  This is on by default right now and is profitable for the
385    alpha and x86, however, it may not be profitable for the sparc and ppc
386    when compiling the compiler.
387    
388    The gc test will typically jump to a label at the end of the cluster,
389    where there is another jump to an external cluster containing the actual
390    code to invoke gc. This is to allow factoring of common gc invocation
391    sequences. That is to say, we generate:
392    
393            f:
394               testgc
395               ja   L1      % jump if above to L1
396    
397            L1:
398               jmp L2
399    
400    
401    After jump chain elimination the 'ja L1' instructions is converted to
402    'ja L2'. On the sparc and ppc, many of the 'ja L2' instructions may end
403    up being implemented in their long form (if L2 is far away) using:
404    
405            jbe     L3      % jump if below or equal to L3
406            jmp     L2
407         L3:
408            ...
409    
410    
411    For large compilation units L2  may be far away.
412    
413    
414    ----------------------------------------------------------------------
415    Name: Matthias Blume
416    Date: 2002/03/11 13:30:00 EST
417    Tag: blume-20020311-mltreeeval
418    Description:
419    
420    A functor parameter was missing.
421    
422    ----------------------------------------------------------------------
423    Name: Allen Leung
424    Date: 2002/03/11 10:30:00 EST
425    Tag: leunga-20020311-runtime-string0
426    Description:
427    
428       The representation of the empty string now points to a
429    legal null terminated C string instead of unit.  It is now possible
430    to convert an ML string into C string with InlineT.CharVector.getData.
431    This compiles into one single machine instruction.
432    
433    ----------------------------------------------------------------------
434    Name: Allen Leung
435    Date: 2002/03/10 23:55:00 EST
436    Tag: leunga-20020310-x86-call
437    Description:
438    
439       Added machine generation for CALL instruction (relative displacement mode)
440    
441    ----------------------------------------------------------------------
442    Name: Matthias Blume
443    Date: 2002/03/08 16:05:00
444    Tag: blume-20020308-entrypoints
445    Description:
446    
447    Version number bumped to 110.39.1.  NEW BOOTFILES!
448    
449    Entrypoints: non-zero offset into a code object where execution should begin.
450    
451    - Added the notion of an entrypoint to CodeObj.
452    - Added reading/writing of entrypoint info to Binfile.
453    - Made runtime system bootloader aware of entrypoints.
454    - Use the address of the label of the first function given to mlriscGen
455      as the entrypoint.  This address is currently always 0, but it will
456      not be 0 once we turn on block placement.
457    - Removed the linkage cluster code (which was The Other Way(tm) of dealing
458      with entry points) from mlriscGen.
459    
460    ----------------------------------------------------------------------
461    Name: Allen Leung
462    Date: 2002/03/07 20:45:00 EST
463    Tag: leunga-20020307-x86-cmov
464    Description:
465    
466       Bug fixes for CMOVcc on x86.
467    
468       1. Added machine code generation for CMOVcc
469       2. CMOVcc is now generated in preference over SETcc on PentiumPro or above.
470       3. CMOVcc cannot have an immediate operand as argument.
471    
472    ----------------------------------------------------------------------
473    Name: Matthias Blume
474    Date: 2002/03/07 16:15:00 EST
475    Tag: blume-20020307-controls
476    Description:
477    
478    This is a very large but mostly boring patch which makes (almost)
479    every tuneable compiler knob (i.e., pretty much everything under
480    Control.* plus a few other things) configurable via both the command
481    line and environment variables in the style CM did its configuration
482    until now.
483    
484    Try starting sml with '-h' (or, if you are brave, '-H')
485    
486    To this end, I added a structure Controls : CONTROLS to smlnj-lib.cm which
487    implements the underlying generic mechanism.
488    
489    The interface to some of the existing such facilities has changed somewhat.
490    For example, the MLRiscControl module now provides mkFoo instead of getFoo.
491    (The getFoo interface is still there for backward-compatibility, but its
492    use is deprecated.)
493    
494    The ml-build script passes -Cxxx=yyy command-line arguments through so
495    that one can now twiddle the compiler settings when using this "batch"
496    compiler.
497    
498    TODO items:
499    
500    We should go through and throw out all controls that are no longer
501    connected to anything.  Moreover, we should go through and provide
502    meaningful (and correct!) documentation strings for those controls
503    that still are connected.
504    
505    Currently, multiple calls to Controls.new are accepted (only the first
506    has any effect).  Eventually we should make sure that every control
507    is being made (via Controls.new) exactly once.  Future access can then
508    be done using Controls.acc.
509    
510    Finally, it would probably be a good idea to use the getter-setter
511    interface to controls rather than ref cells.  For the time being, both
512    styles are provided by the Controls module, but getter-setter pairs are
513    better if thread-safety is of any concern because they can be wrapped.
514    
515    *****************************************
516    
517    One bug fix: The function blockPlacement in three of the MLRISC
518    backpatch files used to be hard-wired to one of two possibilities at
519    link time (according to the value of the placementFlag).  But (I
520    think) it should rather sense the flag every time.
521    
522    *****************************************
523    
524    Other assorted changes (by other people who did not supply a HISTORY entry):
525    
526    1. the cross-module inliner now works much better (Monnier)
527    2. representation of weights, frequencies, and probabilities in MLRISC
528       changed in preparation of using those for weighted block placement
529       (Reppy, George)
530    
531    ----------------------------------------------------------------------
532    Name: Lal George
533    Date: 2002/03/07 14:44:24 EST 2002
534    Tag: george-20020307-weighted-block-placement
535    
536    Tested the weighted block placement optimization on all architectures
537    (except the hppa) using AMPL to generate the block and edge frequencies.
538    Changes were required in the machine properties to correctly
539    categorize trap instructions. There is an MLRISC flag
540    "weighted-block-placement" that can be used to enable weighted block
541    placement, but this will be ineffective without block/edge
542    frequencies (coming soon).
543    
544    
545    ----------------------------------------------------------------------
546    Name: Lal George
547    Date: 2002/03/05 17:24:48 EST
548    Tag: george-20020305-linkage-cluster
549    
550    In order to support the block placement optimization, a new cluster
551    is generated as the very first cluster (called the linkage cluster).
552    It contains a single jump to the 'real' entry point for the compilation
553    unit. Block placement has no effect on the linkage cluster itself, but
554    all the other clusters  have full freedom in the manner in which they
555    reorder blocks or functions.
556    
557    On the x86 the typical linkage code that is generated is:
558       ----------------------
559            .align 2
560       L0:
561            addl    $L1-L0, 72(%esp)
562            jmp     L1
563    
564    
565            .align  2
566       L1:
567       ----------------------
568    
569    72(%esp) is the memory location for the stdlink register. This
570    must contain the address of the CPS function being called. In the
571    above example, it contains the address of  L0; before
572    calling L1 (the real entry point for the compilation unit), it
573    must contain the address for L1, and hence
574    
575            addl $L1-L0, 72(%esp)
576    
577    I have tested this on all architectures except the hppa.The increase
578    in code size is of course negligible
579    
580    ----------------------------------------------------------------------
581    Name: Allen Leung
582  Date: 2002/03/03 13:20:00 EST  Date: 2002/03/03 13:20:00 EST
583  Tag: leunga-20020303-mlrisc-tools  Tag: leunga-20020303-mlrisc-tools
584    

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