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	revision 1137, Tue Mar 12 22:28:55 2002 UTC	revision 1212, Tue May 21 16:34:29 2002 UTC
#	Line 11	Line 11
11	Date: yyyy/mm/dd	Date: yyyy/mm/dd
12	Tag: <post-commit CVS tag>	Tag: <post-commit CVS tag>
13	Description:	Description:
14
15		----------------------------------------------------------------------
16		Name: Matthias Blume
17		Date: 2002/05/21 12:35:00 EDT
18		Tag: blume-20020521-cmdoc
19		Description:
20
21		CM documentation update.
22
23		----------------------------------------------------------------------
24		Name: Matthias Blume
25		Date: 2002/05/21 10:55:00 EDT
26		Tag: blume-20020521-misc
27		Description:
28
29		- John tweaked runtime to be silent on heap export (except when
30		GC messages are on).
31		- I added a few more things (cross-compiling versions of CMB) to
32		config/preloads (as suggestions).
33
34		----------------------------------------------------------------------
35		Name: Matthias Blume
36		Date: 2002/05/20 22:25:00 EDT
37		Tag: blume-20020520-controls
38		Description:
39
40		- Added ControlUtil structure to control-lib.cm.
41		- Use it throughout.
42		- Used Controls facility to define MLRISC controls (as opposed to
43		registering MLRISC control ref cells with Controls after the fact)
44		- Fixed messed-up controls priorities.
45
46		* Removed again all the stuff from config/preloads that one wouldn't
47		be able to preload at the time the initial heap image is built.
48		(Many libraries, e.g., CML, do not exist yet at this time.  The
49		only libraries that can be preloaded via config/preloads are those
50		that come bundled with the bootfiles.)
51
52		----------------------------------------------------------------------
53		Name: Matthias Blume
54		Date: 2002/05/20 10:59:00 EDT
55		Tag: blume-20020520-preloads
56		Description:
57
58		Added a lot of commented-out suggestions for things to be included
59		in config/preloads.
60
61		----------------------------------------------------------------------
62		Name: Allen Leung
63		Date: 2002/05/18 14:20:00 EDT
64		Tag: leunga-20020518-mdl
65		Description:
66
67		o Made the mdl tool stuff compile and run again.
68		o I've disabled all the stuff that depends on RTL specifications; they
69		are all badly broken anyway.
70
71		----------------------------------------------------------------------
72		Name: Matthias Blume
73		Date: 2002/05/17 16:49:00 EDT
74		Tag: blume-20020517-controls
75		Description:
76
77		0. John Reppy made several modifications to the SML/NJ library.
78		In particular, there is a shiny new controls-lib.cm.
79
80		1. Pushed new controls interface through compiler so that everything
81		compiles again.
82
83		2. Added FormatComb and FORMAT_COMB to the CML version of the
84		SML/NJ library (so that CML compiles again).
85
86		3. Modified init scripts because XXX_DEFAULT environment variables
87		are no longer with us.  (Boot-time initialization is now done
88		using the same environment variables that are also used for
89		startup-time initialization of controls.)
90
91		----------------------------------------------------------------------
92		Name: Lal George
93		Date: 2002/05/15 09:20:10 EDT
94		Tag: george-20020515-pseudo-op-decls
95		Description:
96
97		All pseudo-ops emitted before the first segment declaration
98		such as TEXT, DATA, and BSS directives are assumed to be global
99		declarations and are emitted first in the assembly file. This is
100		useful in a number of situations where one has pseudo-ops that are not
101		specific to any segment, and also works around the constraint that one
102		cannot have client pseudo-ops in the TEXT segment.
103
104		Because no segment is associated with these declarations it is
105		an error to allocate any space or objects before the first segment
106		directive and an exception will be raised. However, we cannot make
107		this check for client pseudo-ops.
108
109		These top level declarations are a field in the CFG graph_info.
110		In theory you can continue to add to this field after the CFG has been
111		built -- provided you know what you are doing;-)
112
113		----------------------------------------------------------------------
114		Name: Matthias Blume
115		Date: 2002/05/13 16:40:00 EDT
116		Tag: blume-20020513-pp-etc
117		Description:
118
119		A few minor bugfixes:
120
121		- Stopgap measure for bug recently reported by Elsa Gunter (ppDec).
122		(Bogus printouts for redefined bindings still occur.  Compiler
123		bug should no longer occur now.  We need to redo the prettyprinter
124		from scratch.)
125
126		- CM pathname printer now also adds escape sequences for ( and )
127
128		- commend and docu fixes for ml-nlffi
129
130		----------------------------------------------------------------------
131		Name: Matthias Blume
132		Date: 2002/05/10 16:40:00 EDT
133		Tag: blume-20020510-erg-textio
134		Description:
135
136		Applied the following bugfix provided by Emden Gansner:
137
138		Output is corrupted when outputSubstr is used rather than output.
139
140		The problem occurs when a substring
141
142		ss = (s, dataStart, dataLen)
143
144		where dataStart > 0, fills a stream buffer with avail bytes left.
145		avail bytes of s, starting at index dataStart, are copied into the
146		buffer, the buffer is flushed, and then the remaining dataLen-avail
147		bytes of ss are copied into the beginning of the buffer. Instead of
148		starting this copy at index dataStart+avail in s, the current code
149		starts the copy at index avail.
150
151		Fix:
152		In text-io-fn.sml, change line 695 from
153		val needsFlush = copyVec(v, avail, dataLen-avail, buf, 0)
154		to
155		val needsFlush = copyVec(v, dataStart+avail, dataLen-avail, buf, 0)
156
157		----------------------------------------------------------------------
158		Name: Matthias Blume
159		Date: 2002/04/12 13:55:00 EDT
160		Tag: blume-20020412-assyntax
161		Description:
162
163		1. Grabbed newer assyntax.h from the XFree86 project.
164		2. Fiddled with how to compile X86.prim.asm without warnings.
165		3. (Very) Minor cleanup in CM.
166
167		----------------------------------------------------------------------
168		Name: Matthias Blume
169		Date: 2002/04/01 (no joke!) 17:07:00 EST
170		Tag: blume-20020401-x86div
171		Description:
172
173		Added full support for div/mod/rem/quot on the x86, using the machine
174		instruction's two results (without clumsily recomputing the remainder)
175		directly where appropriate.
176
177		Some more extensive power-of-two support was added to the x86 instruction
178		selector (avoiding expensive divs, mods, and muls where they can be
179		replaced with cheaper shifts and masks).  However, this sort of thing
180		ought to be done earlier, e.g., within the CPS optimizer so that
181		all architectures benefit from it.
182
183		The compiler compiles to a fixed point, but changes might be somewhat
184		fragile nevertheless.  Please, report any strange things that you might
185		see wrt. div/mod/quot/rem...
186
187		----------------------------------------------------------------------
188		Name: Matthias Blume
189		Date: 2002/03/29 17:22:00
190		Tag: blume-20020329-div
191		Description:
192
193		Fixed my broken div/mod logic.  Unfortunately, this means that the
194		inline code for div/mod now has one more comparison than before.
195		Fast paths (quotient > 0 or remainder = 0) are not affected, though.
196		The problem was with quotient = 0, because that alone does not tell
197		us which way the rounding went.  One then has to look at whether
198		remainder and divisor have the same sign...  :(
199
200		Anyway, I replaced the bootfiles with fresh ones...
201
202		----------------------------------------------------------------------
203		Name: Matthias Blume
204		Date: 2002/03/29 14:10:00 EST
205		Tag: blume-20020329-inlprims
206		Description:
207
208		NEW BOOTFILES!!!    Version number bumped to 110.39.3.
209
210		Primops have changed. This means that the bin/boot-file formats have
211		changed as well.
212
213		To make sure that there is no confusion, I made a new version.
214
215
216		CHANGES:
217
218		* removed REMT from mltree (remainder should never overflow).
219
220		* added primops to deal with divisions of all flavors to the frontend
221
222		* handled these primops all the way through so they map to their respective
223		MLRISC support
224
225		* used these primops in the implementation of Int, Int32, Word, Word32
226
227		* removed INLDIV, INLMOD, and INLREM as they are no longer necessary
228
229		* parameterized INLMIN, INLMAX, and INLABS by a numkind
230
231		* translate.sml now deals with all flavors of INL{MIN,MAX,ABS}, including
232		floating point
233
234		* used INL{MIN,MAX,ABS} in the implementation of Int, Int32, Word, Word32,
235		and Real (but Real.abs maps to a separate floating-point-only primop)
236
237
238		TODO items:
239
240		* Hacked Alpha32 instruction selection, disabling the selection of REMx
241		instructions because the machine instruction encoder cannot handle
242		them.  (Hppa, PPC, and Sparc instruction selection did not handle
243		REM in the first place, and REM is supported by the x86 machine coder.)
244
245		* Handle DIV and MOD with DIV_TO_NEGINF directly in the x86 instruction
246		selection phase.  (The two can be streamlined because the hardware
247		delivers both quotient and remainder at the same time anyway.)
248
249		* Think about what to do with "valOf(Int32.minInt) div ~1" and friends.
250		(Currently the behavior is inconsistent both across architectures and
251		wrt. the draft Basis spec.)
252
253		* Word8 should eventually be handled natively, too.
254
255		* There seems to be one serious bug in mltree-gen.sml.  It appears, though,
256		as if there currently is no execution path that could trigger it in
257		SML/NJ.  (The assumptions underlying functions arith and promotable do not
258		hold for things like multiplication and division.)
259
260		----------------------------------------------------------------------
261		Name: Matthias Blume
262		Date: 2002/03/27 16:27:00 EST
263		Tag: blume-20020327-mlrisc-divisions
264		Description:
265
266		Added support for all four division operations (ML's div, mod, quot,
267		and rem) to MLRISC.  In the course of doing so, I also rationalized
268		the naming (no more annoying switch-around of DIV and QUOT), by
269		parameterizing the operation by div_rounding_mode (which can be either
270		DIV_TO_ZERO or DIV_TO_NEGINF).
271
272		The generic MLTreeGen functor takes care of compiling all four
273		operations down to only round-to-zero div.
274
275		Missing pieces:
276
277		* Doing something smarter than relying on MLTreeGen on architectures
278		like, e.g., the x86 where hardware division delivers both quotient and
279		remainder at the same time.  With this, the implementation of the
280		round-to-neginf operations could be further streamlined.
281
282		* Remove inlining support for div/mod/rem from the frontend and replace it
283		with primops that get carried through to the backend.  Do this for all
284		int and word types.
285
286		----------------------------------------------------------------------
287		Name: Matthias Blume
288		Date: 2002/03/25 17:25:00 EST
289		Tag: blume-20020325-divmod
290		Description:
291
292		I improved (hopefully without breaking them) the implementation of Int.div,
293		Int.mod, and Int.rem.   For this, the code in translate.sml now takes
294		advantage of the following observations:
295
296		Let  q = x quot y      r = x rem y
297		d = x div  y      m = x mod y
298
299		where "quot" is the round-to-zero version of integer division that
300		hardware usually provides.  Then we have:
301
302		r = x - q * y        where neither the * nor the - will overflow
303		d = if q >= 0 orelse x = q * y then q else q - 1
304		where neither the * nor the - will overflow
305		m = if q >= 0 orelse r = 0 then r else r + y
306		where the + will not overflow
307
308		This results in substantial simplification of the generated code.
309		The following table shows the number of CFG nodes and edges generated
310		for
311		fun f (x, y) = x OPER y
312		(* with OPER \in div, mod, quot, rem *)
313
314
315		OPER | nodes(old) | edges(old) | nodes(new) | edges(new)
316		--------------------------------------------------------
317		div |         24 |         39 |         12 |         16
318		mod |         41 |         71 |         12 |         16
319		quot |          8 |         10 |          8 |         10
320		rem |         10 |         14 |          8 |         10
321
322
323		----------------------------------------------------------------------
324		Name: Matthias Blume
325		Date: 2002/03/25 22:06:00 EST
326		Tag: blume-20020325-cprotobug
327		Description:
328
329		Fixed a bug in cproto (c prototype decoder).
330
331		----------------------------------------------------------------------
332		Name: Matthias Blume
333		Date: 2002/03/25 16:00:00 EST
334		Tag: blume-20020325-raw-primops
335		Description:
336
337		I did some cleanup to Allen's new primop code and
338		replaced yesterday's bootfiles with new ones.
339		(But they are stored in the same place.)
340
341		----------------------------------------------------------------------
342		Name: Matthias Blume
343		Date: 2002/03/24 22:40:00 EST
344		Tag: blume-20020324-bootfiles
345		Description:
346
347		Made the bootfiles that Allen asked for.
348
349		----------------------------------------------------------------------
350		Name: Allen Leung
351		Date: 2002/03/23 15:50:00 EST
352		Tag: leunga-20020323-flint-cps-rcc-primops
353		Description:
354
355		1. Changes to FLINT primops:
356
357		(* make a call to a C-function;
358		* The primop carries C function prototype information and specifies
359		* which of its (ML-) arguments are floating point. C prototype
360		* information is for use by the backend, ML information is for
361		* use by the CPS converter. *)
362		| RAW_CCALL of { c_proto: CTypes.c_proto,
363		ml_args: ccall_type list,
364		ml_res_opt: ccall_type option,
365		reentrant : bool
366		} option
367		(* Allocate uninitialized storage on the heap.
368		* The record is meant to hold short-lived C objects, i.e., they
369		* are not ML pointers.  With the tag, the representation is
370		* the same as RECORD with tag tag_raw32 (sz=4), or tag_fblock (sz=8)
371		*)
372		| RAW_RECORD of {tag:bool,sz:int}
373		and ccall_type = CCALL_INT32 | CCALL_REAL64 | CCALL_ML_PTR
374
375		2.  These CPS primops are now overloaded:
376
377		rawload of {kind:numkind}
378		rawstore of {kind:numkind}
379
380		The one argument form is:
381
382		rawload {kind} address
383
384		The two argument form is:
385
386		rawload {kind} [ml object, byte-offset]
387
388		3. RAW_CCALL/RCC now takes two extra arguments:
389
390		a. The first is whether the C call is reentrant, i.e., whether
391		ML state should be saved and restored.
392		b. The second argument is a string argument specifying the name of
393		library and the C function.
394
395		These things are currently not handled in the code generator, yet.
396
397		4. In CProto,
398
399		An encoding type of "bool" means "ml object" and is mapped into
400		C prototype of PTR.  Note that "bool" is different than "string",
401		even though "string" is also mapped into PTR, because "bool"
402		is assigned an CPS type of BOGt, while "string" is assigned INT32t.
403
404		5. Pickler/unpicker
405
406		Changed to handle RAW_RECORD and newest RAW_CCALL
407
408		6. MLRiscGen,
409
410		1. Changed to handle the new rawload/rawstore/rawrecord operators.
411		2. Code for handling C Calls has been moved to a new module CPSCCalls,
412		in the file CodeGen/cpscompile/cps-c-calls.sml
413
414		7. Added the conditional move operator
415
416		condmove of branch
417
418		to cps.  Generation of this is still buggy so it is currently
419		disabled.
420
421		----------------------------------------------------------------------
422		Name: Lal George
423		Date: 2002/03/22 14:18:25 EST
424		Tag: george-20020322-cps-branch-prob
425		Description:
426
427		Implemented the Ball-Larus branch prediction-heuristics, and
428		incorporated graphical viewers for control flow graphs.
429
430		Ball-Larus Heuristics:
431		---------------------
432		See the file compiler/CodeGen/cpscompile/cpsBranchProb.sml.
433
434		By design it uses the Dempster-Shafer theory for combining
435		probabilities.  For example, in the function:
436
437		fun f(n,acc) = if n = 0 then acc else f(n-1, n*acc)
438
439		the ball-larus heuristics predicts that the n=0 is unlikely
440		(OH-heuristic), and the 'then' branch is unlikely because of the
441		RH-heuristic -- giving the 'then' branch an even lower combined
442		probability using the Dempster-Shafer theory.
443
444		Finally, John Reppy's loop analysis in MLRISC, further lowers the
445		probability of the 'then' branch because of the loop in the else
446		branch.
447
448
449		Graphical Viewing:
450		------------------
451		I merely plugged in Allen's graphical viewers into the compiler. The
452		additional code is not much. At the top level, saying:
453
454		Control.MLRISC.getFlag "cfg-graphical-view" := true;
455
456		will display the graphical view of the control flow graph just before
457		back-patching.  daVinci must be in your path for this to work. If
458		daVinci is not available, then the default viewer can be changed
459		using:
460
461		Control.MLRISC.getString "viewer"
462
463		which can be set to "dot" or "vcg" for the corresponding viewers. Of
464		course, these viewers must be in your path.
465
466		The above will display the compilation unit at the level of clusters,
467		many of which are small, boring, and un-interesting. Also setting:
468
469		Control.MLRISC.getInt "cfg-graphical-view_size"
470
471		will display clusters that are larger than the value set by the above.
472
473
474		----------------------------------------------------------------------
475		Name: Matthias Blume
476		Date: 2002/03/21 22:20:00 EST
477		Tag: blume-20020321-kmp-bugfix
478		Description:
479
480		Changed the interface to the KMP routine in PreString and fixed
481		a minor bug in one place where it was used.
482
483		----------------------------------------------------------------------
484		Name: Allen Leung
485		Date: 2002/03/21 20:30:00 EST
486		Tag: leunga-20020321-cfg
487		Description:
488
489		Fixed a potential problem in cfg edge splitting.
490
491		----------------------------------------------------------------------
492		Name: Allen Leung
493		Date: 2002/03/21 17:15:00 EST
494		Tag: leunga-20020321-x86-fp-cfg
495		Description:
496
497		1. Recoded the buggy parts of x86-fp.
498
499		a. All the block reordering code has been removed.
500		We now depend on the block placement phases to do this work.
501
502		b. Critical edge splitting code has been simplified and moved into the
503		CFG modules, as where they belong.
504
505		Both of these were quite buggy and complex.  The code is now much, much
506		simpler.
507
508		2. X86 backend.
509
510		a. Added instructions for 64-bit support.  Instruction selection for
511		64-bit has not been committed, however, since that
512		requires changes to MLTREE which haven't been approved by
513		Lal and John.
514
515		b. Added support for FUCOMI and FUCOMIP when generating code for
516		PentiumPro and above.  We only generate these instructions in
517		the fast-fp mode.
518
519		c. Added cases for JP and JNP in X86FreqProps.
520
521		3. CFG
522
523		CFG now has a bunch of methods for edge splitting and merging.
524
525		4. Machine description.
526
527		John's simplification of MLTREE_BASIS.fcond broke a few machine
528		description things:
529
530		rtl-build.{sig,sml} and hppa.mdl fixed.
531
532		NOTE: the machine description stuff in the repository is still broken.
533		Again, I can't put my fixes in because that involves
534		changes to MLTREE.
535
536		----------------------------------------------------------------------
537		Name: Matthias Blume
538		Date: 2002/03/20 15:55:00 EST
539		Tag: blume-20020320-kmp
540		Description:
541
542		Implemented Knuth-Morris-Pratt string matching in PreString and used
543		it for String.isSubstring, Substring.isSubstring, and
544		Substring.position.
545
546		(Might need some stress-testing.  Simple examples worked fine.)
547
548		----------------------------------------------------------------------
549		Name: Matthias Blume
550		Date: 2002/03/19 16:37:00 EST
551		Tag: blume-20020319-witnesses
552		Description:
553
554		Added a structure C.W and functions convert/Ptr.convert to ml-nlffi-lib.
555
556		This implements a generic mechanism for changing constness qualifiers
557		anywhere within big C types without resorting to outright "casts".
558		(So far, functions such as C.rw/C.ro or C.Ptr.rw/C.Ptr.ro only let you
559		modify the constness at the outermost level.)
560		The implementation of "convert" is based on the idea of "witness"
561		values -- values that are not used by the operation but whose types
562		"testify" to their applicability.  On the implementation side, "convert"
563		is simply a projection (returning its second curried argument).  With
564		cross-module inlining, it should not result in any machine code being
565		generated.
566
567		----------------------------------------------------------------------
568		Name: Matthias Blume
569		Date: 2002/03/15 16:40:00 EST
570		Tag: blume-20020315-basis
571		Description:
572
573		Provided (preliminary?) implementations for
574
575		{String,Substring}.{concatWith,isSuffix,isSubstring}
576
577		and
578
579		Substring.full
580
581		Those are in the Basis spec but they were missing in SML/NJ.
582
583		----------------------------------------------------------------------
584		Name: Matthias Blume
585		Date: 2002/03/14 21:30:00 EST
586		Tag: blume-20020314-controls
587		Description:
588
589		Controls:
590		---------
591
592		1. Factored out the recently-added Controls : CONTROLS stuff and put
593		it into its own library $/controls-lib.cm.  The source tree for
594		this is under src/smlnj-lib/Controls.
595
596		2. Changed the names of types and functions in this interface, so they
597		make a bit more "sense":
598
599		module -> registry
600		'a registry -> 'a group
601
602		3. The interface now deals in ref cells only.  The getter/setter interface
603		is (mostly) gone.
604
605		4. Added a function that lets one register an already-existing ref cell.
606
607		5. Made the corresponding modifications to the rest of the code so that
608		everything compiles again.
609
610		6. Changed the implementation of Controls.MLRISC back to something closer
611		to the original.  In particular, this module (and therefore MLRISC)
612		does not depend on Controls.  There now is some link-time code in
613		int-sys.sml that registers the MLRISC controls with the Controls
614		module.
615
616		CM:
617		---
618
619		* One can now specify the lambda-split aggressiveness in init.cmi.
620
621		----------------------------------------------------------------------
622		Name: Allen Leung
623		Date: 2002/03/13 17:30:00 EST
624		Tag: leunga-20020313-x86-fp-unary
625		Description:
626
627		Bug fix for:
628
629		> leunga@weaselbane:~/Yale/tmp/sml-dist{21} bin/sml
630		> Standard ML of New Jersey v110.39.1 [FLINT v1.5], March 08, 2002
631		> - fun f(x,(y,z)) = Real.~ y;
632		> [autoloading]
633		> [autoloading done]
634		>       fchsl   (%eax), 184(%esp)
635		> Error: MLRisc bug: X86MCEmitter.emitInstr
636		>
637		> uncaught exception Error
638		>   raised at: ../MLRISC/control/mlriscErrormsg.sml:16.14-16.19
639
640		The problem was that the code generator did not generate any fp registers
641		in this case, and the ra didn't know that it needed to run the X86FP phase to
642		translate the pseudo fp instruction.   This only happened with unary fp
643		operators in certain situations.
644
645		----------------------------------------------------------------------
646		Name: Matthias Blume
647		Date: 2002/03/13 14:00:00 EST
648		Tag: blume-20020313-overload-etc
649		Description:
650
651		1. Added _overload as a synonym for overload for backward compatibility.
652		(Control.overloadKW must be true for either version to be accepted.)
653
654		2. Fixed bug in install script that caused more things to be installed
655		than what was requested in config/targets.
656
657		3. Made CM aware of the (_)overload construct so that autoloading
658		works.
659
660		----------------------------------------------------------------------
661		Name: Matthias Blume
662		Date: 2002/03/12 22:03:00 EST
663		Tag: blume-20020312-url
664		Description:
665
666		Forgot to update BOOT and srcarchiveurl.
667
668	----------------------------------------------------------------------	----------------------------------------------------------------------
669	Name: Matthias Blume	Name: Matthias Blume
670	Date: 2002/03/12 17:30:00 EST	Date: 2002/03/12 17:30:00 EST
#	Line 27	Line 681
681	provides a bit more "stability":  Once CM has seen a compilation	provides a bit more "stability":  Once CM has seen a compilation
682	unit, it keeps its identity constant (as long as you do not delete	unit, it keeps its identity constant (as long as you do not delete
683	those crucial CM/GUID/* files).  This means that when you change	those crucial CM/GUID/* files).  This means that when you change
684	and interface, compiler, then go back to the old interface, and	an interface, compile, then go back to the old interface, and
685	compile again, you arrive at the original pid.	compile again, you arrive at the original pid.
686
687	There now also is a mechanism that instructs CM to use the plain	There now also is a mechanism that instructs CM to use the plain
#	Line 102	Line 756
756	----------------------------------------------------------------------	----------------------------------------------------------------------
757	Name: Allen Leung	Name: Allen Leung
758	Date: 2002/03/11 10:30:00 EST	Date: 2002/03/11 10:30:00 EST
759	Tag: leunga-20020310-runtime-string0	Tag: leunga-20020311-runtime-string0
760	Description:	Description:
761
762	The representation of the empty string now points to a	The representation of the empty string now points to a

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Legend: Removed from v.1137   changed lines   Added in v.1212

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