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Annotation of /sml/trunk/HISTORY

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1 : dbm 570 This is the HISTORY file for the Yale SML/NJ CVS repository.
2 :    
3 :     An entry should be made for _every_ commit to the repository.
4 :     The entries in this file will be used when creating the README
5 :     for new versions, so keep that in mind when writing the
6 :     description.
7 :    
8 :     The form of an entry should be:
9 :    
10 :     Name:
11 :     Date:
12 :     Tag: <post-commit CVS tag>
13 :     Description:
14 : leunga 591 ----------------------------------------------------------------------
15 : leunga 646 Name: Allen Leung
16 : leunga 648 Date: 2000/05/25 17:28 EDT
17 :     Tag: leunga-20000525-ra
18 :     Description:
19 :    
20 :     Fixed a bug in freezing phase of the register allocator.
21 :    
22 :     ----------------------------------------------------------------------
23 :     Name: Allen Leung
24 : leunga 647 Date: 2000/05/15 22:53 EDT
25 : leunga 646 Tag: leunga-20000515-alpha-x86-ra
26 :     Description:
27 :    
28 :     1. Alpha
29 :    
30 :     Slight cleanup. Removed the instruction SGNXL
31 :    
32 :     2. X86
33 :    
34 :     Added the following instructions to the instruction set:
35 :    
36 :     ROLx, RORx,
37 :     BTx, BTSx, BTLx, BTRx,
38 :     XCHGx, and variants with the LOCK prefix
39 :    
40 :     3. Register Allocation
41 :    
42 :     The module ra-rewrite-with-renaming has been improved.
43 :    
44 : leunga 647 These have no effect on SML/NJ.
45 :    
46 : leunga 646 ----------------------------------------------------------------------
47 : blume 642 Name: Matthias Blume
48 : blume 645 Date: 2000/05/15 16:20:00 JST
49 :     Tag: blume-20000515-lightrebuild
50 :     Description:
51 :    
52 :     1. I added an alternative to "-rebuild" to "makeml". The difference is
53 :     that prior to calling CMB.make' the CM-variable "LIGHT" will be
54 :     defined. In effect, the command will not build any cross-compiler
55 :     backends and therefore finish more quickly.
56 :    
57 :     The "fixpt" script also takes a "-light" switch to be able to use
58 :     this new facility while compiling for a fixpoint.
59 :    
60 :     2. I replaced all mentions of anchored paths in group owner specifications
61 :     with simple relative paths (usually starting with "..").
62 :     The rationale is that a library's internal workings should not be
63 :     compromised by the lack of some anchor. (An anchor is necessary
64 :     for someone who wants to refer to the library by an anchored path,
65 :     but it should not be necessary to build the same library in the first
66 :     place.)
67 :    
68 :     3. I changed the way CM's tool mechanism determines the shell command
69 :     string used for things like ml-yacc etc. so that it does not break
70 :     when CM.Control.implicit_anchors is turned off.
71 :    
72 :     ----------------------------------------------------------------------
73 :     Name: Matthias Blume
74 : blume 644 Date: 2000/05/12 18:20:00 JST
75 :     Tag: blume-20000512-ml-build
76 :     Description:
77 :    
78 :     Fixed a bug in config/_ml-build that prevented ml-yacc and ml-lex from
79 :     getting installed properly (by config/install.sh).
80 :    
81 :     ----------------------------------------------------------------------
82 :     Name: Matthias Blume
83 : blume 643 Date: 2000/05/12 17:30:00 JST
84 :     Tag: blume-20000512-anchors
85 :     Description:
86 :    
87 :     !!! NEW BOOT FILES !!!
88 :    
89 :     This change is in preparation of fading out support for "implicitly
90 :     anchored path names". I went through all sources and used the
91 :     explicit (and relatively new) $-notation. See system/README and the
92 :     CM manual for more info on this.
93 :    
94 :     I also modified the anchoring scheme for some things such as "smlnj",
95 :     "MLRISC", "cm", etc. to take advantage of the fact that explicit
96 :     anchors are more expressive: anchor name and first arc do not have to
97 :     coincide. This entails the following user-visible change:
98 :    
99 :     You have to write $smlnj/foo/bar instead of smlnj/foo/bar. In
100 :     particular, when you fire up sml with a command-line argument, say,
101 :     e.g.:
102 :    
103 :     sml '$smlnj/cmb.cm'
104 :    
105 :     At the ML toplevel prompt:
106 :    
107 :     CM.autoload "$smlnj/cmb.cm";
108 :    
109 :     There is also a new controller in CM.Control that can be used to turn
110 :     off all remaining support for implicit anchors by saying:
111 :    
112 :     CM.autoload "$smlnj/
113 :     #set CM.Control.implicit_anchors false;
114 :    
115 :     This causes CM to reject implicitly anchored paths. This is (for the
116 :     time being) less permissive than the "final" version where there will
117 :     be no more such implicit anchors and relative paths will be just that:
118 :     relative.
119 :    
120 :     The next step (version after next version?) will be to make the
121 :     default for CM.Control.implicit_anchors false. After the dust has
122 :     settled, I can then produce the "final" version of this...
123 :    
124 :     Note: Since bootstrapping is a bit tricky, I provided new boot files.
125 :    
126 :     ----------------------------------------------------------------------
127 :     Name: Matthias Blume
128 : blume 642 Date: 2000/05/11 16:30:00 JST
129 :     Tag: blume-20000511-sources
130 :     Description:
131 :    
132 :     The main change is that I added function CM.sources as a generalized
133 :     version of the earlier CM.makedepend. This entails the following
134 :     additional changes:
135 :    
136 :     - CM.makedepend has been dropped.
137 :    
138 :     - CM manual has been updated.
139 :    
140 :     - TOOLS signature and API have been changed.
141 :    
142 :     ----------------------------------------------------------------------
143 : leunga 640 Name: Allen Leung
144 : leunga 641 Date: 2000/05/10 21:17 EDT
145 :     Tag: leunga-20000510-moby-c--ssa
146 :     Description:
147 :    
148 :     Various bug fixes and new features for C--, Moby and MLRISC optimizations.
149 :     None of these affect SML/NJ.
150 :    
151 :     1. Register Allocation
152 :    
153 :     a. A new ra spilling module (ra/ra-spill-with-renaming) is implemented.
154 :     This module tries to remove local (i.e. basic block level) redundancies
155 :     during spilling.
156 :    
157 :     b. A new framework for performing region based register allocation.
158 :     Not yet entirely functional.
159 :    
160 :     2. X86
161 :    
162 :     a. DefUse for POP was missing the stack pointer [found by Lal]
163 :     b. Reload for CALL was incorrect in X86Spill [found by John]
164 :     c. Various fixes in X86Spill so that it can be used correctly for
165 :     the new spilling module.
166 :    
167 :     3. SSA/IR
168 :    
169 :     a. New module ir/dj-dataflow.sml implements elimination based
170 :     data flow analysis.
171 :    
172 :     4. MLRiscGen
173 :    
174 :     a. Fix for gc type annotation
175 :    
176 :     5. MDGen
177 :    
178 :     Various fixes for machine description -> ml code translation. For ssa
179 :     only.
180 :    
181 :     ----------------------------------------------------------------------
182 :     Name: Allen Leung
183 : leunga 640 Date: 2000/05/08 22:17 EDT
184 :     Tag: leunga-20000508-labexp
185 :     Description:
186 :    
187 :     Fermin has found a few assembly problems with constant expressions
188 :     generated in LabelExp. Mostly, the problems involve extra parentheses,
189 :     which choke on dumb assemblers. This is his fix.
190 :    
191 :     ----------------------------------------------------------------------
192 : dbm 635 Name: Dave MacQueen
193 :     Date: 2000/04/09 14:00 EDT
194 :     Tag: dbm-20000502-Version_110_28
195 :     Description:
196 :    
197 :     1. Updated src/compiler/TopLevel/main/version.sml to version 110.28
198 :    
199 :     2. Updated config/version to 110.28
200 :    
201 :     3. Updated config/srcarchiveurl
202 :    
203 :     3. New boot files!
204 :     ftp://ftp.research.bell-labs.com/dist/smlnj/working/110.28/
205 :    
206 :     ----------------------------------------------------------------------
207 : blume 634 Name: Matthias Blume
208 :     Date: 2000/05/01 19:05:00 JST
209 :     Tag: blume-20000501-noweb
210 :     Description:
211 :    
212 :     A new noweb tool has been added. The existing system is entirely
213 :     unaffected by this, but some CM users have asked for renewed noweb
214 :     support. Everything is documented in the CM manual.
215 :    
216 :     New (plugin) libraries:
217 :    
218 :     noweb-tool.cm
219 :     nw-ext.cm
220 :    
221 :     ----------------------------------------------------------------------
222 : dbm 633 Name: Dave MacQueen
223 :     Date: 2000/04/30 12:40PM EDT
224 :     Tag: dbm-20000430-bug_fixes
225 :     Description:
226 :    
227 :     1. Fix for bug 1498
228 :     smlnj/src/system/Basis/Implementation/Unsafe/object.sig
229 :     smlnj/src/system/Basis/Implementation/Unsafe/object.sml
230 :     added toRealArray function
231 :     smlnj/src/compiler/MiscUtil/print/ppobj.sml
232 :     added check for tag Obj.RealArray to array printing case in ppObj
233 :    
234 :     2. Fix for bug 1510
235 :     smlnj/src/compiler/Semant/types/typesutil.sml
236 :     fixed definition of dummyargs (used by equalTycon) so that
237 :     dummy args are distinct types
238 :    
239 :     ----------------------------------------------------------------------
240 : blume 629 Name: Matthias Blume
241 : blume 632 Date: 2000/04/30 01:00:00 JST
242 :     Tag: blume-20000430-versions
243 :     Description:
244 :    
245 :     1. CM version numbering added. This is an implementation of Lal's
246 :     proposal for adding version numbers and version checking to .cm
247 :     files. Lal said that his proposal was just that -- a proposal.
248 :     For the time being I went ahead and implemented it so that people
249 :     can comment on it. Everything is completely backward-compatible
250 :     (except for the stable library format, i.e., new bootfiles!).
251 :    
252 :     As usual, see the CM manual for details.
253 :    
254 :     2. An alternative syntax for anchored paths has been implemented.
255 :     Dave has recently voiced the same concerns that I had when I did
256 :     this, so there should be some support. My take is that eventually
257 :     I will let support for the current syntax (where anchors are
258 :     "implicit") fade out in favor of the new, explicit syntax.
259 :     In order to be backward-compatible, both old and new syntax are
260 :     currently supported.
261 :    
262 :     Again, see the CM manual for details.
263 :    
264 :     3. Parallel make is trying to be slightly smarter: When the master
265 :     process finds a "bottleneck", i.e., when there is only one
266 :     compilation unit that can be compiled and everybody else is
267 :     waiting on it, then it will simply compile it directly instead
268 :     of clumsily telling one of the slaves to do it.
269 :    
270 :     4. Support for "unsharing" added. This is necessary in order to be
271 :     able to have two different versions of the same library running
272 :     at the same time (e.g., for trying out a new MLRISC while still
273 :     having the old MLRISC linked into the current compiler, etc.)
274 :     See the CM manual.
275 :    
276 :     5. Simple "makedepend" functionality added for generating Makefile
277 :     dependency information. (This is rather crude at the moment.
278 :     Expect some changes here in the future.)
279 :    
280 :     6. ".fun" added as a recognized suffix for ML files. Also documented
281 :     explicitly in the manual that the fallback behavior (unknown suffix
282 :     -> ML file) is not an official feature!
283 :    
284 :     7. Small changes to the pickler for stable libraries.
285 :    
286 :     8. Several internal changes to CM (for cleanup/improvement).
287 :    
288 :    
289 :     !!!! NEW BINFILES !!!!
290 :    
291 :     ----------------------------------------------------------------------
292 :     Name: Matthias Blume
293 : blume 631 Date: 2000/04/28 17:30:00 JST
294 :     Tag: blume-20000428-pathconfig
295 :     Description:
296 :    
297 :     1. I changed config/install.sh to remove duplicate entries from the
298 :     lib/pathconfig file at the end. Moreover, the final version of
299 :     lib/pathconfig is sorted alphabetically. The same (sorting) is done
300 :     in src/system/installml.
301 :    
302 :     2. The config/install.sh script now consistently uses relative
303 :     pathnames in lib/pathconfig whenever the anchor is in the lib
304 :     directory. (So far this was true for the libraries that come
305 :     pre-compiled and bundled as part of the bootfiles but not for
306 :     libraries that are compiled by the script itself.)
307 :    
308 :     ----------------------------------------------------------------------
309 :     Name: Matthias Blume
310 : blume 629 Date: 2000/04/26 13:10:00 JST
311 :     Tag: blume-20000426-fun_suffix
312 :     Description:
313 :    
314 :     Added ".fun" as a recognized file name suffix (for ML code).
315 :    
316 :     ----------------------------------------------------------------------
317 : leunga 628 Name: Allen Leung
318 :     Date: 2000/04/25 17:00:00 EST
319 :     Tag: leunga-20000425-alpha-ra
320 :     Description:
321 :    
322 :     1. Alpha
323 :    
324 :     PSEUDOARITH was missing in AlphaRewrite. This causes an endless loop
325 :     in C--.
326 :    
327 :     2. RA
328 :    
329 :     Added a flag "ra-dump-size" to print out the size of the flowgraph
330 :     and the interference graph.
331 :    
332 :     ----------------------------------------------------------------------
333 : dbm 627 Name: Dave MacQueen
334 :     Date: 2000/04/25/
335 :     Tag: dbm-20000425-mlyacc_doc_examples
336 :     Description:
337 :     Updated mlyacc.tex sections 5 and 7 for SML '97 and CM.
338 :     Updated all three examples in src/ml-yacc/examples to run
339 :     under 110.* using CM.make.
340 :    
341 :     ----------------------------------------------------------------------
342 : leunga 624 Name: Allen Leung
343 :     Date: 2000/04/20 23:04:00 EST
344 :     Tag: leunga-20000420-ssa-c---stuff
345 :     Description:
346 :    
347 :     This update synchronizes my repository with Yale's. Most of these
348 :     changes, however, do not affect SML/NJ at all (the RA is an exception).
349 :    
350 :     1. Register Allocator
351 :    
352 :     a. An improvement in the interference graph construction:
353 :     Given a copy
354 :    
355 :     s <- t
356 :    
357 : leunga 628 no interference edge between s and t is added for this definition of s.
358 : leunga 624
359 :     b. I've added two new spill heuristic modules that Fermin and I developed
360 :     (in the new library RA.cm). These are unused in SML/NJ but maybe
361 :     useful for others (Moby?)
362 :    
363 :     2. X86
364 :    
365 :     a. Various fixes in the backend provided by Fermin [C--] and Lal.
366 :    
367 :     3. Alpha
368 :    
369 :     a. Added the BSR instruction and code generation that goes with it [C--]
370 :     b. Other fixes too numerous to recount provided by Fermin [C--]
371 :    
372 :     4. Regmaps
373 :    
374 :     a. The regmaps are not initialized with the identity physical bindings
375 :     at creation time. This is unneeded.
376 :    
377 :     5. MLRISC Optimizations
378 :    
379 :     a. The DJ-Graph module can now compute the iterated dominance frontiers
380 :     intersects with liveness incrementally in linear time! Woohoo!
381 :     This is now used in my new SSA construction algorithm.
382 :    
383 :     b. THe branch reorganization module is now smarter about linear chains of
384 :     basic blocks.
385 :    
386 :    
387 :     ----------------------------------------------------------------------
388 : blume 615 Name: Matthias Blume
389 :     Date: 2000/04/12 13:52:00 JST
390 :     Tag: blume_main_v110p27_1
391 :     Description:
392 :    
393 :     Changed install.sh script to handle archive files without version number
394 :     and to use "boot.<arch>-<os>" instead of "sml.boot.<arch>-<os>" for the
395 :     name of the boot file archive.
396 :    
397 :     ----------------------------------------------------------------------
398 : dbm 607 Name: Dave MacQueen
399 :     Date: 2000/04/09 14:00 EDT
400 :     Tag: dbm-20000410-Version_110_27
401 :     Description:
402 :    
403 :     1. Updated src/compiler/TopLevel/main/version.sml to version 110.27
404 :    
405 :     2. Updated src/config/version to 110.27
406 :    
407 :     3. New boot files!
408 :    
409 :     ----------------------------------------------------------------------
410 : leunga 606 Name: Allen Leung
411 :     Date: 2000/04/09 19:09:00 EST
412 :     Tag: leunga-20000409-misc
413 :     Description:
414 :    
415 :     1. Yet another fix for x86 assembly for idivl, imull, mull and friends.
416 :    
417 :     2. Miscellaneous improvements to MLRISC (unused in sml/nj)
418 :    
419 :     ----------------------------------------------------------------------
420 : monnier 605 Name: Stefan
421 :     Date: 2000/04/07 10:00:00 EDT
422 :     Tag: monnier-20000406-branch-handling
423 :     Description:
424 :    
425 :     Improved handling of branches (mostly those generated from
426 :     polymorphic equality), removed switchoff and changed the
427 :     default optimization settings (more cpsopt and less flintopt).
428 :    
429 :     ----------------------------------------------------------------------
430 : leunga 601 Name: Allen Leung
431 : leunga 602 Date: 2000/04/06 01:30:00 EST
432 :     Tag: leunga-20000406-peephole-x86-SSA-2
433 :     Description:
434 :    
435 :     Forgot a few files.
436 :    
437 :     ----------------------------------------------------------------------
438 :     Name: Allen Leung
439 : leunga 601 Date: 2000/04/06 00:36:00 EST
440 :     Tag: leunga-20000406-peephole-x86-SSA
441 :     Description:
442 :    
443 :     1. New Peephole code
444 :    
445 :     2. Minor improvement to X86 instruction selection
446 :    
447 :     3. Various fixes to SSA and machine description -> code translator
448 :    
449 :     ----------------------------------------------------------------------
450 : blume 595 Name: Matthias Blume
451 :     Date: 2000/04/05 12:30:00 JST
452 :     Tag: blume_main_v110p26p2_3
453 :     Description:
454 :    
455 :     This update just merges three minor cosmetic updates to CM's sources
456 :     to get ready for the 110.27 code freeze on Friday. No functionality
457 :     has changed.
458 :    
459 :     ----------------------------------------------------------------------
460 : leunga 593 Name: Allen Leung
461 : leunga 594 Date: 2000/04/04 19:39:00 EST
462 :     Tag: leunga-20000404-x86-asm
463 :     Description:
464 :    
465 :     1. Fixed a problem in X86 assembly.
466 :    
467 :     Things like
468 :    
469 :     jmp %eax
470 :     jmp (%eax)
471 :    
472 :     should be output as
473 :    
474 :     jmp *%eax
475 :     jmp *(%eax)
476 :    
477 :     2. Assembly output
478 :    
479 :     Added a new flag
480 :    
481 :     "asm-indent-copies" (default to false)
482 :    
483 :     When this flag is on, parallel copies will be indented an extra level.
484 :    
485 :     ----------------------------------------------------------------------
486 :     Name: Allen Leung
487 : leunga 593 Date: 2000/04/04 03:18:00 EST
488 :     Tag: leunga-20000404-C--Moby
489 :     Description:
490 :    
491 :     All of these fixes are related to C--, Moby, and my own optimization
492 :     stuff; so they shouldn't affect SML/NJ.
493 :    
494 :     1. X86
495 :    
496 :     Various fixes related floating point, and extensions.
497 :    
498 :     2. Alpha
499 :    
500 :     Some extra patterns related to loads with signed/zero extension
501 :     provided by Fermin.
502 :    
503 :     3. Assembly
504 :    
505 :     When generating assemby, resolve the value of client defined constants,
506 :     instead of generating symbolic values. This is controlled by the
507 :     new flag "asm-resolve-constants", which is default to true.
508 :    
509 :     4. Machine Descriptions
510 :    
511 :     a. The precedence parser was slightly broken when parsing infixr symbols.
512 :     b. The type generalizing code had the bound variables reversed, resulting
513 :     in a problem during arity raising.
514 :     c. Various fixes in machine descriptions.
515 :    
516 :     ----------------------------------------------------------------------
517 : blume 592 Name: Matthias Blume
518 :     Date: 2000/04/03 16:05:00 JST
519 :     Tag: blume_main_v110p26p2_2
520 :     Description:
521 :    
522 :     I eliminated coreEnv from compInfo. Access to the "Core" structure is
523 :     now done via the ordinary static environment that is context to each
524 :     compilation unit.
525 :    
526 :     To this end, I arranged that instead of "structure Core" as "structure
527 :     _Core" is bound in the pervasive environment. Core access is done via
528 :     _Core (which can never be accidentially rebound because _Core is not a
529 :     legal surface-syntax symbol).
530 :    
531 :     The current solution is much cleaner because the core environment is
532 :     now simply part of the pervasive environment which is part of every
533 :     compilation unit's context anyway. In particular, this eliminates all
534 :     special-case handling that was necessary until now in order to deal
535 :     with dynamic and symbolic parts of the core environment.
536 :    
537 :     Remaining hackery (to bind the "magic" symbol _Core) is localized in the
538 :     compilation mananger's bootstrap compiler (actually: in the "init group"
539 :     handling). See the comments in src/system/smlnj/init/init.cmi for
540 :     more details.
541 :    
542 :     I also tried to track down all mentions of "Core" (as string argument
543 :     to Symbol.strSymbol) in the compiler and replaced them with a
544 :     reference to the new CoreSym.coreSym. Seems cleaner since the actual
545 :     name appears in one place only.
546 :    
547 :     Binfile and bootfile format have not changed, but the switchover from
548 :     the old "init.cmi" to the new one is a bit tricky, so I supplied new
549 :     bootfiles anyway.
550 :    
551 :     ----------------------------------------------------------------------
552 : leunga 591 Name: Allen Leung
553 :     Date: 2000/04/02 21:17:00 EST
554 :     Tag: leunga-20000402-mltree
555 :     Description:
556 : leunga 585
557 : leunga 591 1. Renamed the constructor CALL in MLTREE by popular demand.
558 :     2. Added a bunch of files from my repository. These are currently
559 :     used by other non-SMLNJ backends.
560 :    
561 : leunga 576 ----------------------------------------------------------------------
562 : leunga 590 Name: Allen Leung
563 :     Date: 2000/03/31 21:15:00 EST
564 :     Tag: leunga-20000331-aliasing
565 :     Description:
566 :    
567 :     This update contains a rewritten (and hopefully more correct) module
568 :     for extracting aliasing information from CPS.
569 :    
570 :     To turn on this feature:
571 :    
572 :     Compiler.Control.CG.memDisambiguate := true
573 :    
574 :     To pretty print the region information with assembly
575 :    
576 :     Compiler.Control.MLRISC.getFlag "asm-show-region" := true;
577 :    
578 :     To control how many levels of aliasing information are printed, use:
579 :    
580 :     Compiler.Control.MLRISC.getInt "points-to-show-level" := n
581 :    
582 :     The default of n is 3.
583 :    
584 :     ----------------------------------------------------------------------
585 : dbm 589 Name: David MacQueen
586 :     Date: 2000/03/31 11:15:00 EST
587 :     Tag: dbm-20000331-runtime_fix
588 :     Description:
589 :    
590 :     This update contains:
591 :    
592 :     1. runtime/c-lib/c-libraries.c
593 :     includes added in revision 1.2 caused compilation errors on hppa-hpux
594 :    
595 :     2. fix for bug 1556
596 :     system/Basis/Implementation/NJ/internal-signals.sml
597 :    
598 :     ----------------------------------------------------------------------
599 : blume 587 Name: Matthias Blume
600 : blume 588 Date: 2000/03/31 18:00:00 JST
601 :     Tag: blume_main_v110p26p2_1
602 :     Description:
603 :    
604 :     This update contains:
605 :    
606 :     1. A small change to CM's handling of stable libraries:
607 :     CM now maintains one "global" modmap that is used for all stable
608 :     libraries. The use of such a global modmap maximizes sharing and
609 :     minimizes the need for re-traversing parts of environments during
610 :     modmap construction. (However, this has minor impact since modmap
611 :     construction seems to account for just one percent or less of total
612 :     compile time.)
613 :    
614 :     2. I added a "genmap" phase to the statistics. This is where I got the
615 :     "one percent" number (see above).
616 :    
617 :     3. CM's new tool parameter mechanism just became _even_ better. :)
618 :     - The parser understands named parameters and recursive options.
619 :     - The "make" and "shell" tools use these new features.
620 :     (This makes it a lot easier to cascade these tools.)
621 :     - There is a small syntax change: named parameters use a
622 :    
623 :     <name> : ( <option> ... ) or
624 :     <name> : <string>
625 :    
626 :     syntax. Previously, named parameters were implemented in an
627 :     ad-hoc fashion by each tool individually (by parsing strings)
628 :     and had the form
629 :    
630 :     <name>=<string>
631 :    
632 :     See the CM manual for a full description of these issues.
633 :    
634 :     ----------------------------------------------------------------------
635 :     Name: Matthias Blume
636 : blume 587 Date: 2000/03/30 18:00:00 JST
637 :     Tag: blume_main_v110p26p2_0
638 :     Description:
639 :    
640 :     !!!!! WARNING !!!!!!
641 :     !! New binfiles !!
642 :     !!!!!!!!!!!!!!!!!!!!
643 :    
644 :     This update contains:
645 :    
646 :     1. Moderate changes to CM:
647 :    
648 :     - Changes to CM's tools mechanism. In particular, it is now possible
649 :     to have tools that accept additional "command line" parameters
650 :     (specified in the .cm file at each instance where the tool's class is
651 :     used).
652 :    
653 :     This was done to accomodate the new "make" and "shell" tools which
654 :     facilitate fairly seemless hookup to portions of code managed using
655 :     Makefiles or Shell scripts.
656 :    
657 :     There are no classes "shared" or "private" anymore. Instead, the
658 :     sharing annotation is now a parameter to the "sml" class.
659 :    
660 :     There is a bit of generic machinery for implementing one's own
661 :     tools that accept command-line parameters. However, I am not yet fully
662 :     satisfied with that part, so expect changes here in the future.
663 :    
664 :     All existing tools are described in the CM manual.
665 :    
666 :     - Slightly better error handling. (CM now surpresses many followup
667 :     error messages that tended to be more annoying than helpful.)
668 :    
669 :     2. Major changes to the compiler's static environment data structures.
670 :    
671 :     - no CMStaticEnv anymore.
672 :     - no CMEnv, no "BareEnvironment" (actually, _only_ BareEnvironment,
673 :     but it is called Environment), no conversions between different
674 :     kinds of static environments
675 :    
676 :     - There is still a notion of a "modmap", but such modmaps are generated
677 :     on demand at the time when they are needed. This sounds slow, but I
678 :     sped up the code that generates modmaps enough for this not to lead to
679 :     a slowdown of the compiler (at least I didn't detect any).
680 :    
681 :     - To facilitate rapid modmap generation, static environments now
682 :     contain an (optional) "modtree" structure. Modtree annotations are
683 :     constructed by the unpickler during unpickling. (This means that
684 :     the elaborator does not have to worry about modtrees at all.)
685 :     Modtrees have the advantage that they are compositional in the same
686 :     way as the environment data structure itself is compositional.
687 :     As a result, modtrees never hang on to parts of an environment that
688 :     has already been rendered "stale" by filtering or rebinding.
689 :    
690 :     - I went through many, many trials and errors before arriving at the
691 :     current solution. (The initial idea of "linkpaths" did not work.)
692 :     But the result of all this is that I have touched a lot of files that
693 :     depend on the "modules" and "types" data structures (most of the
694 :     elaborator). There were a lot of changes during my "linkpath" trials
695 :     that could have been reverted to their original state but weren't.
696 :     Please, don't be too harsh on me for messing with this code a bit more
697 :     than what was strictly necessary... (I _did_ resist the tempation
698 :     of doing any "global reformatting" to avoid an untimely death at
699 :     Dave's hands. :)
700 :    
701 :     - One positive aspect of the previous point: At least I made sure that
702 :     all files that I touched now compile without warnings (other than
703 :     "polyEqual").
704 :    
705 :     - compiler now tends to run "leaner" (i.e., ties up less memory in
706 :     redundant modmaps)
707 :    
708 :     ----------------------------------------------------------------------
709 : leunga 580 Name: Allen Leung
710 : leunga 585 Date: 2000/03/29 18:00:00
711 :     Tag: leunga-20000327-mlriscGen_hppa_alpha_x86
712 : leunga 586 Boot files (optional): ftp://react-ilp.cs.nyu.edu/leunga/110.26.1-sml.boot.x86-unix-20000330.tar.gz
713 : leunga 585 Description:
714 :    
715 :     This update contains *MAJOR* changes to the way code is generated from CPS
716 :     in the module mlriscGen, and in various backend modules.
717 :    
718 :     CHANGES
719 :     =======
720 :    
721 :     1. MLRiscGen: forward propagation fix.
722 :    
723 :     There was a bug in forward propagation introduced at about the same time
724 :     as the MLRISC x86 backend, which prohibits coalescing to be
725 :     performed effectively in loops.
726 :    
727 :     Effect: speed up of loops in RISC architectures.
728 :     By itself, this actually slowed down certain benchmarks on the x86.
729 :    
730 :     2. MLRiscGen: forward propagating addresses from consing.
731 :    
732 :     I've changed the way consing code is generated. Basically I separated
733 :     out the initialization part:
734 :    
735 :     store tag, offset(allocptr)
736 :     store elem1, offset+4(allocptr)
737 :     store elem2, offset+8(allocptr)
738 :     ...
739 :     store elemn, offset+4n(allocptr)
740 :    
741 :     and the address computation part:
742 :    
743 :     celladdr <- offset+4+alloctpr
744 :    
745 :     and move the address computation part
746 :    
747 :     Effect: register pressure is generally lower as a result. This
748 :     makes compilation of certain expressions much faster, such as
749 :     long lists with non-trivial elements.
750 :    
751 :     [(0,0), (0,0), .... (0,0)]
752 :    
753 :     3. MLRiscGen: base pointer elimination.
754 :    
755 :     As part of the linkage mechanism, we generate the sequence:
756 :    
757 :     L: ... <- start of the code fragment
758 :    
759 :     L1:
760 :     base pointer <- linkreg - L1 + L
761 :    
762 :     The base pointer was then used for computing relocatable addresses
763 :     in the code fragment. Frequently (such as in lots of continuations)
764 :     this is not needed. We now eliminate this sequence whenever possible.
765 :    
766 :     For compile time efficiency, I'm using a very stupid local heuristic.
767 :     But in general, this should be done as a control flow analysis.
768 :    
769 :     Effect: Smaller code size. Speed up of most programs.
770 :    
771 :     4. Hppa back end
772 :    
773 :     Long jumps in span dependence resolution used to depend on the existence
774 :     of the base pointer.
775 :    
776 :     A jump to a long label L was expanded into the following sequence:
777 :    
778 :     LDIL %hi(L-8192), %r29
779 :     LDO %lo(L-8192)(%r29), %r29
780 :     ADD %r29, baseptr, %r29
781 :     BV,n %r0(%r29)
782 :    
783 :     In the presence of change (3) above, this will not work. I've changed
784 :     it so that the following sequence of instructions are generated, which
785 :     doesn't mention the base pointer at all:
786 :    
787 :     BL,n L', %r29 /* branch and link, L' + 4 -> %r29 */
788 :     L': ADDIL L-(L'+4), %r29 /* Compute address of L */
789 :     BV,n %r0(%r29) /* Jump */
790 :    
791 :     5. Alpha back end
792 :    
793 :     New alpha instructions LDB/LDW have been added, as per Fermin's
794 :     suggestions. This is unrelated to all other changes.
795 :    
796 :     6. X86 back end
797 :    
798 :     I've changed andl to testl in the floating point test sequence
799 :     whenever appropriate. The Intel optimization guide states that
800 :     testl is perferable to andl.
801 :    
802 :     7. RA (x86 only)
803 :    
804 :     I've improved the spill propagation algorithm, using an approximation
805 :     of maximal weighted independent sets. This seems to be necessary to
806 :     alleviate the negative effect in light of the slow down in (1).
807 :    
808 :     I'll write down the algorithm one of these days.
809 :    
810 :     8. MLRiscGen: frequencies
811 :    
812 :     I've added an annotation that states that all call gc blocks have zero
813 :     execution frequencies. This improves register allocation on the x86.
814 :    
815 :     BENCHMARKS
816 :     ==========
817 :    
818 :     I've only perform the comparison on 110.25.
819 :    
820 :     The platforms are:
821 :    
822 :     HPPA A four processor HP machine (E9000) with 5G of memory.
823 :     X86 A 300Hhz Pentium II with 128M of memory, and
824 :     SPARC An Ultra sparc 2 with 512M of memory.
825 :    
826 :     I used the following parameters for the SML benchmarks:
827 :    
828 :     @SMLalloc
829 :     HPPA 256k
830 :     SPARC 512k
831 :     X86 256k
832 :    
833 :     COMPILATION TIME
834 :     ----------------
835 :     Here are the numbers comparing the compilation times of the compilers.
836 :     I've only compared 110.25 compiling the new sources versus
837 :     a fixpoint version of the new compiler compiling the same.
838 :    
839 :     110.25 New
840 :     Total Time in RA Spill+Reload Total Time In RA Spill+Reload
841 :     HPPA 627s 116s 2684+3584 599s 95s 1003+1879
842 :     SPARC 892s 173s 2891+3870 708s 116s 1004+1880
843 :     X86 999s 315s 94006+130691 987s 296s 108877+141957
844 :    
845 :     110.25 New
846 :     Code Size Code Size
847 :     HPPA 8596736 8561421
848 :     SPARC 8974299 8785143
849 :     X86 9029180 8716783
850 :    
851 :     So in summary, things are at least as good as before. Dramatic
852 :     reduction in compilation is obtained on the Sparc; I can't explain it,
853 :     but it is reproducible. Perhaps someone should try to reproduce this
854 :     on their own machines.
855 :    
856 :     SML BENCHMARKS
857 :     --------------
858 :    
859 :     On the average, all benchmarks perform at least as well as before.
860 :    
861 :     HPPA Compilation Time Spill+Reload Run Time
862 :     110.25 New 110.25 New 110.25 New
863 :    
864 :     barnesHut 3.158 3.015 4.75% 1+1 0+0 2.980 2.922 2.00%
865 :     boyer 6.152 5.708 7.77% 0+0 0+0 0.218 0.213 2.34%
866 :     count-graphs 1.168 1.120 4.32% 0+0 0+0 22.705 23.073 -1.60%
867 :     fft 0.877 0.792 10.74% 1+3 1+3 0.602 0.587 2.56%
868 :     knuthBendix 3.180 2.857 11.32% 0+0 0+0 0.675 0.662 2.02%
869 :     lexgen 6.190 5.290 17.01% 0+0 0+0 0.913 0.788 15.86%
870 :     life 0.803 0.703 14.22% 25+25 0+0 0.153 0.140 9.52%
871 :     logic 2.048 2.007 2.08% 6+6 1+1 4.133 4.008 3.12%
872 :     mandelbrot 0.077 0.080 -4.17% 0+0 0+0 0.765 0.712 7.49%
873 :     mlyacc 22.932 20.937 9.53% 154+181 32+57 0.468 0.430 8.91%
874 :     nucleic 5.183 5.060 2.44% 2+2 0+0 0.125 0.120 4.17%
875 :     ratio-regions 3.357 3.142 6.84% 0+0 0+0 116.225 113.173 2.70%
876 :     ray 1.283 1.290 -0.52% 0+0 0+0 2.887 2.855 1.11%
877 :     simple 6.307 6.032 4.56% 28+30 5+7 3.705 3.658 1.28%
878 :     tsp 0.888 0.862 3.09% 0+0 0+0 7.040 6.893 2.13%
879 :     vliw 24.378 23.455 3.94% 106+127 25+45 2.758 2.707 1.91%
880 :     --------------------------------------------------------------------------
881 :     Average 6.12% 4.09%
882 :    
883 :     SPARC Compilation Time Spill+Reload Run Time
884 :     110.25 New 110.25 New 110.25 New
885 :    
886 :     barnesHut 3.778 3.592 5.20% 2+2 0+0 3.648 3.453 5.65%
887 :     boyer 6.632 6.110 8.54% 0+0 0+0 0.258 0.242 6.90%
888 :     count-graphs 1.435 1.325 8.30% 0+0 0+0 33.672 34.737 -3.07%
889 :     fft 0.980 0.940 4.26% 3+9 2+6 0.838 0.827 1.41%
890 :     knuthBendix 3.590 3.138 14.39% 0+0 0+0 0.962 0.967 -0.52%
891 :     lexgen 6.593 6.072 8.59% 1+1 0+0 1.077 1.078 -0.15%
892 :     life 0.972 0.868 11.90% 26+26 0+0 0.143 0.140 2.38%
893 :     logic 2.525 2.387 5.80% 7+7 1+1 5.625 5.158 9.05%
894 :     mandelbrot 0.090 0.093 -3.57% 0+0 0+0 0.855 0.728 17.39%
895 :     mlyacc 26.732 23.827 12.19% 162+189 32+57 0.550 0.560 -1.79%
896 :     nucleic 6.233 6.197 0.59% 3+3 0+0 0.163 0.173 -5.77%
897 :     ratio-regions 3.780 3.507 7.79% 0+0 0+0 133.993 131.035 2.26%
898 :     ray 1.595 1.550 2.90% 1+1 0+0 3.440 3.418 0.63%
899 :     simple 6.972 6.487 7.48% 29+32 5+7 3.523 3.525 -0.05%
900 :     tsp 1.115 1.063 4.86% 0+0 0+0 7.393 7.265 1.77%
901 :     vliw 27.765 24.818 11.87% 110+135 25+45 2.265 2.135 6.09%
902 :     ----------------------------------------------------------------------------
903 :     Average 6.94% 2.64%
904 :    
905 :     X86 Compilation Time Spill+Reload Run Time
906 :     110.25 New 110.25 New 110.25 New
907 :    
908 :     barnesHut 5.530 5.420 2.03% 593+893 597+915 3.532 3.440 2.66%
909 :     boyer 8.768 7.747 13.19% 493+199 301+289 0.327 0.297 10.11%
910 :     count-graphs 2.040 2.010 1.49% 298+394 315+457 26.578 28.660 -7.26%
911 :     fft 1.327 1.302 1.92% 112+209 115+210 1.055 0.962 9.71%
912 :     knuthBendix 5.218 5.475 -4.69% 451+598 510+650 0.928 0.932 -0.36%
913 :     lexgen 9.970 9.623 3.60% 1014+841 1157+885 0.947 0.928 1.97%
914 :     life 1.183 1.183 0.00% 162+182 145+148 0.127 0.103 22.58%
915 :     logic 3.285 3.512 -6.45% 514+684 591+836 5.682 5.577 1.88%
916 :     mandelbrot 0.147 0.143 2.33% 38+41 33+54 0.703 0.690 1.93%
917 :     mlyacc 35.457 32.763 8.22% 3496+4564 3611+4860 0.552 0.550 0.30%
918 :     nucleic 7.100 6.888 3.07% 239+168 201+158 0.175 0.173 0.96%
919 :     ratio-regions 6.388 6.843 -6.65% 1182+257 981+300 120.142 120.345 -0.17%
920 :     ray 2.332 2.338 -0.29% 346+398 402+494 3.593 3.540 1.51%
921 :     simple 9.912 9.903 0.08% 1475+941 1579+1168 3.057 3.178 -3.83%
922 :     tsp 1.623 1.532 5.98% 266+200 250+211 8.045 7.878 2.12%
923 :     vliw 33.947 35.470 -4.29% 2629+2774 2877+3171 2.072 1.890 9.61%
924 :     ----------------------------------------------------------------------------
925 :     Average 1.22% 3.36%
926 :    
927 :     ----------------------------------------------------------------------
928 :     Name: Allen Leung
929 : leunga 583 Date: 2000/03/23 16:25:00
930 :     Tag: leunga-20000323-fix_x86_alpha
931 :     Description:
932 :    
933 :     1. X86 fixes/changes
934 :    
935 :     a. The old code generated for SETcc was completely wrong.
936 :     The Intel optimization guide is VERY misleading.
937 :    
938 :     2. ALPHA fixes/changes
939 :    
940 :     a. Added the instructions LDBU, LDWU, STB, STW as per Fermin's suggestion.
941 :     b. Added a new mode byteWordLoadStores to the functor parameter to Alpha()
942 :     c. Added reassociation code for address computation.
943 :    
944 :     ----------------------------------------------------------------------
945 :     Name: Allen Leung
946 : leunga 580 Date: 2000/03/22 01:23:00
947 :     Tag: leunga-20000322-fix_x86_hppa_ra
948 :     Description:
949 :    
950 :     1. X86 fixes/changes
951 :    
952 :     a. x86Rewrite bug with MUL3 (found by Lal)
953 :     b. Added the instructions FSTS, FSTL
954 :    
955 :     2. PA-RISC fixes/changes
956 :    
957 :     a. B label should not be a delay slot candidate! Why did this work?
958 :     b. ADDT(32, REG(32, r), LI n) now generates one instruction instead of two,
959 :     as it should be.
960 :     c. The assembly syntax for fstds and fstdd was wrong.
961 :     d. Added the composite instruction COMICLR/LDO, which is the immediate
962 :     operand variant of COMCLR/LDO.
963 :    
964 :     3. Generic MLRISC
965 :    
966 :     a. shuffle.sml rewritten to be slightly more efficient
967 :     b. DIV bug in mltree-simplify fixed (found by Fermin)
968 :    
969 :     4. Register Allocator
970 :    
971 :     a. I now release the interference graph earlier during spilling.
972 :     May improve memory usage.
973 :    
974 :     ----------------------------------------------------------------------
975 : blume 577 Name: Matthias Blume
976 : blume 578 Date: 2000/03/14 14:15:32
977 :     Tag: blume_main_v110p26p1_2
978 :     Description:
979 :    
980 :     1. Tools.registerStdShellCmdTool (from smlnj/cm/tool.cm) takes an
981 :     additional argument called "template" which is an optional string that
982 :     specifiel the layout of the tool command line. See the CM manual for
983 :     explanation.
984 :    
985 :     2. A special-purpose tool can be "regisitered" by simply dropping the
986 :     corresponding <...>-tool.cm (and/or <...>-ext.cm) into the same
987 :     directory where the .cm file lives that uses this tool. (The
988 :     behavior/misfeature until now was to look for the tool description
989 :     files in the current working directory.) As before, tool description
990 :     files could also be anchored -- in which case they can live anywhere
991 :     they like. Following the recent e-mail discussion, this change should
992 :     make it easier to have special-purpose tools that are shipped together
993 :     with the sources of the program that uses them.
994 :    
995 :     ----------------------------------------------------------------------
996 :     Name: Matthias Blume
997 : blume 577 Date: 2000/03/10 07:48:34
998 :     Tag: blume_main_v110p26p1_1
999 :     Description:
1000 :    
1001 :     I added a re-written version of Dave's fixpt script to src/system.
1002 :     Changes relative to the original version:
1003 :     - sh-ified (not everybody has ksh)
1004 :     - automatically figures out which architecture it runs on
1005 :     - uses ./makeml a bit more cleverly
1006 :     - never invokes ./installml (and, thus, does not clobber your
1007 :     good and working installation of sml in case something goes wrong)
1008 :     - accepts max iteration count using option "-iter <n>"
1009 :     - accepts a "base" name using option "-base <base>"
1010 :    
1011 :     It does not build any extraneous heap images but directly rebuilds
1012 :     bin- and boot-hierarchies using makeml's "-rebuild" switch. Finally,
1013 :     it can incorporate existing bin- and boot- hierarchies. For example,
1014 :     suppose the base is set to "sml" (which is the default). Then it
1015 :     successively builds
1016 :    
1017 :     sml.bin.<arch>-unix and sml.boot.<arch>-unix
1018 :     then sml1.bin.<arch>-unix and sml1.boot.<arch>-unix
1019 :     then sml2.bin.<arch>-unix and sml2.boot.<arch>-unix
1020 :     ...
1021 :     then sml<n>.bin.<arch>-unix and sml<n>.boot.<arch>-unix
1022 :    
1023 :     and so on. If any of these already exist, it will just use what's
1024 :     there. In particular, many people will have the initial set of bin
1025 :     and boot files around, so this saves time for at least one full
1026 :     rebuild. Having sets of the form <base><k>.{bin,boot}.<arch>-unix for
1027 :     <k>=1,2,... is normally not a good idea when invoking fixpt. However,
1028 :     they might be the result of an earlier partial run of fixpt (which
1029 :     perhaps got accidentially killed). In this case, fixpt will quickly
1030 :     move through what exists before continuing where it left off earlier,
1031 :     and, thus, saves a lot of time.
1032 :    
1033 :     ----------------------------------------------------------------------
1034 : leunga 576 Name: Allen Leung
1035 :     Date: 00/03/10 02:20:00
1036 :     Tag: leunga-20000310-fix_x86_asm_ra
1037 :     Description:
1038 : dbm 570
1039 : leunga 576 More assembly output problems involving the indexed addressing mode
1040 :     on the x86 have been found and corrected. Thanks to Fermin Reig for the
1041 :     fix.
1042 :    
1043 :     The interface and implementation of the register allocator have been changed
1044 :     slightly to accommodate the possibility to skip the register allocation
1045 :     phases completely and go directly to memory allocation. This is needed
1046 :     for C-- use.
1047 :    
1048 : dbm 570 ----------------------------------------------------------------------
1049 : blume 572 Name: Matthias Blume
1050 : blume 575 Date: 00/03/09 10:23:53
1051 :     Tag: blume_main_v110p26p1_0
1052 :     Description:
1053 :    
1054 :     * Complete re-organization of library names. Many libraries have been
1055 :     consolidated so that they share the same path anchor. For example,
1056 :     all MLRISC-related libraries are anchored at MLRISC, most libraries that
1057 :     are SML/NJ-specific are under "smlnj". Notice that names like
1058 :     host-cmb.cm or host-compiler.cm no longer exist. See system/README
1059 :     for a complete description of the new naming scheme. Quick reference:
1060 :    
1061 :     host-cmb.cm -> smlnj/cmb.cm
1062 :     host-compiler.cm -> smlnj/compiler.cm
1063 :     full-cm.cm -> smlnj/cm.cm
1064 :     <arch>-<os>.cm -> smlnj/cmb/<arch>-<os>.cm
1065 :     <arch>-compiler.cm -> smlnj/compiler/<arch>.cm
1066 :    
1067 :     * Bug fixes in CM.
1068 :     - exceptions in user code are being passed through (i.e., reach top level)
1069 :     - more bugs in paranoia mode fixed
1070 :     - bug related to checking group owners fixed
1071 :    
1072 :     * New install.sh script that automagically fetches archive files:
1073 :     The new file config/srcarchiveurl must contain the URL of the
1074 :     (remote) directory that contains bin files (or other source archives).
1075 :     If install.sh does not find the archive locally, it tries to get
1076 :     it from that remote directory.
1077 :     This should simplify installation further: For machines that have
1078 :     access to the internet, just fetch <version>-config.tgz, unpack it,
1079 :     edit config/targets, and go (run config/install.sh). The scipt will
1080 :     fetch everything else that it might need all by itself.
1081 :    
1082 :     For CVS users, this mechanism is not relevant for source archives, but
1083 :     it is convenient for getting new sets of binfiles.
1084 :    
1085 :     Archives should be tar files compressed with either gzip, compress, or
1086 :     bzip2. The script recognizes .tgz, .tar, tar.gz, tz, .tar.Z, and .tar.bz2.
1087 :    
1088 :     ----------------------------------------------------------------------
1089 :     Name: Matthias Blume
1090 : blume 572 Date: 2000/03/07 04:01:04
1091 :     Tag: blume_main_v110_26_2
1092 : dbm 570 Description:
1093 : blume 572 - size info in BOOTLIST
1094 :     * no fixed upper limits for number of bootfiles or length of
1095 :     bootfile names in runtime
1096 :     * falling back to old behavior if no BOOTLIST size info found
1097 :     - allocation size heuristics in .run-sml
1098 :     * tries to read cache size from /proc/cpuinfo (this is important for
1099 :     small-cache Celeron systems!)
1100 :     - install.sh robustified
1101 :     - CM manual updates
1102 :     - paranoid mode
1103 :     * no more CMB.deliver() (i.e., all done by CMB.make())
1104 :     * can re-use existing sml.boot.* files
1105 :     * init.cmi now treated as library
1106 :     * library stamps for consistency checks
1107 :     - sml.boot.<arch>-<os>/PIDMAP file
1108 :     * This file is read by the CM startup code. This is used to minimize
1109 :     the amount of dynamic state that needs to be stowed away for the
1110 :     purpose of sharing between interactive system and user code.
1111 :     - CM.Anchor.anchor instead of CM.Anchor.{set,cancel}
1112 :     * Upon request by Elsa. Anchors now controlled by get-set-pair
1113 :     like most other CM state variables.
1114 :     - Compiler.CMSA eliminated
1115 :     * No longer supported by CM anyway.
1116 :     - fixed bugs in pickler that kept biting Stefan
1117 :     * past refs to past refs (was caused by the possibility that
1118 :     ad-hoc sharing is more discriminating than hash-cons sharing)
1119 :     * integer overflow on LargeInt.minInt
1120 :     - ml-{lex,yacc} build scripts now use new mechanism
1121 :     for building standalone programs
1122 :     - fixed several gcc -Wall warnings that were caused by missing header
1123 :     files, missing initializations, etc., in runtime (not all warnings
1124 :     eliminated, though)

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