40dca46ddb
Fix an issue where GVN would try to use an instruction before its definition when performing return slot optimization.
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llvm-svn: 47541
2008-02-25 00:40:41 +00:00
1bfd121321
Make Transforms to be 4.3 warnings-clean
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llvm-svn: 47371
2008-02-20 11:26:25 +00:00
b4724dbda2
When performing return slot optimization, remember to inform memdep when we're removing the memcpy.
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llvm-svn: 47364
2008-02-20 08:23:02 +00:00
e92e303582
Refactor this method a bit, and correct a test that was completely wrong but happened to work out anyways. :-)
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llvm-svn: 47321
2008-02-19 07:07:51 +00:00
f7b7ba9c5a
isa+cast -> dyncast.
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llvm-svn: 47320
2008-02-19 06:53:20 +00:00
c130e3afc4
simplify this code again, try 2 :)
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llvm-svn: 47319
2008-02-19 06:52:38 +00:00
e71d6e37b2
Fix a comment.
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llvm-svn: 47318
2008-02-19 06:51:23 +00:00
806cbde53b
Major improvements to yesterday's return slot optimization. Remove some unneccessary constraints,
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and add some others that should have been in from the first place. Document the whole thing better.
llvm-svn: 47315
2008-02-19 06:35:43 +00:00
c0c3cd8e27
Factor the profitability check for return slot optimization out into a static function.
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At some point in the future, this check will become smarter.
llvm-svn: 47310
2008-02-19 03:27:34 +00:00
551b8eeb5c
An sret parameter is required to be the first parameter, so there's no need to loop
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over all the parameters of the callee looking for it.
llvm-svn: 47309
2008-02-19 03:15:29 +00:00
336824f102
Cleanup some of my patches from yesterday. Refactor the check for which xform
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to apply to a memcpy into processInstruction. Also, fix a bug in the check due to
missing braces.
llvm-svn: 47307
2008-02-19 03:09:45 +00:00
ffca8e99b2
Fix Transforms/GVN/memcpy.ll, which Chris broke in r47275 by reordering the branches. memcpy's are a kind of CallInst.
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llvm-svn: 47305
2008-02-19 02:53:23 +00:00
0af5601028
minor code simplification, no functionality change.
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llvm-svn: 47275
2008-02-18 17:47:29 +00:00
3549553262
Add support to GVN for performing sret return slot optimization. This means that, if an sret function tail calls
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another sret function, it should pass its own sret parameter to the tail callee, allowing it to fill in the correct
return value. llvm-gcc does not emit this by default. Instead, it allocates space in the caller for the sret of
the tail call and then uses memcpy to copy the result into the caller's sret parameter. This optimization detects
and optimizes that case.
llvm-svn: 47265
2008-02-18 09:24:53 +00:00
7c77e2bc65
Fix PR2032. Inform the alias analysis of changes to the underlying program.
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llvm-svn: 47111
2008-02-14 07:11:24 +00:00
00dba4f734
Re-apply the patch to improve the optimizations of memcpy's, with several
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bugs fixed. This now passes PPC bootstrap.
llvm-svn: 47026
2008-02-12 21:15:18 +00:00
716c10c01e
Fix for bug 1996: optimize out loads of undef. This code basically just
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checks for a malloc/alloca immediately followed by a load.
llvm-svn: 47006
2008-02-12 12:08:14 +00:00
c676a0329c
Temporarily reverting:
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http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20080128/057882.html
This is causing a miscompilation on PPC G5 and just now seeing it on iMac x86-64.
llvm-svn: 46822
2008-02-06 20:03:07 +00:00
c4a7c41869
Allow GVN to hack on memcpy's, making them open to further optimization.
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llvm-svn: 46693
2008-02-04 02:59:58 +00:00
f3ebc3f3d2
Remove attribution from file headers, per discussion on llvmdev.
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llvm-svn: 45418
2007-12-29 20:36:04 +00:00
086b2c4537
Fix several cache coherence bugs in MemDep/GVN that were found. Also add some (disabled) debugging code
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to make such problems easier to diagnose in the future, written by Duncan Sands.
llvm-svn: 44695
2007-12-08 01:37:09 +00:00
68b6f50938
Integrate the readonly/readnone logic more deeply
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into alias analysis. This meant updating the API
which now has versions of the getModRefBehavior,
doesNotAccessMemory and onlyReadsMemory methods
which take a callsite parameter. These should be
used unless the callsite is not known, since in
general they can do a better job than the versions
that take a function. Also, users should no longer
call the version of getModRefBehavior that takes
both a function and a callsite. To reduce the
chance of misuse it is now protected.
llvm-svn: 44487
2007-12-01 07:51:45 +00:00
ffa55112e0
Fix a miscompilation in spiff on PPC.
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llvm-svn: 44437
2007-11-29 18:02:22 +00:00
9f0b6e9d46
Fix another bug that was causing siod to fail.
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llvm-svn: 44325
2007-11-26 07:17:19 +00:00
4f833c7610
Allow GVN to eliminate read-only function calls when it can detect that they are redundant.
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llvm-svn: 44323
2007-11-26 02:26:36 +00:00
09b83ba6f1
Allow GVN to eliminate redundant calls to functions without side effects.
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llvm-svn: 43147
2007-10-18 19:39:33 +00:00
46da2a6262
Add partial caching of non-local memory dependence queries. This provides a modest
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speedup for GVN.
llvm-svn: 42185
2007-09-21 03:53:52 +00:00
0625bd6472
Merge DenseMapKeyInfo & DenseMapValueInfo into DenseMapInfo
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Add a new DenseMapInfo::isEqual method to allow clients to redefine
the equality predicate used when probing the hash table.
llvm-svn: 42042
2007-09-17 18:34:04 +00:00
4cd516b50b
Be more careful when constant-folding PHI nodes.
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llvm-svn: 41998
2007-09-16 08:04:16 +00:00
f5023a7a84
Factor out some code into a helper function.
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llvm-svn: 41131
2007-08-16 22:51:56 +00:00
221a43604e
Add some more comments to GVN.
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llvm-svn: 41129
2007-08-16 22:02:55 +00:00
bc271a02fd
Eliminate PHI nodes with constant values during normal GVN processing, even when
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they're not related to eliminating a load.
llvm-svn: 41081
2007-08-14 18:33:27 +00:00
398602a6eb
Be more aggressive in pruning unnecessary PHI nodes when doing PHI construction.
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llvm-svn: 41080
2007-08-14 18:16:29 +00:00
676070d503
Make GVN iterative.
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llvm-svn: 41078
2007-08-14 18:04:11 +00:00
a7b220f23a
Fix a case where GVN was failing to return true when it had, in fact, modified
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the function.
llvm-svn: 41077
2007-08-14 17:59:48 +00:00
9b1cc8cac0
Make NonLocal and None const in the right way. :-)
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llvm-svn: 40961
2007-08-09 04:42:44 +00:00
b84d3b1c92
Change the None and NonLocal markers in memdep to be const.
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llvm-svn: 40946
2007-08-08 21:39:39 +00:00
0cc1a76283
Don't insert nearly as many redundant phi nodes.
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llvm-svn: 40909
2007-08-07 23:12:31 +00:00
2d19aae4ca
Fix a subtle miscompilation. This allows 197.parser to be compiled correctly.
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llvm-svn: 40791
2007-08-03 19:59:35 +00:00
774761c503
Fix a subtle iterator invalidation bug in a recursive algorithm.
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llvm-svn: 40776
2007-08-03 11:03:26 +00:00
9699a6ea03
Fix 80 col. violations.
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llvm-svn: 40750
2007-08-02 18:16:06 +00:00
0ac1fc8ac1
Fix a bug that was causing several miscompilations on SPEC.
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llvm-svn: 40746
2007-08-02 17:56:05 +00:00
c321e5e272
Make non-local memdep not be recursive, and fix a bug on 403.gcc that this exposed.
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llvm-svn: 40692
2007-08-01 22:01:54 +00:00
10ffa860d8
Don't let the memory allocator outsmart GVN. ;-)
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llvm-svn: 40655
2007-07-31 23:27:13 +00:00
2464f4f048
Fix a failure I accidentally caused in my last commit by mishandling the
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removal of redundant phis.
llvm-svn: 40650
2007-07-31 20:18:28 +00:00
d58fa6b09f
Fix a misoptimization in aha.
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llvm-svn: 40642
2007-07-31 17:43:14 +00:00
850138157e
Avoid potential iterator invalidation problems.
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llvm-svn: 40607
2007-07-30 21:26:39 +00:00
212d5c27f6
Use more caching when computing non-local dependence. This makes bzip2 not
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use up the entire 32-bit address space.
llvm-svn: 40596
2007-07-30 17:29:24 +00:00
d66e285b2e
Fix a bug caused by indiscriminantly asking for the dominators of a predecessor.
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llvm-svn: 40595
2007-07-30 16:57:08 +00:00
dbf23ccaa0
Fix a couple more bugs in the phi construction by pulling in code that does
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almost the same things from LCSSA.
llvm-svn: 40540
2007-07-26 18:26:51 +00:00
Owen Anderson