fefd0202c9
Correctly fold divide-by-constant, even when faced with overflow.
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llvm-svn: 47287
2008-02-18 22:48:05 +00:00
1e3c501cb8
Transforming -A + -B --> -(A + B) isn't safe for FP, thanks
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to Dale for noticing this!
llvm-svn: 47276
2008-02-18 17:50:16 +00:00
0af5601028
minor code simplification, no functionality change.
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llvm-svn: 47275
2008-02-18 17:47:29 +00:00
85fab3a3ad
Simplify caller updating using a CallSite, as
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requested by Chris. While there, do the same
for an existing function committed by someone
called "lattner" :)
llvm-svn: 47273
2008-02-18 17:32:13 +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
6b39cb907b
switch simplifycfg from using vectors for most things to smallvectors,
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this speeds it up 2.3% on eon.
llvm-svn: 47261
2008-02-18 07:42:56 +00:00
024f8c8f09
optimize away stackrestore calls that have no intervening alloca or call.
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llvm-svn: 47258
2008-02-18 06:12:38 +00:00
0e7fd2f1a8
simplify some code, BreakUpSubtract always returns nonnull now.
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llvm-svn: 47251
2008-02-18 02:18:25 +00:00
cc22601bc3
Fold (-x + -y) -> -(x+y) which promotes better association, fixing
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the second half of PR2047
llvm-svn: 47244
2008-02-17 21:03:36 +00:00
5f08ec854f
fix pasto
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llvm-svn: 47242
2008-02-17 20:54:40 +00:00
a70d138457
Split up subtracts into add+negate if they have a reassociable use or operand
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that is also a subtract. This implements PR2047 and Transforms/Reassociate/subtest2.ll
llvm-svn: 47241
2008-02-17 20:51:26 +00:00
902537cd8d
make the logic for breaking up subtracts more explicit, no
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functionality change.
llvm-svn: 47239
2008-02-17 20:44:51 +00:00
573b3f89e4
Remove any 'nest' parameter attributes if the function
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is not passed as an argument to a trampoline intrinsic.
llvm-svn: 47220
2008-02-16 20:56:04 +00:00
a42c3147cc
Fix PR2028
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llvm-svn: 47150
2008-02-15 01:24:49 +00:00
2e622e4c2b
If loop header is also loop exiting block then OrigPN is incoming value for B loop header.
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Fixes PR 2030.
llvm-svn: 47141
2008-02-14 23:18:47 +00:00
70e294660a
Fix PR2029
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llvm-svn: 47129
2008-02-14 19:18:13 +00:00
89acd61805
simplify code, no functionality change.
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llvm-svn: 47116
2008-02-14 07:39:01 +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
0ecb76d820
A loop latch phi node may have uses inside loop, not just in loop header.
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llvm-svn: 47093
2008-02-13 22:23:07 +00:00
1ee8dc97d9
Rename APInt's isPositive to isNonNegative, to reflect what it
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actually does.
llvm-svn: 47090
2008-02-13 22:09:18 +00:00
22c3caab6e
While moving exit condition, do not drop loop latch on the floor.
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llvm-svn: 47089
2008-02-13 22:06:36 +00:00
c281d8031b
Keep track of exit value operand number when operands are swapped.
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llvm-svn: 47082
2008-02-13 19:48:48 +00:00
67b9ef7be8
remove some dead code.
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llvm-svn: 47066
2008-02-13 17:18:26 +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
dcddd64424
Fix scalarrepl to not 'miscompile' undefined code, part #2 .
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This fixes the store case, my previous patch just fixed the load
case. rdar://5707076.
llvm-svn: 46932
2008-02-10 19:05:37 +00:00
26f75e2576
Fix PR 1995.
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llvm-svn: 46898
2008-02-08 22:49:13 +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
a838141957
Make RenamePass faster by making the 'is this a new phi node'
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check more intelligent. This speeds up mem2reg from 5.29s to
0.79s on a synthetic testcase with tons of predecessors and
phi nodes.
llvm-svn: 46767
2008-02-05 21:26:23 +00:00
682a7dc653
Fix a bug compiling PR1978 (perhaps not the only one though) which
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was incorrectly simplifying "x == (gep x, 1, i)" into false, even
though i could be negative. As it turns out, all the code to
handle this already existed, we just need to disable the incorrect
optimization case and let the general case handle it.
llvm-svn: 46739
2008-02-05 04:45:32 +00:00
a82c9931f4
Be more precise when eliminating pointers bue to memcpy's. This allows more
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stores to be deleted in some cases.
llvm-svn: 46694
2008-02-04 04:53:00 +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
3b59214320
There are some cases where icmp(add) can be folded into a new icmp. Handle them.
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llvm-svn: 46687
2008-02-03 16:33:09 +00:00
c7a4ba044b
Hack on vectors too.
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llvm-svn: 46684
2008-02-03 08:19:11 +00:00
e6e3a7f6ea
Fold away one multiply in instcombine. This would normally be caught in
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reassociate anyways, but they could be generated during instcombine's run.
llvm-svn: 46683
2008-02-03 07:42:09 +00:00
9aa789fda3
Don't drop function/call return attributes like 'nounwind'.
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llvm-svn: 46645
2008-02-01 20:37:16 +00:00
6b016703a9
Remove a couple more cases of "getNumUses() == 0". No need to walk the linked
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list just to see if whether the list is empty.
llvm-svn: 46555
2008-01-30 08:01:28 +00:00
625e89c8b0
Use empty() instead of comparing size() with zero.
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llvm-svn: 46554
2008-01-30 07:54:16 +00:00
0e3a5cb14a
Don't DCE FreeInst's. We were using those! Patch from Owen Anderson.
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llvm-svn: 46553
2008-01-30 07:45:37 +00:00
4e4b116750
Make DSE much more aggressive by performing DCE earlier. Update a testcase to reflect this increased aggressiveness.
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llvm-svn: 46542
2008-01-30 01:24:47 +00:00
b9e5b8fb9e
Fix a bug where scalarrepl would discard offset if type would match.
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In practice this can only happen on code with already undefined behavior,
but this is still a good thing to handle correctly.
llvm-svn: 46539
2008-01-30 00:39:15 +00:00
ade0abb498
Don't let globalopt hack on volatile loads or stores.
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llvm-svn: 46523
2008-01-29 19:01:37 +00:00
70de4cb1cd
Use empty() instead of comparing size() with zero.
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llvm-svn: 46514
2008-01-29 13:02:09 +00:00
17819d971e
eliminate additions of 0.0 when they are obviously dead. This has to be careful to
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avoid turning -0.0 + 0.0 -> -0.0 which is incorrect.
llvm-svn: 46499
2008-01-29 06:52:45 +00:00
48d37806e2
Add support for eliminating memcpy's at the end of functions. Also fix some errors I noticed in
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the handling of eliminating stores to byval arguments.
llvm-svn: 46494
2008-01-29 06:18:36 +00:00
67fa0521b6
Filter loops that subtract induction variables.
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These loops are not yet handled.
Fix PR 1912.
llvm-svn: 46484
2008-01-29 02:20:41 +00:00
a8b4a56061
Transform calls to memcpy into llvm.memcpy calls, patch by Eli Friedman.
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llvm-svn: 46433
2008-01-28 04:41:43 +00:00
8ea81e8ba4
Handle some more combinations of extend and icmp. Fixes PR1940.
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llvm-svn: 46431
2008-01-28 03:48:02 +00:00
710b441174
Fix PR1932 by disabling an xform invalid for fdiv.
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llvm-svn: 46429
2008-01-28 00:58:18 +00:00
1b706dd680
Fix PR1938 by forcing the code that uses an undefined value to branch one
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way or the other. Rewriting the code itself prevents subsequent analysis
passes from making contradictory conclusions about the code that could
cause an infeasible path to be made feasible.
llvm-svn: 46427
2008-01-28 00:32:30 +00:00
Nick Lewycky