376597c13e
Remove r111665, which implemented store-narrowing in InstCombine. Chris discovered a miscompilation in it, and it's not easily
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fixable at the optimizer level. I'll investigate reimplementing it in DAGCombine.
llvm-svn: 112575
2010-08-31 04:41:06 +00:00
84c29a096b
Re-apply r111568 with a fix for the clang self-host.
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llvm-svn: 111665
2010-08-20 18:24:43 +00:00
43057cd56a
Revert r111568 to unbreak clang self-host.
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llvm-svn: 111571
2010-08-19 23:25:16 +00:00
bb723b228a
When a set of bitmask operations, typically from a bitfield initialization, only modifies the low bytes of a value,
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we can narrow the store to only over-write the affected bytes.
llvm-svn: 111568
2010-08-19 22:15:40 +00:00
3619660529
Make instcombine set explicit alignments on load or store
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instructions with alignment 0, so that subsequent passes don't
need to bother checking the TargetData ABI size manually.
llvm-svn: 110128
2010-08-03 18:20:32 +00:00
dde79d8f1a
mass elimination of reliance on automatic iterator dereferencing
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llvm-svn: 109103
2010-07-22 13:36:47 +00:00
1b787df129
cache result of operator*
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llvm-svn: 108150
2010-07-12 15:48:26 +00:00
60a346d0f1
do not repeatedly dereference use_iterator
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llvm-svn: 107962
2010-07-09 12:23:50 +00:00
826bdf8c10
Move FindAvailableLoadedValue isSafeToLoadUnconditionally out of
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lib/Transforms/Utils and into lib/Analysis so that Analysis passes
can use them.
llvm-svn: 104949
2010-05-28 16:19:17 +00:00
df5d7dcef1
Teach instcombine to promote alloca array sizes.
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llvm-svn: 104945
2010-05-28 15:09:00 +00:00
19d0b47b1f
There are two ways of checking for a given type, for example isa<PointerType>(T)
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and T->isPointerTy(). Convert most instances of the first form to the second form.
Requested by Chris.
llvm-svn: 96344
2010-02-16 11:11:14 +00:00
9dff9bec31
Uniformize the names of type predicates: rather than having isFloatTy and
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isInteger, we now have isFloatTy and isIntegerTy. Requested by Chris!
llvm-svn: 96223
2010-02-15 16:12:20 +00:00
56600a15ad
Check alignment of loads when deciding whether it is safe to execute them
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unconditionally. Besides checking the offset, also check that the underlying
object is aligned as much as the load itself.
llvm-svn: 94875
2010-01-30 04:42:39 +00:00
4b71b6c179
Use more specific types to avoid casts. No functionality change.
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llvm-svn: 94863
2010-01-30 00:41:10 +00:00
1b8453067b
Preserve load alignment in instcombine transformations. I've been unable to
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create a testcase where this matters. The select+load transformation only
occurs when isSafeToLoadUnconditionally is true, and in those situations,
instcombine also changes the underlying objects to be aligned. This seems
like a good idea regardless, and I've verified that it doesn't pessimize
the subsequent realignment.
llvm-svn: 94850
2010-01-29 22:39:21 +00:00
7c42b9d51e
Improve isSafeToLoadUnconditionally to recognize that GEPs with constant
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indices are safe if the result is known to be within the bounds of the
underlying object.
llvm-svn: 94829
2010-01-29 19:19:08 +00:00
5f8c8c034a
Keep ignoring pointer-to-pointer bitcasts
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llvm-svn: 94194
2010-01-22 19:05:05 +00:00
5f5abd598c
No need to look through bitcasts for DbgInfoIntrinsic
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llvm-svn: 94112
2010-01-21 23:07:15 +00:00
84bd316bd6
Fix comment.
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llvm-svn: 93831
2010-01-19 01:20:15 +00:00
a65e2f7304
split out load/store/alloca.
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llvm-svn: 92685
2010-01-05 05:57:49 +00:00
Owen Anderson