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fix a logic bug where we wouldn't promote single store allocas if the

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stored value was a non-instruction value.  Doh.

This increase the # single store allocas from 8982 to 9026, and
speeds up mem2reg on the testcase in PR1432 from 2.17 to 2.13s.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@40813 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2007-08-04 02:45:02 +00:00
parent 4f63e76cda
commit c69e491575
1 changed files with 2 additions and 2 deletions
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4
lib/Transforms/Utils/PromoteMemoryToRegister.cpp
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@ -557,7 +557,7 @@ void PromoteMem2Reg::RewriteSingleStoreAlloca(AllocaInst *AI,
// do so now. We can't handle the case where the store doesn't dominate a // do so now. We can't handle the case where the store doesn't dominate a
// block because there may be a path between the store and the use, but we // block because there may be a path between the store and the use, but we
// may need to insert phi nodes to handle dominance properly. // may need to insert phi nodes to handle dominance properly.
if (StoringGlobalVal || !dominates(OnlyStore->getParent(), UseBlock)) if (!StoringGlobalVal && !dominates(OnlyStore->getParent(), UseBlock))
continue; continue;
// If the use and store are in the same block, do a quick scan to // If the use and store are in the same block, do a quick scan to
@ -569,7 +569,7 @@ void PromoteMem2Reg::RewriteSingleStoreAlloca(AllocaInst *AI,
break; break;
} }
if (&*I != OnlyStore) if (&*I != OnlyStore)
break; // Do not handle this alloca. continue; // Do not promote the uses of this in this block.
} }
// Otherwise, if this is a different block or if all uses happen // Otherwise, if this is a different block or if all uses happen