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minor cleanup to SROA: when lowering type unsafe accesses to

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large integers, the first inserted value would always create
an 'or X, 0'.  Even though this is trivially zapped by
instcombine, don't bother creating this pointless instruction.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106979 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2010-06-27 07:58:26 +00:00
parent 41c9c0ea32
commit 1495247f51
1 changed files with 6 additions and 1 deletions
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7
lib/Transforms/Scalar/ScalarReplAggregates.cpp
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@ -1655,7 +1655,12 @@ void SROA::RewriteLoadUserOfWholeAlloca(LoadInst *LI, AllocaInst *AI,
SrcField = BinaryOperator::CreateShl(SrcField, ShiftVal, "", LI);
}
ResultVal = BinaryOperator::CreateOr(SrcField, ResultVal, "", LI);
// Don't create an 'or x, 0' on the first iteration.
if (!isa<Constant>(ResultVal) ||
!cast<Constant>(ResultVal)->isNullValue())
ResultVal = BinaryOperator::CreateOr(SrcField, ResultVal, "", LI);
else
ResultVal = SrcField;
}
// Handle tail padding by truncating the result