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InstCombine: Make sure we use the pre-zext type when creating a constant of a value that is zext'd.

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Fixes PR13250.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@164377 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Benjamin Kramer
2012-09-21 16:26:41 +00:00
parent 30b483c940
commit e5bd3cf000
2 changed files with 16 additions and 1 deletions
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3
lib/Transforms/InstCombine/InstCombineMulDivRem.cpp
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@@ -477,7 +477,8 @@ Instruction *InstCombiner::visitUDiv(BinaryOperator &I) {
if (match(Op1, m_Shl(m_Power2(CI), m_Value(N))) ||
match(Op1, m_ZExt(m_Shl(m_Power2(CI), m_Value(N))))) {
if (*CI != 1)
N = Builder->CreateAdd(N, ConstantInt::get(I.getType(),CI->logBase2()));
N = Builder->CreateAdd(N,
ConstantInt::get(N->getType(), CI->logBase2()));
if (ZExtInst *Z = dyn_cast<ZExtInst>(Op1))
N = Builder->CreateZExt(N, Z->getDestTy());
if (I.isExact())