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Added InstCombine for "select cond, ~cond, x" type patterns

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These can be reduced to "~cond & x" or "~cond | x"

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@146624 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Pete Cooper
2011-12-15 00:56:45 +00:00
parent 4e0adfa7f7
commit 4e5a1ab10b
2 changed files with 27 additions and 0 deletions
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7
lib/Transforms/InstCombine/InstCombineSelect.cpp
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@@ -682,6 +682,13 @@ Instruction *InstCombiner::visitSelectInst(SelectInst &SI) {
return BinaryOperator::CreateOr(CondVal, FalseVal);
else if (CondVal == FalseVal)
return BinaryOperator::CreateAnd(CondVal, TrueVal);
// select a, ~a, b -> (~a)&b
// select a, b, ~a -> (~a)|b
if (match(TrueVal, m_Not(m_Specific(CondVal))))
return BinaryOperator::CreateAnd(TrueVal, FalseVal);
else if (match(FalseVal, m_Not(m_Specific(CondVal))))
return BinaryOperator::CreateOr(TrueVal, FalseVal);
}
// Selecting between two integer constants?