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InstCombine: Clean up foldLogOpOfMaskedICmps

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No functional change intended.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@222229 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
David Majnemer
2014-11-18 09:31:36 +00:00
parent 0d7de42c25
commit 2c906a4607
1 changed files with 14 additions and 16 deletions
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12
lib/Transforms/InstCombine/InstCombineAndOrXor.cpp
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@@ -766,18 +766,16 @@ static Value* foldLogOpOfMaskedICmps(ICmpInst *LHS, ICmpInst *RHS, bool IsAnd,
// with B and D, having a single bit set
ConstantInt *CCst = dyn_cast<ConstantInt>(C);
if (!CCst) return nullptr;
if (LHSCC != NEWCC)
CCst = dyn_cast<ConstantInt>( ConstantExpr::getXor(BCst, CCst) );
ConstantInt *ECst = dyn_cast<ConstantInt>(E);
if (!ECst) return nullptr;
if (LHSCC != NEWCC)
CCst = cast<ConstantInt>(ConstantExpr::getXor(BCst, CCst));
if (RHSCC != NEWCC)
ECst = dyn_cast<ConstantInt>( ConstantExpr::getXor(DCst, ECst) );
ConstantInt* MCst = dyn_cast<ConstantInt>(
ConstantExpr::getAnd(ConstantExpr::getAnd(BCst, DCst),
ConstantExpr::getXor(CCst, ECst)) );
ECst = cast<ConstantInt>(ConstantExpr::getXor(DCst, ECst));
// if there is a conflict we should actually return a false for the
// whole construct
if (!MCst->isZero())
if (((BCst->getValue() & DCst->getValue()) &
(CCst->getValue() ^ ECst->getValue())) != 0)
return nullptr;
Value *newOr1 = Builder->CreateOr(B, D);
Value *newOr2 = ConstantExpr::getOr(CCst, ECst);