diff options
Diffstat (limited to 'llvm/lib/Transforms/Utils')
| -rw-r--r-- | llvm/lib/Transforms/Utils/SimplifyCFG.cpp | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/llvm/lib/Transforms/Utils/SimplifyCFG.cpp b/llvm/lib/Transforms/Utils/SimplifyCFG.cpp index b6d87c22e43..57adcecbdfb 100644 --- a/llvm/lib/Transforms/Utils/SimplifyCFG.cpp +++ b/llvm/lib/Transforms/Utils/SimplifyCFG.cpp @@ -405,13 +405,14 @@ private: ConstantInt *RHSC; // Pattern match a special case - // (x & ~2^x) == y --> x == y || x == y|2^x + // (x & ~2^z) == y --> x == y || x == y|2^z // This undoes a transformation done by instcombine to fuse 2 compares. if (ICI->getPredicate() == (isEQ ? ICmpInst::ICMP_EQ:ICmpInst::ICMP_NE)) { if (match(ICI->getOperand(0), m_And(m_Value(RHSVal), m_ConstantInt(RHSC)))) { APInt Not = ~RHSC->getValue(); - if (Not.isPowerOf2()) { + if (Not.isPowerOf2() && C->getValue().isPowerOf2() && + Not != C->getValue()) { // If we already have a value for the switch, it has to match! if(!setValueOnce(RHSVal)) return false; |
