diff options
Diffstat (limited to 'llvm/lib/Target/X86/X86ISelDAGToDAG.cpp')
| -rw-r--r-- | llvm/lib/Target/X86/X86ISelDAGToDAG.cpp | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/llvm/lib/Target/X86/X86ISelDAGToDAG.cpp b/llvm/lib/Target/X86/X86ISelDAGToDAG.cpp index 84b1f9624ad..eb0107a5fa4 100644 --- a/llvm/lib/Target/X86/X86ISelDAGToDAG.cpp +++ b/llvm/lib/Target/X86/X86ISelDAGToDAG.cpp @@ -3025,7 +3025,10 @@ void X86DAGToDAGISel::Select(SDNode *Node) { } // For example, "testl %eax, $32776" to "testw %ax, $32776". - if (isUInt<16>(Mask) && N0.getValueType() != MVT::i16 && + // NOTE: We only want to form TESTW instructions if optimizing for + // min size. Otherwise we only save one byte and possibly get a length + // changing prefix penalty in the decoders. + if (OptForMinSize && isUInt<16>(Mask) && N0.getValueType() != MVT::i16 && (!(Mask & 0x8000) || hasNoSignedComparisonUses(Node))) { SDValue Imm = CurDAG->getTargetConstant(Mask, dl, MVT::i16); SDValue Reg = N0.getOperand(0); |
