diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/Target/X86/X86ISelDAGToDAG.cpp | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/lib/Target/X86/X86ISelDAGToDAG.cpp b/lib/Target/X86/X86ISelDAGToDAG.cpp index 9b42d00b65..c1d886c32f 100644 --- a/lib/Target/X86/X86ISelDAGToDAG.cpp +++ b/lib/Target/X86/X86ISelDAGToDAG.cpp @@ -1381,9 +1381,10 @@ SDNode *X86DAGToDAGISel::Select(SDValue N) { SDValue Tmp0, Tmp1, Tmp2, Tmp3; bool foldedLoad = TryFoldLoad(N, N1, Tmp0, Tmp1, Tmp2, Tmp3); + bool signBitIsZero = CurDAG->SignBitIsZero(N0); SDValue InFlag; - if (NVT == MVT::i8 && !isSigned) { + if (NVT == MVT::i8 && (!isSigned || signBitIsZero)) { // Special case for div8, just use a move with zero extension to AX to // clear the upper 8 bits (AH). SDValue Tmp0, Tmp1, Tmp2, Tmp3, Move, Chain; @@ -1405,7 +1406,7 @@ SDNode *X86DAGToDAGISel::Select(SDValue N) { InFlag = CurDAG->getCopyToReg(CurDAG->getEntryNode(), LoReg, N0, SDValue()).getValue(1); - if (isSigned && !CurDAG->SignBitIsZero(N0)) { + if (isSigned && !signBitIsZero) { // Sign extend the low part into the high part. InFlag = SDValue(CurDAG->getTargetNode(SExtOpcode, MVT::Flag, InFlag), 0); |