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| author | Evan Cheng <evan.cheng@apple.com> | 2009-01-19 19:06:11 +0000 |
|---|---|---|
| committer | Evan Cheng <evan.cheng@apple.com> | 2009-01-19 19:06:11 +0000 |
| commit | 44cc554311f9d068e474bf7bd05d849059308782 (patch) | |
| tree | a939a93eda8aa606f62c7782a325fd81cf6e3d8a /llvm/lib/Target | |
| parent | 0346c04f391502bb7ca093a22a6c057cf9b9249d (diff) | |
| download | bcm5719-llvm-44cc554311f9d068e474bf7bd05d849059308782.tar.gz bcm5719-llvm-44cc554311f9d068e474bf7bd05d849059308782.zip | |
DIVREM isel deficiency: If sign bit is known zero, zero out DX/EDX/RDX instead of sign extending the low part (in AX/EAX/RAX) into it.
llvm-svn: 62519
Diffstat (limited to 'llvm/lib/Target')
| -rw-r--r-- | llvm/lib/Target/X86/X86ISelDAGToDAG.cpp | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/llvm/lib/Target/X86/X86ISelDAGToDAG.cpp b/llvm/lib/Target/X86/X86ISelDAGToDAG.cpp index 842bb13ae82..9b42d00b654 100644 --- a/llvm/lib/Target/X86/X86ISelDAGToDAG.cpp +++ b/llvm/lib/Target/X86/X86ISelDAGToDAG.cpp @@ -1405,7 +1405,7 @@ SDNode *X86DAGToDAGISel::Select(SDValue N) { InFlag = CurDAG->getCopyToReg(CurDAG->getEntryNode(), LoReg, N0, SDValue()).getValue(1); - if (isSigned) { + if (isSigned && !CurDAG->SignBitIsZero(N0)) { // Sign extend the low part into the high part. InFlag = SDValue(CurDAG->getTargetNode(SExtOpcode, MVT::Flag, InFlag), 0); |
