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| author | Evan Cheng <evan.cheng@apple.com> | 2009-01-19 08:08:22 +0000 |
|---|---|---|
| committer | Evan Cheng <evan.cheng@apple.com> | 2009-01-19 08:08:22 +0000 |
| commit | 7e9ef4d7763c8e94d693b298cc8707a3e86af931 (patch) | |
| tree | fb803c0be14c973dbef9cd31ddc6bc88904181fc /llvm/lib/Target | |
| parent | f58e2a9e4759ec2c8ea4e7a7cfd901203d1bcdd7 (diff) | |
| download | bcm5719-llvm-7e9ef4d7763c8e94d693b298cc8707a3e86af931.tar.gz bcm5719-llvm-7e9ef4d7763c8e94d693b298cc8707a3e86af931.zip | |
Now not UINT_TO_FP is legal (it's marked custom), dag combiner won't
optimize it to a SINT_TO_FP when the sign bit is known zero. X86 isel should perform the optimization itself.
llvm-svn: 62504
Diffstat (limited to 'llvm/lib/Target')
| -rw-r--r-- | llvm/lib/Target/X86/X86ISelLowering.cpp | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/llvm/lib/Target/X86/X86ISelLowering.cpp b/llvm/lib/Target/X86/X86ISelLowering.cpp index 544b71cf8f8..0f5103b5c67 100644 --- a/llvm/lib/Target/X86/X86ISelLowering.cpp +++ b/llvm/lib/Target/X86/X86ISelLowering.cpp @@ -4884,8 +4884,15 @@ SDValue X86TargetLowering::LowerUINT_TO_FP_i32(SDValue Op, SelectionDAG &DAG) { } SDValue X86TargetLowering::LowerUINT_TO_FP(SDValue Op, SelectionDAG &DAG) { - MVT SrcVT = Op.getOperand(0).getValueType(); + SDValue N0 = Op.getOperand(0); + + // Now not UINT_TO_FP is legal (it's marked custom), dag combiner won't + // optimize it to a SINT_TO_FP when the sign bit is known zero. Perform + // the optimization here. + if (DAG.SignBitIsZero(N0)) + return DAG.getNode(ISD::SINT_TO_FP, Op.getValueType(), N0); + MVT SrcVT = N0.getValueType(); if (SrcVT == MVT::i64) { // We only handle SSE2 f64 target here; caller can handle the rest. if (Op.getValueType() != MVT::f64 || !X86ScalarSSEf64) |
