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| author | Chris Lattner <sabre@nondot.org> | 2008-01-25 06:14:17 +0000 |
|---|---|---|
| committer | Chris Lattner <sabre@nondot.org> | 2008-01-25 06:14:17 +0000 |
| commit | 470d5dc2410dd693a11a3c572fe1c5f40c800110 (patch) | |
| tree | e4f305f841643da7d1002fd7c626005d75a88de9 /lib | |
| parent | f82998f868ae995b43eab3fd884829852416ac75 (diff) | |
| download | external_llvm-470d5dc2410dd693a11a3c572fe1c5f40c800110.zip external_llvm-470d5dc2410dd693a11a3c572fe1c5f40c800110.tar.gz external_llvm-470d5dc2410dd693a11a3c572fe1c5f40c800110.tar.bz2 | |
optimize fxor like for
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46345 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/Target/X86/X86ISelLowering.cpp | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp index cef8e4b..e4d4ceb 100644 --- a/lib/Target/X86/X86ISelLowering.cpp +++ b/lib/Target/X86/X86ISelLowering.cpp @@ -5627,10 +5627,12 @@ static SDOperand PerformSELECTCombine(SDNode *N, SelectionDAG &DAG, return SDOperand(); } -/// PerformFORCombine - Do target-specific dag combines on X86ISD::FOR nodes. +/// PerformFORCombine - Do target-specific dag combines on X86ISD::FOR and +/// X86ISD::FXOR nodes. static SDOperand PerformFORCombine(SDNode *N, SelectionDAG &DAG) { - // FOR(0.0, x) -> x - // FOR(x, 0.0) -> x + assert(N->getOpcode() == X86ISD::FOR || N->getOpcode() == X86ISD::FXOR); + // F[X]OR(0.0, x) -> x + // F[X]OR(x, 0.0) -> x if (ConstantFPSDNode *C = dyn_cast<ConstantFPSDNode>(N->getOperand(0))) if (C->getValueAPF().isPosZero()) return N->getOperand(1); @@ -5661,6 +5663,7 @@ SDOperand X86TargetLowering::PerformDAGCombine(SDNode *N, default: break; case ISD::VECTOR_SHUFFLE: return PerformShuffleCombine(N, DAG, Subtarget); case ISD::SELECT: return PerformSELECTCombine(N, DAG, Subtarget); + case X86ISD::FXOR: case X86ISD::FOR: return PerformFORCombine(N, DAG); case X86ISD::FAND: return PerformFANDCombine(N, DAG); } |