diff options
| author | Evan Cheng <evan.cheng@apple.com> | 2006-06-02 21:20:34 +0000 |
|---|---|---|
| committer | Evan Cheng <evan.cheng@apple.com> | 2006-06-02 21:20:34 +0000 |
| commit | aede9b9598a49da48478c889a8f4412a8b32bcf4 (patch) | |
| tree | ae57ad59886150cd75c292a5e67416fca91d7e39 | |
| parent | 94b1453278f0e136e5bca62fb631953f434af254 (diff) | |
Use xor to clear a register.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28667 91177308-0d34-0410-b5e6-96231b3b80d8
| -rw-r--r-- | lib/Target/X86/X86ISelDAGToDAG.cpp | 10 |
1 files changed, 4 insertions, 6 deletions
diff --git a/lib/Target/X86/X86ISelDAGToDAG.cpp b/lib/Target/X86/X86ISelDAGToDAG.cpp index 3afee990b9..e8da9d7912 100644 --- a/lib/Target/X86/X86ISelDAGToDAG.cpp +++ b/lib/Target/X86/X86ISelDAGToDAG.cpp @@ -744,17 +744,17 @@ void X86DAGToDAGISel::Select(SDOperand &Result, SDOperand N) { default: assert(0 && "Unsupported VT!"); case MVT::i8: LoReg = X86::AL; HiReg = X86::AH; - ClrOpcode = X86::MOV8ri; + ClrOpcode = X86::MOV8r0; SExtOpcode = X86::CBW; break; case MVT::i16: LoReg = X86::AX; HiReg = X86::DX; - ClrOpcode = X86::MOV16ri; + ClrOpcode = X86::MOV16r0; SExtOpcode = X86::CWD; break; case MVT::i32: LoReg = X86::EAX; HiReg = X86::EDX; - ClrOpcode = X86::MOV32ri; + ClrOpcode = X86::MOV32r0; SExtOpcode = X86::CDQ; break; } @@ -783,9 +783,7 @@ void X86DAGToDAGISel::Select(SDOperand &Result, SDOperand N) { SDOperand(CurDAG->getTargetNode(SExtOpcode, MVT::Flag, InFlag), 0); } else { // Zero out the high part, effectively zero extending the input. - SDOperand ClrNode = - SDOperand(CurDAG->getTargetNode(ClrOpcode, NVT, - CurDAG->getTargetConstant(0, NVT)), 0); + SDOperand ClrNode = SDOperand(CurDAG->getTargetNode(ClrOpcode, NVT), 0); Chain = CurDAG->getCopyToReg(Chain, CurDAG->getRegister(HiReg, NVT), ClrNode, InFlag); InFlag = Chain.getValue(1); |