Use xor to clear a register.
llvm-svn: 28667
diff --git a/llvm/lib/Target/X86/X86ISelDAGToDAG.cpp b/llvm/lib/Target/X86/X86ISelDAGToDAG.cpp
index 3afee99..e8da9d7 100644
--- a/llvm/lib/Target/X86/X86ISelDAGToDAG.cpp
+++ b/llvm/lib/Target/X86/X86ISelDAGToDAG.cpp
@@ -744,17 +744,17 @@
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 @@
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);