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Added truncate.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@24760 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2005-12-17 02:02:50 +00:00
parent 1aabc4ea15
commit 45f37bc527
1 changed files with 28 additions and 0 deletions
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28
lib/Target/X86/X86ISelDAGToDAG.cpp
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@ -391,6 +391,34 @@ SDOperand X86DAGToDAGISel::Select(SDOperand N) {
} }
break; break;
case ISD::TRUNCATE: {
unsigned Reg;
MVT::ValueType VT;
switch (Node->getOperand(0).getValueType()) {
default: assert(0 && "Unknown truncate!");
case MVT::i16: Reg = X86::AX; Opc = X86::MOV16rr; VT = MVT::i16; break;
case MVT::i32: Reg = X86::EAX; Opc = X86::MOV32rr; VT = MVT::i32; break;
}
SDOperand Tmp0 = Select(Node->getOperand(0));
SDOperand Tmp1 = CurDAG->getTargetNode(Opc, VT, Tmp0);
SDOperand InFlag = SDOperand(0,0);
SDOperand Result = CurDAG->getCopyToReg(CurDAG->getEntryNode(),
Reg, Tmp1, InFlag).getValue(1);
SDOperand Chain = Result.getValue(0);
InFlag = Result.getValue(1);
switch (NVT) {
default: assert(0 && "Unknown truncate!");
case MVT::i8: Reg = X86::AL; Opc = X86::MOV8rr; VT = MVT::i8; break;
case MVT::i16: Reg = X86::AX; Opc = X86::MOV16rr; VT = MVT::i16; break;
}
Result = CurDAG->getCopyFromReg(Chain,
Reg, VT, InFlag);
return CodeGenMap[N] = CurDAG->getTargetNode(Opc, VT, Result);
break;
}
case ISD::RET: { case ISD::RET: {
SDOperand Chain = Node->getOperand(0); // Token chain. SDOperand Chain = Node->getOperand(0); // Token chain.
unsigned NumOps = Node->getNumOperands(); unsigned NumOps = Node->getNumOperands();