Added truncate.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@24760 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/X86/X86ISelDAGToDAG.cpp b/lib/Target/X86/X86ISelDAGToDAG.cpp
index 842341a..db87384 100644
--- a/lib/Target/X86/X86ISelDAGToDAG.cpp
+++ b/lib/Target/X86/X86ISelDAGToDAG.cpp
@@ -391,6 +391,34 @@
}
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: {
SDOperand Chain = Node->getOperand(0); // Token chain.
unsigned NumOps = Node->getNumOperands();