Mark physregs defined by inline asm as implicit.
This is a bit of a hack to make inline asm look more like call instructions.
It would be better to produce correct dead flags during isel.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@105749 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/SelectionDAG/InstrEmitter.cpp b/lib/CodeGen/SelectionDAG/InstrEmitter.cpp
index 1febdb5..1c53dbd 100644
--- a/lib/CodeGen/SelectionDAG/InstrEmitter.cpp
+++ b/lib/CodeGen/SelectionDAG/InstrEmitter.cpp
@@ -821,14 +821,18 @@
case InlineAsm::Kind_RegDef:
for (; NumVals; --NumVals, ++i) {
unsigned Reg = cast<RegisterSDNode>(Node->getOperand(i))->getReg();
- MI->addOperand(MachineOperand::CreateReg(Reg, true));
+ // FIXME: Add dead flags for physical and virtual registers defined.
+ // For now, mark physical register defs as implicit to help fast
+ // regalloc. This makes inline asm look a lot like calls.
+ MI->addOperand(MachineOperand::CreateReg(Reg, true,
+ /*isImp=*/ TargetRegisterInfo::isPhysicalRegister(Reg)));
}
break;
case InlineAsm::Kind_RegDefEarlyClobber:
for (; NumVals; --NumVals, ++i) {
unsigned Reg = cast<RegisterSDNode>(Node->getOperand(i))->getReg();
MI->addOperand(MachineOperand::CreateReg(Reg, /*isDef=*/ true,
- /*isImp=*/ false,
+ /*isImp=*/ TargetRegisterInfo::isPhysicalRegister(Reg),
/*isKill=*/ false,
/*isDead=*/ false,
/*isUndef=*/false,