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Use live out sets for return values instead of imp_defs, which is cleaner and faster.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21181 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2005-04-09 15:23:56 +00:00
parent d493b34d31
commit 4c52f0ec8c
2 changed files with 41 additions and 14 deletions
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26
lib/Target/X86/X86ISelPattern.cpp
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@@ -160,6 +160,26 @@ X86TargetLowering::LowerArguments(Function &F, SelectionDAG &DAG) {
if (F.isVarArg())
VarArgsFrameIndex = MFI->CreateFixedObject(1, ArgOffset);
ReturnAddrIndex = 0; // No return address slot generated yet.
// Finally, inform the code generator which regs we return values in.
switch (getValueType(F.getReturnType())) {
default: assert(0 && "Unknown type!");
case MVT::isVoid: break;
case MVT::i1:
case MVT::i8:
case MVT::i16:
case MVT::i32:
MF.addLiveOut(X86::EAX);
break;
case MVT::i64:
MF.addLiveOut(X86::EAX);
MF.addLiveOut(X86::EDX);
break;
case MVT::f32:
case MVT::f64:
MF.addLiveOut(X86::ST0);
break;
}
return ArgValues;
}
@@ -2929,9 +2949,6 @@ void ISel::Select(SDOperand N) {
BuildMI(BB, X86::MOV32rr, 1, X86::EAX).addReg(Tmp1);
BuildMI(BB, X86::MOV32rr, 1, X86::EDX).addReg(Tmp2);
// Declare that EAX & EDX are live on exit.
BuildMI(BB, X86::IMPLICIT_USE, 3).addReg(X86::EAX).addReg(X86::EDX)
.addReg(X86::ESP);
break;
case 2:
if (getRegPressure(N.getOperand(0)) > getRegPressure(N.getOperand(1))) {
@@ -2945,12 +2962,9 @@ void ISel::Select(SDOperand N) {
default: assert(0 && "All other types should have been promoted!!");
case MVT::f64:
BuildMI(BB, X86::FpSETRESULT, 1).addReg(Tmp1);
// Declare that top-of-stack is live on exit
BuildMI(BB, X86::IMPLICIT_USE, 2).addReg(X86::ST0).addReg(X86::ESP);
break;
case MVT::i32:
BuildMI(BB, X86::MOV32rr, 1, X86::EAX).addReg(Tmp1);
BuildMI(BB, X86::IMPLICIT_USE, 2).addReg(X86::EAX).addReg(X86::ESP);
break;
}
break;