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Vector args passed in registers don't reserve stack space. 

llvm-svn: 28333
This commit is contained in:
Chris Lattner 2006-05-16 18:51:52 +00:00
parent f4d08dd0d3
commit 318f0d2122
1 changed files with 26 additions and 11 deletions
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37
llvm/lib/Target/PowerPC/PPCISelLowering.cpp
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@ -765,20 +765,43 @@ static SDOperand LowerFORMAL_ARGUMENTS(SDOperand Op, SelectionDAG &DAG,
MVT::ValueType ObjectVT = Op.getValue(ArgNo).getValueType();
unsigned ObjSize = MVT::getSizeInBits(ObjectVT)/8;
unsigned CurArgOffset = ArgOffset;
switch (ObjectVT) {
default: assert(0 && "Unhandled argument type!");
case MVT::i32:
if (!ArgLive) break;
// All int arguments reserve stack space.
ArgOffset += 4;
if (!ArgLive) {
if (GPR_remaining > 0) {
--GPR_remaining;
++GPR_idx;
}
break;
}
if (GPR_remaining > 0) {
unsigned VReg = RegMap->createVirtualRegister(&PPC::GPRCRegClass);
MF.addLiveIn(GPR[GPR_idx], VReg);
ArgVal = DAG.getCopyFromReg(Root, VReg, MVT::i32);
--GPR_remaining;
++GPR_idx;
} else {
needsLoad = true;
}
break;
case MVT::f32:
case MVT::f64:
// All FP arguments reserve stack space.
ArgOffset += ObjSize;
// Every 4 bytes of argument space consumes one of the GPRs available for
// argument passing.
if (GPR_remaining > 0) {
unsigned delta = (GPR_remaining > 1 && ObjSize == 8) ? 2 : 1;
GPR_remaining -= delta;
GPR_idx += delta;
}
if (!ArgLive) {
if (FPR_remaining > 0) {
--FPR_remaining;
@ -804,6 +827,7 @@ static SDOperand LowerFORMAL_ARGUMENTS(SDOperand Op, SelectionDAG &DAG,
case MVT::v4i32:
case MVT::v8i16:
case MVT::v16i8:
// Note that vector arguments in registers don't reserve stack space.
if (!ArgLive) {
if (VR_remaining > 0) {
--VR_remaining;
@ -829,21 +853,12 @@ static SDOperand LowerFORMAL_ARGUMENTS(SDOperand Op, SelectionDAG &DAG,
// We need to load the argument to a virtual register if we determined above
// that we ran out of physical registers of the appropriate type
if (needsLoad) {
int FI = MFI->CreateFixedObject(ObjSize, ArgOffset);
int FI = MFI->CreateFixedObject(ObjSize, CurArgOffset);
SDOperand FIN = DAG.getFrameIndex(FI, MVT::i32);
ArgVal = DAG.getLoad(ObjectVT, Root, FIN,
DAG.getSrcValue(NULL));
}
// Every 4 bytes of argument space consumes one of the GPRs available for
// argument passing.
if (GPR_remaining > 0) {
unsigned delta = (GPR_remaining > 1 && ObjSize == 8) ? 2 : 1;
GPR_remaining -= delta;
GPR_idx += delta;
}
ArgOffset += ObjSize;
if (ArgVal.Val == 0)
ArgVal = DAG.getNode(ISD::UNDEF, ObjectVT);
ArgValues.push_back(ArgVal);