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PPC64 passes arguments of integral type in i64 registers, not i32. Reflect this

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by promoting smaller integral values (i32 at this point) to i64, then truncating
to get the wanted size.

llvm-svn: 48030
This commit is contained in:
Bill Wendling 2008-03-07 20:49:02 +00:00
parent 5bf464e1e6
commit 948c50e2be
1 changed files with 43 additions and 26 deletions
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69
lib/Target/PowerPC/PPCISelLowering.cpp
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@ -1296,13 +1296,14 @@ static const unsigned *GetFPR(const PPCSubtarget &Subtarget) {
return FPR;
}
SDOperand PPCTargetLowering::LowerFORMAL_ARGUMENTS(SDOperand Op,
SelectionDAG &DAG,
int &VarArgsFrameIndex,
int &VarArgsStackOffset,
unsigned &VarArgsNumGPR,
unsigned &VarArgsNumFPR,
const PPCSubtarget &Subtarget) {
SDOperand
PPCTargetLowering::LowerFORMAL_ARGUMENTS(SDOperand Op,
SelectionDAG &DAG,
int &VarArgsFrameIndex,
int &VarArgsStackOffset,
unsigned &VarArgsNumGPR,
unsigned &VarArgsNumFPR,
const PPCSubtarget &Subtarget) {
// TODO: add description of PPC stack frame format, or at least some docs.
//
MachineFunction &MF = DAG.getMachineFunction();
@ -1408,29 +1409,46 @@ SDOperand PPCTargetLowering::LowerFORMAL_ARGUMENTS(SDOperand Op,
switch (ObjectVT) {
default: assert(0 && "Unhandled argument type!");
case MVT::i32:
// Double word align in ELF
if (Expand && isELF32_ABI) GPR_idx += (GPR_idx % 2);
if (GPR_idx != Num_GPR_Regs) {
unsigned VReg = RegInfo.createVirtualRegister(&PPC::GPRCRegClass);
RegInfo.addLiveIn(GPR[GPR_idx], VReg);
ArgVal = DAG.getCopyFromReg(Root, VReg, MVT::i32);
++GPR_idx;
} else {
needsLoad = true;
ArgSize = PtrByteSize;
if (!isPPC64) {
// Double word align in ELF
if (Expand && isELF32_ABI) GPR_idx += (GPR_idx % 2);
if (GPR_idx != Num_GPR_Regs) {
unsigned VReg = RegInfo.createVirtualRegister(&PPC::GPRCRegClass);
RegInfo.addLiveIn(GPR[GPR_idx], VReg);
ArgVal = DAG.getCopyFromReg(Root, VReg, MVT::i32);
++GPR_idx;
} else {
needsLoad = true;
ArgSize = PtrByteSize;
}
// Stack align in ELF
if (needsLoad && Expand && isELF32_ABI)
ArgOffset += ((ArgOffset/4) % 2) * PtrByteSize;
// All int arguments reserve stack space in Macho ABI.
if (isMachoABI || needsLoad) ArgOffset += PtrByteSize;
break;
}
// Stack align in ELF
if (needsLoad && Expand && isELF32_ABI)
ArgOffset += ((ArgOffset/4) % 2) * PtrByteSize;
// All int arguments reserve stack space in Macho ABI.
if (isMachoABI || needsLoad) ArgOffset += PtrByteSize;
break;
// FALLTHROUGH
case MVT::i64: // PPC64
if (GPR_idx != Num_GPR_Regs) {
unsigned VReg = RegInfo.createVirtualRegister(&PPC::G8RCRegClass);
RegInfo.addLiveIn(GPR[GPR_idx], VReg);
ArgVal = DAG.getCopyFromReg(Root, VReg, MVT::i64);
if (ObjectVT == MVT::i32) {
// PPC64 passes i8, i16, and i32 values in i64 registers. Promote
// value to MVT::i64 and then truncate to the correct register size.
if (Flags & ISD::ParamFlags::SExt)
ArgVal = DAG.getNode(ISD::AssertSext, MVT::i64, ArgVal,
DAG.getValueType(ObjectVT));
else if (Flags & ISD::ParamFlags::ZExt)
ArgVal = DAG.getNode(ISD::AssertZext, MVT::i64, ArgVal,
DAG.getValueType(ObjectVT));
ArgVal = DAG.getNode(ISD::TRUNCATE, MVT::i32, ArgVal);
}
++GPR_idx;
} else {
needsLoad = true;
@ -1620,7 +1638,7 @@ static SDNode *isBLACompatibleAddress(SDOperand Op, SelectionDAG &DAG) {
/// does not fit in registers.
static SDOperand
CreateCopyOfByValArgument(SDOperand Src, SDOperand Dst, SDOperand Chain,
unsigned Flags, SelectionDAG &DAG, unsigned Size) {
unsigned Flags, SelectionDAG &DAG, unsigned Size) {
unsigned Align = 1 <<
((Flags & ISD::ParamFlags::ByValAlign) >> ISD::ParamFlags::ByValAlignOffs);
SDOperand AlignNode = DAG.getConstant(Align, MVT::i32);
@ -1742,7 +1760,6 @@ SDOperand PPCTargetLowering::LowerCALL(SDOperand Op, SelectionDAG &DAG,
// On PPC64, promote integers to 64-bit values.
if (isPPC64 && Arg.getValueType() == MVT::i32) {
unsigned ExtOp = (Flags & 1) ? ISD::SIGN_EXTEND : ISD::ZERO_EXTEND;
Arg = DAG.getNode(ExtOp, MVT::i64, Arg);
}