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

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 8d2ead2e34
commit 968f32ce3d
1 changed files with 43 additions and 26 deletions
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69
llvm/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);
}