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Implement Mips64's handling of byval arguments in LowerCall.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@144452 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Akira Hatanaka 2011-11-12 02:34:50 +00:00
parent afe153c53f
commit 6df3e7b162
1 changed files with 100 additions and 12 deletions
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112
lib/Target/Mips/MipsISelLowering.cpp
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@ -2026,6 +2026,90 @@ WriteByValArg(SDValue& ByValChain, SDValue Chain, DebugLoc dl,
MachinePointerInfo(0), MachinePointerInfo(0));
}
// Copy Mips64 byVal arg to registers and stack.
void static
PassByValArg64(SDValue& ByValChain, SDValue Chain, DebugLoc dl,
SmallVector<std::pair<unsigned, SDValue>, 16>& RegsToPass,
SmallVector<SDValue, 8>& MemOpChains, int& LastFI,
MachineFrameInfo *MFI, SelectionDAG &DAG, SDValue Arg,
const CCValAssign &VA, const ISD::ArgFlagsTy& Flags,
EVT PtrTy, bool isLittle) {
unsigned ByValSize = Flags.getByValSize();
unsigned Alignment = std::min(Flags.getByValAlign(), (unsigned)8);
bool IsRegLoc = VA.isRegLoc();
unsigned Offset = 0; // Offset in # of bytes from the beginning of struct.
unsigned LocMemOffset = 0;
if (!IsRegLoc)
LocMemOffset = VA.getLocMemOffset();
else {
const unsigned *Reg = std::find(Mips64IntRegs, Mips64IntRegs + 8,
VA.getLocReg());
const unsigned *RegEnd = Mips64IntRegs + 8;
// Copy double words to registers.
for (; (Reg != RegEnd) && (ByValSize >= Offset + 8); ++Reg, Offset += 8) {
SDValue LoadPtr = DAG.getNode(ISD::ADD, dl, PtrTy, Arg,
DAG.getConstant(Offset, PtrTy));
SDValue LoadVal = DAG.getLoad(MVT::i64, dl, Chain, LoadPtr,
MachinePointerInfo(), false, false, false,
Alignment);
MemOpChains.push_back(LoadVal.getValue(1));
RegsToPass.push_back(std::make_pair(*Reg, LoadVal));
}
// If there is an argument register available, copy the remainder of the
// byval argument with sub-doubleword loads and shifts.
if ((Reg != RegEnd) && (ByValSize != Offset)) {
assert((ByValSize < Offset + 8) &&
"Size of the remainder should be smaller than 8-byte.");
SDValue Val;
for (unsigned LoadSize = 4; Offset < ByValSize; LoadSize /= 2) {
unsigned RemSize = ByValSize - Offset;
if (RemSize < LoadSize)
continue;
SDValue LoadPtr = DAG.getNode(ISD::ADD, dl, PtrTy, Arg,
DAG.getConstant(Offset, PtrTy));
SDValue LoadVal =
DAG.getExtLoad(ISD::ZEXTLOAD, dl, MVT::i64, Chain, LoadPtr,
MachinePointerInfo(), MVT::getIntegerVT(LoadSize * 8),
false, false, Alignment);
MemOpChains.push_back(LoadVal.getValue(1));
// Offset in number of bits from double word boundary.
unsigned OffsetDW = (Offset % 8) * 8;
unsigned Shamt = isLittle ? OffsetDW : 64 - (OffsetDW + LoadSize * 8);
SDValue Shift = DAG.getNode(ISD::SHL, dl, MVT::i64, LoadVal,
DAG.getConstant(Shamt, MVT::i32));
Val = Val.getNode() ? DAG.getNode(ISD::OR, dl, MVT::i64, Val, Shift) :
Shift;
Offset += LoadSize;
Alignment = std::min(Alignment, LoadSize);
}
RegsToPass.push_back(std::make_pair(*Reg, Val));
return;
}
}
unsigned MemCpySize = ByValSize - Offset;
if (MemCpySize) {
// Create a fixed object on stack at offset LocMemOffset and copy
// remainder of byval arg to it with memcpy.
SDValue Src = DAG.getNode(ISD::ADD, dl, PtrTy, Arg,
DAG.getConstant(Offset, PtrTy));
LastFI = MFI->CreateFixedObject(MemCpySize, LocMemOffset, true);
SDValue Dst = DAG.getFrameIndex(LastFI, PtrTy);
ByValChain = DAG.getMemcpy(ByValChain, dl, Dst, Src,
DAG.getConstant(MemCpySize, PtrTy), Alignment,
/*isVolatile=*/false, /*AlwaysInline=*/false,
MachinePointerInfo(0), MachinePointerInfo(0));
}
}
/// LowerCall - functions arguments are copied from virtual regs to
/// (physical regs)/(stack frame), CALLSEQ_START and CALLSEQ_END are emitted.
/// TODO: isTailCall.
@ -2112,6 +2196,22 @@ MipsTargetLowering::LowerCall(SDValue InChain, SDValue Callee,
SDValue Arg = OutVals[i];
CCValAssign &VA = ArgLocs[i];
MVT ValVT = VA.getValVT(), LocVT = VA.getLocVT();
ISD::ArgFlagsTy Flags = Outs[i].Flags;
// ByVal Arg.
if (Flags.isByVal()) {
assert(Flags.getByValSize() &&
"ByVal args of size 0 should have been ignored by front-end.");
if (IsO32)
WriteByValArg(ByValChain, Chain, dl, RegsToPass, MemOpChains, LastFI,
MFI, DAG, Arg, VA, Flags, getPointerTy(),
Subtarget->isLittle());
else
PassByValArg64(ByValChain, Chain, dl, RegsToPass, MemOpChains, LastFI,
MFI, DAG, Arg, VA, Flags, getPointerTy(),
Subtarget->isLittle());
continue;
}
// Promote the value if needed.
switch (VA.getLocInfo()) {
@ -2157,18 +2257,6 @@ MipsTargetLowering::LowerCall(SDValue InChain, SDValue Callee,
// Register can't get to this point...
assert(VA.isMemLoc());
// ByVal Arg.
ISD::ArgFlagsTy Flags = Outs[i].Flags;
if (Flags.isByVal()) {
assert(IsO32 &&
"No support for ByVal args by ABIs other than O32 yet.");
assert(Flags.getByValSize() &&
"ByVal args of size 0 should have been ignored by front-end.");
WriteByValArg(ByValChain, Chain, dl, RegsToPass, MemOpChains, LastFI, MFI,
DAG, Arg, VA, Flags, getPointerTy(), Subtarget->isLittle());
continue;
}
// Create the frame index object for this incoming parameter
LastFI = MFI->CreateFixedObject(ValVT.getSizeInBits()/8,
VA.getLocMemOffset(), true);