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Simplify function PassByValArg64.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@144664 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Akira Hatanaka 2011-11-15 18:42:25 +00:00
parent 00e1fa499d
commit 160408546c
1 changed files with 18 additions and 14 deletions
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32
lib/Target/Mips/MipsISelLowering.cpp
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@ -2063,6 +2063,7 @@ PassByValArg64(SDValue& ByValChain, SDValue Chain, DebugLoc dl,
bool IsRegLoc = VA.isRegLoc();
unsigned Offset = 0; // Offset in # of bytes from the beginning of struct.
unsigned LocMemOffset = 0;
unsigned MemCpySize = ByValSize;
if (!IsRegLoc)
LocMemOffset = VA.getLocMemOffset();
@ -2082,9 +2083,13 @@ PassByValArg64(SDValue& ByValChain, SDValue Chain, DebugLoc dl,
RegsToPass.push_back(std::make_pair(*Reg, LoadVal));
}
// Return if the struct has been fully copied.
if (!(MemCpySize = ByValSize - Offset))
return;
// 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)) {
if (Reg != RegEnd) {
assert((ByValSize < Offset + 8) &&
"Size of the remainder should be smaller than 8-byte.");
SDValue Val;
@ -2119,19 +2124,18 @@ PassByValArg64(SDValue& ByValChain, SDValue Chain, DebugLoc dl,
}
}
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));
}
assert(MemCpySize && "MemCpySize must not be zero.");
// 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