[llvm-commits] [llvm] r144552 - /llvm/trunk/lib/Target/Mips/MipsISelLowering.cpp
Akira Hatanaka
ahatanaka at mips.com
Mon Nov 14 11:01:09 PST 2011
Author: ahatanak
Date: Mon Nov 14 13:01:09 2011
New Revision: 144552
URL: http://llvm.org/viewvc/llvm-project?rev=144552&view=rev
Log:
Modify LowerFormalArguments to correctly handle vaarg arguments for Mips64.
Modified:
llvm/trunk/lib/Target/Mips/MipsISelLowering.cpp
Modified: llvm/trunk/lib/Target/Mips/MipsISelLowering.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/Mips/MipsISelLowering.cpp?rev=144552&r1=144551&r2=144552&view=diff
==============================================================================
--- llvm/trunk/lib/Target/Mips/MipsISelLowering.cpp (original)
+++ llvm/trunk/lib/Target/Mips/MipsISelLowering.cpp Mon Nov 14 13:01:09 2011
@@ -2621,24 +2621,40 @@
Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other, Copy, Chain);
}
- if (isVarArg && IsO32) {
+ if (isVarArg) {
+ unsigned NumOfRegs = IsO32 ? 4 : 8;
+ const unsigned *ArgRegs = IsO32 ? O32IntRegs : Mips64IntRegs;
+ unsigned Idx = CCInfo.getFirstUnallocated(ArgRegs, NumOfRegs);
+ int FirstRegSlotOffset = IsO32 ? 0 : -64 ; // offset of $a0's slot.
+ TargetRegisterClass *RC
+ = IsO32 ? Mips::CPURegsRegisterClass : Mips::CPU64RegsRegisterClass;
+ unsigned RegSize = RC->getSize();
+ int RegSlotOffset = FirstRegSlotOffset + Idx * RegSize;
+
+ // Offset of the first variable argument from stack pointer.
+ int FirstVaArgOffset;
+
+ if (IsO32 || (Idx == NumOfRegs)) {
+ FirstVaArgOffset =
+ (CCInfo.getNextStackOffset() + RegSize - 1) / RegSize * RegSize;
+ } else
+ FirstVaArgOffset = RegSlotOffset;
+
// Record the frame index of the first variable argument
// which is a value necessary to VASTART.
- unsigned NextStackOffset = CCInfo.getNextStackOffset();
- assert(NextStackOffset % 4 == 0 &&
- "NextStackOffset must be aligned to 4-byte boundaries.");
- LastFI = MFI->CreateFixedObject(4, NextStackOffset, true);
+ LastFI = MFI->CreateFixedObject(RegSize, FirstVaArgOffset, true);
MipsFI->setVarArgsFrameIndex(LastFI);
- // If NextStackOffset is smaller than o32's 16-byte reserved argument area,
- // copy the integer registers that have not been used for argument passing
- // to the caller's stack frame.
- for (; NextStackOffset < 16; NextStackOffset += 4) {
- TargetRegisterClass *RC = Mips::CPURegsRegisterClass;
- unsigned Idx = NextStackOffset / 4;
- unsigned Reg = AddLiveIn(DAG.getMachineFunction(), O32IntRegs[Idx], RC);
- SDValue ArgValue = DAG.getCopyFromReg(Chain, dl, Reg, MVT::i32);
- LastFI = MFI->CreateFixedObject(4, NextStackOffset, true);
+ // Copy the integer registers that have not been used for argument passing
+ // to the argument register save area. For O32, the save area is allocated
+ // in the caller's stack frame, while for N32/64, it is allocated in the
+ // callee's stack frame.
+ for (int StackOffset = RegSlotOffset;
+ Idx < NumOfRegs; ++Idx, StackOffset += RegSize) {
+ unsigned Reg = AddLiveIn(DAG.getMachineFunction(), ArgRegs[Idx], RC);
+ SDValue ArgValue = DAG.getCopyFromReg(Chain, dl, Reg,
+ MVT::getIntegerVT(RegSize * 8));
+ LastFI = MFI->CreateFixedObject(RegSize, StackOffset, true);
SDValue PtrOff = DAG.getFrameIndex(LastFI, getPointerTy());
OutChains.push_back(DAG.getStore(Chain, dl, ArgValue, PtrOff,
MachinePointerInfo(),
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