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https://github.com/c64scene-ar/llvm-6502.git
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In thumb mode, round up stack frame size to multiple of 4 since add/sub
sp, imm instructions implicitly multiply the offset by 4. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@33653 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng
parent
5b91c7f69a
commit
236f677e48
@ -884,93 +884,100 @@ void ARMRegisterInfo::emitPrologue(MachineFunction &MF) const {
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unsigned NumBytes = MFI->getStackSize();
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const std::vector<CalleeSavedInfo> &CSI = MFI->getCalleeSavedInfo();
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if (isThumb) {
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// Thumb add/sub sp, imm8 instructions implicitly multiply the offset by 4.
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NumBytes = (NumBytes + 3) & ~3;
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MFI->setStackSize(NumBytes);
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}
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// Determine the sizes of each callee-save spill areas and record which frame
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// belongs to which callee-save spill areas.
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unsigned GPRCS1Size = 0, GPRCS2Size = 0, DPRCSSize = 0;
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int FramePtrSpillFI = 0;
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if (AFI->hasStackFrame()) {
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if (VARegSaveSize)
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emitSPUpdate(MBB, MBBI, -VARegSaveSize, isThumb, TII);
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if (!AFI->hasStackFrame()) {
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if (NumBytes != 0)
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emitSPUpdate(MBB, MBBI, -NumBytes, isThumb, TII);
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return;
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}
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for (unsigned i = 0, e = CSI.size(); i != e; ++i) {
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unsigned Reg = CSI[i].getReg();
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int FI = CSI[i].getFrameIdx();
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switch (Reg) {
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case ARM::R4:
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case ARM::R5:
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case ARM::R6:
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case ARM::R7:
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case ARM::LR:
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if (Reg == FramePtr)
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FramePtrSpillFI = FI;
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if (VARegSaveSize)
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emitSPUpdate(MBB, MBBI, -VARegSaveSize, isThumb, TII);
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for (unsigned i = 0, e = CSI.size(); i != e; ++i) {
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unsigned Reg = CSI[i].getReg();
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int FI = CSI[i].getFrameIdx();
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switch (Reg) {
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case ARM::R4:
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case ARM::R5:
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case ARM::R6:
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case ARM::R7:
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case ARM::LR:
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if (Reg == FramePtr)
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FramePtrSpillFI = FI;
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AFI->addGPRCalleeSavedArea1Frame(FI);
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GPRCS1Size += 4;
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break;
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case ARM::R8:
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case ARM::R9:
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case ARM::R10:
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case ARM::R11:
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if (Reg == FramePtr)
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FramePtrSpillFI = FI;
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if (STI.isTargetDarwin()) {
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AFI->addGPRCalleeSavedArea2Frame(FI);
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GPRCS2Size += 4;
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} else {
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AFI->addGPRCalleeSavedArea1Frame(FI);
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GPRCS1Size += 4;
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break;
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case ARM::R8:
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case ARM::R9:
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case ARM::R10:
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case ARM::R11:
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if (Reg == FramePtr)
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FramePtrSpillFI = FI;
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if (STI.isTargetDarwin()) {
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AFI->addGPRCalleeSavedArea2Frame(FI);
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GPRCS2Size += 4;
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} else {
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AFI->addGPRCalleeSavedArea1Frame(FI);
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GPRCS1Size += 4;
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}
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break;
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default:
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AFI->addDPRCalleeSavedAreaFrame(FI);
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DPRCSSize += 8;
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}
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}
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if (Align == 8 && (GPRCS1Size & 7) != 0)
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// Pad CS1 to ensure proper alignment.
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GPRCS1Size += 4;
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if (!isThumb) {
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// Build the new SUBri to adjust SP for integer callee-save spill area 1.
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emitSPUpdate(MBB, MBBI, -GPRCS1Size, isThumb, TII);
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movePastCSLoadStoreOps(MBB, MBBI, ARM::STR, 1, STI);
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} else if (MBBI != MBB.end() && MBBI->getOpcode() == ARM::tPUSH)
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++MBBI;
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// Point FP to the stack slot that contains the previous FP.
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if (STI.isTargetDarwin())
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BuildMI(MBB, MBBI, TII.get(isThumb ? ARM::tADDrSPi : ARM::ADDri), FramePtr)
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.addFrameIndex(FramePtrSpillFI).addImm(0);
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if (!isThumb) {
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// Build the new SUBri to adjust SP for integer callee-save spill area 2.
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emitSPUpdate(MBB, MBBI, -GPRCS2Size, false, TII);
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// Build the new SUBri to adjust SP for FP callee-save spill area.
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movePastCSLoadStoreOps(MBB, MBBI, ARM::STR, 2, STI);
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emitSPUpdate(MBB, MBBI, -DPRCSSize, false, TII);
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break;
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default:
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AFI->addDPRCalleeSavedAreaFrame(FI);
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DPRCSSize += 8;
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}
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}
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if (Align == 8 && (GPRCS1Size & 7) != 0)
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// Pad CS1 to ensure proper alignment.
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GPRCS1Size += 4;
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if (!isThumb) {
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// Build the new SUBri to adjust SP for integer callee-save spill area 1.
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emitSPUpdate(MBB, MBBI, -GPRCS1Size, isThumb, TII);
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movePastCSLoadStoreOps(MBB, MBBI, ARM::STR, 1, STI);
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} else if (MBBI != MBB.end() && MBBI->getOpcode() == ARM::tPUSH)
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++MBBI;
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// Point FP to the stack slot that contains the previous FP.
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if (STI.isTargetDarwin())
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BuildMI(MBB, MBBI, TII.get(isThumb ? ARM::tADDrSPi : ARM::ADDri), FramePtr)
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.addFrameIndex(FramePtrSpillFI).addImm(0);
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if (!isThumb) {
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// Build the new SUBri to adjust SP for integer callee-save spill area 2.
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emitSPUpdate(MBB, MBBI, -GPRCS2Size, false, TII);
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// Build the new SUBri to adjust SP for FP callee-save spill area.
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movePastCSLoadStoreOps(MBB, MBBI, ARM::STR, 2, STI);
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emitSPUpdate(MBB, MBBI, -DPRCSSize, false, TII);
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}
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// Determine starting offsets of spill areas.
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if (AFI->hasStackFrame()) {
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unsigned DPRCSOffset = NumBytes - (GPRCS1Size + GPRCS2Size + DPRCSSize);
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unsigned GPRCS2Offset = DPRCSOffset + DPRCSSize;
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unsigned GPRCS1Offset = GPRCS2Offset + GPRCS2Size;
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AFI->setFramePtrSpillOffset(MFI->getObjectOffset(FramePtrSpillFI) + NumBytes);
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AFI->setGPRCalleeSavedArea1Offset(GPRCS1Offset);
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AFI->setGPRCalleeSavedArea2Offset(GPRCS2Offset);
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AFI->setDPRCalleeSavedAreaOffset(DPRCSOffset);
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unsigned DPRCSOffset = NumBytes - (GPRCS1Size + GPRCS2Size + DPRCSSize);
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unsigned GPRCS2Offset = DPRCSOffset + DPRCSSize;
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unsigned GPRCS1Offset = GPRCS2Offset + GPRCS2Size;
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AFI->setFramePtrSpillOffset(MFI->getObjectOffset(FramePtrSpillFI) + NumBytes);
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AFI->setGPRCalleeSavedArea1Offset(GPRCS1Offset);
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AFI->setGPRCalleeSavedArea2Offset(GPRCS2Offset);
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AFI->setDPRCalleeSavedAreaOffset(DPRCSOffset);
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NumBytes = DPRCSOffset;
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if (NumBytes) {
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// Insert it after all the callee-save spills.
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if (!isThumb)
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movePastCSLoadStoreOps(MBB, MBBI, ARM::FSTD, 3, STI);
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emitSPUpdate(MBB, MBBI, -NumBytes, isThumb, TII);
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}
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} else
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NumBytes = DPRCSOffset;
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if (NumBytes) {
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// Insert it after all the callee-save spills.
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if (!isThumb)
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movePastCSLoadStoreOps(MBB, MBBI, ARM::FSTD, 3, STI);
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emitSPUpdate(MBB, MBBI, -NumBytes, isThumb, TII);
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}
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AFI->setGPRCalleeSavedArea1Size(GPRCS1Size);
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AFI->setGPRCalleeSavedArea2Size(GPRCS2Size);
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@ -1005,58 +1012,60 @@ void ARMRegisterInfo::emitEpilogue(MachineFunction &MF,
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bool isThumb = AFI->isThumbFunction();
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unsigned VARegSaveSize = AFI->getVarArgsRegSaveSize();
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int NumBytes = (int)MFI->getStackSize();
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if (AFI->hasStackFrame()) {
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// Unwind MBBI to point to first LDR / FLDD.
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const unsigned *CSRegs = getCalleeSavedRegs();
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if (MBBI != MBB.begin()) {
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do
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--MBBI;
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while (MBBI != MBB.begin() && isCSRestore(MBBI, CSRegs));
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if (!isCSRestore(MBBI, CSRegs))
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++MBBI;
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}
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// Move SP to start of FP callee save spill area.
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NumBytes -= (AFI->getGPRCalleeSavedArea1Size() +
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AFI->getGPRCalleeSavedArea2Size() +
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AFI->getDPRCalleeSavedAreaSize());
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if (isThumb)
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if (!AFI->hasStackFrame()) {
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if (NumBytes != 0)
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emitSPUpdate(MBB, MBBI, NumBytes, isThumb, TII);
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else {
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if (STI.isTargetDarwin()) {
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NumBytes = AFI->getFramePtrSpillOffset() - NumBytes;
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// Reset SP based on frame pointer only if the stack frame extends beyond
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// frame pointer stack slot.
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if (AFI->getGPRCalleeSavedArea2Size() ||
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AFI->getDPRCalleeSavedAreaSize() ||
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AFI->getDPRCalleeSavedAreaOffset())
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if (NumBytes)
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BuildMI(MBB, MBBI, TII.get(ARM::SUBri), ARM::SP).addReg(FramePtr)
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.addImm(NumBytes);
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else
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BuildMI(MBB, MBBI, TII.get(ARM::MOVrr), ARM::SP).addReg(FramePtr);
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} else if (NumBytes) {
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emitSPUpdate(MBB, MBBI, NumBytes, false, TII);
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}
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return;
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}
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// Move SP to start of integer callee save spill area 2.
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movePastCSLoadStoreOps(MBB, MBBI, ARM::FLDD, 3, STI);
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emitSPUpdate(MBB, MBBI, AFI->getDPRCalleeSavedAreaSize(), false, TII);
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// Unwind MBBI to point to first LDR / FLDD.
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const unsigned *CSRegs = getCalleeSavedRegs();
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if (MBBI != MBB.begin()) {
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do
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--MBBI;
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while (MBBI != MBB.begin() && isCSRestore(MBBI, CSRegs));
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if (!isCSRestore(MBBI, CSRegs))
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++MBBI;
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}
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// Move SP to start of integer callee save spill area 1.
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movePastCSLoadStoreOps(MBB, MBBI, ARM::LDR, 2, STI);
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emitSPUpdate(MBB, MBBI, AFI->getGPRCalleeSavedArea2Size(), false, TII);
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// Move SP to SP upon entry to the function.
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movePastCSLoadStoreOps(MBB, MBBI, ARM::LDR, 1, STI);
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emitSPUpdate(MBB, MBBI, AFI->getGPRCalleeSavedArea1Size(), false, TII);
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// Move SP to start of FP callee save spill area.
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NumBytes -= (AFI->getGPRCalleeSavedArea1Size() +
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AFI->getGPRCalleeSavedArea2Size() +
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AFI->getDPRCalleeSavedAreaSize());
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if (isThumb)
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emitSPUpdate(MBB, MBBI, NumBytes, isThumb, TII);
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else {
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if (STI.isTargetDarwin()) {
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NumBytes = AFI->getFramePtrSpillOffset() - NumBytes;
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// Reset SP based on frame pointer only if the stack frame extends beyond
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// frame pointer stack slot.
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if (AFI->getGPRCalleeSavedArea2Size() ||
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AFI->getDPRCalleeSavedAreaSize() ||
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AFI->getDPRCalleeSavedAreaOffset())
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if (NumBytes)
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BuildMI(MBB, MBBI, TII.get(ARM::SUBri), ARM::SP).addReg(FramePtr)
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.addImm(NumBytes);
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else
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BuildMI(MBB, MBBI, TII.get(ARM::MOVrr), ARM::SP).addReg(FramePtr);
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} else if (NumBytes) {
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emitSPUpdate(MBB, MBBI, NumBytes, false, TII);
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}
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if (VARegSaveSize)
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emitSPUpdate(MBB, MBBI, VARegSaveSize, isThumb, TII);
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} else if (NumBytes != 0) {
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emitSPUpdate(MBB, MBBI, NumBytes, isThumb, TII);
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// Move SP to start of integer callee save spill area 2.
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movePastCSLoadStoreOps(MBB, MBBI, ARM::FLDD, 3, STI);
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emitSPUpdate(MBB, MBBI, AFI->getDPRCalleeSavedAreaSize(), false, TII);
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// Move SP to start of integer callee save spill area 1.
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movePastCSLoadStoreOps(MBB, MBBI, ARM::LDR, 2, STI);
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emitSPUpdate(MBB, MBBI, AFI->getGPRCalleeSavedArea2Size(), false, TII);
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// Move SP to SP upon entry to the function.
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movePastCSLoadStoreOps(MBB, MBBI, ARM::LDR, 1, STI);
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emitSPUpdate(MBB, MBBI, AFI->getGPRCalleeSavedArea1Size(), false, TII);
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}
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if (VARegSaveSize)
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emitSPUpdate(MBB, MBBI, VARegSaveSize, isThumb, TII);
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}
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unsigned ARMRegisterInfo::getRARegister() const {
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