6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2025-02-09 13:33:17 +00:00
Code Issues Projects Releases Wiki Activity

Use the correct register to access stack frame objects.

Browse Source 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@131785 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Akira Hatanaka 2011-05-21 03:01:03 +00:00
parent f346c69530
commit 52106e1e25
1 changed files with 31 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

41
lib/Target/Mips/MipsRegisterInfo.cpp
View File

@ -161,6 +161,8 @@ eliminateFrameIndex(MachineBasicBlock::iterator II, int SPAdj,
RegScavenger *RS) const {
MachineInstr &MI = *II;
MachineFunction &MF = *MI.getParent()->getParent();
MachineFrameInfo *MFI = MF.getFrameInfo();
MipsFunctionInfo *MipsFI = MF.getInfo<MipsFunctionInfo>();
unsigned i = 0;
while (!MI.getOperand(i).isFI()) {
@ -191,26 +193,45 @@ eliminateFrameIndex(MachineBasicBlock::iterator II, int SPAdj,
int NewImm = 0;
MachineBasicBlock &MBB = *MI.getParent();
bool ATUsed;
unsigned OrigReg = getFrameRegister(MF);
int OrigImm = Offset;
unsigned FrameReg;
const std::vector<CalleeSavedInfo> &CSI = MFI->getCalleeSavedInfo();
int MinCSFI = 0;
int MaxCSFI = -1;
// OrigImm fits in the 16-bit field
if (OrigImm < 0x8000 && OrigImm >= -0x8000) {
NewReg = OrigReg;
NewImm = OrigImm;
if (CSI.size()) {
MinCSFI = CSI[0].getFrameIdx();
MaxCSFI = CSI[CSI.size() - 1].getFrameIdx();
}
// The following stack frame objects are always referenced relative to $sp:
// 1. Outgoing arguments.
// 2. Pointer to dynamically allocated stack space.
// 3. Locations for callee-saved registers.
// Everything else is referenced relative to whatever register
// getFrameRegister() returns.
if (MipsFI->isOutArgFI(FrameIndex) ||
(FrameIndex >= MinCSFI && FrameIndex <= MaxCSFI))
FrameReg = Mips::SP;
else
FrameReg = getFrameRegister(MF);
// Offset fits in the 16-bit field
if (Offset < 0x8000 && Offset >= -0x8000) {
NewReg = FrameReg;
NewImm = Offset;
ATUsed = false;
}
else {
const TargetInstrInfo *TII = MF.getTarget().getInstrInfo();
DebugLoc DL = II->getDebugLoc();
int ImmLo = OrigImm & 0xffff;
int ImmHi = (((unsigned)OrigImm & 0xffff0000) >> 16) +
((OrigImm & 0x8000) != 0);
int ImmLo = Offset & 0xffff;
int ImmHi = (((unsigned)Offset & 0xffff0000) >> 16) +
((Offset & 0x8000) != 0);
// FIXME: change this when mips goes MC".
BuildMI(MBB, II, DL, TII->get(Mips::NOAT));
BuildMI(MBB, II, DL, TII->get(Mips::LUi), Mips::AT).addImm(ImmHi);
BuildMI(MBB, II, DL, TII->get(Mips::ADDu), Mips::AT).addReg(OrigReg)
BuildMI(MBB, II, DL, TII->get(Mips::ADDu), Mips::AT).addReg(FrameReg)
.addReg(Mips::AT);
NewReg = Mips::AT;
NewImm = ImmLo;