6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2024-12-14 11:32:34 +00:00
Code Issues Projects Releases Wiki Activity

Fix rewriting frame offsets with ixaddr instructions, which implicitly shift

Browse Source 
the offset two bits to the left.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28933 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2006-06-27 18:55:49 +00:00
parent 5f9faeaa78
commit 7ffa9abdad
1 changed files with 21 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

29
lib/Target/PowerPC/PPCRegisterInfo.cpp
View File

@ -390,9 +390,27 @@ PPCRegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator II) const {
// Take into account whether it's an add or mem instruction
unsigned OffIdx = (i == 2) ? 1 : 2;
// Figure out if the offset in the instruction is shifted right two bits. This
// is true for instructions like "STD", which the machine implicitly adds two
// low zeros to.
bool isIXAddr = false;
switch (MI.getOpcode()) {
case PPC::LWA:
case PPC::LD:
case PPC::STD:
case PPC::STD_32:
isIXAddr = true;
break;
}
// Now add the frame object offset to the offset from r1.
int Offset = MF.getFrameInfo()->getObjectOffset(FrameIndex) +
MI.getOperand(OffIdx).getImmedValue();
int Offset = MF.getFrameInfo()->getObjectOffset(FrameIndex);
if (!isIXAddr)
Offset += MI.getOperand(OffIdx).getImmedValue();
else
Offset += MI.getOperand(OffIdx).getImmedValue() << 2;
// If we're not using a Frame Pointer that has been set to the value of the
// SP before having the stack size subtracted from it, then add the stack size
@ -415,14 +433,9 @@ PPCRegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator II) const {
MI.getOperand(1).ChangeToRegister(MI.getOperand(i).getReg());
MI.getOperand(2).ChangeToRegister(PPC::R0);
} else {
switch (MI.getOpcode()) {
case PPC::LWA:
case PPC::LD:
case PPC::STD:
case PPC::STD_32:
if (isIXAddr) {
assert((Offset & 3) == 0 && "Invalid frame offset!");
Offset >>= 2; // The actual encoded value has the low two bits zero.
break;
}
MI.getOperand(OffIdx).ChangeToImmediate(Offset);
}