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Fix spilling and reloading of CR regs to reload the right values. This fixes

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Olden/power (and probably others) with -regalloc=local.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28760 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2006-06-12 21:50:57 +00:00
parent 6edf399bb4
commit b47e0897a0
1 changed files with 24 additions and 2 deletions
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22
lib/Target/PowerPC/PPCRegisterInfo.cpp
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@@ -102,7 +102,19 @@ PPCRegisterInfo::storeRegToStackSlot(MachineBasicBlock &MBB,
BuildMI(MBB, MI, PPC::MFLR, 1, PPC::R11);
addFrameReference(BuildMI(MBB, MI, PPC::STW, 3).addReg(PPC::R11), FrameIdx);
} else if (RC == PPC::CRRCRegisterClass) {
// We need to store the CR in the low 4-bits of the saved value. First,
// issue a MFCR to save all of the CRBits.
BuildMI(MBB, MI, PPC::MFCR, 0, PPC::R11);
// If the saved register wasn't CR0, shift the bits left so that they are in
// CR0's slot.
if (SrcReg != PPC::CR0) {
unsigned ShiftBits = PPCRegisterInfo::getRegisterNumbering(SrcReg)*4;
// rlwinm r11, r11, ShiftBits, 0, 31.
BuildMI(MBB, MI, PPC::RLWINM, 4, PPC::R11)
.addReg(PPC::R11).addImm(ShiftBits).addImm(0).addImm(31);
}
addFrameReference(BuildMI(MBB, MI, PPC::STW, 3).addReg(PPC::R11), FrameIdx);
} else if (RC == PPC::GPRCRegisterClass) {
addFrameReference(BuildMI(MBB, MI, PPC::STW, 3).addReg(SrcReg),FrameIdx);
@@ -137,6 +149,16 @@ PPCRegisterInfo::loadRegFromStackSlot(MachineBasicBlock &MBB,
BuildMI(MBB, MI, PPC::MTLR, 1).addReg(PPC::R11);
} else if (RC == PPC::CRRCRegisterClass) {
addFrameReference(BuildMI(MBB, MI, PPC::LWZ, 2, PPC::R11), FrameIdx);
// If the reloaded register isn't CR0, shift the bits right so that they are
// in the right CR's slot.
if (DestReg != PPC::CR0) {
unsigned ShiftBits = PPCRegisterInfo::getRegisterNumbering(DestReg)*4;
// rlwinm r11, r11, 32-ShiftBits, 0, 31.
BuildMI(MBB, MI, PPC::RLWINM, 4, PPC::R11)
.addReg(PPC::R11).addImm(32-ShiftBits).addImm(0).addImm(31);
}
BuildMI(MBB, MI, PPC::MTCRF, 1, DestReg).addReg(PPC::R11);
} else if (RC == PPC::GPRCRegisterClass) {
addFrameReference(BuildMI(MBB, MI, PPC::LWZ, 2, DestReg), FrameIdx);