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| author | Hal Finkel <hfinkel@anl.gov> | 2013-03-23 17:14:27 +0000 |
|---|---|---|
| committer | Hal Finkel <hfinkel@anl.gov> | 2013-03-23 17:14:27 +0000 |
| commit | 7257fda1b3b047f6fd46df8a9999580fcfafbfae (patch) | |
| tree | e6735a86d0b1bedcf457886f9585064903d65780 | |
| parent | 7cdba152bbe4debfb58ed6d9559ef77aae8a0b31 (diff) | |
| download | external_llvm-7257fda1b3b047f6fd46df8a9999580fcfafbfae.zip external_llvm-7257fda1b3b047f6fd46df8a9999580fcfafbfae.tar.gz external_llvm-7257fda1b3b047f6fd46df8a9999580fcfafbfae.tar.bz2 | |
Remove dead PPC LR spilling code
The LR register is unconditionally reserved, and its spilling and restoration
is handled by the prologue/epilogue code. As a result, it is never explicitly
spilled by the register allocator.
No functionality change intended.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@177823 91177308-0d34-0410-b5e6-96231b3b80d8
| -rw-r--r-- | lib/Target/PowerPC/PPCInstrInfo.cpp | 38 |
1 files changed, 8 insertions, 30 deletions
diff --git a/lib/Target/PowerPC/PPCInstrInfo.cpp b/lib/Target/PowerPC/PPCInstrInfo.cpp index 71683d7..21e6248 100644 --- a/lib/Target/PowerPC/PPCInstrInfo.cpp +++ b/lib/Target/PowerPC/PPCInstrInfo.cpp @@ -443,37 +443,15 @@ PPCInstrInfo::StoreRegToStackSlot(MachineFunction &MF, bool &NonRI) const{ DebugLoc DL; if (PPC::GPRCRegClass.hasSubClassEq(RC)) { - if (SrcReg != PPC::LR) { - NewMIs.push_back(addFrameReference(BuildMI(MF, DL, get(PPC::STW)) - .addReg(SrcReg, - getKillRegState(isKill)), - FrameIdx)); - } else { - // FIXME: this spills LR immediately to memory in one step. To do this, - // we use R11, which we know cannot be used in the prolog/epilog. This is - // a hack. - NewMIs.push_back(BuildMI(MF, DL, get(PPC::MFLR), PPC::R11)); - NewMIs.push_back(addFrameReference(BuildMI(MF, DL, get(PPC::STW)) - .addReg(PPC::R11, - getKillRegState(isKill)), - FrameIdx)); - } + NewMIs.push_back(addFrameReference(BuildMI(MF, DL, get(PPC::STW)) + .addReg(SrcReg, + getKillRegState(isKill)), + FrameIdx)); } else if (PPC::G8RCRegClass.hasSubClassEq(RC)) { - if (SrcReg != PPC::LR8) { - NewMIs.push_back(addFrameReference(BuildMI(MF, DL, get(PPC::STD)) - .addReg(SrcReg, - getKillRegState(isKill)), - FrameIdx)); - } else { - // FIXME: this spills LR immediately to memory in one step. To do this, - // we use X11, which we know cannot be used in the prolog/epilog. This is - // a hack. - NewMIs.push_back(BuildMI(MF, DL, get(PPC::MFLR8), PPC::X11)); - NewMIs.push_back(addFrameReference(BuildMI(MF, DL, get(PPC::STD)) - .addReg(PPC::X11, - getKillRegState(isKill)), - FrameIdx)); - } + NewMIs.push_back(addFrameReference(BuildMI(MF, DL, get(PPC::STD)) + .addReg(SrcReg, + getKillRegState(isKill)), + FrameIdx)); } else if (PPC::F8RCRegClass.hasSubClassEq(RC)) { NewMIs.push_back(addFrameReference(BuildMI(MF, DL, get(PPC::STFD)) .addReg(SrcReg, |