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| author | Hal Finkel <hfinkel@anl.gov> | 2013-03-19 08:09:38 +0000 |
|---|---|---|
| committer | Hal Finkel <hfinkel@anl.gov> | 2013-03-19 08:09:38 +0000 |
| commit | 54e57f8cb79bdc23ed8289cf2a558fa7c9602972 (patch) | |
| tree | df7ed3c8fb6d2fd5d6e7bf7f7340a16e5b7dad22 /lib/Target/PowerPC/PPCRegisterInfo.cpp | |
| parent | d37c8568e68d0ea3492503cd192783900e2d922a (diff) | |
| download | llvm-54e57f8cb79bdc23ed8289cf2a558fa7c9602972.tar.gz llvm-54e57f8cb79bdc23ed8289cf2a558fa7c9602972.tar.bz2 llvm-54e57f8cb79bdc23ed8289cf2a558fa7c9602972.tar.xz | |
Don't reserve R31 on PPC64 unless the frame pointer is needed
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@177379 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Target/PowerPC/PPCRegisterInfo.cpp')
| -rw-r--r-- | lib/Target/PowerPC/PPCRegisterInfo.cpp | 7 |
1 files changed, 3 insertions, 4 deletions
diff --git a/lib/Target/PowerPC/PPCRegisterInfo.cpp b/lib/Target/PowerPC/PPCRegisterInfo.cpp index e2c7221be3..74261a3a50 100644 --- a/lib/Target/PowerPC/PPCRegisterInfo.cpp +++ b/lib/Target/PowerPC/PPCRegisterInfo.cpp @@ -117,16 +117,15 @@ BitVector PPCRegisterInfo::getReservedRegs(const MachineFunction &MF) const { } // On PPC64, r13 is the thread pointer. Never allocate this register. - // Note that this is over conservative, as it also prevents allocation of R31 - // when the FP is not needed. if (Subtarget.isPPC64()) { Reserved.set(PPC::R13); - Reserved.set(PPC::R31); Reserved.set(PPC::X0); Reserved.set(PPC::X1); Reserved.set(PPC::X13); - Reserved.set(PPC::X31); + + if (PPCFI->needsFP(MF)) + Reserved.set(PPC::X31); // The 64-bit SVR4 ABI reserves r2 for the TOC pointer. if (Subtarget.isSVR4ABI()) { |