diff options
Diffstat (limited to 'lib/Target/PowerPC/PPCRegisterInfo.cpp')
| -rw-r--r-- | lib/Target/PowerPC/PPCRegisterInfo.cpp | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/lib/Target/PowerPC/PPCRegisterInfo.cpp b/lib/Target/PowerPC/PPCRegisterInfo.cpp index 2be6324fd7..7a74f3d459 100644 --- a/lib/Target/PowerPC/PPCRegisterInfo.cpp +++ b/lib/Target/PowerPC/PPCRegisterInfo.cpp @@ -136,6 +136,11 @@ BitVector PPCRegisterInfo::getReservedRegs(const MachineFunction &MF) const { Reserved.set(PPC::FP); Reserved.set(PPC::FP8); + // The counter registers must be reserved so that counter-based loops can + // be correctly formed (and the mtctr instructions are not DCE'd). + Reserved.set(PPC::CTR); + Reserved.set(PPC::CTR8); + Reserved.set(PPC::R1); Reserved.set(PPC::LR); Reserved.set(PPC::LR8); |