diff options
Diffstat (limited to 'llvm/lib/Target')
| -rw-r--r-- | llvm/lib/Target/PowerPC/PPCInstrInfo.cpp | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/llvm/lib/Target/PowerPC/PPCInstrInfo.cpp b/llvm/lib/Target/PowerPC/PPCInstrInfo.cpp index cacbe4eecc5..0799c4281e3 100644 --- a/llvm/lib/Target/PowerPC/PPCInstrInfo.cpp +++ b/llvm/lib/Target/PowerPC/PPCInstrInfo.cpp @@ -1653,6 +1653,7 @@ bool PPCInstrInfo::optimizeCompareInstr(MachineInstr &CmpInstr, unsigned SrcReg, if (OpC == PPC::FCMPUS || OpC == PPC::FCMPUD) return false; + const TargetRegisterInfo *TRI = &getRegisterInfo(); // The record forms set the condition register based on a signed comparison // with zero (so says the ISA manual). This is not as straightforward as it // seems, however, because this is always a 64-bit comparison on PPC64, even @@ -1666,6 +1667,11 @@ bool PPCInstrInfo::optimizeCompareInstr(MachineInstr &CmpInstr, unsigned SrcReg, bool is32BitUnsignedCompare = OpC == PPC::CMPLWI || OpC == PPC::CMPLW; bool is64BitUnsignedCompare = OpC == PPC::CMPLDI || OpC == PPC::CMPLD; + // Look through copies unless that gets us to a physical register. + unsigned ActualSrc = TRI->lookThruCopyLike(SrcReg, MRI); + if (TargetRegisterInfo::isVirtualRegister(ActualSrc)) + SrcReg = ActualSrc; + // Get the unique definition of SrcReg. MachineInstr *MI = MRI->getUniqueVRegDef(SrcReg); if (!MI) return false; @@ -1794,7 +1800,6 @@ bool PPCInstrInfo::optimizeCompareInstr(MachineInstr &CmpInstr, unsigned SrcReg, } // Search for Sub. - const TargetRegisterInfo *TRI = &getRegisterInfo(); --I; // Get ready to iterate backward from CmpInstr. |
