diff options
Diffstat (limited to 'llvm/lib/Target/PowerPC/PPCInstrInfo.cpp')
| -rw-r--r-- | llvm/lib/Target/PowerPC/PPCInstrInfo.cpp | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/llvm/lib/Target/PowerPC/PPCInstrInfo.cpp b/llvm/lib/Target/PowerPC/PPCInstrInfo.cpp index 879bb4c797e..031e6689f18 100644 --- a/llvm/lib/Target/PowerPC/PPCInstrInfo.cpp +++ b/llvm/lib/Target/PowerPC/PPCInstrInfo.cpp @@ -2286,6 +2286,13 @@ MachineInstr *PPCInstrInfo::getConstantDefMI(MachineInstr &MI, MachineBasicBlock::reverse_iterator E = MI.getParent()->rend(), It = MI; It++; unsigned Reg = MI.getOperand(i).getReg(); + // MachineInstr::readsRegister only returns true if the machine + // instruction reads the exact register or its super-register. It + // does not consider uses of sub-registers which seems like strange + // behaviour. Nonetheless, if we end up with a 64-bit register here, + // get the corresponding 32-bit register to check. + if (PPC::G8RCRegClass.contains(Reg)) + Reg = Reg - PPC::X0 + PPC::R0; // Is this register defined by a load-immediate in this block? for ( ; It != E; ++It) { |
