diff options
Diffstat (limited to 'llvm/lib/Target/PowerPC/PPCISelLowering.cpp')
| -rw-r--r-- | llvm/lib/Target/PowerPC/PPCISelLowering.cpp | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/llvm/lib/Target/PowerPC/PPCISelLowering.cpp b/llvm/lib/Target/PowerPC/PPCISelLowering.cpp index 1d9181b95d1..c414a1512e9 100644 --- a/llvm/lib/Target/PowerPC/PPCISelLowering.cpp +++ b/llvm/lib/Target/PowerPC/PPCISelLowering.cpp @@ -8507,8 +8507,17 @@ PPCTargetLowering::EmitAtomicBinary(MachineInstr &MI, MachineBasicBlock *BB, if (BinOpcode) BuildMI(BB, dl, TII->get(BinOpcode), TmpReg).addReg(incr).addReg(dest); if (CmpOpcode) { - BuildMI(BB, dl, TII->get(CmpOpcode), PPC::CR0) - .addReg(incr).addReg(dest); + // Signed comparisons of byte or halfword values must be sign-extended. + if (CmpOpcode == PPC::CMPW && AtomicSize < 4) { + unsigned ExtReg = RegInfo.createVirtualRegister(&PPC::GPRCRegClass); + BuildMI(BB, dl, TII->get(AtomicSize == 1 ? PPC::EXTSB : PPC::EXTSH), + ExtReg).addReg(dest); + BuildMI(BB, dl, TII->get(CmpOpcode), PPC::CR0) + .addReg(incr).addReg(ExtReg); + } else + BuildMI(BB, dl, TII->get(CmpOpcode), PPC::CR0) + .addReg(incr).addReg(dest); + BuildMI(BB, dl, TII->get(PPC::BCC)) .addImm(CmpPred).addReg(PPC::CR0).addMBB(exitMBB); BB->addSuccessor(loop2MBB); |
