+ // We can end up with self copies and similar things as a result of VSX copy
+ // legalization. Promote them here.
+ const TargetRegisterInfo *TRI = &getRegisterInfo();
+ if (PPC::F8RCRegClass.contains(DestReg) &&
+ PPC::VSRCRegClass.contains(SrcReg)) {
+ unsigned SuperReg =
+ TRI->getMatchingSuperReg(DestReg, PPC::sub_64, &PPC::VSRCRegClass);
+
+ if (VSXSelfCopyCrash && SrcReg == SuperReg)
+ llvm_unreachable("nop VSX copy");
+
+ DestReg = SuperReg;
+ } else if (PPC::VRRCRegClass.contains(DestReg) &&
+ PPC::VSRCRegClass.contains(SrcReg)) {
+ unsigned SuperReg =
+ TRI->getMatchingSuperReg(DestReg, PPC::sub_128, &PPC::VSRCRegClass);
+
+ if (VSXSelfCopyCrash && SrcReg == SuperReg)
+ llvm_unreachable("nop VSX copy");
+
+ DestReg = SuperReg;
+ } else if (PPC::F8RCRegClass.contains(SrcReg) &&
+ PPC::VSRCRegClass.contains(DestReg)) {
+ unsigned SuperReg =
+ TRI->getMatchingSuperReg(SrcReg, PPC::sub_64, &PPC::VSRCRegClass);
+
+ if (VSXSelfCopyCrash && DestReg == SuperReg)
+ llvm_unreachable("nop VSX copy");
+
+ SrcReg = SuperReg;
+ } else if (PPC::VRRCRegClass.contains(SrcReg) &&
+ PPC::VSRCRegClass.contains(DestReg)) {
+ unsigned SuperReg =
+ TRI->getMatchingSuperReg(SrcReg, PPC::sub_128, &PPC::VSRCRegClass);
+
+ if (VSXSelfCopyCrash && DestReg == SuperReg)
+ llvm_unreachable("nop VSX copy");
+
+ SrcReg = SuperReg;
+ }
+
+ // Different class register copy
+ if (PPC::CRBITRCRegClass.contains(SrcReg) &&
+ PPC::GPRCRegClass.contains(DestReg)) {
+ unsigned CRReg = getCRFromCRBit(SrcReg);
+ BuildMI(MBB, I, DL, get(PPC::MFOCRF), DestReg)
+ .addReg(CRReg), getKillRegState(KillSrc);
+ // Rotate the CR bit in the CR fields to be the least significant bit and
+ // then mask with 0x1 (MB = ME = 31).
+ BuildMI(MBB, I, DL, get(PPC::RLWINM), DestReg)
+ .addReg(DestReg, RegState::Kill)
+ .addImm(TRI->getEncodingValue(CRReg) * 4 + (4 - getCRBitValue(SrcReg)))
+ .addImm(31)
+ .addImm(31);
+ return;
+ } else if (PPC::CRRCRegClass.contains(SrcReg) &&
+ PPC::G8RCRegClass.contains(DestReg)) {
+ BuildMI(MBB, I, DL, get(PPC::MFOCRF8), DestReg)
+ .addReg(SrcReg), getKillRegState(KillSrc);
+ return;
+ } else if (PPC::CRRCRegClass.contains(SrcReg) &&
+ PPC::GPRCRegClass.contains(DestReg)) {
+ BuildMI(MBB, I, DL, get(PPC::MFOCRF), DestReg)
+ .addReg(SrcReg), getKillRegState(KillSrc);
+ return;
+ }
+