+ if (HasBP && MaxAlign > 1)
+ assert(isPowerOf2_32(MaxAlign) && isInt<16>(MaxAlign) &&
+ "Invalid alignment!");
+
+ // Frames of 32KB & larger require special handling because they cannot be
+ // indexed into with a simple STDU/STWU/STD/STW immediate offset operand.
+ bool isLargeFrame = !isInt<16>(NegFrameSize);
+
+ if (MustSaveLR)
+ BuildMI(MBB, MBBI, dl, MFLRInst, ScratchReg);
+
+ assert((isPPC64 || MustSaveCRs.empty()) &&
+ "Prologue CR saving supported only in 64-bit mode");
+
+ if (!MustSaveCRs.empty()) { // will only occur for PPC64
+ // FIXME: In the ELFv2 ABI, we are not required to save all CR fields.
+ // If only one or two CR fields are clobbered, it could be more
+ // efficient to use mfocrf to selectively save just those fields.
+ MachineInstrBuilder MIB =
+ BuildMI(MBB, MBBI, dl, TII.get(PPC::MFCR8), TempReg);
+ for (unsigned i = 0, e = MustSaveCRs.size(); i != e; ++i)
+ MIB.addReg(MustSaveCRs[i], RegState::ImplicitKill);
+ }
+
+ if (HasFP)
+ // FIXME: On PPC32 SVR4, we must not spill before claiming the stackframe.
+ BuildMI(MBB, MBBI, dl, StoreInst)
+ .addReg(FPReg)
+ .addImm(FPOffset)
+ .addReg(SPReg);
+
+ if (HasBP)
+ // FIXME: On PPC32 SVR4, we must not spill before claiming the stackframe.
+ BuildMI(MBB, MBBI, dl, StoreInst)
+ .addReg(BPReg)
+ .addImm(BPOffset)
+ .addReg(SPReg);
+
+ if (MustSaveLR)
+ // FIXME: On PPC32 SVR4, we must not spill before claiming the stackframe.
+ BuildMI(MBB, MBBI, dl, StoreInst)
+ .addReg(ScratchReg)
+ .addImm(LROffset)
+ .addReg(SPReg);
+
+ if (!MustSaveCRs.empty()) // will only occur for PPC64
+ BuildMI(MBB, MBBI, dl, TII.get(PPC::STW8))
+ .addReg(TempReg, getKillRegState(true))
+ .addImm(8)
+ .addReg(SPReg);
+
+ // Skip the rest if this is a leaf function & all spills fit in the Red Zone.
+ if (!FrameSize) return;