================
@@ -3267,10 +3267,13 @@ bool AArch64FrameLowering::spillCalleeSavedRegisters(
InsertSEH(MIB, TII, MachineInstr::FrameSetup);
} else { // The code when the pair of ZReg is not present
MachineInstrBuilder MIB = BuildMI(MBB, MI, DL, TII.get(StrOpc));
- if (!MRI.isReserved(Reg1))
+ const AArch64RegisterInfo *RegInfo =
+ static_cast<const AArch64RegisterInfo *>(
+ MF.getSubtarget().getRegisterInfo());
+ if (!RegInfo->isStrictlyReservedReg(MF, Reg1))
----------------
aemerson wrote:
> We could unreserve LR after register allocation, I guess? That would have
> roughly the right semantics.
Having `getReservedRegs(MF)` return different things depending on where it's
running seems worse than the bug itself.
With shrink-wrapping the prolog can be in successor blocks, so LR can be live
on some CFG paths and not others.
https://github.com/llvm/llvm-project/pull/98073
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