[llvm] [AArch64] Remove copy in SVE/SME predicate spill (PR #81716)

[Sam Tebbs via llvm-commits]

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@@ -4807,8 +4808,9 @@ void AArch64InstrInfo::storeRegToStackSlot(MachineBasicBlock &MBB,
              "Unexpected register store without SVE2p1 or SME2");
       if (SrcReg.isVirtual()) {
         auto NewSrcReg =
-            MF.getRegInfo().createVirtualRegister(&AArch64::PPRRegClass);
-        BuildMI(MBB, MBBI, DebugLoc(), get(TargetOpcode::COPY), NewSrcReg)
+            MF.getRegInfo().createVirtualRegister(&AArch64::PPR_p8to15RegClass);
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SamTebbs33 wrote:

I like that approach, thanks Graham. It can also be used to get rid of the fill copy.

I'll implement this and adjust the tests accordingly.

https://github.com/llvm/llvm-project/pull/81716