[llvm] [AArch64] Drop poison-generating flags in `genSubAdd2SubSub` combiner (PR #90028)

[via llvm-commits]

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@@ -6924,14 +6924,20 @@ genSubAdd2SubSub(MachineFunction &MF, MachineRegisterInfo &MRI,
     assert((Opcode == AArch64::SUBWrr || Opcode == AArch64::SUBXrr) &&
            "Unexpected instruction opcode.");
 
+  Root.mergeFlagsWith(*AddMI);
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v01dXYZ wrote:

Hi,
I think you made a little mistake as `mergeFlagsWith` is a const method.

 

https://github.com/llvm/llvm-project/pull/90028