[llvm] [X86][CodeGen] Return true when MIR is changed after optimizeCompareInstr (PR #91723)

[Shengchen Kan via llvm-commits]

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@@ -5169,7 +5169,7 @@ bool X86InstrInfo::optimizeCompareInstr(MachineInstr &CmpInstr, Register SrcReg,
     // Fall through to optimize Cmp if Cmp is CMPrr or CMPri.
     if (NewOpcode == X86::CMP64rm || NewOpcode == X86::CMP32rm ||
         NewOpcode == X86::CMP16rm || NewOpcode == X86::CMP8rm)
-      return false;
+      return true;
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KanRobert wrote:

Ah, good point. It's still buggy.

https://github.com/llvm/llvm-project/pull/91723