[llvm] [X86][APX] Exclusively emit setzucc to avoid false dependency (PR #142092)

[Phoebe Wang via llvm-commits]

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@@ -79,10 +79,11 @@ bool X86FixupSetCCPass::runOnMachineFunction(MachineFunction &MF) {
       if (MI.definesRegister(X86::EFLAGS, /*TRI=*/nullptr))
         FlagsDefMI = &MI;
 
-      // Find a setcc that is used by a zext.
+      // Find a setcc/setzucc (if ZU is enabled) that is used by a zext.
       // This doesn't have to be the only use, the transformation is safe
       // regardless.
-      if (MI.getOpcode() != X86::SETCCr)
+      if (MI.getOpcode() != X86::SETCCr &&
+          (!ST->hasZU() || MI.getOpcode() != X86::SETZUCCr))
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phoebewang wrote:

`hasZU` is not needed.

https://github.com/llvm/llvm-project/pull/142092