[clang] [llvm] [X86][APX] Emit SetZUCC instead of legacy setcc when ZU is enabled (PR #173965)

[Feng Zou via cfe-commits]

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@@ -1434,6 +1434,10 @@ bool X86FastISel::X86FastEmitCompare(const Value *Op0, const Value *Op1, EVT VT,
   return true;
 }
 
+#define GET_SETCC                                                              \
+  ((Subtarget->hasZU() && !Subtarget->preferSetCC()) ? X86::SETZUCCr           \
+                                                     : X86::SETCCr)
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fzou1 wrote:

Right. Updated as `SETCCr` is the instruction likely to be emitted. The condition of emitting SETCCr is `!Subtarget->hasZU() || Subtarget->preferSetCC()` (when ZU is not enabled or preferSetCC tuning is set).

https://github.com/llvm/llvm-project/pull/173965