[llvm] [X86][CodeGen] Support lowering for CCMP/CTEST (PR #91747)

[Evgenii Kudriashov via llvm-commits]

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@@ -54508,7 +54513,97 @@ static bool onlyZeroFlagUsed(SDValue Flags) {
   return true;
 }
 
+static SDValue
+combineX86SubCmpToCcmpHelper(SDNode *N, SDValue Flag, SelectionDAG &DAG,
+                             TargetLowering::DAGCombinerInfo &DCI,
+                             const X86Subtarget &ST) {
+  // sub(and(setcc(cc0, flag0), setcc(cc1, sub (X, Y))), 1)
+  // brcond ne
+  //
+  // OR
+  //
+  // sub(and(setcc(cc0, flag0), setcc(cc1, sub (X, Y))), 1)
+  // brcond ne
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e-kud wrote:

Are these parts of OR the same? Guess we expect to see `sub` on different place.

https://github.com/llvm/llvm-project/pull/91747