[llvm] Combine (X ^ Y) and (X == Y) where appropriate (PR #130922)

[Craig Topper via llvm-commits]

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@@ -17194,8 +17194,41 @@ static bool combine_CC(SDValue &LHS, SDValue &RHS, SDValue &CC, const SDLoc &DL,
     return true;
   }
 
+  // If XOR is reused and has an immediate that will fit in XORI,
+  // do not fold
+  auto IsXorImmediate = [](const SDValue &Op) -> bool {
+    if (const auto XorCnst = dyn_cast<ConstantSDNode>(Op)) {
+      auto isLegalXorImmediate = [](int64_t Imm) -> bool {
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topperc wrote:

This lambda doesn't really improve the code. Just use the isInt<12> directly.

https://github.com/llvm/llvm-project/pull/130922