[llvm] [InstCombine] Missed optimization: Fold (sext(a) & c1) == c2 to (a & c3) == trunc(c2) (PR #112646)

[via llvm-commits]

================
@@ -7687,6 +7687,30 @@ Instruction *InstCombinerImpl::visitICmpInst(ICmpInst &I) {
   if (Instruction *Res = foldReductionIdiom(I, Builder, DL))
     return Res;
 
+  {
+    Value *A;
+    const APInt *C1, *C2;
+    ICmpInst::Predicate PredEq = ICmpInst::ICMP_EQ;
----------------
XChy wrote:

What about `icmp ne` cases? See https://alive2.llvm.org/ce/z/MUHREP

https://github.com/llvm/llvm-project/pull/112646