[llvm] [InstCombine] Fold Xor with or disjoint (PR #105992)

[via llvm-commits]

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@@ -0,0 +1,32 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 5
+; RUN: opt < %s -passes=instcombine -S | FileCheck %s
+
+define i32 @fold_xor_with_disjoint_or(i32 %a, i1 %c) {
+; CHECK-LABEL: define i32 @fold_xor_with_disjoint_or(
+; CHECK-SAME: i32 [[A:%.*]], i1 [[C:%.*]]) {
+; CHECK-NEXT:    [[SHL:%.*]] = shl i32 [[A]], 4
+; CHECK-NEXT:    [[TMP1:%.*]] = select i1 [[C]], i32 4, i32 0
+; CHECK-NEXT:    [[XOR:%.*]] = or disjoint i32 [[TMP1]], [[SHL]]
+; CHECK-NEXT:    ret i32 [[XOR]]
+;
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elhewaty wrote:

If you notice your change wasn't run the function wasn't called.

https://github.com/llvm/llvm-project/pull/105992