[llvm] [X86] Extend `combinei64TruncSrlAdd` to handle patterns with `or` and `xor` (PR #128435)

[João Gouveia via llvm-commits]

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@@ -128,6 +128,103 @@ define i32 @test_trunc_add(i64 %x) {
   ret i32 %conv
 }
 
+define i32 @test_trunc_sub(i64 %x) {
+; X64-LABEL: test_trunc_sub:
+; X64:       # %bb.0:
+; X64-NEXT:    shrq $48, %rdi
+; X64-NEXT:    addl $65522, %edi # imm = 0xFFF2
+; X64-NEXT:    movzwl %di, %eax
+; X64-NEXT:    retq
+  %sub = sub i64 %x, 3940649673949184
+  %shr = lshr i64 %sub, 48
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joaotgouveia wrote:

Sure. Is changing one test enough, or should I change more than one?

https://github.com/llvm/llvm-project/pull/128435