[llvm] [InstCombine] Thwart complexity-based canonicalization in shl-add test (NFC) (PR #91413)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-llvm-transforms

Author: AtariDreams (AtariDreams)

<details>
<summary>Changes</summary>

Extra test for #<!-- -->88193

---
Full diff: https://github.com/llvm/llvm-project/pull/91413.diff


1 Files Affected:

- (modified) llvm/test/Transforms/InstCombine/lshr.ll (+1) 


``````````diff
diff --git a/llvm/test/Transforms/InstCombine/lshr.ll b/llvm/test/Transforms/InstCombine/lshr.ll
index 563e669f90353..25e89c91a9e55 100644
--- a/llvm/test/Transforms/InstCombine/lshr.ll
+++ b/llvm/test/Transforms/InstCombine/lshr.ll
@@ -402,6 +402,7 @@ define i32 @shl_add_lshr_comm(i32 %x, i32 %c, i32 %y) {
 ; CHECK-NEXT:    ret i32 [[LSHR]]
 ;
   %shl = shl nuw i32 %x, %c
+  %xx = mul i32 %x, %x ; thwart complexity-based canonicalization
   %add = add nuw i32 %y, %shl
   %lshr = lshr i32 %add, %c
   ret i32 %lshr

``````````

</details>


https://github.com/llvm/llvm-project/pull/91413