[llvm] [InstCombine][NFC] Add tests for shifts of constants by common factor (PR #103471)
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Tue Aug 13 14:25:05 PDT 2024
llvmbot wrote:
<!--LLVM PR SUMMARY COMMENT-->
@llvm/pr-subscribers-llvm-transforms
Author: Kevin McAfee (kalxr)
<details>
<summary>Changes</summary>
---
Full diff: https://github.com/llvm/llvm-project/pull/103471.diff
1 Files Affected:
- (modified) llvm/test/Transforms/InstCombine/shl-factor.ll (+24)
``````````diff
diff --git a/llvm/test/Transforms/InstCombine/shl-factor.ll b/llvm/test/Transforms/InstCombine/shl-factor.ll
index 38eecaeff8e41e..996b15f27f6d34 100644
--- a/llvm/test/Transforms/InstCombine/shl-factor.ll
+++ b/llvm/test/Transforms/InstCombine/shl-factor.ll
@@ -265,3 +265,27 @@ define i6 @sub_shl_same_amount_partial_nuw2(i6 %x, i6 %y, i6 %z) {
ret i6 %diff
}
+define i8 @add_shl_same_amount_constants(i8 %z) {
+; CHECK-LABEL: @add_shl_same_amount_constants(
+; CHECK-NEXT: [[SUM:%.*]] = shl i8 7, [[Z:%.*]]
+; CHECK-NEXT: ret i8 [[SUM]]
+;
+ %s1 = shl i8 4, %z
+ %s2 = shl i8 3, %z
+ %sum = add i8 %s1, %s2
+ ret i8 %sum
+}
+
+define i8 @add_shl_same_amount_constants_extra_use(i8 %z) {
+; CHECK-LABEL: @add_shl_same_amount_constants_extra_use(
+; CHECK-NEXT: [[S1:%.*]] = shl i8 4, [[Z:%.*]]
+; CHECK-NEXT: [[SUM:%.*]] = shl i8 7, [[Z]]
+; CHECK-NEXT: call void @use8(i8 [[S1]])
+; CHECK-NEXT: ret i8 [[SUM]]
+;
+ %s1 = shl i8 4, %z
+ %s2 = shl i8 3, %z
+ %sum = add i8 %s1, %s2
+ call void @use8(i8 %s1)
+ ret i8 %sum
+}
``````````
</details>
https://github.com/llvm/llvm-project/pull/103471
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