[llvm] Fix min_vec_size.ll test for changes in vector-combine (PR #145392)
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Mon Jun 23 12:16:12 PDT 2025
llvmbot wrote:
<!--LLVM PR SUMMARY COMMENT-->
@llvm/pr-subscribers-backend-directx
Author: Tex Riddell (tex3d)
<details>
<summary>Changes</summary>
Running the `vector-combine` pass on this test now produces a single shuffle on a loaded `<1 x float>` instead of an insert into a `<2 x float>` followed by a shuffle. This looks like a valid optimization.
---
Full diff: https://github.com/llvm/llvm-project/pull/145392.diff
1 Files Affected:
- (modified) llvm/test/CodeGen/DirectX/min_vec_size.ll (+1-2)
``````````diff
diff --git a/llvm/test/CodeGen/DirectX/min_vec_size.ll b/llvm/test/CodeGen/DirectX/min_vec_size.ll
index ba6e83ea83733..a2883a4945774 100644
--- a/llvm/test/CodeGen/DirectX/min_vec_size.ll
+++ b/llvm/test/CodeGen/DirectX/min_vec_size.ll
@@ -6,8 +6,7 @@ target triple = "dxil-unknown-shadermodel6.7-library"
; Make sure vec combine min vec size is 1 instead of 4 for float.
; CHECK:@foo()
; CHECK-NEXT:%[[LD:[0-9]+]] = load <1 x float>, ptr @a, align 8
-; CHECK-NEXT:%insert = shufflevector <1 x float> %[[LD]], <1 x float> poison, <2 x i32> <i32 0, i32 poison>
-; CHECK-NEXT:%shuffle = shufflevector <2 x float> %insert, <2 x float> poison, <2 x i32> zeroinitializer
+; CHECK-NEXT:%shuffle = shufflevector <1 x float> %1, <1 x float> poison, <2 x i32> zeroinitializer
; CHECK-NEXT:ret <2 x float> %shuffle
@a = external local_unnamed_addr constant float
``````````
</details>
https://github.com/llvm/llvm-project/pull/145392
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