[llvm] [AMDGPU] Use correct vector elt type when shrinking mfma scale (PR #123043)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-backend-amdgpu

Author: Fraser Cormack (frasercrmck)

<details>
<summary>Changes</summary>

This might be a copy/paste error. I don't think this an issue in practice as the builtins/intrinsics are only legal with identical vector element types.

---
Full diff: https://github.com/llvm/llvm-project/pull/123043.diff


1 Files Affected:

- (modified) llvm/lib/Target/AMDGPU/AMDGPUInstCombineIntrinsic.cpp (+1-1) 


``````````diff
diff --git a/llvm/lib/Target/AMDGPU/AMDGPUInstCombineIntrinsic.cpp b/llvm/lib/Target/AMDGPU/AMDGPUInstCombineIntrinsic.cpp
index 8b1b398606583e..bac3bb5fde7b02 100644
--- a/llvm/lib/Target/AMDGPU/AMDGPUInstCombineIntrinsic.cpp
+++ b/llvm/lib/Target/AMDGPU/AMDGPUInstCombineIntrinsic.cpp
@@ -1346,7 +1346,7 @@ GCNTTIImpl::instCombineIntrinsic(InstCombiner &IC, IntrinsicInst &II) const {
 
     if (Src1Ty->getNumElements() > Src1NumElts) {
       Src1 = IC.Builder.CreateExtractVector(
-          FixedVectorType::get(Src0Ty->getElementType(), Src1NumElts), Src1,
+          FixedVectorType::get(Src1Ty->getElementType(), Src1NumElts), Src1,
           IC.Builder.getInt64(0));
       MadeChange = true;
     }

``````````

</details>


https://github.com/llvm/llvm-project/pull/123043