[clang] [clang] Fix vectorcall HVA/HFA returns on x86 MSVC ABI (PR #203925)

via cfe-commits cfe-commits at lists.llvm.org
Mon Jun 15 08:36:24 PDT 2026


github-actions[bot] wrote:

<!--LLVM CODE FORMAT COMMENT: {clang-format}-->


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<summary>
You can test this locally with the following command:
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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp -- clang/test/CodeGenCXX/microsoft-abi-vectorcall-hva.cpp clang/lib/CodeGen/MicrosoftCXXABI.cpp clang/test/CodeGenCXX/homogeneous-aggregates.cpp --diff_from_common_commit
``````````

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The reproduction instructions above might return results for more than one PR
in a stack if you are using a stacked PR workflow. You can limit the results by
changing `origin/main` to the base branch/commit you want to compare against.
:warning:

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<details>
<summary>
View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/CodeGen/MicrosoftCXXABI.cpp b/clang/lib/CodeGen/MicrosoftCXXABI.cpp
index b24595036..42a33028d 100644
--- a/clang/lib/CodeGen/MicrosoftCXXABI.cpp
+++ b/clang/lib/CodeGen/MicrosoftCXXABI.cpp
@@ -1199,7 +1199,8 @@ bool MicrosoftCXXABI::classifyReturnType(CGFunctionInfo &FI) const {
       FI.getCallingConvention() == llvm::CallingConv::X86_VectorCall) {
     const Type *Base = nullptr;
     uint64_t NumElts = 0;
-    if (CGM.getABIInfo().isHomogeneousAggregate(FI.getReturnType(), Base, NumElts))
+    if (CGM.getABIInfo().isHomogeneousAggregate(FI.getReturnType(), Base,
+                                                NumElts))
       isTrivialForABI = true;
   }
 

``````````

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https://github.com/llvm/llvm-project/pull/203925


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