release/20.x: [AArch64] Add MSVC mangling for the __mfp8 type (#124968)

[llvmbot]

Backport 7939ce6

Requested by: @MacDue

[llvmbot]

@momchil-velikov What do you think about merging this PR to the release branch?

[llvmbot]

@llvm/pr-subscribers-clang

Author: None (llvmbot)

Changes

Backport 7939ce6

Requested by: @MacDue

---

Full diff: https://github.com/llvm/llvm-project/pull/125066.diff

2 Files Affected:

• (modified) clang/lib/AST/MicrosoftMangle.cpp (+5)
• (added) clang/test/CodeGenCXX/aarch64-ms-mangle-mfp8.cpp (+14)

diff --git a/clang/lib/AST/MicrosoftMangle.cpp b/clang/lib/AST/MicrosoftMangle.cpp
index edeeaeaa9ae17c..42b735ccf4a2ce 100644
--- a/clang/lib/AST/MicrosoftMangle.cpp
+++ b/clang/lib/AST/MicrosoftMangle.cpp
@@ -2792,6 +2792,10 @@ void MicrosoftCXXNameMangler::mangleType(const BuiltinType *T, Qualifiers,
     mangleArtificialTagType(TagTypeKind::Struct, "__bf16", {"__clang"});
     break;
 
+  case BuiltinType::MFloat8:
+    mangleArtificialTagType(TagTypeKind::Struct, "__mfp8", {"__clang"});
+    break;
+
 #define WASM_REF_TYPE(InternalName, MangledName, Id, SingletonId, AS)          \
   case BuiltinType::Id:                                                        \
     mangleArtificialTagType(TagTypeKind::Struct, MangledName);                 \
@@ -2808,6 +2812,7 @@ void MicrosoftCXXNameMangler::mangleType(const BuiltinType *T, Qualifiers,
 
 #define SVE_TYPE(Name, Id, SingletonId) \
   case BuiltinType::Id:
+#define SVE_SCALAR_TYPE(Name, MangledName, Id, SingletonId, Bits)
 #include "clang/Basic/AArch64SVEACLETypes.def"
 #define PPC_VECTOR_TYPE(Name, Id, Size) \
   case BuiltinType::Id:
diff --git a/clang/test/CodeGenCXX/aarch64-ms-mangle-mfp8.cpp b/clang/test/CodeGenCXX/aarch64-ms-mangle-mfp8.cpp
new file mode 100644
index 00000000000000..b5fd9171ad81a9
--- /dev/null
+++ b/clang/test/CodeGenCXX/aarch64-ms-mangle-mfp8.cpp
@@ -0,0 +1,14 @@
+// RUN: %clang_cc1 -triple aarch64-windows-msvc -emit-llvm -o - %s | FileCheck %s
+
+typedef __mfp8 mf8;
+typedef __attribute__((neon_vector_type(8))) __mfp8 mf8x8_t;
+typedef __attribute__((neon_vector_type(16))) __mfp8 mf8x16_t;
+
+// CHECK: "?f@@YAXU__mfp8@__clang@@@Z"
+void f(mf8 v) {}
+
+// CHECK: "?f@@YAXT?$__vector@U__mfp8@__clang@@$07@__clang@@@Z"
+void f(mf8x8_t v) {}
+
+// CHECK: "?f@@YAXT?$__vector@U__mfp8@__clang@@$0BA@@__clang@@@Z"
+void f(mf8x16_t v) {}

[github-actions]

@MacDue (or anyone else). If you would like to add a note about this fix in the release notes (completely optional). Please reply to this comment with a one or two sentence description of the fix. When you are done, please add the release:note label to this PR.