[PATCH] D136919: [X86][RFC] Change mangle name of __bf16 from u6__bf16 to DF16b

[Phoebe Wang via Phabricator via cfe-commits]

pengfei created this revision.
pengfei added reviewers: RKSimon, ldionne, bkramer.
Herald added a project: All.
pengfei requested review of this revision.
Herald added a project: clang.
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GCC folks decided to make the mangling of __bf16 the same as std::bfloat16_t.
We need to match with GCC: https://godbolt.org/z/jjne5qxPa
Other targets may still use their own mangling way.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D136919

Files:
  clang/lib/Basic/Targets/X86.h
  clang/test/CodeGen/X86/bfloat-mangle.cpp


Index: clang/test/CodeGen/X86/bfloat-mangle.cpp
===================================================================
--- clang/test/CodeGen/X86/bfloat-mangle.cpp
+++ clang/test/CodeGen/X86/bfloat-mangle.cpp
@@ -3,6 +3,6 @@
 // RUN: %clang_cc1 -triple i386-windows-msvc -target-feature +sse2 -emit-llvm -o - %s | FileCheck %s --check-prefixes=WINDOWS
 // RUN: %clang_cc1 -triple x86_64-windows-msvc -target-feature +sse2 -emit-llvm -o - %s | FileCheck %s --check-prefixes=WINDOWS
 
-// LINUX: define {{.*}}void @_Z3foou6__bf16(bfloat noundef %b)
+// LINUX: define {{.*}}void @_Z3fooDF16b(bfloat noundef %b)
 // WINDOWS: define {{.*}}void @"?foo@@YAXU__bf16 at __clang@@@Z"(bfloat noundef %b)
 void foo(__bf16 b) {}
Index: clang/lib/Basic/Targets/X86.h
===================================================================
--- clang/lib/Basic/Targets/X86.h
+++ clang/lib/Basic/Targets/X86.h
@@ -410,7 +410,7 @@
     return getPointerWidthV(AddrSpace);
   }
 
-  const char *getBFloat16Mangling() const override { return "u6__bf16"; };
+  const char *getBFloat16Mangling() const override { return "DF16b"; };
 };
 
 // X86-32 generic target


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