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llvm-project/clang/test/CodeGen/calling-conv-ignored.c

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[MS] Treat ignored explicit calling conventions as an explicit __cdecl The CCCR_Ignore action is only used for Microsoft calling conventions, mainly because MSVC does not warn when a calling convention would be ignored by the current target. This behavior is actually somewhat important, since windows.h uses WINAPI (which expands to __stdcall) widely. This distinction didn't matter much before the introduction of __vectorcall to x64 and the ability to make that the default calling convention with /Gv. Now, we can't just ignore __stdcall for x64, we have to treat it as an explicit __cdecl annotation. Fixes PR42531 llvm-svn: 365579
2019-07-10 07:17:43 +08:00
// RUN: %clang_cc1 -triple i686-windows-msvc -emit-llvm -o - %s | FileCheck %s --check-prefix=X86
// RUN: %clang_cc1 -triple x86_64-windows-msvc -emit-llvm -o - %s | FileCheck %s --check-prefix=X64
// RUN: %clang_cc1 -triple i686-windows-msvc -emit-llvm -o - %s -fdefault-calling-conv=vectorcall | FileCheck %s --check-prefix=X86-VEC
// RUN: %clang_cc1 -triple x86_64-windows-msvc -emit-llvm -o - %s -fdefault-calling-conv=vectorcall | FileCheck %s --check-prefix=X64-VEC
void foo_default(const char *lpString1, const char *lpString2);
void __stdcall foo_std(const char *lpString1, const char *lpString2);
void __fastcall foo_fast(const char *lpString1, const char *lpString2);
void __vectorcall foo_vector(const char *lpString1, const char *lpString2);
void __cdecl bar() {
foo_default(0, 0);
foo_std(0, 0);
foo_fast(0, 0);
foo_vector(0, 0);
}
// X86-LABEL: define dso_local void @bar()
// X86: call void @foo_default(i8* null, i8* null)
// X86: call x86_stdcallcc void @"\01_foo_std@8"(i8* null, i8* null)
// X86: call x86_fastcallcc void @"\01@foo_fast@8"(i8* inreg null, i8* inreg null)
// X86: call x86_vectorcallcc void @"\01foo_vector@@8"(i8* inreg null, i8* inreg null)
// X86: ret void
// X64-LABEL: define dso_local void @bar()
// X64: call void @foo_default(i8* null, i8* null)
// X64: call void @foo_std(i8* null, i8* null)
// X64: call void @foo_fast(i8* null, i8* null)
// X64: call x86_vectorcallcc void @"\01foo_vector@@16"(i8* null, i8* null)
// X64: ret void
// X86-VEC-LABEL: define dso_local void @bar()
// X86-VEC: call x86_vectorcallcc void @"\01foo_default@@8"(i8* inreg null, i8* inreg null)
// X86-VEC: call x86_stdcallcc void @"\01_foo_std@8"(i8* null, i8* null)
// X86-VEC: call x86_fastcallcc void @"\01@foo_fast@8"(i8* inreg null, i8* inreg null)
// X86-VEC: call x86_vectorcallcc void @"\01foo_vector@@8"(i8* inreg null, i8* inreg null)
// X86-VEC: ret void
// X64-VEC-LABEL: define dso_local void @bar()
// X64-VEC: call x86_vectorcallcc void @"\01foo_default@@16"(i8* null, i8* null)
// X64-VEC: call void @foo_std(i8* null, i8* null)
// X64-VEC: call void @foo_fast(i8* null, i8* null)
// X64-VEC: call x86_vectorcallcc void @"\01foo_vector@@16"(i8* null, i8* null)
// X64-VEC: ret void