src/third_party/llvm-project/clang/test/Sema/attr-cpuspecific.c

// RUN: %clang_cc1 -triple x86_64-linux-gnu  -fsyntax-only -verify %s

void __attribute__((cpu_specific(ivybridge))) no_default(void);
void __attribute__((cpu_specific(sandybridge)))  no_default(void);

void use1(void){
  // Should be OK, default not a problem.
  no_default();
}

int __attribute__((cpu_specific(atom))) addr_of(void);
int __attribute__((cpu_specific(ivybridge)))  addr_of(void);
int __attribute__((cpu_specific(ivybridge)))  addr_of2(void);

void use2(void){
  addr_of();
  addr_of2();
  // expected-error@+1{{reference to multiversioned function could not be resolved; did you mean to call it with no arguments?}}
  (void)+addr_of;
  // expected-error@+1{{reference to multiversioned function could not be resolved; did you mean to call it with no arguments?}}
  (void)+addr_of2;
  // expected-error@+1{{reference to multiversioned function could not be resolved; did you mean to call it with no arguments?}}
  (void)&addr_of;
  // expected-error@+1{{reference to multiversioned function could not be resolved; did you mean to call it with no arguments?}}
  (void)&addr_of2;
}

// expected-error@+1 {{multiversioned function must have a prototype}}
int __attribute__((cpu_specific(atom))) no_proto();

int __attribute__((cpu_specific(atom))) redecl1(void);
int __attribute__((cpu_specific(atom))) redecl1(void) { return 1; }

int __attribute__((cpu_dispatch(atom))) redecl2(void);
int __attribute__((cpu_dispatch(atom))) redecl2(void) { }
// expected-error@+2 {{redefinition of 'redecl2'}}
// expected-note@-2 {{previous definition is here}}
int __attribute__((cpu_dispatch(atom))) redecl2(void) { }

int redecl3(void);
// expected-error@-1 {{function declaration is missing 'cpu_specific' or 'cpu_dispatch' attribute in a multiversioned function}}
// expected-note@+1 {{function multiversioning caused by this declaration}}
int __attribute__((cpu_dispatch(atom))) redecl3(void) {}

int __attribute__((cpu_specific(atom))) redecl4(void);
// expected-error@+1 {{function declaration is missing 'cpu_specific' or 'cpu_dispatch' attribute in a multiversioned function}}
int redecl4(void);

// expected-warning@+1 {{CPU list contains duplicate entries; attribute ignored}}
int __attribute__((cpu_specific(atom, atom))) dup_procs(void);

int __attribute__((cpu_specific(ivybridge, atom))) dup_procs2(void);
// expected-error@+2 {{multiple 'cpu_specific' functions cannot specify the same CPU: 'atom'}}
// expected-note@-2 {{previous declaration is here}}
int __attribute__((cpu_specific(atom))) dup_procs2(void);

int __attribute__((cpu_specific(ivybridge, atom))) dup_procs3(void);
// expected-error@+2 {{multiple 'cpu_specific' functions cannot specify the same CPU: 'ivybridge'}}
// expected-note@-2 {{previous declaration is here}}
int __attribute__((cpu_specific(atom, ivybridge))) dup_procs3(void);

int __attribute__((cpu_specific(atom))) redef(void) { return 1; }
// expected-error@+2 {{redefinition of 'redef'}}
// expected-note@-2 {{previous definition is here}}
int __attribute__((cpu_specific(atom))) redef(void) { return 2; }

int __attribute((cpu_dispatch(atom))) mult_dispatch(void) {}
// expected-error@+2 {{'cpu_dispatch' function redeclared with different CPUs}}
// expected-note@-2 {{previous declaration is here}}
int __attribute((cpu_dispatch(ivybridge))) mult_dispatch(void) {}

// expected-error@+1 {{'cpu_dispatch' attribute takes at least 1 argument}}
int __attribute((cpu_dispatch())) no_dispatch(void) {}
// expected-error@+1 {{'cpu_specific' attribute takes at least 1 argument}}
int __attribute((cpu_specific())) no_specific(void) {}

//expected-error@+1 {{attribute 'cpu_specific' multiversioning cannot be combined}}
void __attribute__((used,cpu_specific(sandybridge)))  addtl_attrs(void);

void __attribute__((target("default"))) addtl_attrs2(void);
// expected-error@+2 {{multiversioning attributes cannot be combined}}
// expected-note@-2 {{previous declaration is here}}
void __attribute__((cpu_specific(sandybridge))) addtl_attrs2(void);

// expected-error@+2 {{multiversioning attributes cannot be combined}}
void __attribute((cpu_specific(sandybridge), cpu_dispatch(atom, sandybridge)))
combine_attrs(void);

int __attribute__((cpu_dispatch(ivybridge))) diff_cc(void){}
// expected-error@+1 {{multiversioned function declaration has a different calling convention}}
__vectorcall int __attribute__((cpu_specific(sandybridge))) diff_cc(void);

// expected-warning@+2 {{body of cpu_dispatch function will be ignored}}
int __attribute__((cpu_dispatch(atom))) disp_with_body(void) {
  return 5;
}