clang/test/CodeGen/memcpy-inline-builtin-mutliple-decl.c

   1 // RUN: %clang_cc1 -triple i686-w64-mingw32 -emit-llvm -disable-llvm-passes -o - %s | FileCheck %s
   2 //
   3 // Verifies that clang detects memcpy inline version and uses it instead of the builtin.
   4 // Checks that clang correctly walks through multiple forward declaration.
   5
   6 typedef unsigned int size_t;
   7
   8 void *memcpy(void *_Dst, const void *_Src, size_t _Size);
   9
  10 extern __inline__ __attribute__((__always_inline__, __gnu_inline__)) __attribute__((__artificial__))
  11 void *memcpy(void *__dst, const void *__src, size_t __n)
  12 {
  13   return __builtin___memcpy_chk(__dst, __src, __n, __builtin_object_size((__dst), ((0) > 0) && (2 > 1)));
  14 }
  15
  16 void *memcpy(void *_Dst, const void *_Src, size_t _Size);
  17
  18 char *a, *b;
  19 void func(void) {
  20     memcpy(a, b, 42);
  21 }
  22
  23 // CHECK-LABEL: define {{.*}} @func(
  24 // CHECK: call ptr @memcpy.inline
  25
  26 // CHECK-LABEL: declare {{.*}} @memcpy(
  27
  28 // CHECK-LABEL: define {{.*}} @memcpy.inline(
  29 // CHECK: call ptr @__memcpy_chk