1  #include <string.h>
       2  #include <stdlib.h>
       3  #include <float.h>
       4  
       5  #define fpsizeoff	sizeof(float)
       6  #define fpsizeof	sizeof(double)
       7  #define fpsizeofl	sizeof(long double)
       8  
       9  /* Work around the fact that with the Intel double-extended precision,
      10     we've got a 10 byte type stuffed into some amount of padding.  And
      11     the fact that -ffloat-store is going to stuff this value temporarily
      12     into some bit of stack frame that we've no control over and can't zero.  */
      13  #if LDBL_MANT_DIG == 64
      14  # if defined(__i386__) || defined(__x86_64__) || defined (__ia64__)
      15  #  undef fpsizeofl
      16  #  define fpsizeofl	10
      17  # endif
      18  #endif
      19  
      20  /* Work around the fact that the sign of the second double in the IBM
      21     double-double format is not strictly specified when it contains a zero.
      22     For instance, -0.0L can be represented with either (-0.0, +0.0) or
      23     (-0.0, -0.0).  The former is what we'll get from the compiler when it
      24     builds constants; the later is what we'll get from the negation operator
      25     at runtime.  */
      26  /* ??? This hack only works for big-endian, which is fortunately true for
      27     AIX and, Darwin.  */
      28  #if LDBL_MANT_DIG == 106
      29  # undef fpsizeofl
      30  # define fpsizeofl	sizeof(double)
      31  #endif
      32  
      33  
      34  #define TEST(TYPE, EXT)						\
      35  TYPE c##EXT (TYPE x, TYPE y)					\
      36  {								\
      37    return __builtin_copysign##EXT (x, y);			\
      38  }								\
      39  								\
      40  struct D##EXT { TYPE x, y, z; };				\
      41  								\
      42  static const struct D##EXT T##EXT[] = {				\
      43    { 1.0, 2.0, 1.0 },						\
      44    { 1.0, -2.0, -1.0 },						\
      45    { -1.0, -2.0, -1.0 },						\
      46    { 0.0, -2.0, -0.0 },						\
      47    { -0.0, -2.0, -0.0 },						\
      48    { -0.0, 2.0, 0.0 },						\
      49    { __builtin_inf##EXT (), -0.0, -__builtin_inf##EXT () },	\
      50    { -__builtin_nan##EXT (""), __builtin_inf##EXT (),		\
      51      __builtin_nan##EXT ("") }					\
      52  };								\
      53  								\
      54  void test##EXT (void)						\
      55  {								\
      56    int i, n = sizeof (T##EXT) / sizeof (T##EXT[0]);		\
      57    TYPE r;							\
      58    for (i = 0; i < n; ++i)					\
      59      {								\
      60        r = c##EXT (T##EXT[i].x, T##EXT[i].y);			\
      61        if (memcmp (&r, &T##EXT[i].z, fpsizeof##EXT) != 0)	\
      62  	abort ();						\
      63      }								\
      64  }
      65  
      66  TEST(float, f)
      67  TEST(double, )
      68  TEST(long double, l)
      69  
      70  int main()
      71  {
      72    testf();
      73    test();
      74    testl();
      75    return 0;
      76  }