sysdeps/powerpc/powerpc64/le/fpu/w_llogb_template.c

   1 #include <math.h>
   2 #include <errno.h>
   3 #include <limits.h>
   4 #include <math_private.h>
   5 #include <fenv.h>
   6
   7 #if _GL_HAS_BUILTIN_ILOGB
   8 long int
   9 M_DECL_FUNC (__llogb) (FLOAT x)
  10 {
  11   int r;
  12   /* Check for exceptional cases.  */
  13   if (! M_SUF(__builtin_test_dc_ilogb) (x, 0x7f))
  14     r = M_SUF (__builtin_ilogb) (x);
  15   else
  16     /* Fallback to the generic ilogb if x is NaN, Inf or subnormal.  */
  17     r = M_SUF (__ieee754_ilogb) (x);
  18   long int lr = r;
  19   if (__glibc_unlikely (r == FP_ILOGB0)
  20       || __glibc_unlikely (r == FP_ILOGBNAN)
  21       || __glibc_unlikely (r == INT_MAX))
  22     {
  23 #if LONG_MAX != INT_MAX
  24       if (r == FP_ILOGB0)
  25         lr = FP_LLOGB0;
  26       else if (r == FP_ILOGBNAN)
  27         lr = FP_LLOGBNAN;
  28       else
  29         lr = LONG_MAX;
  30 #endif
  31       __set_errno (EDOM);
  32       __feraiseexcept (FE_INVALID);
  33     }
  34   return lr;
  35 }
  36 declare_mgen_alias (__llogb, llogb)
  37 #else
  38 #include <math/w_llogb_template.c>
  39 #endif