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#include <math.h>
#include <errno.h>
#include <limits.h>
#include <math_private.h>
#include <fenv.h>
#if _GL_HAS_BUILTIN_ILOGB
int
M_DECL_FUNC (__ilogb) (FLOAT x)
{
int r;
/* Check for exceptional cases. */
if (! M_SUF(__builtin_test_dc_ilogb) (x, 0x7f))
r = M_SUF (__builtin_ilogb) (x);
else
/* Fallback to the generic ilogb if x is NaN, Inf or subnormal. */
r = M_SUF (__ieee754_ilogb) (x);
if (__builtin_expect (r == FP_ILOGB0, 0)
|| __builtin_expect (r == FP_ILOGBNAN, 0)
|| __builtin_expect (r == INT_MAX, 0))
{
__set_errno (EDOM);
__feraiseexcept (FE_INVALID);
}
return r;
}
declare_mgen_alias (__ilogb, ilogb)
#else
#include <math/w_ilogb_template.c>
#endif
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