blob: d00b71d2a34e28da2742a2788c49f4b442c472ef (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
|
#include <math.h>
#include <errno.h>
#include <limits.h>
#include <math_private.h>
#include <fenv.h>
#if _GL_HAS_BUILTIN_ILOGB
long int
M_DECL_FUNC (__llogb) (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);
long int lr = r;
if (__glibc_unlikely (r == FP_ILOGB0)
|| __glibc_unlikely (r == FP_ILOGBNAN)
|| __glibc_unlikely (r == INT_MAX))
{
#if LONG_MAX != INT_MAX
if (r == FP_ILOGB0)
lr = FP_LLOGB0;
else if (r == FP_ILOGBNAN)
lr = FP_LLOGBNAN;
else
lr = LONG_MAX;
#endif
__set_errno (EDOM);
__feraiseexcept (FE_INVALID);
}
return lr;
}
declare_mgen_alias (__llogb, llogb)
#else
#include <math/w_llogb_template.c>
#endif
|
