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musl
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math
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__fpclassifyf.c
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#include
<math.h>
#include
<stdint.h>
int
__fpclassifyf
(
float
x
)
{
union
{
float
f
;
uint32_t
i
;}
u
=
{
x
};
int
e
=
u
.
i
>>
23
&
0xff
;
if
(!
e
)
return
u
.
i
<<
1
?
FP_SUBNORMAL
:
FP_ZERO
;
if
(
e
==
0xff
)
return
u
.
i
<<
9
?
FP_NAN
:
FP_INFINITE
;
return
FP_NORMAL
;
}