blob: 9e34c7c9568b362a45e69b249cd59cbcacec2e71 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
|
#include <fenv.h>
#include <math.h>
#include <errno.h>
#define FE_ROUNDING_MASK \
(FE_TONEAREST | FE_DOWNWARD | FE_UPWARD | FE_TOWARDZERO)
float
modff (float value, float* iptr)
{
float int_part;
unsigned short saved_cw;
/* truncate */
asm ("fnstcw %0;" : "=m" (saved_cw)); /* save control word */
asm ("fldcw %0;" : : "m" ((saved_cw & ~FE_ROUNDING_MASK)
| FE_TOWARDZERO));
asm ("frndint;" : "=t" (int_part) : "0" (value)); /* round */
asm ("fldcw %0;" : : "m" (saved_cw)); /* restore saved cw */
if (iptr)
*iptr = int_part;
return (isinf (value) ? 0.0F : value - int_part);
}
|