42 lines
784 B
C
42 lines
784 B
C
|
#include "math.h"
|
||
|
|
|
||
|
|
#include "math_private.h"
|
||
|
|
|
||
|
|
static const float huge = 1.0e30;
|
||
|
|
|
||
|
|
float ceilf(float x)
|
||
|
|
{
|
||
|
|
int32_t i0, j0;
|
||
|
|
u_int32_t i;
|
||
|
|
|
||
|
|
GET_FLOAT_WORD(i0, x);
|
||
|
|
j0 = ((i0 >> 23) & 0xff) - 0x7f;
|
||
|
|
if (j0 < 23) {
|
||
|
|
if (j0 < 0) { /* raise inexact if x != 0 */
|
||
|
|
if (huge + x > (float)0.0) { /* return 0*sign(x) if |x|<1 */
|
||
|
|
if (i0 < 0) {
|
||
|
|
i0 = 0x80000000;
|
||
|
|
} else if (i0 != 0) {
|
||
|
|
i0 = 0x3f800000;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
i = (0x007fffff) >> j0;
|
||
|
|
if ((i0 & i) == 0)
|
||
|
|
return x; /* x is integral */
|
||
|
|
if (huge + x > (float)0.0) { /* raise inexact flag */
|
||
|
|
if (i0 > 0)
|
||
|
|
i0 += (0x00800000) >> j0;
|
||
|
|
i0 &= (~i);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
if (j0 == 0x80)
|
||
|
|
return x + x; /* inf or NaN */
|
||
|
|
else
|
||
|
|
return x; /* x is integral */
|
||
|
|
}
|
||
|
|
SET_FLOAT_WORD(x, i0);
|
||
|
|
return x;
|
||
|
|
}
|