blob: feff8a8b86d972dd432a1bd511ca2654702e5158 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
|
#ifndef _SQRT_DATA_H
#define _SQRT_DATA_H
#include <stdint.h> // for uint16_t
#define hidden __attribute__((visibility("hidden")))
/* if x in [1,2): i = (int)(64*x);
if x in [2,4): i = (int)(32*x-64);
__rsqrt_tab[i]*2^-16 is estimating 1/sqrt(x) with small relative error:
|__rsqrt_tab[i]*0x1p-16*sqrt(x) - 1| < -0x1.fdp-9 < 2^-8 */
extern hidden const uint16_t __rsqrt_tab[128];
#endif
|
