1#include <clc/clc.h>
2#include "math.h"
3#include "../clcmacro.h"
4
5_CLC_OVERLOAD _CLC_DEF float logb(float x) {
6    int ax = as_int(x) & EXSIGNBIT_SP32;
7    float s = -118 - clz(ax);
8    float r = (ax >> EXPSHIFTBITS_SP32) - EXPBIAS_SP32;
9    r = ax >= PINFBITPATT_SP32 ? as_float(ax) : r;
10    r = ax < 0x00800000 ? s : r;
11    r = ax == 0 ? as_float(NINFBITPATT_SP32) : r;
12    return r;
13}
14
15_CLC_UNARY_VECTORIZE(_CLC_OVERLOAD _CLC_DEF, float, logb, float);
16
17#ifdef cl_khr_fp64
18#pragma OPENCL EXTENSION cl_khr_fp64 : enable
19
20_CLC_OVERLOAD _CLC_DEF double logb(double x) {
21    long ax = as_long(x) & EXSIGNBIT_DP64;
22    double s = -1011L - clz(ax);
23    double r = (int) (ax >> EXPSHIFTBITS_DP64) - EXPBIAS_DP64;
24    r = ax >= PINFBITPATT_DP64 ? as_double(ax) : r;
25    r = ax < 0x0010000000000000L ? s : r;
26    r = ax == 0L ? as_double(NINFBITPATT_DP64) : r;
27    return r;
28}
29
30_CLC_UNARY_VECTORIZE(_CLC_OVERLOAD _CLC_DEF, double, logb, double)
31#endif
32