32 lines
944 B
Common Lisp
32 lines
944 B
Common Lisp
#include <clc/clc.h>
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#include "math.h"
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#include "../clcmacro.h"
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_CLC_OVERLOAD _CLC_DEF float logb(float x) {
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int ax = as_int(x) & EXSIGNBIT_SP32;
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float s = -118 - clz(ax);
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float r = (ax >> EXPSHIFTBITS_SP32) - EXPBIAS_SP32;
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r = ax >= PINFBITPATT_SP32 ? as_float(ax) : r;
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r = ax < 0x00800000 ? s : r;
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r = ax == 0 ? as_float(NINFBITPATT_SP32) : r;
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return r;
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}
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_CLC_UNARY_VECTORIZE(_CLC_OVERLOAD _CLC_DEF, float, logb, float);
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#ifdef cl_khr_fp64
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#pragma OPENCL EXTENSION cl_khr_fp64 : enable
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_CLC_OVERLOAD _CLC_DEF double logb(double x) {
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long ax = as_long(x) & EXSIGNBIT_DP64;
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double s = -1011L - clz(ax);
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double r = (int) (ax >> EXPSHIFTBITS_DP64) - EXPBIAS_DP64;
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r = ax >= PINFBITPATT_DP64 ? as_double(ax) : r;
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r = ax < 0x0010000000000000L ? s : r;
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r = ax == 0L ? as_double(NINFBITPATT_DP64) : r;
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return r;
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}
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_CLC_UNARY_VECTORIZE(_CLC_OVERLOAD _CLC_DEF, double, logb, double)
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#endif
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