7e6a73959a
Increase fp16 support to allow clspv to continue to be OpenCL compliant following the update of the OpenCL-CTS adding more testing on math functions and conversions with half. Math functions are implemented by upscaling to fp32 and using the fp32 implementation. It garantees the accuracy required for half-precision float-point by the CTS.
34 lines
982 B
Common Lisp
34 lines
982 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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_CLC_DEFINE_UNARY_BUILTIN_FP16(logb)
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