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/*========================== begin_copyright_notice ============================
Copyright (C) 2024 Intel Corporation
SPDX-License-Identifier: MIT
============================= end_copyright_notice ===========================*/
#include "../imf.h"
#pragma OPENCL FP_CONTRACT OFF
static __constant union {
unsigned long w;
unsigned int w32[2];
int s32[2];
double f;
} __dln_ep___c9 = {0xbfc11e70a5c9b8f8uL};
static __constant union {
unsigned long w;
unsigned int w32[2];
int s32[2];
double f;
} __dln_ep___c8 = {0x3fc20827ee8835feuL};
static __constant union {
unsigned long w;
unsigned int w32[2];
int s32[2];
double f;
} __dln_ep___c7 = {0xbfbedf6494cc1f86uL};
static __constant union {
unsigned long w;
unsigned int w32[2];
int s32[2];
double f;
} __dln_ep___c6 = {0x3fc1e531c40397e0uL};
static __constant union {
unsigned long w;
unsigned int w32[2];
int s32[2];
double f;
} __dln_ep___c5 = {0xbfc55d72615e74d3uL};
static __constant union {
unsigned long w;
unsigned int w32[2];
int s32[2];
double f;
} __dln_ep___c4 = {0x3fc99dac1eadbf8euL};
static __constant union {
unsigned long w;
unsigned int w32[2];
int s32[2];
double f;
} __dln_ep___c3 = {0xbfcfffcff3489b95uL};
static __constant union {
unsigned long w;
unsigned int w32[2];
int s32[2];
double f;
} __dln_ep___c2 = {0x3fd5554dfa222c07uL};
static __constant union {
unsigned long w;
unsigned int w32[2];
int s32[2];
double f;
} __dln_ep___c1 = {0xbfe00000145aea06uL};
static __constant union {
unsigned long w;
unsigned int w32[2];
int s32[2];
double f;
} __dln_ep___c0 = {0x3e30eba0cce2e0b0uL};
__attribute__((always_inline)) inline int
__ocl_svml_internal_dln_ep(double *a, double *r) {
int nRet = 0;
union {
unsigned long w;
unsigned int w32[2];
int s32[2];
double f;
} x, expon, expon_r, one, l2;
double R, d_expon;
union {
unsigned long w;
unsigned int w32[2];
int s32[2];
double f;
} denorm_scale;
double poly, res;
union {
unsigned long w;
unsigned int w32[2];
int s32[2];
double f;
} _res;
int denorm_scale_exp;
x.f = *a;
// special branch for +/-0, negatives, +INFs, +NaNs
if ((x.w == 0x0uL) || (x.w >= 0x7ff0000000000000uL)) {
// x = +/-0
if ((x.w & 0x7fffffffffffffff) == 0x0uL) {
nRet = 2;
_res.w = 0xfff0000000000000uL;
*r = _res.f;
return nRet;
}
// x = any negative
else if (x.w > 0x8000000000000000uL) {
nRet = 1;
_res.w = x.w | 0xfff8000000000000uL;
*r = _res.f;
return nRet;
}
// x = +NaN or +INF
else {
// x = +NaN
if (x.w > 0x7ff0000000000000uL) {
_res.f = x.f + x.f;
}
// x = +INF
else {
_res.w = x.w;
}
*r = _res.f;
return nRet;
} // x = +NaN or +INF
} // special branch for +/-0, negatives, +INFs, +NaNs
// scale denormals
denorm_scale.w = 0x43B0000000000000ull;
denorm_scale_exp = (x.w <= 0x000fffffffffffffuL) ? (60 + 0x3FF) : 0x3FF;
x.f = (x.w <= 0x000fffffffffffffuL) ? (x.f * denorm_scale.f) : x.f;
// argument reduction to (-1/3, 1/3)
// reduced exponent
expon.w = x.w + 0x000AAAAAAAAAAAAAull;
expon.w >>= 52;
expon_r.w = expon.w << 52;
// reduced mantissa
one.w = 0x3FF0000000000000ull;
x.w = (x.w + one.w) - expon_r.w;
// reduced argument: reduced_mantissa - 1.0
R = x.f - one.f;
// polynomial
poly = SPIRV_OCL_BUILTIN(fma, _f64_f64_f64, )(__dln_ep___c9.f, R,
__dln_ep___c8.f);
poly = SPIRV_OCL_BUILTIN(fma, _f64_f64_f64, )(poly, R, __dln_ep___c7.f);
poly = SPIRV_OCL_BUILTIN(fma, _f64_f64_f64, )(poly, R, __dln_ep___c6.f);
poly = SPIRV_OCL_BUILTIN(fma, _f64_f64_f64, )(poly, R, __dln_ep___c5.f);
poly = SPIRV_OCL_BUILTIN(fma, _f64_f64_f64, )(poly, R, __dln_ep___c4.f);
poly = SPIRV_OCL_BUILTIN(fma, _f64_f64_f64, )(poly, R, __dln_ep___c3.f);
poly = SPIRV_OCL_BUILTIN(fma, _f64_f64_f64, )(poly, R, __dln_ep___c2.f);
poly = SPIRV_OCL_BUILTIN(fma, _f64_f64_f64, )(poly, R, __dln_ep___c1.f);
poly = SPIRV_OCL_BUILTIN(fma, _f64_f64_f64, )(poly, R, __dln_ep___c0.f);
// prepare exponent
// scale back denormals
expon.s32[0] -= denorm_scale_exp;
// exponent
d_expon = (double)expon.s32[0];
// full polynomial = log(1+R)
poly = SPIRV_OCL_BUILTIN(fma, _f64_f64_f64, )(poly, R, R);
// result: reduced_exponent*log(2)+log(1+R)
l2.w = 0x3FE62E42FEFA39EFull;
res = SPIRV_OCL_BUILTIN(fma, _f64_f64_f64, )(d_expon, l2.f, poly);
*r = res;
return nRet;
}
double __ocl_svml_log_ep(double x) {
double r;
__ocl_svml_internal_dln_ep(&x, &r);
return r;
}
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