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avx512_mathfun.h
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avx512_mathfun.h
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/*
* Project : SIMD_Utils
* Version : 0.2.5
* Author : JishinMaster
* Licence : BSD-2
*/
/*
AVX implementation of sin, cos, sincos, exp and log
Based on "sse_mathfun.h", by Julien Pommier
and "avx_mathfun.h" by Giovanni Garberoglio
http://gruntthepeon.free.fr/ssemath/
*/
#include <immintrin.h>
/* natural logarithm computed for 8 simultaneous float
return NaN for x <= 0
*/
static inline v16sf log512_ps(v16sf x)
{
v16sf invalid_mask = (v16sf) _mm512_movm_epi32(_mm512_cmp_ps_mask(x, _mm512_setzero_ps(), _CMP_LE_OS));
x = _mm512_max_ps(x, *(v16sf *) _ps512_min_norm_pos); /* cut off denormalized stuff */
/* get the exponent part */
v16sf e = _mm512_getexp_ps(x);
/* keep only the fractional part */
x = _mm512_and_ps(x, *(v16sf *) _ps512_inv_mant_mask);
x = _mm512_or_ps(x, *(v16sf *) _ps512_0p5);
__mmask16 kmask = _mm512_cmp_ps_mask(x, *(v16sf *) _ps512_cephes_SQRTHF, _CMP_LT_OS);
v16sf tmp = x;
x = _mm512_sub_ps(x, *(v16sf *) _ps512_1);
#if 1
//instead of doing add 1 then sub 1, dot add 1 on condition, should be faster
__mmask16 knotmask = _knot_mask16(kmask);
e = _mm512_mask_add_ps(e, knotmask, e, *(v16sf *) _ps512_1);
#else
e = _mm512_add_ps(e, *(v16sf *) _ps512_1);
e = _mm512_mask_sub_ps(e, kmask, e, *(v16sf *) _ps512_1);
#endif
x = _mm512_mask_add_ps(x, kmask, x, tmp);
v16sf z = _mm512_mul_ps(x, x);
v16sf y = _mm512_fmadd_ps(*(v16sf *) _ps512_cephes_log_p0, x, *(v16sf *) _ps512_cephes_log_p1);
y = _mm512_fmadd_ps(y, x, *(v16sf *) _ps512_cephes_log_p2);
y = _mm512_fmadd_ps(y, x, *(v16sf *) _ps512_cephes_log_p3);
y = _mm512_fmadd_ps(y, x, *(v16sf *) _ps512_cephes_log_p4);
y = _mm512_fmadd_ps(y, x, *(v16sf *) _ps512_cephes_log_p5);
y = _mm512_fmadd_ps(y, x, *(v16sf *) _ps512_cephes_log_p6);
y = _mm512_fmadd_ps(y, x, *(v16sf *) _ps512_cephes_log_p7);
y = _mm512_fmadd_ps(y, x, *(v16sf *) _ps512_cephes_log_p8);
y = _mm512_mul_ps(y, x);
y = _mm512_mul_ps(y, z);
y = _mm512_fmadd_ps(e, *(v16sf *) _ps512_cephes_log_q1, y);
y = _mm512_fnmadd_ps(z, *(v16sf *) _ps512_0p5, y);
tmp = _mm512_fmadd_ps(e, *(v16sf *) _ps512_cephes_log_q2, y);
x = _mm512_add_ps(x, tmp);
x = _mm512_or_ps(x, invalid_mask); // negative arg will be NAN
return x;
}
static inline v16sf exp512_ps(v16sf x)
{
v16sf tmp, fx;
v16si imm0;
x = _mm512_min_ps(x, *(v16sf *) _ps512_exp_hi);
x = _mm512_max_ps(x, *(v16sf *) _ps512_exp_lo);
/* Express e**x = e**g 2**n
* = e**g e**( n loge(2) )
* = e**( g + n loge(2) )
*/
fx = _mm512_fmadd_ps(x, *(v16sf *) _ps512_cephes_LOG2EF, *(v16sf *) _ps512_0p5);
fx = _mm512_floor_ps(fx);
x = _mm512_fnmadd_ps(fx, *(v16sf *) _ps512_cephes_exp_C1, x);
x = _mm512_fnmadd_ps(fx, *(v16sf *) _ps512_cephes_exp_C2, x);
v16sf z = _mm512_mul_ps(x, x);
v16sf y = _mm512_fmadd_ps(*(v16sf *) _ps512_cephes_exp_p0, x, *(v16sf *) _ps512_cephes_exp_p1);
y = _mm512_fmadd_ps(y, x, *(v16sf *) _ps512_cephes_exp_p2);
y = _mm512_fmadd_ps(y, x, *(v16sf *) _ps512_cephes_exp_p3);
y = _mm512_fmadd_ps(y, x, *(v16sf *) _ps512_cephes_exp_p4);
y = _mm512_fmadd_ps(y, x, *(v16sf *) _ps512_cephes_exp_p5);
y = _mm512_fmadd_ps(y, z, x);
y = _mm512_add_ps(y, *(v16sf *) _ps512_1);
/* build 2^n */
y = _mm512_scalef_ps(y, fx);
return y;
}
static inline v16sf sin512_ps(v16sf x)
{ // any x
v16sf sign_bit, y;
v16si imm0, imm2;
sign_bit = x;
/* take the absolute value */
x = _mm512_and_ps(x, *(v16sf *) _ps512_inv_sign_mask);
/* extract the sign bit (upper one) */
sign_bit = _mm512_and_ps(sign_bit, *(v16sf *) _ps512_sign_mask);
/* scale by 4/Pi */
y = _mm512_mul_ps(x, *(v16sf *) _ps512_cephes_FOPI);
/* store the integer part of y in mm0 */
imm2 = _mm512_cvttps_epi32(y);
/* j=(j+1) & (~1) (see the cephes sources) */
// another two AVX512 instructions
imm2 = _mm512_add_epi32(imm2, *(v16si *) _pi32_512_1);
imm2 = _mm512_and_si512(imm2, *(v16si *) _pi32_512_inv1);
y = _mm512_cvtepi32_ps(imm2);
/* get the swap sign flag */
imm0 = _mm512_and_si512(imm2, *(v16si *) _pi32_512_4);
imm0 = _mm512_slli_epi32(imm0, 29);
/* get the polynom selection mask
there is one polynom for 0 <= x <= Pi/4
and another one for Pi/4<x<=Pi/2
Both branches will be computed.
*/
imm2 = _mm512_and_si512(imm2, *(v16si *) _pi32_512_2);
v16sf swap_sign_bit = _mm512_castsi512_ps(imm0);
__mmask16 poly_mask = _mm512_cmpeq_epi32_mask(imm2, *(v16si *) _pi32_512_0);
sign_bit = _mm512_xor_ps(sign_bit, swap_sign_bit);
/* The magic pass: "Extended precision modular arithmetic"
x = ((x - y * DP1) - y * DP2) - y * DP3; */
x = _mm512_fmadd_ps(y, *(v16sf *) _ps512_minus_cephes_DP1, x);
x = _mm512_fmadd_ps(y, *(v16sf *) _ps512_minus_cephes_DP2, x);
x = _mm512_fmadd_ps(y, *(v16sf *) _ps512_minus_cephes_DP3, x);
/* Evaluate the first polynom (0 <= x <= Pi/4) */
v16sf z = _mm512_mul_ps(x, x);
y = _mm512_fmadd_ps(*(v16sf *) _ps512_coscof_p0, z, *(v16sf *) _ps512_coscof_p1);
y = _mm512_fmadd_ps(y, z, *(v16sf *) _ps512_coscof_p2);
y = _mm512_mul_ps(y, z);
y = _mm512_mul_ps(y, z);
y = _mm512_fnmadd_ps(z, *(v16sf *) _ps512_0p5, y);
y = _mm512_add_ps(y, *(v16sf *) _ps512_1);
/* Evaluate the second polynom (Pi/4 <= x <= 0) */
v16sf y2 = _mm512_fmadd_ps(*(v16sf *) _ps512_sincof_p0, z, *(v16sf *) _ps512_sincof_p1);
y2 = _mm512_fmadd_ps(y2, z, *(v16sf *) _ps512_sincof_p2);
y2 = _mm512_mul_ps(y2, z);
y2 = _mm512_fmadd_ps(y2, x, x);
/* select the correct result from the two polynoms */
y = _mm512_mask_blend_ps(poly_mask, y, y2);
/* update the sign */
y = _mm512_xor_ps(y, sign_bit);
return y;
}
/* almost the same as sin_ps */
static inline v16sf cos512_ps(v16sf x)
{ // any x
v16sf y;
v16si imm0, imm2;
/* take the absolute value */
x = _mm512_and_ps(x, *(v16sf *) _ps512_inv_sign_mask);
/* scale by 4/Pi */
y = _mm512_mul_ps(x, *(v16sf *) _ps512_cephes_FOPI);
/* store the integer part of y in mm0 */
imm2 = _mm512_cvttps_epi32(y);
/* j=(j+1) & (~1) (see the cephes sources) */
imm2 = _mm512_add_epi32(imm2, *(v16si *) _pi32_512_1);
imm2 = _mm512_and_si512(imm2, *(v16si *) _pi32_512_inv1);
y = _mm512_cvtepi32_ps(imm2);
imm2 = _mm512_sub_epi32(imm2, *(v16si *) _pi32_512_2);
/* get the swap sign flag */
imm0 = _mm512_andnot_si512(imm2, *(v16si *) _pi32_512_4);
imm0 = _mm512_slli_epi32(imm0, 29);
/* get the polynom selection mask */
imm2 = _mm512_and_si512(imm2, *(v16si *) _pi32_512_2);
v16sf sign_bit = _mm512_castsi512_ps(imm0);
__mmask16 poly_mask = _mm512_cmpeq_epi32_mask(imm2, *(v16si *) _pi32_512_0);
/* The magic pass: "Extended precision modular arithmetic"
x = ((x - y * DP1) - y * DP2) - y * DP3; */
x = _mm512_fmadd_ps(y, *(v16sf *) _ps512_minus_cephes_DP1, x);
x = _mm512_fmadd_ps(y, *(v16sf *) _ps512_minus_cephes_DP2, x);
x = _mm512_fmadd_ps(y, *(v16sf *) _ps512_minus_cephes_DP3, x);
/* Evaluate the first polynom (0 <= x <= Pi/4) */
v16sf z = _mm512_mul_ps(x, x);
y = _mm512_fmadd_ps(*(v16sf *) _ps512_coscof_p0, z, *(v16sf *) _ps512_coscof_p1);
y = _mm512_fmadd_ps(y, z, *(v16sf *) _ps512_coscof_p2);
y = _mm512_mul_ps(y, z);
y = _mm512_mul_ps(y, z);
y = _mm512_fnmadd_ps(z, *(v16sf *) _ps512_0p5, y);
y = _mm512_add_ps(y, *(v16sf *) _ps512_1);
/* Evaluate the second polynom (Pi/4 <= x <= 0) */
v16sf y2 = _mm512_fmadd_ps(*(v16sf *) _ps512_sincof_p0, z, *(v16sf *) _ps512_sincof_p1);
y2 = _mm512_fmadd_ps(y2, z, *(v16sf *) _ps512_sincof_p2);
y2 = _mm512_mul_ps(y2, z);
y2 = _mm512_fmadd_ps(y2, x, x);
/* select the correct result from the two polynoms */
y = _mm512_mask_blend_ps(poly_mask, y, y2);
/* update the sign */
y = _mm512_xor_ps(y, sign_bit);
return y;
}
static inline void sincos512_ps(v16sf x, v16sf *s, v16sf *c)
{
v16sf xmm1, xmm2, sign_bit_sin, y;
v16si imm0, imm2, imm4;
sign_bit_sin = x;
/* take the absolute value */
x = _mm512_and_ps(x, *(v16sf *) _ps512_inv_sign_mask);
/* extract the sign bit (upper one) */
sign_bit_sin = _mm512_and_ps(sign_bit_sin, *(v16sf *) _ps512_sign_mask);
/* scale by 4/Pi */
y = _mm512_mul_ps(x, *(v16sf *) _ps512_cephes_FOPI);
/* store the integer part of y in imm2 */
imm2 = _mm512_cvttps_epi32(y);
/* j=(j+1) & (~1) (see the cephes sources) */
imm2 = _mm512_add_epi32(imm2, *(v16si *) _pi32_512_1);
imm2 = _mm512_and_si512(imm2, *(v16si *) _pi32_512_inv1);
y = _mm512_cvtepi32_ps(imm2);
imm4 = imm2;
/* get the swap sign flag for the sine */
imm0 = _mm512_and_si512(imm2, *(v16si *) _pi32_512_4);
imm0 = _mm512_slli_epi32(imm0, 29);
// v16sf swap_sign_bit_sin = _mm512_castsi512_ps(imm0);
/* get the polynom selection mask for the sine*/
imm2 = _mm512_and_si512(imm2, *(v16si *) _pi32_512_2);
v16sf swap_sign_bit_sin = _mm512_castsi512_ps(imm0);
__mmask16 poly_mask = _mm512_cmpeq_epi32_mask(imm2, *(v16si *) _pi32_512_0);
/* The magic pass: "Extended precision modular arithmetic"
x = ((x - y * DP1) - y * DP2) - y * DP3; */
x = _mm512_fmadd_ps(y, *(v16sf *) _ps512_minus_cephes_DP1, x);
x = _mm512_fmadd_ps(y, *(v16sf *) _ps512_minus_cephes_DP2, x);
x = _mm512_fmadd_ps(y, *(v16sf *) _ps512_minus_cephes_DP3, x);
imm4 = _mm512_sub_epi32(imm4, *(v16si *) _pi32_512_2);
imm4 = _mm512_andnot_si512(imm4, *(v16si *) _pi32_512_4);
imm4 = _mm512_slli_epi32(imm4, 29);
v16sf sign_bit_cos = _mm512_castsi512_ps(imm4);
sign_bit_sin = _mm512_xor_ps(sign_bit_sin, swap_sign_bit_sin);
/* Evaluate the first polynom (0 <= x <= Pi/4) */
v16sf z = _mm512_mul_ps(x, x);
y = _mm512_fmadd_ps(*(v16sf *) _ps512_coscof_p0, z, *(v16sf *) _ps512_coscof_p1);
y = _mm512_fmadd_ps(y, z, *(v16sf *) _ps512_coscof_p2);
y = _mm512_mul_ps(y, z);
y = _mm512_mul_ps(y, z);
y = _mm512_fnmadd_ps(z, *(v16sf *) _ps512_0p5, y);
y = _mm512_add_ps(y, *(v16sf *) _ps512_1);
/* Evaluate the second polynom (Pi/4 <= x <= 0) */
v16sf y2 = _mm512_fmadd_ps(*(v16sf *) _ps512_sincof_p0, z, *(v16sf *) _ps512_sincof_p1);
y2 = _mm512_fmadd_ps(y2, z, *(v16sf *) _ps512_sincof_p2);
y2 = _mm512_mul_ps(y2, z);
y2 = _mm512_fmadd_ps(y2, x, x);
/* select the correct result from the two polynoms */
xmm1 = _mm512_mask_blend_ps(poly_mask, y, y2);
xmm2 = _mm512_mask_blend_ps(poly_mask, y2, y);
/* update the sign */
*s = _mm512_xor_ps(xmm1, sign_bit_sin);
*c = _mm512_xor_ps(xmm2, sign_bit_cos);
}