text: /*
     AVX implementation of sin, cos, sincos, exp and log
  
     Based on "sse_mathfun.h", by Julien Pommier
     http://gruntthepeon.free.fr/ssemath/
  
     Copyright (C) 2012 Giovanni Garberoglio
     Interdisciplinary Laboratory for Computational Science (LISC)
     Fondazione Bruno Kessler and University of Trento
     via Sommarive, 18
     I-38123 Trento (Italy)
  
    This software is provided 'as-is', without any express or implied
    warranty.  In no event will the authors be held liable for any damages
    arising from the use of this software.
  
    Permission is granted to anyone to use this software for any purpose,
    including commercial applications, and to alter it and redistribute it
    freely, subject to the following restrictions:
  
    1. The origin of this software must not be misrepresented; you must not
       claim that you wrote the original software. If you use this software
       in a product, an acknowledgment in the product documentation would be
       appreciated but is not required.
    2. Altered source versions must be plainly marked as such, and must not be
       misrepresented as being the original software.
    3. This notice may not be removed or altered from any source distribution.
  
    (this is the zlib license)
  */
  
  #pragma once
  #include <immintrin.h>
  
  #ifdef _MSC_VER /* visual c++ */
  # define ALIGN32_BEG __declspec(align(32))
  # define ALIGN32_END
  #else /* gcc or icc */
  # define ALIGN32_BEG
  # define ALIGN32_END __attribute__((aligned(32)))
  #endif
  
  /* __m128 is ugly to write */
  typedef __m256  v8sf; // vector of 8 float (avx)
  typedef __m256i v8si; // vector of 8 int   (avx)
  typedef __m128i v4si; // vector of 8 int   (avx)
  
  #define _PI32AVX_CONST(Name, Val)                                            \
    static const ALIGN32_BEG int _pi32avx_##Name[4] ALIGN32_END = { Val, Val, Val, Val }
  
  _PI32AVX_CONST(1, 1);
  _PI32AVX_CONST(inv1, ~1);
  _PI32AVX_CONST(2, 2);
  _PI32AVX_CONST(4, 4);
  
  
  /* declare some AVX constants -- why can't I figure a better way to do that? */
  #define _PS256_CONST(Name, Val)                                            \
    static const ALIGN32_BEG float _ps256_##Name[8] ALIGN32_END = { Val, Val, Val, Val, Val, Val, Val, Val }
  #define _PI32_CONST256(Name, Val)                                            \
    static const ALIGN32_BEG int _pi32_256_##Name[8] ALIGN32_END = { Val, Val, Val, Val, Val, Val, Val, Val }
  #define _PS256_CONST_TYPE(Name, Type, Val)                                 \
    static const ALIGN32_BEG Type _ps256_##Name[8] ALIGN32_END = { Val, Val, Val, Val, Val, Val, Val, Val }
  
  _PS256_CONST(1  , 1.0f);
  _PS256_CONST(0p5, 0.5f);
  /* the smallest non denormalized float number */
  _PS256_CONST_TYPE(min_norm_pos, int, (int) 0x00800000);
  _PS256_CONST_TYPE(mant_mask, int, (int) 0x7f800000);
  _PS256_CONST_TYPE(inv_mant_mask, int, (int) ~0x7f800000);
  
  _PS256_CONST_TYPE(sign_mask, int, (int) 0x80000000);
  _PS256_CONST_TYPE(inv_sign_mask, int, (int) ~0x80000000);
  
  _PI32_CONST256(0, 0);
  _PI32_CONST256(1, 1);
  _PI32_CONST256(inv1, ~1);
  _PI32_CONST256(2, 2);
  _PI32_CONST256(4, 4);
  _PI32_CONST256(0x7f, 0x7f);
  
  _PS256_CONST(cephes_SQRTHF, 0.707106781186547524f);
  _PS256_CONST(cephes_log_p0, 7.0376836292E-2f);
  _PS256_CONST(cephes_log_p1, - 1.1514610310E-1f);
  _PS256_CONST(cephes_log_p2, 1.1676998740E-1f);
  _PS256_CONST(cephes_log_p3, - 1.2420140846E-1f);
  _PS256_CONST(cephes_log_p4, + 1.4249322787E-1f);
  _PS256_CONST(cephes_log_p5, - 1.6668057665E-1f);
  _PS256_CONST(cephes_log_p6, + 2.0000714765E-1f);
  _PS256_CONST(cephes_log_p7, - 2.4999993993E-1f);
  _PS256_CONST(cephes_log_p8, + 3.3333331174E-1f);
  _PS256_CONST(cephes_log_q1, -2.12194440e-4f);
  _PS256_CONST(cephes_log_q2, 0.693359375f);
  
  #ifndef __AVX2__
  
  typedef union imm_xmm_union {
    v8si imm;
    v4si xmm[2];
  } imm_xmm_union;
  
  #define COPY_IMM_TO_XMM(imm_, xmm0_, xmm1_) {    \
      ALIGN32_BEG imm_xmm_union u ALIGN32_END;  \
      u.imm = imm_;				   \
      xmm0_ = u.xmm[0];                            \
      xmm1_ = u.xmm[1];                            \
  }
  
  #define COPY_XMM_TO_IMM(xmm0_, xmm1_, imm_) {                       \
      ALIGN32_BEG imm_xmm_union u ALIGN32_END; \
      u.xmm[0]=xmm0_; u.xmm[1]=xmm1_; imm_ = u.imm; \
    }
  
  
  #define AVX2_BITOP_USING_SSE2(fn) \
  static inline v8si _mmREF_##fn(v8si x, int a) \
  { \
    /* use SSE2 instruction to perform the bitop AVX2 */ \
    v4si x1, x2; \
    v8si ret; \
    COPY_IMM_TO_XMM(x, x1, x2); \
    x1 = _mm_##fn(x1,a); \
    x2 = _mm_##fn(x2,a); \
    COPY_XMM_TO_IMM(x1, x2, ret); \
    return(ret); \
  }
  
  AVX2_BITOP_USING_SSE2(slli_epi32)
  AVX2_BITOP_USING_SSE2(srli_epi32)
  
  #define AVX2_INTOP_USING_SSE2(fn) \
  static inline v8si _mmREF_##fn(v8si x, v8si y) \
  { \
    /* use SSE2 instructions to perform the AVX2 integer operation */ \
    v4si x1, x2; \
    v4si y1, y2; \
    v8si ret; \
    COPY_IMM_TO_XMM(x, x1, x2); \
    COPY_IMM_TO_XMM(y, y1, y2); \
    x1 = _mm_##fn(x1,y1); \
    x2 = _mm_##fn(x2,y2); \
    COPY_XMM_TO_IMM(x1, x2, ret); \
    return(ret); \
  }
  
  AVX2_INTOP_USING_SSE2(sub_epi32)
  AVX2_INTOP_USING_SSE2(add_epi32)
  
  #else
  
  #define AVX2_BITOP_USING_AVX2(fn) \
  static inline v8si _mmREF_##fn(v8si x, int a) \
  { \
    return _mm256_##fn(x, a); \
  }
  AVX2_BITOP_USING_AVX2(slli_epi32)
  AVX2_BITOP_USING_AVX2(srli_epi32)
  
  #define AVX2_INTOP_USING_AVX2(fn) \
  static inline v8si _mmREF_##fn(v8si x, v8si y) \
  { \
    return _mm256_##fn(x, y); \
  }
  AVX2_INTOP_USING_AVX2(sub_epi32)
  AVX2_INTOP_USING_AVX2(add_epi32)
  
  #endif /* __AVX2__ */
  
  
  /*
   *	natural logarithm computed for 8 simultaneous float
   *  return NaN for x <= 0
   */
  inline v8sf log256_ps(v8sf x)
  {
    v8si imm0;
    v8sf one = *(v8sf*)_ps256_1;
  
    //v8sf invalid_mask = _mm256_cmple_ps(x, _mm256_setzero_ps());
    v8sf invalid_mask = _mm256_cmp_ps(x, _mm256_setzero_ps(), _CMP_LE_OS);
  
    x = _mm256_max_ps(x, *(v8sf*)_ps256_min_norm_pos);  /* cut off denormalized stuff */
  
    // can be done with AVX2
    imm0 = _mmREF_srli_epi32(_mm256_castps_si256(x), 23);
  
    /* keep only the fractional part */
    x = _mm256_and_ps(x, *(v8sf*)_ps256_inv_mant_mask);
    x = _mm256_or_ps(x, *(v8sf*)_ps256_0p5);
  
    // this is again another AVX2 instruction
    imm0 = _mmREF_sub_epi32(imm0, *(v8si*)_pi32_256_0x7f);
    v8sf e = _mm256_cvtepi32_ps(imm0);
  
    e = _mm256_add_ps(e, one);
  
    /* part2:
       if( x < SQRTHF ) {
         e -= 1;
         x = x + x - 1.0;
       } else { x = x - 1.0; }
    */
    //v8sf mask = _mm256_cmplt_ps(x, *(v8sf*)_ps256_cephes_SQRTHF);
    v8sf mask = _mm256_cmp_ps(x, *(v8sf*)_ps256_cephes_SQRTHF, _CMP_LT_OS);
    v8sf tmp = _mm256_and_ps(x, mask);
    x = _mm256_sub_ps(x, one);
    e = _mm256_sub_ps(e, _mm256_and_ps(one, mask));
    x = _mm256_add_ps(x, tmp);
  
    v8sf z = _mm256_mul_ps(x,x);
  
    v8sf y = *(v8sf*)_ps256_cephes_log_p0;
    y = _mm256_mul_ps(y, x);
    y = _mm256_add_ps(y, *(v8sf*)_ps256_cephes_log_p1);
    y = _mm256_mul_ps(y, x);
    y = _mm256_add_ps(y, *(v8sf*)_ps256_cephes_log_p2);
    y = _mm256_mul_ps(y, x);
    y = _mm256_add_ps(y, *(v8sf*)_ps256_cephes_log_p3);
    y = _mm256_mul_ps(y, x);
    y = _mm256_add_ps(y, *(v8sf*)_ps256_cephes_log_p4);
    y = _mm256_mul_ps(y, x);
    y = _mm256_add_ps(y, *(v8sf*)_ps256_cephes_log_p5);
    y = _mm256_mul_ps(y, x);
    y = _mm256_add_ps(y, *(v8sf*)_ps256_cephes_log_p6);
    y = _mm256_mul_ps(y, x);
    y = _mm256_add_ps(y, *(v8sf*)_ps256_cephes_log_p7);
    y = _mm256_mul_ps(y, x);
    y = _mm256_add_ps(y, *(v8sf*)_ps256_cephes_log_p8);
    y = _mm256_mul_ps(y, x);
  
    y = _mm256_mul_ps(y, z);
  
    tmp = _mm256_mul_ps(e, *(v8sf*)_ps256_cephes_log_q1);
    y = _mm256_add_ps(y, tmp);
  
  
    tmp = _mm256_mul_ps(z, *(v8sf*)_ps256_0p5);
    y = _mm256_sub_ps(y, tmp);
  
    tmp = _mm256_mul_ps(e, *(v8sf*)_ps256_cephes_log_q2);
    x = _mm256_add_ps(x, y);
    x = _mm256_add_ps(x, tmp);
    x = _mm256_or_ps(x, invalid_mask); // negative arg will be NAN
    return x;
  }
  
  _PS256_CONST(exp_hi,	88.3762626647949f);
  _PS256_CONST(exp_lo,	-88.3762626647949f);
  
  _PS256_CONST(cephes_LOG2EF, 1.44269504088896341f);
  _PS256_CONST(cephes_exp_C1, 0.693359375f);
  _PS256_CONST(cephes_exp_C2, -2.12194440e-4f);
  
  _PS256_CONST(cephes_exp_p0, 1.9875691500E-4f);
  _PS256_CONST(cephes_exp_p1, 1.3981999507E-3f);
  _PS256_CONST(cephes_exp_p2, 8.3334519073E-3f);
  _PS256_CONST(cephes_exp_p3, 4.1665795894E-2f);
  _PS256_CONST(cephes_exp_p4, 1.6666665459E-1f);
  _PS256_CONST(cephes_exp_p5, 5.0000001201E-1f);
  
  inline v8sf exp256_ps(v8sf x) {
    v8sf tmp = _mm256_setzero_ps(), fx;
    v8si imm0;
    v8sf one = *(v8sf*)_ps256_1;
  
    x = _mm256_min_ps(x, *(v8sf*)_ps256_exp_hi);
    x = _mm256_max_ps(x, *(v8sf*)_ps256_exp_lo);
  
    /* express exp(x) as exp(g + n*log(2)) */
    fx = _mm256_mul_ps(x, *(v8sf*)_ps256_cephes_LOG2EF);
    fx = _mm256_add_ps(fx, *(v8sf*)_ps256_0p5);
  
    /* how to perform a floorf with SSE: just below */
    //imm0 = _mm256_cvttps_epi32(fx);
    //tmp  = _mm256_cvtepi32_ps(imm0);
  
    tmp = _mm256_floor_ps(fx);
  
    /* if greater, substract 1 */
    //v8sf mask = _mm256_cmpgt_ps(tmp, fx);
    v8sf mask = _mm256_cmp_ps(tmp, fx, _CMP_GT_OS);
    mask = _mm256_and_ps(mask, one);
    fx = _mm256_sub_ps(tmp, mask);
  
    tmp = _mm256_mul_ps(fx, *(v8sf*)_ps256_cephes_exp_C1);
    v8sf z = _mm256_mul_ps(fx, *(v8sf*)_ps256_cephes_exp_C2);
    x = _mm256_sub_ps(x, tmp);
    x = _mm256_sub_ps(x, z);
  
    z = _mm256_mul_ps(x,x);
  
    v8sf y = *(v8sf*)_ps256_cephes_exp_p0;
    y = _mm256_mul_ps(y, x);
    y = _mm256_add_ps(y, *(v8sf*)_ps256_cephes_exp_p1);
    y = _mm256_mul_ps(y, x);
    y = _mm256_add_ps(y, *(v8sf*)_ps256_cephes_exp_p2);
    y = _mm256_mul_ps(y, x);
    y = _mm256_add_ps(y, *(v8sf*)_ps256_cephes_exp_p3);
    y = _mm256_mul_ps(y, x);
    y = _mm256_add_ps(y, *(v8sf*)_ps256_cephes_exp_p4);
    y = _mm256_mul_ps(y, x);
    y = _mm256_add_ps(y, *(v8sf*)_ps256_cephes_exp_p5);
    y = _mm256_mul_ps(y, z);
    y = _mm256_add_ps(y, x);
    y = _mm256_add_ps(y, one);
  
    /* build 2^n */
    imm0 = _mm256_cvttps_epi32(fx);
    // another two AVX2 instructions
    imm0 = _mmREF_add_epi32(imm0, *(v8si*)_pi32_256_0x7f);
    imm0 = _mmREF_slli_epi32(imm0, 23);
    v8sf pow2n = _mm256_castsi256_ps(imm0);
    y = _mm256_mul_ps(y, pow2n);
    return y;
  }
  
  _PS256_CONST(minus_cephes_DP1, -0.78515625f);
  _PS256_CONST(minus_cephes_DP2, -2.4187564849853515625e-4f);
  _PS256_CONST(minus_cephes_DP3, -3.77489497744594108e-8f);
  _PS256_CONST(sincof_p0, -1.9515295891E-4f);
  _PS256_CONST(sincof_p1,  8.3321608736E-3f);
  _PS256_CONST(sincof_p2, -1.6666654611E-1f);
  _PS256_CONST(coscof_p0,  2.443315711809948E-005f);
  _PS256_CONST(coscof_p1, -1.388731625493765E-003f);
  _PS256_CONST(coscof_p2,  4.166664568298827E-002f);
  _PS256_CONST(cephes_FOPI, 1.27323954473516f); // 4 / M_PI
  
  
  /* evaluation of 8 sines at onces using AVX intrisics
  
     The code is the exact rewriting of the cephes sinf function.
     Precision is excellent as long as x < 8192 (I did not bother to
     take into account the special handling they have for greater values
     -- it does not return garbage for arguments over 8192, though, but
     the extra precision is missing).
  
     Note that it is such that sinf((float)M_PI) = 8.74e-8, which is the
     surprising but correct result.
  
  */
  inline v8sf sin256_ps(v8sf x) { // any x
    v8sf xmm1, xmm2 = _mm256_setzero_ps(), xmm3, sign_bit, y;
    v8si imm0, imm2;
  
  #ifndef __AVX2__
    v4si imm0_1, imm0_2;
    v4si imm2_1, imm2_2;
  #endif
  
    sign_bit = x;
    /* take the absolute value */
    x = _mm256_and_ps(x, *(v8sf*)_ps256_inv_sign_mask);
    /* extract the sign bit (upper one) */
    sign_bit = _mm256_and_ps(sign_bit, *(v8sf*)_ps256_sign_mask);
  
    /* scale by 4/Pi */
    y = _mm256_mul_ps(x, *(v8sf*)_ps256_cephes_FOPI);
  
    /*
      Here we start a series of integer operations, which are in the
      realm of AVX2.
      If we don't have AVX, let's perform them using SSE2 directives
    */
  
  #ifdef __AVX2__
    /* store the integer part of y in mm0 */
    imm2 = _mm256_cvttps_epi32(y);
    /* j=(j+1) & (~1) (see the cephes sources) */
    // another two AVX2 instruction
    imm2 = _mm256_add_epi32(imm2, *(v8si*)_pi32_256_1);
    imm2 = _mm256_and_si256(imm2, *(v8si*)_pi32_256_inv1);
    y = _mm256_cvtepi32_ps(imm2);
  
    /* get the swap sign flag */
    imm0 = _mm256_and_si256(imm2, *(v8si*)_pi32_256_4);
    imm0 = _mm256_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 = _mm256_and_si256(imm2, *(v8si*)_pi32_256_2);
    imm2 = _mm256_cmpeq_epi32(imm2,*(v8si*)_pi32_256_0);
  #else
    /* we use SSE2 routines to perform the integer ops */
    COPY_IMM_TO_XMM(_mm256_cvttps_epi32(y),imm2_1,imm2_2);
  
    imm2_1 = _mm_add_epi32(imm2_1, *(v4si*)_pi32avx_1);
    imm2_2 = _mm_add_epi32(imm2_2, *(v4si*)_pi32avx_1);
  
    imm2_1 = _mm_and_si128(imm2_1, *(v4si*)_pi32avx_inv1);
    imm2_2 = _mm_and_si128(imm2_2, *(v4si*)_pi32avx_inv1);
  
    COPY_XMM_TO_IMM(imm2_1,imm2_2,imm2);
    y = _mm256_cvtepi32_ps(imm2);
  
    imm0_1 = _mm_and_si128(imm2_1, *(v4si*)_pi32avx_4);
    imm0_2 = _mm_and_si128(imm2_2, *(v4si*)_pi32avx_4);
  
    imm0_1 = _mm_slli_epi32(imm0_1, 29);
    imm0_2 = _mm_slli_epi32(imm0_2, 29);
  
    COPY_XMM_TO_IMM(imm0_1, imm0_2, imm0);
  
    imm2_1 = _mm_and_si128(imm2_1, *(v4si*)_pi32avx_2);
    imm2_2 = _mm_and_si128(imm2_2, *(v4si*)_pi32avx_2);
  
    imm2_1 = _mm_cmpeq_epi32(imm2_1, _mm_setzero_si128());
    imm2_2 = _mm_cmpeq_epi32(imm2_2, _mm_setzero_si128());
  
    COPY_XMM_TO_IMM(imm2_1, imm2_2, imm2);
  #endif
  
    v8sf swap_sign_bit = _mm256_castsi256_ps(imm0);
    v8sf poly_mask = _mm256_castsi256_ps(imm2);
    sign_bit = _mm256_xor_ps(sign_bit, swap_sign_bit);
  
    /* The magic pass: "Extended precision modular arithmetic"
       x = ((x - y * DP1) - y * DP2) - y * DP3; */
    xmm1 = *(v8sf*)_ps256_minus_cephes_DP1;
    xmm2 = *(v8sf*)_ps256_minus_cephes_DP2;
    xmm3 = *(v8sf*)_ps256_minus_cephes_DP3;
    xmm1 = _mm256_mul_ps(y, xmm1);
    xmm2 = _mm256_mul_ps(y, xmm2);
    xmm3 = _mm256_mul_ps(y, xmm3);
    x = _mm256_add_ps(x, xmm1);
    x = _mm256_add_ps(x, xmm2);
    x = _mm256_add_ps(x, xmm3);
  
    /* Evaluate the first polynom  (0 <= x <= Pi/4) */
    y = *(v8sf*)_ps256_coscof_p0;
    v8sf z = _mm256_mul_ps(x,x);
  
    y = _mm256_mul_ps(y, z);
    y = _mm256_add_ps(y, *(v8sf*)_ps256_coscof_p1);
    y = _mm256_mul_ps(y, z);
    y = _mm256_add_ps(y, *(v8sf*)_ps256_coscof_p2);
    y = _mm256_mul_ps(y, z);
    y = _mm256_mul_ps(y, z);
    v8sf tmp = _mm256_mul_ps(z, *(v8sf*)_ps256_0p5);
    y = _mm256_sub_ps(y, tmp);
    y = _mm256_add_ps(y, *(v8sf*)_ps256_1);
  
    /* Evaluate the second polynom  (Pi/4 <= x <= 0) */
  
    v8sf y2 = *(v8sf*)_ps256_sincof_p0;
    y2 = _mm256_mul_ps(y2, z);
    y2 = _mm256_add_ps(y2, *(v8sf*)_ps256_sincof_p1);
    y2 = _mm256_mul_ps(y2, z);
    y2 = _mm256_add_ps(y2, *(v8sf*)_ps256_sincof_p2);
    y2 = _mm256_mul_ps(y2, z);
    y2 = _mm256_mul_ps(y2, x);
    y2 = _mm256_add_ps(y2, x);
  
    /* select the correct result from the two polynoms */
    xmm3 = poly_mask;
    y2 = _mm256_and_ps(xmm3, y2); //, xmm3);
    y = _mm256_andnot_ps(xmm3, y);
    y = _mm256_add_ps(y,y2);
    /* update the sign */
    y = _mm256_xor_ps(y, sign_bit);
  
    return y;
  }
  
  /* almost the same as sin_ps */
  inline v8sf cos256_ps(v8sf x) { // any x
    v8sf xmm1, xmm2 = _mm256_setzero_ps(), xmm3, y;
    v8si imm0, imm2;
  
  #ifndef __AVX2__
    v4si imm0_1, imm0_2;
    v4si imm2_1, imm2_2;
  #endif
  
    /* take the absolute value */
    x = _mm256_and_ps(x, *(v8sf*)_ps256_inv_sign_mask);
  
    /* scale by 4/Pi */
    y = _mm256_mul_ps(x, *(v8sf*)_ps256_cephes_FOPI);
  
  #ifdef __AVX2__
    /* store the integer part of y in mm0 */
    imm2 = _mm256_cvttps_epi32(y);
    /* j=(j+1) & (~1) (see the cephes sources) */
    imm2 = _mm256_add_epi32(imm2, *(v8si*)_pi32_256_1);
    imm2 = _mm256_and_si256(imm2, *(v8si*)_pi32_256_inv1);
    y = _mm256_cvtepi32_ps(imm2);
    imm2 = _mm256_sub_epi32(imm2, *(v8si*)_pi32_256_2);
  
    /* get the swap sign flag */
    imm0 = _mm256_andnot_si256(imm2, *(v8si*)_pi32_256_4);
    imm0 = _mm256_slli_epi32(imm0, 29);
    /* get the polynom selection mask */
    imm2 = _mm256_and_si256(imm2, *(v8si*)_pi32_256_2);
    imm2 = _mm256_cmpeq_epi32(imm2, *(v8si*)_pi32_256_0);
  #else
  
    /* we use SSE2 routines to perform the integer ops */
    COPY_IMM_TO_XMM(_mm256_cvttps_epi32(y),imm2_1,imm2_2);
  
    imm2_1 = _mm_add_epi32(imm2_1, *(v4si*)_pi32avx_1);
    imm2_2 = _mm_add_epi32(imm2_2, *(v4si*)_pi32avx_1);
  
    imm2_1 = _mm_and_si128(imm2_1, *(v4si*)_pi32avx_inv1);
    imm2_2 = _mm_and_si128(imm2_2, *(v4si*)_pi32avx_inv1);
  
    COPY_XMM_TO_IMM(imm2_1,imm2_2,imm2);
    y = _mm256_cvtepi32_ps(imm2);
  
    imm2_1 = _mm_sub_epi32(imm2_1, *(v4si*)_pi32avx_2);
    imm2_2 = _mm_sub_epi32(imm2_2, *(v4si*)_pi32avx_2);
  
    imm0_1 = _mm_andnot_si128(imm2_1, *(v4si*)_pi32avx_4);
    imm0_2 = _mm_andnot_si128(imm2_2, *(v4si*)_pi32avx_4);
  
    imm0_1 = _mm_slli_epi32(imm0_1, 29);
    imm0_2 = _mm_slli_epi32(imm0_2, 29);
  
    COPY_XMM_TO_IMM(imm0_1, imm0_2, imm0);
  
    imm2_1 = _mm_and_si128(imm2_1, *(v4si*)_pi32avx_2);
    imm2_2 = _mm_and_si128(imm2_2, *(v4si*)_pi32avx_2);
  
    imm2_1 = _mm_cmpeq_epi32(imm2_1, _mm_setzero_si128());
    imm2_2 = _mm_cmpeq_epi32(imm2_2, _mm_setzero_si128());
  
    COPY_XMM_TO_IMM(imm2_1, imm2_2, imm2);
  #endif
  
    v8sf sign_bit = _mm256_castsi256_ps(imm0);
    v8sf poly_mask = _mm256_castsi256_ps(imm2);
  
    /* The magic pass: "Extended precision modular arithmetic"
       x = ((x - y * DP1) - y * DP2) - y * DP3; */
    xmm1 = *(v8sf*)_ps256_minus_cephes_DP1;
    xmm2 = *(v8sf*)_ps256_minus_cephes_DP2;
    xmm3 = *(v8sf*)_ps256_minus_cephes_DP3;
    xmm1 = _mm256_mul_ps(y, xmm1);
    xmm2 = _mm256_mul_ps(y, xmm2);
    xmm3 = _mm256_mul_ps(y, xmm3);
    x = _mm256_add_ps(x, xmm1);
    x = _mm256_add_ps(x, xmm2);
    x = _mm256_add_ps(x, xmm3);
  
    /* Evaluate the first polynom  (0 <= x <= Pi/4) */
    y = *(v8sf*)_ps256_coscof_p0;
    v8sf z = _mm256_mul_ps(x,x);
  
    y = _mm256_mul_ps(y, z);
    y = _mm256_add_ps(y, *(v8sf*)_ps256_coscof_p1);
    y = _mm256_mul_ps(y, z);
    y = _mm256_add_ps(y, *(v8sf*)_ps256_coscof_p2);
    y = _mm256_mul_ps(y, z);
    y = _mm256_mul_ps(y, z);
    v8sf tmp = _mm256_mul_ps(z, *(v8sf*)_ps256_0p5);
    y = _mm256_sub_ps(y, tmp);
    y = _mm256_add_ps(y, *(v8sf*)_ps256_1);
  
    /* Evaluate the second polynom  (Pi/4 <= x <= 0) */
  
    v8sf y2 = *(v8sf*)_ps256_sincof_p0;
    y2 = _mm256_mul_ps(y2, z);
    y2 = _mm256_add_ps(y2, *(v8sf*)_ps256_sincof_p1);
    y2 = _mm256_mul_ps(y2, z);
    y2 = _mm256_add_ps(y2, *(v8sf*)_ps256_sincof_p2);
    y2 = _mm256_mul_ps(y2, z);
    y2 = _mm256_mul_ps(y2, x);
    y2 = _mm256_add_ps(y2, x);
  
    /* select the correct result from the two polynoms */
    xmm3 = poly_mask;
    y2 = _mm256_and_ps(xmm3, y2); //, xmm3);
    y = _mm256_andnot_ps(xmm3, y);
    y = _mm256_add_ps(y,y2);
    /* update the sign */
    y = _mm256_xor_ps(y, sign_bit);
  
    return y;
  }
  
  /* since sin256_ps and cos256_ps are almost identical, sincos256_ps could replace both of them..
     it is almost as fast, and gives you a free cosine with your sine */
  inline void sincos256_ps(v8sf x, v8sf *s, v8sf *c) {
  
    v8sf xmm1, xmm2, xmm3 = _mm256_setzero_ps(), sign_bit_sin, y;
    v8si imm0, imm2, imm4;
  
  #ifndef __AVX2__
    v4si imm0_1, imm0_2;
    v4si imm2_1, imm2_2;
    v4si imm4_1, imm4_2;
  #endif
  
    sign_bit_sin = x;
    /* take the absolute value */
    x = _mm256_and_ps(x, *(v8sf*)_ps256_inv_sign_mask);
    /* extract the sign bit (upper one) */
    sign_bit_sin = _mm256_and_ps(sign_bit_sin, *(v8sf*)_ps256_sign_mask);
  
    /* scale by 4/Pi */
    y = _mm256_mul_ps(x, *(v8sf*)_ps256_cephes_FOPI);
  
  #ifdef __AVX2__
    /* store the integer part of y in imm2 */
    imm2 = _mm256_cvttps_epi32(y);
  
    /* j=(j+1) & (~1) (see the cephes sources) */
    imm2 = _mm256_add_epi32(imm2, *(v8si*)_pi32_256_1);
    imm2 = _mm256_and_si256(imm2, *(v8si*)_pi32_256_inv1);
  
    y = _mm256_cvtepi32_ps(imm2);
    imm4 = imm2;
  
    /* get the swap sign flag for the sine */
    imm0 = _mm256_and_si256(imm2, *(v8si*)_pi32_256_4);
    imm0 = _mm256_slli_epi32(imm0, 29);
    //v8sf swap_sign_bit_sin = _mm256_castsi256_ps(imm0);
  
    /* get the polynom selection mask for the sine*/
    imm2 = _mm256_and_si256(imm2, *(v8si*)_pi32_256_2);
    imm2 = _mm256_cmpeq_epi32(imm2, *(v8si*)_pi32_256_0);
    //v8sf poly_mask = _mm256_castsi256_ps(imm2);
  #else
    /* we use SSE2 routines to perform the integer ops */
    COPY_IMM_TO_XMM(_mm256_cvttps_epi32(y),imm2_1,imm2_2);
  
    imm2_1 = _mm_add_epi32(imm2_1, *(v4si*)_pi32avx_1);
    imm2_2 = _mm_add_epi32(imm2_2, *(v4si*)_pi32avx_1);
  
    imm2_1 = _mm_and_si128(imm2_1, *(v4si*)_pi32avx_inv1);
    imm2_2 = _mm_and_si128(imm2_2, *(v4si*)_pi32avx_inv1);
  
    COPY_XMM_TO_IMM(imm2_1,imm2_2,imm2);
    y = _mm256_cvtepi32_ps(imm2);
  
    imm4_1 = imm2_1;
    imm4_2 = imm2_2;
  
    imm0_1 = _mm_and_si128(imm2_1, *(v4si*)_pi32avx_4);
    imm0_2 = _mm_and_si128(imm2_2, *(v4si*)_pi32avx_4);
  
    imm0_1 = _mm_slli_epi32(imm0_1, 29);
    imm0_2 = _mm_slli_epi32(imm0_2, 29);
  
    COPY_XMM_TO_IMM(imm0_1, imm0_2, imm0);
  
    imm2_1 = _mm_and_si128(imm2_1, *(v4si*)_pi32avx_2);
    imm2_2 = _mm_and_si128(imm2_2, *(v4si*)_pi32avx_2);
  
    imm2_1 = _mm_cmpeq_epi32(imm2_1, _mm_setzero_si128());
    imm2_2 = _mm_cmpeq_epi32(imm2_2, _mm_setzero_si128());
  
    COPY_XMM_TO_IMM(imm2_1, imm2_2, imm2);
  #endif
    v8sf swap_sign_bit_sin = _mm256_castsi256_ps(imm0);
    v8sf poly_mask = _mm256_castsi256_ps(imm2);
  
    /* The magic pass: "Extended precision modular arithmetic"
       x = ((x - y * DP1) - y * DP2) - y * DP3; */
    xmm1 = *(v8sf*)_ps256_minus_cephes_DP1;
    xmm2 = *(v8sf*)_ps256_minus_cephes_DP2;
    xmm3 = *(v8sf*)_ps256_minus_cephes_DP3;
    xmm1 = _mm256_mul_ps(y, xmm1);
    xmm2 = _mm256_mul_ps(y, xmm2);
    xmm3 = _mm256_mul_ps(y, xmm3);
    x = _mm256_add_ps(x, xmm1);
    x = _mm256_add_ps(x, xmm2);
    x = _mm256_add_ps(x, xmm3);
  
  #ifdef __AVX2__
    imm4 = _mm256_sub_epi32(imm4, *(v8si*)_pi32_256_2);
    imm4 = _mm256_andnot_si256(imm4, *(v8si*)_pi32_256_4);
    imm4 = _mm256_slli_epi32(imm4, 29);
  #else
    imm4_1 = _mm_sub_epi32(imm4_1, *(v4si*)_pi32avx_2);
    imm4_2 = _mm_sub_epi32(imm4_2, *(v4si*)_pi32avx_2);
  
    imm4_1 = _mm_andnot_si128(imm4_1, *(v4si*)_pi32avx_4);
    imm4_2 = _mm_andnot_si128(imm4_2, *(v4si*)_pi32avx_4);
  
    imm4_1 = _mm_slli_epi32(imm4_1, 29);
    imm4_2 = _mm_slli_epi32(imm4_2, 29);
  
    COPY_XMM_TO_IMM(imm4_1, imm4_2, imm4);
  #endif
  
    v8sf sign_bit_cos = _mm256_castsi256_ps(imm4);
  
    sign_bit_sin = _mm256_xor_ps(sign_bit_sin, swap_sign_bit_sin);
  
    /* Evaluate the first polynom  (0 <= x <= Pi/4) */
    v8sf z = _mm256_mul_ps(x,x);
    y = *(v8sf*)_ps256_coscof_p0;
  
    y = _mm256_mul_ps(y, z);
    y = _mm256_add_ps(y, *(v8sf*)_ps256_coscof_p1);
    y = _mm256_mul_ps(y, z);
    y = _mm256_add_ps(y, *(v8sf*)_ps256_coscof_p2);
    y = _mm256_mul_ps(y, z);
    y = _mm256_mul_ps(y, z);
    v8sf tmp = _mm256_mul_ps(z, *(v8sf*)_ps256_0p5);
    y = _mm256_sub_ps(y, tmp);
    y = _mm256_add_ps(y, *(v8sf*)_ps256_1);
  
    /* Evaluate the second polynom  (Pi/4 <= x <= 0) */
  
    v8sf y2 = *(v8sf*)_ps256_sincof_p0;
    y2 = _mm256_mul_ps(y2, z);
    y2 = _mm256_add_ps(y2, *(v8sf*)_ps256_sincof_p1);
    y2 = _mm256_mul_ps(y2, z);
    y2 = _mm256_add_ps(y2, *(v8sf*)_ps256_sincof_p2);
    y2 = _mm256_mul_ps(y2, z);
    y2 = _mm256_mul_ps(y2, x);
    y2 = _mm256_add_ps(y2, x);
  
    /* select the correct result from the two polynoms */
    xmm3 = poly_mask;
    v8sf ysin2 = _mm256_and_ps(xmm3, y2);
    v8sf ysin1 = _mm256_andnot_ps(xmm3, y);
    y2 = _mm256_sub_ps(y2,ysin2);
    y = _mm256_sub_ps(y, ysin1);
  
    xmm1 = _mm256_add_ps(ysin1,ysin2);
    xmm2 = _mm256_add_ps(y,y2);
  
    /* update the sign */
    *s = _mm256_xor_ps(xmm1, sign_bit_sin);
    *c = _mm256_xor_ps(xmm2, sign_bit_cos);
  }
  
  