1 // Auto-generated file. Do not edit! 2 // Template: src/f32-vsigmoid/scalar-rr2-p5-div.c.in 3 // Generator: tools/xngen 4 // 5 // Copyright 2019 Google LLC 6 // 7 // This source code is licensed under the BSD-style license found in the 8 // LICENSE file in the root directory of this source tree. 9 10 #include <assert.h> 11 #include <math.h> 12 13 #include <xnnpack/common.h> 14 #include <xnnpack/math.h> 15 #include <xnnpack/vunary.h> 16 17 xnn_f32_vsigmoid_ukernel__scalar_rr2_p5_div_x1(size_t n,const float * x,float * y,const union xnn_f32_sigmoid_params params[restrict XNN_MIN_ELEMENTS (1)])18void xnn_f32_vsigmoid_ukernel__scalar_rr2_p5_div_x1( 19 size_t n, 20 const float* x, 21 float* y, 22 const union xnn_f32_sigmoid_params params[restrict XNN_MIN_ELEMENTS(1)]) 23 { 24 assert(n % sizeof(float) == 0); 25 26 const float vmagic_bias = params->scalar_rr2_p5.magic_bias; 27 const float vminus_log2e = params->scalar_rr2_p5.minus_log2e; 28 const float vln2_hi = params->scalar_rr2_p5.ln2_hi; 29 const float vln2_lo = params->scalar_rr2_p5.ln2_lo; 30 const float vc5 = params->scalar_rr2_p5.c5; 31 const float vc4 = params->scalar_rr2_p5.c4; 32 const float vc3 = params->scalar_rr2_p5.c3; 33 const float vc2 = params->scalar_rr2_p5.c2; 34 const float vc1 = params->scalar_rr2_p5.c1; 35 const float vone = params->scalar_rr2_p5.one; 36 const float vdenorm_cutoff = params->scalar_rr2_p5.denorm_cutoff; 37 38 do { 39 const float vx = *x++; 40 41 const float vz = fabsf(vx); 42 43 float vn = vz * vminus_log2e + vmagic_bias; 44 const float vs = uint32_as_float(float_as_uint32(vn) << 23); 45 vn -= vmagic_bias; 46 47 float vt = vn * vln2_hi + vz; 48 vt = vn * vln2_lo + vt; 49 50 float vp = vt * vc5 + vc4; 51 vp = vt * vp + vc3; 52 vp = vt * vp + vc2; 53 vp = vt * vp + vc1; 54 55 vt *= vs; 56 const float ve = vt * vp + vs; 57 const float vd = ve + vone; 58 59 float vf = ve / vd; 60 if XNN_UNPREDICTABLE(vz > vdenorm_cutoff) { 61 vf = 0.0f; 62 } 63 if XNN_UNPREDICTABLE(vx > 0.0f) { 64 vf = vone - vf; 65 } 66 67 *y++ = vf; 68 69 n -= sizeof(float); 70 } while (n != 0); 71 } 72