1 // Auto-generated file. Do not edit! 2 // Template: src/f32-vsigmoid/scalar-rr2-lut2048-p1-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 18 // Note redefine as uint32[] to avoid redundant bitcasts. 19 extern XNN_INTERNAL const uint32_t xnn_table_exp2minus_k_over_2048[2048]; 20 xnn_f32_vsigmoid_ukernel__scalar_rr2_lut2048_p1_div_x2(size_t n,const float * x,float * y,const union xnn_f32_sigmoid_params params[restrict XNN_MIN_ELEMENTS (1)])21void xnn_f32_vsigmoid_ukernel__scalar_rr2_lut2048_p1_div_x2( 22 size_t n, 23 const float* x, 24 float* y, 25 const union xnn_f32_sigmoid_params params[restrict XNN_MIN_ELEMENTS(1)]) 26 { 27 assert(n % sizeof(float) == 0); 28 29 const float vmagic_bias = params->scalar_rr2_lut2048_p1.magic_bias; 30 const float vminus_log2e = params->scalar_rr2_lut2048_p1.minus_log2e; 31 const uint32_t vindex_mask = UINT32_C(0x7FF); 32 const float vln2_hi = params->scalar_rr2_lut2048_p1.ln2_hi; 33 const float vln2_lo = params->scalar_rr2_lut2048_p1.ln2_lo; 34 const float vc1 = params->scalar_rr2_lut2048_p1.c1; 35 const float vone = params->scalar_rr2_lut2048_p1.one; 36 const float vdenorm_cutoff = params->scalar_rr2_lut2048_p1.denorm_cutoff; 37 38 for (; n >= 2 * sizeof(float); n -= 2 * sizeof(float)) { 39 const float vx0 = x[0]; 40 const float vx1 = x[1]; 41 x += 2; 42 43 const float vz0 = fabsf(vx0); 44 const float vz1 = fabsf(vx1); 45 46 float vn0 = vz0 * vminus_log2e + vmagic_bias; 47 float vn1 = vz1 * vminus_log2e + vmagic_bias; 48 49 const uint32_t ve0 = float_as_uint32(vn0) << 12; 50 const uint32_t ve1 = float_as_uint32(vn1) << 12; 51 52 const uint32_t vidx0 = float_as_uint32(vn0) & vindex_mask; 53 const float vs0 = uint32_as_float(xnn_table_exp2minus_k_over_2048[vidx0] + ve0); 54 const uint32_t vidx1 = float_as_uint32(vn1) & vindex_mask; 55 const float vs1 = uint32_as_float(xnn_table_exp2minus_k_over_2048[vidx1] + ve1); 56 57 vn0 -= vmagic_bias; 58 vn1 -= vmagic_bias; 59 60 float vt0 = vn0 * vln2_hi + vz0; 61 float vt1 = vn1 * vln2_hi + vz1; 62 63 vt0 = vn0 * vln2_lo + vt0; 64 vt1 = vn1 * vln2_lo + vt1; 65 66 const float vp0 = vt0 * vc1; 67 const float vp1 = vt1 * vc1; 68 69 const float vy0 = vp0 * vs0 + vs0; 70 const float vy1 = vp1 * vs1 + vs1; 71 72 const float vd0 = vy0 + vone; 73 const float vd1 = vy1 + vone; 74 75 float vf0 = vy0 / vd0; 76 float vf1 = vy1 / vd1; 77 78 if XNN_UNPREDICTABLE(vz0 > vdenorm_cutoff) { 79 vf0 = 0.0f; 80 } 81 if XNN_UNPREDICTABLE(vz1 > vdenorm_cutoff) { 82 vf1 = 0.0f; 83 } 84 85 if XNN_UNPREDICTABLE(vx0 > 0.0f) { 86 vf0 = vone - vf0; 87 } 88 if XNN_UNPREDICTABLE(vx1 > 0.0f) { 89 vf1 = vone - vf1; 90 } 91 92 y[0] = vf0; 93 y[1] = vf1; 94 y += 2; 95 } 96 if XNN_UNLIKELY(n != 0) { 97 const float vx = *x; 98 99 const float vz = fabsf(vx); 100 101 float vn = vz * vminus_log2e + vmagic_bias; 102 const uint32_t ve = float_as_uint32(vn) << 12; 103 const uint32_t vidx = float_as_uint32(vn) & vindex_mask; 104 const float vs = uint32_as_float(xnn_table_exp2minus_k_over_2048[vidx] + ve); 105 vn -= vmagic_bias; 106 107 float vt = vn * vln2_hi + vz; 108 vt = vn * vln2_lo + vt; 109 110 const float vp = vt * vc1; 111 const float vy = vp * vs + vs; 112 113 const float vd = vy + vone; 114 float vf = vy / vd; 115 if XNN_UNPREDICTABLE(vz > vdenorm_cutoff) { 116 vf = 0.0f; 117 } 118 if XNN_UNPREDICTABLE(vx > 0.0f) { 119 vf = vone - vf; 120 } 121 122 *y = vf; 123 } 124 } 125