1 // Auto-generated file. Do not edit! 2 // Template: src/f32-vsigmoid/scalar-rr2-lut64-p2-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_64[64]; 20 xnn_f32_vsigmoid_ukernel__scalar_rr2_lut64_p2_div_x1(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_lut64_p2_div_x1( 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_lut64_p2.magic_bias; 30 const float vminus_log2e = params->scalar_rr2_lut64_p2.minus_log2e; 31 const uint32_t vindex_mask = UINT32_C(0x3F); 32 const float vln2_hi = params->scalar_rr2_lut64_p2.ln2_hi; 33 const float vln2_lo = params->scalar_rr2_lut64_p2.ln2_lo; 34 const float vc2 = params->scalar_rr2_lut64_p2.c2; 35 const float vone = params->scalar_rr2_lut64_p2.one; 36 const float vdenorm_cutoff = params->scalar_rr2_lut64_p2.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 uint32_t ve = float_as_uint32(vn) << 17; 45 const uint32_t vidx = float_as_uint32(vn) & vindex_mask; 46 const float vs = uint32_as_float(xnn_table_exp2minus_k_over_64[vidx] + ve); 47 vn -= vmagic_bias; 48 49 float vt = vn * vln2_hi + vz; 50 vt = vn * vln2_lo + vt; 51 52 float vp = vt * vc2; 53 vp = vt - vp * vt; 54 55 const float vy = vs - vs * vp; 56 const float vd = vy + vone; 57 58 float vf = vy / vd; 59 if XNN_UNPREDICTABLE(vz > vdenorm_cutoff) { 60 vf = 0.0f; 61 } 62 if XNN_UNPREDICTABLE(vx > 0.0f) { 63 vf = vone - vf; 64 } 65 66 *y++ = vf; 67 68 n -= sizeof(float); 69 } while (n != 0); 70 } 71