1 // Auto-generated file. Do not edit! 2 // Template: src/f32-velu/scalar-rr2-lut16-p3.c.in 3 // Generator: tools/xngen 4 // 5 // Copyright 2020 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/vunary.h> 15 16 #include <fp16/bitcasts.h> 17 18 19 extern XNN_INTERNAL const uint32_t xnn_table_exp2minus_k_over_16[16]; 20 xnn_f32_velu_ukernel__scalar_rr2_lut16_p3_x1(size_t n,const float * x,float * y,const union xnn_f32_elu_params params[restrict XNN_MIN_ELEMENTS (1)])21void xnn_f32_velu_ukernel__scalar_rr2_lut16_p3_x1( 22 size_t n, 23 const float* x, 24 float* y, 25 const union xnn_f32_elu_params params[restrict XNN_MIN_ELEMENTS(1)]) 26 { 27 assert(n % sizeof(float) == 0); 28 29 const float vprescale = params->scalar.prescale; 30 const float valpha = params->scalar.alpha; 31 const float vbeta = params->scalar.beta; 32 33 const float vmagic_bias = 0x1.800000p19f; 34 const float vlog2e = 0x1.715476p+0f; 35 const uint32_t vindex_mask = UINT32_C(0xF); 36 const float vsat_cutoff = -0x1.154246p+4f; 37 const float vminus_ln2_hi = -0x1.62E400p-1f; 38 const float vminus_ln2_lo = -0x1.7F7D1Cp-20f; 39 const float vc3 = 0x1.55561Cp-3f; 40 const float vc2 = 0x1.0001ECp-1f; 41 const float vone = 1.0f; 42 43 do { 44 float vx = *x++; 45 46 const float vz = vx * vprescale; 47 48 float vn = vz * vlog2e + vmagic_bias; 49 const uint32_t ven = fp32_to_bits(vn) << 19; 50 const uint32_t vidx = fp32_to_bits(vn) & vindex_mask; 51 vn -= vmagic_bias; 52 53 float vt = vn * vminus_ln2_hi + vz; 54 float vs = fp32_from_bits(xnn_table_exp2minus_k_over_16[vidx] + ven); 55 56 vt = vn * vminus_ln2_lo + vt; 57 if XNN_UNPREDICTABLE(vz <= vsat_cutoff) { 58 vs = 0.0f; 59 vt = 0.0f; 60 } 61 62 float vp = vc3 * vt + vc2; 63 vp *= vt; 64 65 vt *= vs; 66 vs -= vone; 67 vp = vp * vt + vt; 68 const float ve = (vp + vs) * valpha; 69 70 float vy = vx * vbeta; 71 if XNN_UNPREDICTABLE(vx < 0.0f) { 72 vy = ve; 73 } 74 75 *y++ = vy; 76 77 n -= sizeof(float); 78 } while (n != 0); 79 } 80