1// Copyright 2020 Google LLC 2// 3// This source code is licensed under the BSD-style license found in the 4// LICENSE file in the root directory of this source tree. 5 6$assert BATCH_TILE % 4 == 0 7$assert BATCH_TILE >= 4 8$ABC = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ" 9#include <assert.h> 10#include <math.h> 11 12#include <arm_neon.h> 13 14#include <xnnpack/common.h> 15#include <xnnpack/vunary.h> 16 17 18void xnn_f32_vsqrt_ukernel__neon_sqrt_x${BATCH_TILE}( 19 size_t n, 20 const float* x, 21 float* y, 22 const union xnn_f32_sqrt_params params[restrict XNN_MIN_ELEMENTS(1)]) XNN_OOB_READS 23{ 24 assert(n != 0); 25 assert(n % sizeof(float) == 0); 26 27 $if BATCH_TILE > 4: 28 for (; n >= ${BATCH_TILE} * sizeof(float); n -= ${BATCH_TILE} * sizeof(float)) { 29 $for N in range(0, BATCH_TILE, 4): 30 const float32x4_t vx${ABC[N:N+4]} = vld1q_f32(x); x += 4; 31 32 $for N in range(0, BATCH_TILE, 4): 33 const float32x4_t vy${ABC[N:N+4]} = vsqrtq_f32(vx${ABC[N:N+4]}); 34 35 $for N in range(0, BATCH_TILE, 4): 36 vst1q_f32(y, vy${ABC[N:N+4]}); y += 4; 37 } 38 for (; n >= 4 * sizeof(float); n -= 4 * sizeof(float)) { 39 const float32x4_t vx = vld1q_f32(x); x += 4; 40 const float32x4_t vy = vsqrtq_f32(vx); 41 vst1q_f32(y, vy); y += 4; 42 } 43 if XNN_UNLIKELY(n != 0) { 44 const float32x4_t vx = vld1q_f32(x); 45 46 float32x2_t vy_lo = vsqrt_f32(vget_low_f32(vx)); 47 const float32x2_t vx_hi = vget_high_f32(vx); 48 if (n & (2 * sizeof(float))) { 49 vst1_f32(y, vy_lo); y += 2; 50 vy_lo = vsqrt_f32(vx_hi); 51 } 52 if (n & (1 * sizeof(float))) { 53 vst1_lane_f32(y, vy_lo, 0); 54 } 55 } 56} 57