Marat Dukhan | f4db2f3 | 2020-06-30 10:55:30 -0700 | [diff] [blame] | 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 | $ABC = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ" |
| 9 | #include <assert.h> |
| 10 | #include <math.h> |
| 11 | |
| 12 | #include <arm_neon.h> |
| 13 | |
| 14 | #include <xnnpack/common.h> |
| 15 | #include <xnnpack/vunary.h> |
| 16 | |
| 17 | |
| 18 | void xnn_f32_vsqrt_ukernel__neonfma_nr1rsqrts1fma1adj_x${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_DISABLE_TSAN |
| 23 | { |
| 24 | assert(n != 0); |
| 25 | assert(n % sizeof(float) == 0); |
| 26 | |
| 27 | $if BATCH_TILE > 4: |
| 28 | const float32x4_t vhalf = vmovq_n_f32(0.5f); |
| 29 | for (; n >= ${BATCH_TILE} * sizeof(float); n -= ${BATCH_TILE} * sizeof(float)) { |
| 30 | $for N in range(0, BATCH_TILE, 4): |
| 31 | const float32x4_t vx${ABC[N:N+4]} = vld1q_f32(x); x += 4; |
| 32 | |
| 33 | $for N in range(0, BATCH_TILE, 4): |
| 34 | float32x4_t vrsqrtx${ABC[N:N+4]} = vrsqrteq_f32(vx${ABC[N:N+4]}); |
| 35 | |
| 36 | $for N in range(0, BATCH_TILE, 4): |
| 37 | const float32x4_t vrx${ABC[N:N+4]} = vmulq_f32(vrsqrtx${ABC[N:N+4]}, vrsqrtx${ABC[N:N+4]}); |
| 38 | |
| 39 | $for N in range(0, BATCH_TILE, 4): |
| 40 | const float32x4_t vcorrection${ABC[N:N+4]} = vrsqrtsq_f32(vx${ABC[N:N+4]}, vrx${ABC[N:N+4]}); |
| 41 | |
| 42 | $for N in range(0, BATCH_TILE, 4): |
| 43 | vrsqrtx${ABC[N:N+4]} = vmulq_f32(vrsqrtx${ABC[N:N+4]}, vcorrection${ABC[N:N+4]}); |
| 44 | |
| 45 | $for N in range(0, BATCH_TILE, 4): |
| 46 | float32x4_t vsqrtx${ABC[N:N+4]} = vmulq_f32(vrsqrtx${ABC[N:N+4]}, vx${ABC[N:N+4]}); |
| 47 | float32x4_t vhalfrsqrtx${ABC[N:N+4]} = vmulq_f32(vrsqrtx${ABC[N:N+4]}, vhalf); |
| 48 | |
| 49 | $for N in range(0, BATCH_TILE, 4): |
| 50 | const float32x4_t vresidual${ABC[N:N+4]} = vfmsq_f32(vhalf, vsqrtx${ABC[N:N+4]}, vhalfrsqrtx${ABC[N:N+4]}); |
| 51 | |
| 52 | $for N in range(0, BATCH_TILE, 4): |
| 53 | vhalfrsqrtx${ABC[N:N+4]} = vfmaq_f32(vhalfrsqrtx${ABC[N:N+4]}, vresidual${ABC[N:N+4]}, vhalfrsqrtx${ABC[N:N+4]}); |
| 54 | vsqrtx${ABC[N:N+4]} = vfmaq_f32(vsqrtx${ABC[N:N+4]}, vresidual${ABC[N:N+4]}, vsqrtx${ABC[N:N+4]}); |
| 55 | |
| 56 | $for N in range(0, BATCH_TILE, 4): |
| 57 | const float32x4_t vadjustment${ABC[N:N+4]} = vfmsq_f32(vx${ABC[N:N+4]}, vsqrtx${ABC[N:N+4]}, vsqrtx${ABC[N:N+4]}); |
| 58 | |
| 59 | $for N in range(0, BATCH_TILE, 4): |
| 60 | const float32x4_t vy${ABC[N:N+4]} = vfmaq_f32(vsqrtx${ABC[N:N+4]}, vhalfrsqrtx${ABC[N:N+4]}, vadjustment${ABC[N:N+4]}); |
| 61 | |
| 62 | $for N in range(0, BATCH_TILE, 4): |
| 63 | vst1q_f32(y, vy${ABC[N:N+4]}); y += 4; |
| 64 | } |
| 65 | if XNN_UNLIKELY(n != 0) { |
| 66 | do { |
| 67 | const float vx = *x++; |
| 68 | const float vy = sqrtf(vx); |
| 69 | *y++ = vy; |
| 70 | n -= sizeof(float); |
| 71 | } while (n != 0); |
| 72 | } |
| 73 | } |