1 // Auto-generated file. Do not edit!
2 // Template: src/f32-vsqrt/fma3-nr1fma1adj.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
12 #include <immintrin.h>
13
14 #include <xnnpack/common.h>
15 #include <xnnpack/vunary.h>
16
17
xnn_f32_vsqrt_ukernel__fma3_nr1fma1adj_x24(size_t n,const float * x,float * y,const union xnn_f32_sqrt_params params[restrict XNN_MIN_ELEMENTS (1)])18 void xnn_f32_vsqrt_ukernel__fma3_nr1fma1adj_x24(
19 size_t n,
20 const float* x,
21 float* y,
22 const union xnn_f32_sqrt_params params[restrict XNN_MIN_ELEMENTS(1)])
23 {
24 assert(n != 0);
25 assert(n % sizeof(float) == 0);
26
27 const __m256 vhalf = _mm256_load_ps(params->fma.half);
28 for (; n >= 24 * sizeof(float); n -= 24 * sizeof(float)) {
29 const __m256 vx0 = _mm256_loadu_ps(x);
30 const __m256 vx1 = _mm256_loadu_ps(x + 8);
31 const __m256 vx2 = _mm256_loadu_ps(x + 16);
32 x += 24;
33
34 const __m256 vrsqrtx0 = _mm256_rsqrt_ps(vx0);
35 const __m256 vrsqrtx1 = _mm256_rsqrt_ps(vx1);
36 const __m256 vrsqrtx2 = _mm256_rsqrt_ps(vx2);
37
38 __m256 vsqrtx0 = _mm256_mul_ps(vrsqrtx0, vx0);
39 __m256 vhalfrsqrtx0 = _mm256_mul_ps(vrsqrtx0, vhalf);
40 __m256 vsqrtx1 = _mm256_mul_ps(vrsqrtx1, vx1);
41 __m256 vhalfrsqrtx1 = _mm256_mul_ps(vrsqrtx1, vhalf);
42 __m256 vsqrtx2 = _mm256_mul_ps(vrsqrtx2, vx2);
43 __m256 vhalfrsqrtx2 = _mm256_mul_ps(vrsqrtx2, vhalf);
44
45 const __m256 vresidual0 = _mm256_fnmadd_ps(vsqrtx0, vhalfrsqrtx0, vhalf);
46 const __m256 vresidual1 = _mm256_fnmadd_ps(vsqrtx1, vhalfrsqrtx1, vhalf);
47 const __m256 vresidual2 = _mm256_fnmadd_ps(vsqrtx2, vhalfrsqrtx2, vhalf);
48
49 vhalfrsqrtx0 = _mm256_fmadd_ps(vhalfrsqrtx0, vresidual0, vhalfrsqrtx0);
50 vsqrtx0 = _mm256_fmadd_ps(vsqrtx0, vresidual0, vsqrtx0);
51 vhalfrsqrtx1 = _mm256_fmadd_ps(vhalfrsqrtx1, vresidual1, vhalfrsqrtx1);
52 vsqrtx1 = _mm256_fmadd_ps(vsqrtx1, vresidual1, vsqrtx1);
53 vhalfrsqrtx2 = _mm256_fmadd_ps(vhalfrsqrtx2, vresidual2, vhalfrsqrtx2);
54 vsqrtx2 = _mm256_fmadd_ps(vsqrtx2, vresidual2, vsqrtx2);
55
56 const __m256 vadjustment0 = _mm256_fnmadd_ps(vsqrtx0, vsqrtx0, vx0);
57 const __m256 vadjustment1 = _mm256_fnmadd_ps(vsqrtx1, vsqrtx1, vx1);
58 const __m256 vadjustment2 = _mm256_fnmadd_ps(vsqrtx2, vsqrtx2, vx2);
59
60 const __m256 vy0 = _mm256_fmadd_ps(vhalfrsqrtx0, vadjustment0, vsqrtx0);
61 const __m256 vy1 = _mm256_fmadd_ps(vhalfrsqrtx1, vadjustment1, vsqrtx1);
62 const __m256 vy2 = _mm256_fmadd_ps(vhalfrsqrtx2, vadjustment2, vsqrtx2);
63
64 _mm256_storeu_ps(y, vy0);
65 _mm256_storeu_ps(y + 8, vy1);
66 _mm256_storeu_ps(y + 16, vy2);
67 y += 24;
68 }
69 for (; n >= 8 * sizeof(float); n -= 8 * sizeof(float)) {
70 const __m256 vx = _mm256_loadu_ps(x);
71 x += 8;
72
73 const __m256 vrsqrtx = _mm256_rsqrt_ps(vx);
74 __m256 vsqrtx = _mm256_mul_ps(vrsqrtx, vx);
75 __m256 vhalfrsqrtx = _mm256_mul_ps(vrsqrtx, vhalf);
76 const __m256 vresidual = _mm256_fnmadd_ps(vsqrtx, vhalfrsqrtx, vhalf);
77 vhalfrsqrtx = _mm256_fmadd_ps(vhalfrsqrtx, vresidual, vhalfrsqrtx);
78 vsqrtx = _mm256_fmadd_ps(vsqrtx, vresidual, vsqrtx);
79 const __m256 vadjustment = _mm256_fnmadd_ps(vsqrtx, vsqrtx, vx);
80 const __m256 vy = _mm256_fmadd_ps(vhalfrsqrtx, vadjustment, vsqrtx);
81
82 _mm256_storeu_ps(y, vy);
83 y += 8;
84 }
85 if XNN_UNLIKELY(n != 0) {
86 assert(n >= 1 * sizeof(float));
87 assert(n <= 7 * sizeof(float));
88 const __m256i vmask = _mm256_loadu_si256((const __m256i*) ((uintptr_t) ¶ms->fma.mask_table[7] - n));
89
90 const __m256 vx = _mm256_maskload_ps(x, vmask);
91
92 const __m256 vrsqrtx = _mm256_rsqrt_ps(vx);
93 __m256 vsqrtx = _mm256_mul_ps(vrsqrtx, vx);
94 __m256 vhalfrsqrtx = _mm256_mul_ps(vrsqrtx, vhalf);
95 const __m256 vresidual = _mm256_fnmadd_ps(vsqrtx, vhalfrsqrtx, vhalf);
96 vhalfrsqrtx = _mm256_fmadd_ps(vhalfrsqrtx, vresidual, vhalfrsqrtx);
97 vsqrtx = _mm256_fmadd_ps(vsqrtx, vresidual, vsqrtx);
98 const __m256 vadjustment = _mm256_fnmadd_ps(vsqrtx, vsqrtx, vx);
99 const __m256 vy = _mm256_fmadd_ps(vhalfrsqrtx, vadjustment, vsqrtx);
100
101 __m128 vy_lo = _mm256_castps256_ps128(vy);
102 if (n & (4 * sizeof(float))) {
103 _mm_storeu_ps(y, vy_lo);
104 vy_lo = _mm256_extractf128_ps(vy, 1);
105 y += 4;
106 }
107 if (n & (2 * sizeof(float))) {
108 _mm_storel_pi((__m64*) y, vy_lo);
109 vy_lo = _mm_movehl_ps(vy_lo, vy_lo);
110 y += 2;
111 }
112 if (n & (1 * sizeof(float))) {
113 _mm_store_ss(y, vy_lo);
114 }
115 }
116 }
117