1 // Copyright (c) Facebook, Inc. and its affiliates.
2 // All rights reserved.
3 //
4 // Copyright 2019 Google LLC
5 //
6 // This source code is licensed under the BSD-style license found in the
7 // LICENSE file in the root directory of this source tree.
8
9 #include <assert.h>
10 #include <stdint.h>
11 #include <stddef.h>
12
13 #include <emmintrin.h>
14
15 #include <xnnpack/math.h>
16 #include <xnnpack/requantization-stubs.h>
17
18
xnn_qs8_requantize_rndna__sse2(size_t n,const int32_t * input,float scale,int8_t zero_point,int8_t qmin,int8_t qmax,int8_t * output)19 void xnn_qs8_requantize_rndna__sse2(
20 size_t n,
21 const int32_t* input,
22 float scale,
23 int8_t zero_point,
24 int8_t qmin,
25 int8_t qmax,
26 int8_t* output)
27 {
28 assert(n % 16 == 0);
29 assert(scale < 1.0f);
30 assert(scale >= 0x1.0p-32f);
31
32 const uint32_t scale_bits = float_as_uint32(scale);
33 const uint32_t multiplier = (scale_bits & UINT32_C(0x007FFFFF)) | UINT32_C(0x00800000);
34 const uint32_t shift = 127 + 23 - (scale_bits >> 23);
35 assert(shift >= 24);
36 assert(shift < 56);
37 const uint64_t rounding = UINT64_C(1) << (shift - 1);
38
39 const __m128i vmultiplier = _mm_set1_epi32(multiplier);
40 const __m128i vzero_point = _mm_set1_epi16((short) zero_point);
41 const __m128i vqmin = _mm_set1_epi8((short) qmin);
42 const __m128i vqmax = _mm_set1_epi8((short) qmax);
43 const __m128i vshift = _mm_cvtsi32_si128((int) shift);
44 const __m128i vrounding = _mm_set1_epi64x(rounding);
45 for (; n != 0; n -= 16) {
46 const __m128i x = _mm_loadu_si128((const __m128i*) input);
47 const __m128i y = _mm_loadu_si128((const __m128i*) (input + 4));
48 const __m128i z = _mm_loadu_si128((const __m128i*) (input + 8));
49 const __m128i w = _mm_loadu_si128((const __m128i*) (input + 12));
50 input += 16;
51
52 const __m128i x_neg_mask = _mm_cmpgt_epi32(_mm_setzero_si128(), x);
53 const __m128i y_neg_mask = _mm_cmpgt_epi32(_mm_setzero_si128(), y);
54 const __m128i z_neg_mask = _mm_cmpgt_epi32(_mm_setzero_si128(), z);
55 const __m128i w_neg_mask = _mm_cmpgt_epi32(_mm_setzero_si128(), w);
56
57 const __m128i x_abs0123 = _mm_sub_epi32(_mm_xor_si128(x, x_neg_mask), x_neg_mask);
58 const __m128i y_abs0123 = _mm_sub_epi32(_mm_xor_si128(y, y_neg_mask), y_neg_mask);
59 const __m128i z_abs0123 = _mm_sub_epi32(_mm_xor_si128(z, z_neg_mask), z_neg_mask);
60 const __m128i w_abs0123 = _mm_sub_epi32(_mm_xor_si128(w, w_neg_mask), w_neg_mask);
61
62 const __m128i x_abs1032 = _mm_shuffle_epi32(x_abs0123, _MM_SHUFFLE(2, 3, 0, 1));
63 const __m128i y_abs1032 = _mm_shuffle_epi32(y_abs0123, _MM_SHUFFLE(2, 3, 0, 1));
64 const __m128i z_abs1032 = _mm_shuffle_epi32(z_abs0123, _MM_SHUFFLE(2, 3, 0, 1));
65 const __m128i w_abs1032 = _mm_shuffle_epi32(w_abs0123, _MM_SHUFFLE(2, 3, 0, 1));
66
67 const __m128i x_absmul02 = _mm_mul_epu32(x_abs0123, vmultiplier);
68 const __m128i y_absmul02 = _mm_mul_epu32(y_abs0123, vmultiplier);
69 const __m128i z_absmul02 = _mm_mul_epu32(z_abs0123, vmultiplier);
70 const __m128i w_absmul02 = _mm_mul_epu32(w_abs0123, vmultiplier);
71
72 const __m128i x_absmul13 = _mm_mul_epu32(x_abs1032, vmultiplier);
73 const __m128i y_absmul13 = _mm_mul_epu32(y_abs1032, vmultiplier);
74 const __m128i z_absmul13 = _mm_mul_epu32(z_abs1032, vmultiplier);
75 const __m128i w_absmul13 = _mm_mul_epu32(w_abs1032, vmultiplier);
76
77 const __m128i x_abs_scaled02 = _mm_srl_epi64(_mm_add_epi64(x_absmul02, vrounding), vshift);
78 const __m128i x_abs_scaled13 = _mm_srl_epi64(_mm_add_epi64(x_absmul13, vrounding), vshift);
79 const __m128i y_abs_scaled02 = _mm_srl_epi64(_mm_add_epi64(y_absmul02, vrounding), vshift);
80 const __m128i y_abs_scaled13 = _mm_srl_epi64(_mm_add_epi64(y_absmul13, vrounding), vshift);
81 const __m128i z_abs_scaled02 = _mm_srl_epi64(_mm_add_epi64(z_absmul02, vrounding), vshift);
82 const __m128i z_abs_scaled13 = _mm_srl_epi64(_mm_add_epi64(z_absmul13, vrounding), vshift);
83 const __m128i w_abs_scaled02 = _mm_srl_epi64(_mm_add_epi64(w_absmul02, vrounding), vshift);
84 const __m128i w_abs_scaled13 = _mm_srl_epi64(_mm_add_epi64(w_absmul13, vrounding), vshift);
85
86 const __m128i x_abs_scaled0213 = _mm_castps_si128(
87 _mm_shuffle_ps(_mm_castsi128_ps(x_abs_scaled02), _mm_castsi128_ps(x_abs_scaled13), _MM_SHUFFLE(2, 0, 2, 0)));
88 const __m128i y_abs_scaled0213 = _mm_castps_si128(
89 _mm_shuffle_ps(_mm_castsi128_ps(y_abs_scaled02), _mm_castsi128_ps(y_abs_scaled13), _MM_SHUFFLE(2, 0, 2, 0)));
90 const __m128i z_abs_scaled0213 = _mm_castps_si128(
91 _mm_shuffle_ps(_mm_castsi128_ps(z_abs_scaled02), _mm_castsi128_ps(z_abs_scaled13), _MM_SHUFFLE(2, 0, 2, 0)));
92 const __m128i w_abs_scaled0213 = _mm_castps_si128(
93 _mm_shuffle_ps(_mm_castsi128_ps(w_abs_scaled02), _mm_castsi128_ps(w_abs_scaled13), _MM_SHUFFLE(2, 0, 2, 0)));
94
95 const __m128i x_abs_scaled = _mm_shuffle_epi32(x_abs_scaled0213, _MM_SHUFFLE(3, 1, 2, 0));
96 const __m128i y_abs_scaled = _mm_shuffle_epi32(y_abs_scaled0213, _MM_SHUFFLE(3, 1, 2, 0));
97 const __m128i z_abs_scaled = _mm_shuffle_epi32(z_abs_scaled0213, _MM_SHUFFLE(3, 1, 2, 0));
98 const __m128i w_abs_scaled = _mm_shuffle_epi32(w_abs_scaled0213, _MM_SHUFFLE(3, 1, 2, 0));
99
100 const __m128i x_scaled = _mm_sub_epi32(_mm_xor_si128(x_abs_scaled, x_neg_mask), x_neg_mask);
101 const __m128i y_scaled = _mm_sub_epi32(_mm_xor_si128(y_abs_scaled, y_neg_mask), y_neg_mask);
102 const __m128i z_scaled = _mm_sub_epi32(_mm_xor_si128(z_abs_scaled, z_neg_mask), z_neg_mask);
103 const __m128i w_scaled = _mm_sub_epi32(_mm_xor_si128(w_abs_scaled, w_neg_mask), w_neg_mask);
104
105 const __m128i xy_packed = _mm_adds_epi16(_mm_packs_epi32(x_scaled, y_scaled), vzero_point);
106 const __m128i zw_packed = _mm_adds_epi16(_mm_packs_epi32(z_scaled, w_scaled), vzero_point);
107 const __m128i xy_clamped = _mm_max_epi16(_mm_min_epi16(xy_packed, vqmax), vqmin);
108 const __m128i zw_clamped = _mm_max_epi16(_mm_min_epi16(zw_packed, vqmax), vqmin);
109 const __m128i xyzw_clamped = _mm_packs_epi16(xy_clamped, zw_clamped);
110
111 // 4x PXOR (setzero)
112 // 8x PSUBD
113 // 8x PXOR
114 // 8x PSHUFD
115 // 8x PMULUDQ
116 // 8x PSRLQ
117 // 8x PADDQ
118 // 4x SHUFPS
119 // 2x PACKSSDW
120 // 2x PADDSW
121 // 2x PMAXSW
122 // 2x PMINSW
123 // 1x PACKSSWB
124 // ---------------------
125 // 63 instructions total
126
127 _mm_storeu_si128((__m128i*) output, xyzw_clamped);
128 output += 16;
129 }
130 }
131