2 * Copyright (c) 2016 Cisco and/or its affiliates.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
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48 #ifndef included_clib_memcpy_sse3_h
49 #define included_clib_memcpy_sse3_h
52 #include <x86intrin.h>
54 typedef u8 u8x16u __attribute__ ((vector_size (16), aligned (1)));
55 typedef u8 u8x32u __attribute__ ((vector_size (32), aligned (1)));
58 clib_mov16 (u8 * dst, const u8 * src)
60 *(u8x16u *) dst = *(u8x16u *) src;
64 clib_mov32 (u8 * dst, const u8 * src)
66 *(u8x32u *) dst = *(u8x32u *) src;
70 clib_mov64 (u8 * dst, const u8 * src)
72 clib_mov32 ((u8 *) dst + 0 * 32, (const u8 *) src + 0 * 32);
73 clib_mov32 ((u8 *) dst + 1 * 32, (const u8 *) src + 1 * 32);
77 clib_mov128 (u8 * dst, const u8 * src)
79 clib_mov64 ((u8 *) dst + 0 * 64, (const u8 *) src + 0 * 64);
80 clib_mov64 ((u8 *) dst + 1 * 64, (const u8 *) src + 1 * 64);
84 clib_mov256 (u8 * dst, const u8 * src)
86 clib_mov128 ((u8 *) dst + 0 * 128, (const u8 *) src + 0 * 128);
87 clib_mov128 ((u8 *) dst + 1 * 128, (const u8 *) src + 1 * 128);
91 * Macro for copying unaligned block from one location to another with constant load offset,
92 * 47 bytes leftover maximum,
93 * locations should not overlap.
96 * - Load offset is <offset>, which must be immediate value within [1, 15]
97 * - For <src>, make sure <offset> bit backwards & <16 - offset> bit forwards are available for loading
98 * - <dst>, <src>, <len> must be variables
99 * - __m128i <xmm0> ~ <xmm8> must be pre-defined
101 #define CLIB_MVUNALIGN_LEFT47_IMM(dst, src, len, offset) \
104 while (len >= 128 + 16 - offset) { \
105 xmm0 = _mm_loadu_si128((const __m128i *)((const u8 *)src - offset + 0 * 16)); \
107 xmm1 = _mm_loadu_si128((const __m128i *)((const u8 *)src - offset + 1 * 16)); \
108 xmm2 = _mm_loadu_si128((const __m128i *)((const u8 *)src - offset + 2 * 16)); \
109 xmm3 = _mm_loadu_si128((const __m128i *)((const u8 *)src - offset + 3 * 16)); \
110 xmm4 = _mm_loadu_si128((const __m128i *)((const u8 *)src - offset + 4 * 16)); \
111 xmm5 = _mm_loadu_si128((const __m128i *)((const u8 *)src - offset + 5 * 16)); \
112 xmm6 = _mm_loadu_si128((const __m128i *)((const u8 *)src - offset + 6 * 16)); \
113 xmm7 = _mm_loadu_si128((const __m128i *)((const u8 *)src - offset + 7 * 16)); \
114 xmm8 = _mm_loadu_si128((const __m128i *)((const u8 *)src - offset + 8 * 16)); \
115 src = (const u8 *)src + 128; \
116 _mm_storeu_si128((__m128i *)((u8 *)dst + 0 * 16), _mm_alignr_epi8(xmm1, xmm0, offset)); \
117 _mm_storeu_si128((__m128i *)((u8 *)dst + 1 * 16), _mm_alignr_epi8(xmm2, xmm1, offset)); \
118 _mm_storeu_si128((__m128i *)((u8 *)dst + 2 * 16), _mm_alignr_epi8(xmm3, xmm2, offset)); \
119 _mm_storeu_si128((__m128i *)((u8 *)dst + 3 * 16), _mm_alignr_epi8(xmm4, xmm3, offset)); \
120 _mm_storeu_si128((__m128i *)((u8 *)dst + 4 * 16), _mm_alignr_epi8(xmm5, xmm4, offset)); \
121 _mm_storeu_si128((__m128i *)((u8 *)dst + 5 * 16), _mm_alignr_epi8(xmm6, xmm5, offset)); \
122 _mm_storeu_si128((__m128i *)((u8 *)dst + 6 * 16), _mm_alignr_epi8(xmm7, xmm6, offset)); \
123 _mm_storeu_si128((__m128i *)((u8 *)dst + 7 * 16), _mm_alignr_epi8(xmm8, xmm7, offset)); \
124 dst = (u8 *)dst + 128; \
127 len = ((len - 16 + offset) & 127) + 16 - offset; \
129 src = (const u8 *)src + tmp; \
130 dst = (u8 *)dst + tmp; \
131 if (len >= 32 + 16 - offset) { \
132 while (len >= 32 + 16 - offset) { \
133 xmm0 = _mm_loadu_si128((const __m128i *)((const u8 *)src - offset + 0 * 16)); \
135 xmm1 = _mm_loadu_si128((const __m128i *)((const u8 *)src - offset + 1 * 16)); \
136 xmm2 = _mm_loadu_si128((const __m128i *)((const u8 *)src - offset + 2 * 16)); \
137 src = (const u8 *)src + 32; \
138 _mm_storeu_si128((__m128i *)((u8 *)dst + 0 * 16), _mm_alignr_epi8(xmm1, xmm0, offset)); \
139 _mm_storeu_si128((__m128i *)((u8 *)dst + 1 * 16), _mm_alignr_epi8(xmm2, xmm1, offset)); \
140 dst = (u8 *)dst + 32; \
143 len = ((len - 16 + offset) & 31) + 16 - offset; \
145 src = (const u8 *)src + tmp; \
146 dst = (u8 *)dst + tmp; \
151 * Macro for copying unaligned block from one location to another,
152 * 47 bytes leftover maximum,
153 * locations should not overlap.
154 * Use switch here because the aligning instruction requires immediate value for shift count.
157 * - Load offset is <offset>, which must be within [1, 15]
158 * - For <src>, make sure <offset> bit backwards & <16 - offset> bit forwards are available for loading
159 * - <dst>, <src>, <len> must be variables
160 * - __m128i <xmm0> ~ <xmm8> used in CLIB_MVUNALIGN_LEFT47_IMM must be pre-defined
162 #define CLIB_MVUNALIGN_LEFT47(dst, src, len, offset) \
165 case 0x01: CLIB_MVUNALIGN_LEFT47_IMM(dst, src, n, 0x01); break; \
166 case 0x02: CLIB_MVUNALIGN_LEFT47_IMM(dst, src, n, 0x02); break; \
167 case 0x03: CLIB_MVUNALIGN_LEFT47_IMM(dst, src, n, 0x03); break; \
168 case 0x04: CLIB_MVUNALIGN_LEFT47_IMM(dst, src, n, 0x04); break; \
169 case 0x05: CLIB_MVUNALIGN_LEFT47_IMM(dst, src, n, 0x05); break; \
170 case 0x06: CLIB_MVUNALIGN_LEFT47_IMM(dst, src, n, 0x06); break; \
171 case 0x07: CLIB_MVUNALIGN_LEFT47_IMM(dst, src, n, 0x07); break; \
172 case 0x08: CLIB_MVUNALIGN_LEFT47_IMM(dst, src, n, 0x08); break; \
173 case 0x09: CLIB_MVUNALIGN_LEFT47_IMM(dst, src, n, 0x09); break; \
174 case 0x0A: CLIB_MVUNALIGN_LEFT47_IMM(dst, src, n, 0x0A); break; \
175 case 0x0B: CLIB_MVUNALIGN_LEFT47_IMM(dst, src, n, 0x0B); break; \
176 case 0x0C: CLIB_MVUNALIGN_LEFT47_IMM(dst, src, n, 0x0C); break; \
177 case 0x0D: CLIB_MVUNALIGN_LEFT47_IMM(dst, src, n, 0x0D); break; \
178 case 0x0E: CLIB_MVUNALIGN_LEFT47_IMM(dst, src, n, 0x0E); break; \
179 case 0x0F: CLIB_MVUNALIGN_LEFT47_IMM(dst, src, n, 0x0F); break; \
185 clib_memcpy (void *dst, const void *src, size_t n)
187 __m128i xmm0, xmm1, xmm2, xmm3, xmm4, xmm5, xmm6, xmm7, xmm8;
188 uword dstu = (uword) dst;
189 uword srcu = (uword) src;
195 * Copy less than 16 bytes
201 *(u8 *) dstu = *(const u8 *) srcu;
202 srcu = (uword) ((const u8 *) srcu + 1);
203 dstu = (uword) ((u8 *) dstu + 1);
207 *(u16 *) dstu = *(const u16 *) srcu;
208 srcu = (uword) ((const u16 *) srcu + 1);
209 dstu = (uword) ((u16 *) dstu + 1);
213 *(u32 *) dstu = *(const u32 *) srcu;
214 srcu = (uword) ((const u32 *) srcu + 1);
215 dstu = (uword) ((u32 *) dstu + 1);
219 *(u64 *) dstu = *(const u64 *) srcu;
225 * Fast way when copy size doesn't exceed 512 bytes
229 clib_mov16 ((u8 *) dst, (const u8 *) src);
230 clib_mov16 ((u8 *) dst - 16 + n, (const u8 *) src - 16 + n);
235 clib_mov32 ((u8 *) dst, (const u8 *) src);
236 clib_mov16 ((u8 *) dst - 16 + n, (const u8 *) src - 16 + n);
241 clib_mov32 ((u8 *) dst, (const u8 *) src);
242 clib_mov16 ((u8 *) dst + 32, (const u8 *) src + 32);
243 clib_mov16 ((u8 *) dst - 16 + n, (const u8 *) src - 16 + n);
248 goto COPY_BLOCK_128_BACK15;
255 clib_mov128 ((u8 *) dst, (const u8 *) src);
256 clib_mov128 ((u8 *) dst + 128, (const u8 *) src + 128);
257 src = (const u8 *) src + 256;
258 dst = (u8 *) dst + 256;
260 COPY_BLOCK_255_BACK15:
264 clib_mov128 ((u8 *) dst, (const u8 *) src);
265 src = (const u8 *) src + 128;
266 dst = (u8 *) dst + 128;
268 COPY_BLOCK_128_BACK15:
272 clib_mov64 ((u8 *) dst, (const u8 *) src);
273 src = (const u8 *) src + 64;
274 dst = (u8 *) dst + 64;
276 COPY_BLOCK_64_BACK15:
280 clib_mov32 ((u8 *) dst, (const u8 *) src);
281 src = (const u8 *) src + 32;
282 dst = (u8 *) dst + 32;
286 clib_mov16 ((u8 *) dst, (const u8 *) src);
287 clib_mov16 ((u8 *) dst - 16 + n, (const u8 *) src - 16 + n);
292 clib_mov16 ((u8 *) dst - 16 + n, (const u8 *) src - 16 + n);
298 * Make store aligned when copy size exceeds 512 bytes,
299 * and make sure the first 15 bytes are copied, because
300 * unaligned copy functions require up to 15 bytes
303 dstofss = 16 - ((uword) dst & 0x0F) + 16;
305 clib_mov32 ((u8 *) dst, (const u8 *) src);
306 src = (const u8 *) src + dstofss;
307 dst = (u8 *) dst + dstofss;
308 srcofs = ((uword) src & 0x0F);
316 * Copy 256-byte blocks
318 for (; n >= 256; n -= 256)
320 clib_mov256 ((u8 *) dst, (const u8 *) src);
321 dst = (u8 *) dst + 256;
322 src = (const u8 *) src + 256;
328 goto COPY_BLOCK_255_BACK15;
332 * For copy with unaligned load
334 CLIB_MVUNALIGN_LEFT47 (dst, src, n, srcofs);
339 goto COPY_BLOCK_64_BACK15;
343 #undef CLIB_MVUNALIGN_LEFT47_IMM
344 #undef CLIB_MVUNALIGN_LEFT47
346 #endif /* included_clib_memcpy_sse3_h */
350 * fd.io coding-style-patch-verification: ON
353 * eval: (c-set-style "gnu")