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  1. /*
  2.  * Copyright © 2013 Intel Corporation
  3.  *
  4.  * Permission is hereby granted, free of charge, to any person obtaining a
  5.  * copy of this software and associated documentation files (the "Software"),
  6.  * to deal in the Software without restriction, including without limitation
  7.  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  8.  * and/or sell copies of the Software, and to permit persons to whom the
  9.  * Software is furnished to do so, subject to the following conditions:
  10.  *
  11.  * The above copyright notice and this permission notice (including the next
  12.  * paragraph) shall be included in all copies or substantial portions of the
  13.  * Software.
  14.  *
  15.  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16.  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17.  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18.  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19.  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20.  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  21.  * IN THE SOFTWARE.
  22.  *
  23.  * Authors:
  24.  *    Eric Anholt <eric@anholt.net>
  25.  *    Matt Turner <mattst88@gmail.com>
  26.  *
  27.  */
  28.  
  29. #include "main/macros.h"
  30. #include "main/streaming-load-memcpy.h"
  31. #include <smmintrin.h>
  32.  
  33. /* Copies memory from src to dst, using SSE 4.1's MOVNTDQA to get streaming
  34.  * read performance from uncached memory.
  35.  */
  36. void
  37. _mesa_streaming_load_memcpy(void *restrict dst, void *restrict src, size_t len)
  38. {
  39.    char *restrict d = dst;
  40.    char *restrict s = src;
  41.  
  42.    /* If dst and src are not co-aligned, fallback to memcpy(). */
  43.    if (((uintptr_t)d & 15) != ((uintptr_t)s & 15)) {
  44.       memcpy(d, s, len);
  45.       return;
  46.    }
  47.  
  48.    /* memcpy() the misaligned header. At the end of this if block, <d> and <s>
  49.     * are aligned to a 16-byte boundary or <len> == 0.
  50.     */
  51.    if ((uintptr_t)d & 15) {
  52.       uintptr_t bytes_before_alignment_boundary = 16 - ((uintptr_t)d & 15);
  53.       assert(bytes_before_alignment_boundary < 16);
  54.  
  55.       memcpy(d, s, MIN2(bytes_before_alignment_boundary, len));
  56.  
  57.       d = (char *)ALIGN((uintptr_t)d, 16);
  58.       s = (char *)ALIGN((uintptr_t)s, 16);
  59.       len -= MIN2(bytes_before_alignment_boundary, len);
  60.    }
  61.  
  62.    while (len >= 64) {
  63.       __m128i *dst_cacheline = (__m128i *)d;
  64.       __m128i *src_cacheline = (__m128i *)s;
  65.  
  66.       __m128i temp1 = _mm_stream_load_si128(src_cacheline + 0);
  67.       __m128i temp2 = _mm_stream_load_si128(src_cacheline + 1);
  68.       __m128i temp3 = _mm_stream_load_si128(src_cacheline + 2);
  69.       __m128i temp4 = _mm_stream_load_si128(src_cacheline + 3);
  70.  
  71.       _mm_store_si128(dst_cacheline + 0, temp1);
  72.       _mm_store_si128(dst_cacheline + 1, temp2);
  73.       _mm_store_si128(dst_cacheline + 2, temp3);
  74.       _mm_store_si128(dst_cacheline + 3, temp4);
  75.  
  76.       d += 64;
  77.       s += 64;
  78.       len -= 64;
  79.    }
  80.  
  81.    /* memcpy() the tail. */
  82.    if (len) {
  83.       memcpy(d, s, len);
  84.    }
  85. }
  86.