93 lines
3.1 KiB
C
93 lines
3.1 KiB
C
/*
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* Copyright © 2013 Intel Corporation
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*
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* Authors:
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* Eric Anholt <eric@anholt.net>
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* Matt Turner <mattst88@gmail.com>
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*
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*/
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#include "main/macros.h"
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#include "util/streaming-load-memcpy.h"
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#include "x86/common_x86_asm.h"
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#ifdef USE_SSE41
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#include <smmintrin.h>
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#endif
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/* Copies memory from src to dst, using SSE 4.1's MOVNTDQA to get streaming
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* read performance from uncached memory.
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*/
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void
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util_streaming_load_memcpy(void *restrict dst, void *restrict src, size_t len)
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{
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char *restrict d = dst;
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char *restrict s = src;
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#ifdef USE_SSE41
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/* If dst and src are not co-aligned, or if SSE4.1 is not present, fallback to memcpy(). */
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if (((uintptr_t)d & 15) != ((uintptr_t)s & 15) || !cpu_has_sse4_1) {
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memcpy(d, s, len);
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return;
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}
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/* memcpy() the misaligned header. At the end of this if block, <d> and <s>
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* are aligned to a 16-byte boundary or <len> == 0.
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*/
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if ((uintptr_t)d & 15) {
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uintptr_t bytes_before_alignment_boundary = 16 - ((uintptr_t)d & 15);
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assert(bytes_before_alignment_boundary < 16);
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memcpy(d, s, MIN2(bytes_before_alignment_boundary, len));
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d = (char *)ALIGN((uintptr_t)d, 16);
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s = (char *)ALIGN((uintptr_t)s, 16);
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len -= MIN2(bytes_before_alignment_boundary, len);
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}
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if (len >= 64)
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_mm_mfence();
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while (len >= 64) {
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__m128i *dst_cacheline = (__m128i *)d;
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__m128i *src_cacheline = (__m128i *)s;
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__m128i temp1 = _mm_stream_load_si128(src_cacheline + 0);
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__m128i temp2 = _mm_stream_load_si128(src_cacheline + 1);
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__m128i temp3 = _mm_stream_load_si128(src_cacheline + 2);
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__m128i temp4 = _mm_stream_load_si128(src_cacheline + 3);
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_mm_store_si128(dst_cacheline + 0, temp1);
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_mm_store_si128(dst_cacheline + 1, temp2);
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_mm_store_si128(dst_cacheline + 2, temp3);
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_mm_store_si128(dst_cacheline + 3, temp4);
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d += 64;
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s += 64;
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len -= 64;
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}
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#endif
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/* memcpy() the tail. */
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if (len) {
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memcpy(d, s, len);
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}
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}
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