mirror of
https://github.com/gnif/LookingGlass.git
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56f0a8525b
* 32bit inlined is slow for only large copies, warn if memcpySSE is used when it shouldn't be. * Removed 64bit memcpySSE as native inlined is faster See: https://stackoverflow.com/questions/50422510/why-is-i386-memcpy-slow-on-x86-64
137 lines
4.2 KiB
C
137 lines
4.2 KiB
C
/*
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KVMGFX Client - A KVM Client for VGA Passthrough
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Copyright (C) 2017 Geoffrey McRae <geoff@hostfission.com>
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https://looking-glass.hostfission.com
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This program is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free Software
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Foundation; either version 2 of the License, or (at your option) any later
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version.
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This program is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
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PARTICULAR PURPOSE. See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along with
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this program; if not, write to the Free Software Foundation, Inc., 59 Temple
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Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#pragma once
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#include <stdbool.h>
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#include <stdint.h>
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#include <string.h>
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#include <tmmintrin.h>
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#include <immintrin.h>
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#include "debug.h"
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#if defined(NATIVE_MEMCPY)
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#define memcpySSE memcpy
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#elif defined(MSVC)
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extern "C" void memcpySSE(void *dst, const void * src, size_t length);
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#elif (defined(__GNUC__) || defined(__GNUG__)) && defined(__i386__)
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inline static void memcpySSE(void *dst, const void * src, size_t length)
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{
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if (length == 0 || dst == src)
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return;
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// copies under 1MB are faster with the inlined memcpy
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// tell the dev to use that instead
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if (length < 1048576)
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{
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static bool smallBufferWarn = false;
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if (!smallBufferWarn)
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{
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DEBUG_WARN("Do not use memcpySSE for copies under 1MB in size!");
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smallBufferWarn = true;
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}
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memcpy(dst, src, length);
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return;
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}
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const void * end = dst + (length & ~0x7F);
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const size_t off = (7 - ((length & 0x7F) >> 4)) * 10;
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__asm__ __volatile__ (
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"cmp %[dst],%[end] \n\t"
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"je Remain_%= \n\t"
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// perform SIMD block copy
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"loop_%=: \n\t"
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"vmovaps 0x00(%[src]),%%xmm0 \n\t"
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"vmovaps 0x10(%[src]),%%xmm1 \n\t"
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"vmovaps 0x20(%[src]),%%xmm2 \n\t"
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"vmovaps 0x30(%[src]),%%xmm3 \n\t"
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"vmovaps 0x40(%[src]),%%xmm4 \n\t"
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"vmovaps 0x50(%[src]),%%xmm5 \n\t"
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"vmovaps 0x60(%[src]),%%xmm6 \n\t"
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"vmovaps 0x70(%[src]),%%xmm7 \n\t"
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"vmovntdq %%xmm0 ,0x00(%[dst]) \n\t"
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"vmovntdq %%xmm1 ,0x10(%[dst]) \n\t"
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"vmovntdq %%xmm2 ,0x20(%[dst]) \n\t"
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"vmovntdq %%xmm3 ,0x30(%[dst]) \n\t"
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"vmovntdq %%xmm4 ,0x40(%[dst]) \n\t"
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"vmovntdq %%xmm5 ,0x50(%[dst]) \n\t"
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"vmovntdq %%xmm6 ,0x60(%[dst]) \n\t"
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"vmovntdq %%xmm7 ,0x70(%[dst]) \n\t"
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"add $0x80,%[dst] \n\t"
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"add $0x80,%[src] \n\t"
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"cmp %[dst],%[end] \n\t"
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"jne loop_%= \n\t"
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"Remain_%=: \n\t"
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// copy any remaining 16 byte blocks
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"call GetPC_%=\n\t"
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"Offset_%=:\n\t"
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"add $(BlockTable_%= - Offset_%=), %%eax \n\t"
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"add %[off],%%eax \n\t"
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"jmp *%%eax \n\t"
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"GetPC_%=:\n\t"
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"mov (%%esp), %%eax \n\t"
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"ret \n\t"
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"BlockTable_%=:\n\t"
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"vmovaps 0x60(%[src]),%%xmm6 \n\t"
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"vmovntdq %%xmm6 ,0x60(%[dst]) \n\t"
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"vmovaps 0x50(%[src]),%%xmm5 \n\t"
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"vmovntdq %%xmm5 ,0x50(%[dst]) \n\t"
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"vmovaps 0x40(%[src]),%%xmm4 \n\t"
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"vmovntdq %%xmm4 ,0x40(%[dst]) \n\t"
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"vmovaps 0x30(%[src]),%%xmm3 \n\t"
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"vmovntdq %%xmm3 ,0x30(%[dst]) \n\t"
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"vmovaps 0x20(%[src]),%%xmm2 \n\t"
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"vmovntdq %%xmm2 ,0x20(%[dst]) \n\t"
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"vmovaps 0x10(%[src]),%%xmm1 \n\t"
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"vmovntdq %%xmm1 ,0x10(%[dst]) \n\t"
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"vmovaps 0x00(%[src]),%%xmm0 \n\t"
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"vmovntdq %%xmm0 ,0x00(%[dst]) \n\t"
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"nop\n\t"
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"nop\n\t"
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: [dst]"+r" (dst),
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[src]"+r" (src)
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: [off]"r" (off),
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[end]"r" (end)
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: "eax",
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"xmm0",
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"xmm1",
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"xmm2",
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"xmm3",
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"xmm4",
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"xmm5",
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"xmm6",
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"xmm7",
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"memory"
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);
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//copy any remaining bytes
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for(size_t i = (length & 0xF); i; --i)
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((uint8_t *)dst)[length - i] =
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((uint8_t *)src)[length - i];
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}
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#else
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#define memcpySSE memcpy
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#endif |