mirror of
https://github.com/gnif/LookingGlass.git
synced 2024-11-10 00:28:20 +00:00
[common] more SSE improvements
* 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
This commit is contained in:
Geoffrey McRae
parent
778af24d82
commit
56f0a8525b
@ -26,176 +26,112 @@ Place, Suite 330, Boston, MA 02111-1307 USA
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#include "debug.h"
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#if defined(__GNUC__) || defined(__GNUG__)
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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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#define OP(...) #__VA_ARGS__ "\n\t"
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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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inline static void memcpySSE(void *dst, const void * src, size_t length)
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{
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#if !defined(NATIVE_MEMCPY) && (defined(__x86_64__) || defined(__i386__))
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if (length == 0 || dst == src)
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return;
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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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#ifdef __x86_64__
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const void * end = dst + (length & ~0xFF);
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size_t off = (15 - ((length & 0xFF) >> 4));
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off = (off < 8) ? off * 16 : 7 * 16 + (off - 7) * 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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const void * end = dst + (length & ~0x7F);
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const size_t off = (7 - ((length & 0x7F) >> 4)) * 10;
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#endif
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#ifdef __x86_64__
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#define REG "rax"
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#else
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#define REG "eax"
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#endif
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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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#ifdef __x86_64__
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"vmovaps 0x80(%[src]),%%xmm8 \n\t"
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"vmovaps 0x90(%[src]),%%xmm9 \n\t"
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"vmovaps 0xA0(%[src]),%%xmm10 \n\t"
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"vmovaps 0xB0(%[src]),%%xmm11 \n\t"
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"vmovaps 0xC0(%[src]),%%xmm12 \n\t"
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"vmovaps 0xD0(%[src]),%%xmm13 \n\t"
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"vmovaps 0xE0(%[src]),%%xmm14 \n\t"
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"vmovaps 0xF0(%[src]),%%xmm15 \n\t"
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#endif
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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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#ifdef __x86_64__
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"vmovntdq %%xmm8 ,0x80(%[dst]) \n\t"
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"vmovntdq %%xmm9 ,0x90(%[dst]) \n\t"
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"vmovntdq %%xmm10,0xA0(%[dst]) \n\t"
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"vmovntdq %%xmm11,0xB0(%[dst]) \n\t"
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"vmovntdq %%xmm12,0xC0(%[dst]) \n\t"
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"vmovntdq %%xmm13,0xD0(%[dst]) \n\t"
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"vmovntdq %%xmm14,0xE0(%[dst]) \n\t"
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"vmovntdq %%xmm15,0xF0(%[dst]) \n\t"
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"add $0x100,%[dst] \n\t"
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"add $0x100,%[src] \n\t"
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#else
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"add $0x80,%[dst] \n\t"
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"add $0x80,%[src] \n\t"
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#endif
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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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#ifdef __x86_64__
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"leaq (%%rip), %%rax\n\t"
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#else
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"call GetPC_%=\n\t"
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#endif
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"Offset_%=:\n\t"
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"add $(BlockTable_%= - Offset_%=), %%" REG "\n\t"
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"add %[off],%%" REG " \n\t"
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"jmp *%%" REG " \n\t"
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#ifdef __i386__
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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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#endif
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"BlockTable_%=:\n\t"
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#ifdef __x86_64__
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"vmovaps 0xE0(%[src]),%%xmm14 \n\t"
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"vmovntdq %%xmm14,0xE0(%[dst]) \n\t"
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"vmovaps 0xD0(%[src]),%%xmm13 \n\t"
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"vmovntdq %%xmm13,0xD0(%[dst]) \n\t"
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"vmovaps 0xC0(%[src]),%%xmm12 \n\t"
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"vmovntdq %%xmm12,0xC0(%[dst]) \n\t"
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"vmovaps 0xB0(%[src]),%%xmm11 \n\t"
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"vmovntdq %%xmm11,0xB0(%[dst]) \n\t"
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"vmovaps 0xA0(%[src]),%%xmm10 \n\t"
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"vmovntdq %%xmm10,0xA0(%[dst]) \n\t"
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"vmovaps 0x90(%[src]),%%xmm9 \n\t"
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"vmovntdq %%xmm9 ,0x90(%[dst]) \n\t"
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"vmovaps 0x80(%[src]),%%xmm8 \n\t"
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"vmovntdq %%xmm8 ,0x80(%[dst]) \n\t"
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"vmovaps 0x70(%[src]),%%xmm7 \n\t"
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"vmovntdq %%xmm7 ,0x70(%[dst]) \n\t"
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#endif
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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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: REG,
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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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#ifdef __x86_64__
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"xmm8",
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"xmm9",
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"xmm10",
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"xmm11",
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"xmm12",
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"xmm13",
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"xmm14",
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"xmm15",
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"rax",
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#else
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"eax",
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#endif
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"memory"
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);
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#undef REG
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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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#else
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memcpy(dst, src, length);
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#endif
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}
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#else
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extern "C" void memcpySSE(void *dst, const void * src, size_t length);
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#define memcpySSE memcpy
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#endif
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