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NASM version of a SSE2 memcpy

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This commit is contained in:
Geoffrey McRae
2018-05-18 18:50:07 +10:00
parent ffec6c2014
commit 3c77c1eb2b
2 changed files with 334 additions and 18 deletions
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40
common/memcpySSE2.h
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@@ -26,6 +26,7 @@ Place, Suite 330, Boston, MA 02111-1307 USA
#include "debug.h"
#if defined(__GNUC___) || defined(__GNUG__)
#define OP(...) #__VA_ARGS__ "\n\t"
inline static void memcpySSE(void *dst, const void * src, size_t length)
@@ -79,7 +80,7 @@ inline static void memcpySSE(void *dst, const void * src, size_t length)
OP(add %[rem],%[end])
OP(jmp *%[end])
// jump table
// jump table
OP(vmovaps 0x60(%[src]),%%xmm0)
OP(vmovntdq %%xmm0,0x60(%[dst]))
OP(vmovaps 0x50(%[src]),%%xmm1)
@@ -95,28 +96,28 @@ inline static void memcpySSE(void *dst, const void * src, size_t length)
OP(vmovaps 0x00(%[src]),%%xmm6)
OP(vmovntdq %%xmm6,0x00(%[dst]))
// alignment as the previous two instructions are only 4 bytes
// alignment as the previous two instructions are only 4 bytes
OP(nop)
OP(nop)
// restore the registers
// restore the registers
OP(pop %[end])
OP(pop %[src])
OP(pop %[dst])
:
: [dst]"r" (dst),
[src]"r" (src),
[end]"c" (end),
[rem]"d" (rem)
: "xmm0",
"xmm1",
"xmm2",
"xmm3",
"xmm4",
"xmm5",
"xmm6",
"xmm7",
"memory"
:
: [dst]"r" (dst),
[src]"r" (src),
[end]"c" (end),
[rem]"d" (rem)
: "xmm0",
"xmm1",
"xmm2",
"xmm3",
"xmm4",
"xmm5",
"xmm6",
"xmm7",
"memory"
);
//copy any remaining bytes
@@ -126,4 +127,7 @@ inline static void memcpySSE(void *dst, const void * src, size_t length)
#else
memcpy(dst, src, length);
#endif
}
}
#else
extern "C" void __fastcall memcpySSE(void *dst, const void * src, size_t length);
#endif