- applied SSE patch by Nick Kurshev

git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@410 b3059339-0415-0410-9bf9-f77b7e298cf2

1 files changed, 44 insertions, 47 deletions

diff --git a/libvo/fastmemcpy.h b/libvo/fastmemcpy.h
index 1f0a41853e..a383107314 100644
--- a/libvo/fastmemcpy.h
+++ b/libvo/fastmemcpy.h
@@ -27,60 +27,57 @@ inline static void * fast_memcpy(void * to, const void * from, unsigned len)
 	  len&=63;
 	  
 	__asm__ __volatile__ (
-		"1: prefetchnta (%0)\n"		/* This set is 28 bytes */
-		"   prefetchnta 64(%0)\n"
-		"   prefetchnta 128(%0)\n"
-		"   prefetchnta 192(%0)\n"
-		"   prefetchnta 256(%0)\n"
-#if 0		
-		"2:  \n"
-		".section .fixup, \"ax\"\n"
-		"3: movw $0x1AEB, 1b\n"	/* jmp on 26 bytes */
-		"   jmp 2b\n"
-		".previous\n"
-		".section __ex_table,\"a\"\n"
-		"	.align 4\n"
-		"	.long 1b, 3b\n"
-		".previous"
-#endif		
+		"prefetchnta (%0)\n"
+		"prefetchnta 64(%0)\n"
+		"prefetchnta 128(%0)\n"
+		"prefetchnta 192(%0)\n"
+		"prefetchnta 256(%0)\n"
 		: : "r" (from) );
-		
-	
+        /*
+           This algorithm is top effective when the code consequently
+           reads and writes blocks which have size of cache line.
+           Size of cache line is processor-dependent.
+           It will, however, be a minimum of 32 bytes on any processors.
+           It would be better to have a number of instructions which
+           perform reading and writing to be multiple to a number of
+           processor's decoders, but it's not always possible.
+        */
 	for(; i>0; i--)
 	{
 		__asm__ __volatile__ (
-		"1:  prefetchnta 320(%0)\n"
-		"2:  movq (%0), %%mm0\n"
-		"  movq 8(%0), %%mm1\n"
-		"  movq 16(%0), %%mm2\n"
-		"  movq 24(%0), %%mm3\n"
-		"  movntq %%mm0, (%1)\n"
-		"  movntq %%mm1, 8(%1)\n"
-		"  movntq %%mm2, 16(%1)\n"
-		"  movntq %%mm3, 24(%1)\n"
-		"  movq 32(%0), %%mm0\n"
-		"  movq 40(%0), %%mm1\n"
-		"  movq 48(%0), %%mm2\n"
-		"  movq 56(%0), %%mm3\n"
-		"  movntq %%mm0, 32(%1)\n"
-		"  movntq %%mm1, 40(%1)\n"
-		"  movntq %%mm2, 48(%1)\n"
-		"  movntq %%mm3, 56(%1)\n"
-#if 0		
-		".section .fixup, \"ax\"\n"
-		"3: movw $0x05EB, 1b\n"	/* jmp on 5 bytes */
-		"   jmp 2b\n"
-		".previous\n"
-		".section __ex_table,\"a\"\n"
-		"	.align 4\n"
-		"	.long 1b, 3b\n"
-		".previous"
-#endif		
-		: : "r" (from), "r" (to) : "memory");
+		"prefetchnta 320(%0)\n"
+#ifdef HAVE_SSE /* Only P3 (may be Cyrix3) */
+		"movups (%0), %%xmm0\n"
+		"movups 16(%0), %%xmm1\n"
+		"movntps %%xmm0, (%1)\n"
+		"movntps %%xmm1, 16(%1)\n"
+		"movups 32(%0), %%xmm0\n"
+		"movups 48(%0), %%xmm1\n"
+		"movntps %%xmm0, 32(%1)\n"
+		"movntps %%xmm1, 48(%1)\n"
+#else /* Only K7 (may be other) */
+		"movq (%0), %%mm0\n"
+		"movq 8(%0), %%mm1\n"
+		"movq 16(%0), %%mm2\n"
+		"movq 24(%0), %%mm3\n"
+		"movntq %%mm0, (%1)\n"
+		"movntq %%mm1, 8(%1)\n"
+		"movntq %%mm2, 16(%1)\n"
+		"movntq %%mm3, 24(%1)\n"
+		"movq 32(%0), %%mm0\n"
+		"movq 40(%0), %%mm1\n"
+		"movq 48(%0), %%mm2\n"
+		"movq 56(%0), %%mm3\n"
+		"movntq %%mm0, 32(%1)\n"
+		"movntq %%mm1, 40(%1)\n"
+		"movntq %%mm2, 48(%1)\n"
+		"movntq %%mm3, 56(%1)\n"
+#endif
+		:: "r" (from), "r" (to) : "memory");
 		from+=64;
 		to+=64;
 	}
-	        __asm__ __volatile__ ("emms":::"memory");
+		__asm__ __volatile__ ("emms":::"memory");
 	}
 	/*
 	 *	Now do the tail of the block