--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/video/SDL_blit_copy.c	Wed Aug 15 08:21:10 2007 +0000
@@ -0,0 +1,164 @@
+/*
+    SDL - Simple DirectMedia Layer
+    Copyright (C) 1997-2006 Sam Lantinga
+
+    This library is free software; you can redistribute it and/or
+    modify it under the terms of the GNU Lesser General Public
+    License as published by the Free Software Foundation; either
+    version 2.1 of the License, or (at your option) any later version.
+
+    This library is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+    Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public
+    License along with this library; if not, write to the Free Software
+    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+
+    Sam Lantinga
+    slouken@libsdl.org
+*/
+#include "SDL_config.h"
+
+#include "SDL_video.h"
+#include "SDL_blit.h"
+
+/* The MMX/SSE intrinsics don't give access to specific registers for
+   the most memory parallelism, so we'll use GCC inline assembly here...
+*/
+#ifndef __GNUC__
+#undef __MMX__
+#undef __SSE__
+#endif
+
+#ifdef __MMX__
+static __inline__ void
+SDL_memcpyMMX(Uint8 *dst, const Uint8 *src, int len)
+{
+    int i;
+
+    for (i = len / 64; i--;) {
+        __asm__ __volatile__ (
+        "prefetchnta (%0)\n"
+        "movq (%0), %%mm0\n"
+        "movq 8(%0), %%mm1\n"
+        "movq 16(%0), %%mm2\n"
+        "movq 24(%0), %%mm3\n"
+        "movq 32(%0), %%mm4\n"
+        "movq 40(%0), %%mm5\n"
+        "movq 48(%0), %%mm6\n"
+        "movq 56(%0), %%mm7\n"
+        "movntq %%mm0, (%1)\n"
+        "movntq %%mm1, 8(%1)\n"
+        "movntq %%mm2, 16(%1)\n"
+        "movntq %%mm3, 24(%1)\n"
+        "movntq %%mm4, 32(%1)\n"
+        "movntq %%mm5, 40(%1)\n"
+        "movntq %%mm6, 48(%1)\n"
+        "movntq %%mm7, 56(%1)\n"
+        :: "r" (src), "r" (dst) : "memory");
+        src += 64;
+        dst += 64;
+    }
+    if (len & 63)
+        SDL_memcpy(dst, src, len & 63);
+}
+#endif /* __MMX__ */
+
+#ifdef __SSE__
+static __inline__ void
+SDL_memcpySSE(Uint8 *dst, const Uint8 *src, int len)
+{
+    int i;
+
+    for (i = len / 64; i--;) {
+        __asm__ __volatile__ (
+        "prefetchnta (%0)\n"
+        "movaps (%0), %%xmm0\n"
+        "movaps 16(%0), %%xmm1\n"
+        "movaps 32(%0), %%xmm2\n"
+        "movaps 48(%0), %%xmm3\n"
+        "movntps %%xmm0, (%1)\n"
+        "movntps %%xmm1, 16(%1)\n"
+        "movntps %%xmm2, 32(%1)\n"
+        "movntps %%xmm3, 48(%1)\n"
+        :: "r" (src), "r" (dst) : "memory");
+        src += 64;
+        dst += 64;
+    }
+    if (len & 63)
+        SDL_memcpy(dst, src, len & 63);
+}
+#endif /* __SSE__ */
+
+void
+SDL_BlitCopy(SDL_BlitInfo * info)
+{
+    Uint8 *src, *dst;
+    int w, h;
+    int srcskip, dstskip;
+
+    w = info->d_width * info->dst->BytesPerPixel;
+    h = info->d_height;
+    src = info->s_pixels;
+    dst = info->d_pixels;
+    srcskip = w + info->s_skip;
+    dstskip = w + info->d_skip;
+
+#ifdef __SSE__
+    if (SDL_HasSSE() && !((uintptr_t)src & 15) && !((uintptr_t)dst & 15)) {
+        while (h--) {
+            SDL_memcpySSE(dst, src, w);
+            src += srcskip;
+            dst += dstskip;
+        }
+        return;
+    }
+#endif
+
+#ifdef __MMX__
+    if (SDL_HasMMX() && !((uintptr_t)src & 7) && !((uintptr_t)dst & 7)) {
+        while (h--) {
+            SDL_memcpyMMX(dst, src, w);
+            src += srcskip;
+            dst += dstskip;
+        }
+        __asm__ __volatile__("	emms\n"::);
+        return;
+    }
+#endif
+
+    while (h--) {
+        SDL_memcpy(dst, src, w);
+        src += srcskip;
+        dst += dstskip;
+    }
+}
+
+void
+SDL_BlitCopyOverlap(SDL_BlitInfo * info)
+{
+    Uint8 *src, *dst;
+    int w, h;
+    int skip;
+
+    w = info->d_width * info->dst->BytesPerPixel;
+    h = info->d_height;
+    src = info->s_pixels;
+    dst = info->d_pixels;
+    skip = w + info->s_skip;
+    if ((dst < src) || (dst >= (src + h*skip))) {
+        SDL_BlitCopy(info);
+    } else {
+        src += ((h - 1) * skip);
+        dst += ((h - 1) * skip);
+        while (h--) {
+            SDL_revcpy(dst, src, w);
+            src -= skip;
+            dst -= skip;
+        }
+    }
+}
+
+/* vi: set ts=4 sw=4 expandtab: */