/*

Simple DirectMedia Layer

Copyright (C) 1997-2016 Sam Lantinga <slouken@libsdl.org>

This software is provided 'as-is', without any express or implied

warranty. In no event will the authors be held liable for any damages

arising from the use of this software.

Permission is granted to anyone to use this software for any purpose,

including commercial applications, and to alter it and redistribute it

freely, subject to the following restrictions:

1. The origin of this software must not be misrepresented; you must not

claim that you wrote the original software. If you use this software

in a product, an acknowledgment in the product documentation would be

appreciated but is not required.

2. Altered source versions must be plainly marked as such, and must not be

misrepresented as being the original software.

3. This notice may not be removed or altered from any source distribution.

*/

#include "../SDL_internal.h"

#include "SDL_video.h"

#include "SDL_blit.h"

#include "SDL_blit_copy.h"

#ifdef __SSE__

/* This assumes 16-byte aligned src and dst */

static SDL_INLINE void

SDL_memcpySSE(Uint8 * dst, const Uint8 * src, int len)

{

int i;

__m128 values[4];

for (i = len / 64; i--;) {

_mm_prefetch(src, _MM_HINT_NTA);

values[0] = *(__m128 *) (src + 0);

values[1] = *(__m128 *) (src + 16);

values[2] = *(__m128 *) (src + 32);

values[3] = *(__m128 *) (src + 48);

_mm_stream_ps((float *) (dst + 0), values[0]);

_mm_stream_ps((float *) (dst + 16), values[1]);

_mm_stream_ps((float *) (dst + 32), values[2]);

_mm_stream_ps((float *) (dst + 48), values[3]);

src += 64;

dst += 64;

}

if (len & 63)

SDL_memcpy(dst, src, len & 63);

}

#endif /* __SSE__ */

#ifdef __MMX__

#ifdef _MSC_VER

#pragma warning(disable:4799)

#endif

static SDL_INLINE void

SDL_memcpyMMX(Uint8 * dst, const Uint8 * src, int len)

{

const int remain = (len & 63);

int i;

__m64* d64 = (__m64*)dst;

__m64* s64 = (__m64*)src;

for(i= len / 64; i--;) {

d64[0] = s64[0];

d64[1] = s64[1];

d64[2] = s64[2];

d64[3] = s64[3];

d64[4] = s64[4];

d64[5] = s64[5];

d64[6] = s64[6];

d64[7] = s64[7];

d64 += 8;

s64 += 8;

}

if (remain)

{

const int skip = len - remain;

SDL_memcpy(dst + skip, src + skip, remain);

}

}

#endif /* __MMX__ */

void

SDL_BlitCopy(SDL_BlitInfo * info)

{

SDL_bool overlap;

Uint8 *src, *dst;

int w, h;

int srcskip, dstskip;

w = info->dst_w * info->dst_fmt->BytesPerPixel;

h = info->dst_h;

src = info->src;

dst = info->dst;

srcskip = info->src_pitch;

dstskip = info->dst_pitch;

/* Properly handle overlapping blits */

if (src < dst) {

overlap = (dst < (src + h*srcskip));

} else {

overlap = (src < (dst + h*dstskip));

}

if (overlap) {

while (h--) {

SDL_memmove(dst, src, w);

src += srcskip;

dst += dstskip;

}

return;

}

#ifdef __SSE__

if (SDL_HasSSE() &&

!((uintptr_t) src & 15) && !(srcskip & 15) &&

!((uintptr_t) dst & 15) && !(dstskip & 15)) {

while (h--) {

SDL_memcpySSE(dst, src, w);

src += srcskip;

dst += dstskip;

}

return;

}

#endif

#ifdef __MMX__

if (SDL_HasMMX() && !(srcskip & 7) && !(dstskip & 7)) {

while (h--) {

SDL_memcpyMMX(dst, src, w);

src += srcskip;

dst += dstskip;

}

_mm_empty();

return;

}

#endif

while (h--) {

SDL_memcpy(dst, src, w);

src += srcskip;

dst += dstskip;

}

}

/* vi: set ts=4 sw=4 expandtab: */