MMX & MMX2 optimizations (MMX2 is buggy and commented out)

32, 24, 16, 15 bit support in C (only 32 & 16 tested)
32, 16 bit support in mmx (16 with dithering)
ranges of some variables changed so mmx likes them more


git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@2233 b3059339-0415-0410-9bf9-f77b7e298cf2

2 files changed, 1126 insertions, 72 deletions

diff --git a/postproc/swscale.c b/postproc/swscale.c
index a1082a7bbe..b3746598d3 100644
--- a/postproc/swscale.c
+++ b/postproc/swscale.c
@@ -1,9 +1,18 @@
 
 // Software scaling and colorspace conversion routines for MPlayer
 
+#include <inttypes.h>
+#include "../config.h"
+
+#undef HAVE_MMX2 //code is buggy
+//#undef HAVE_MMX
+
+#define RET 0xC3 //near return opcode
+
 // temporary storage for 4 yuv lines:
-static unsigned int pix_buf_y[4][2048];
-static unsigned int pix_buf_uv[2][2048*2];
+// 16bit for now (mmx likes it more compact)
+static uint16_t pix_buf_y[4][2048];
+static uint16_t pix_buf_uv[2][2048*2];
 
 // clipping helper table for C implementations:
 static unsigned char clip_table[768];
@@ -15,6 +24,31 @@ static    int yuvtab_0c92[256];
 static    int yuvtab_1a1e[256];
 static    int yuvtab_40cf[256];
 
+static uint64_t yCoeff=    0x2568256825682568LL;
+static uint64_t ubCoeff=   0x3343334333433343LL;
+static uint64_t vrCoeff=   0x40cf40cf40cf40cfLL;
+static uint64_t ugCoeff=   0xE5E2E5E2E5E2E5E2LL;
+static uint64_t vgCoeff=   0xF36EF36EF36EF36ELL;
+static uint64_t w80=       0x0080008000800080LL;
+static uint64_t w10=       0x0010001000100010LL;
+
+static uint64_t b16Dither= 0x0004000400040004LL;
+static uint64_t b16Dither1=0x0004000400040004LL;
+static uint64_t b16Dither2=0x0602060206020602LL;
+static uint64_t g16Dither= 0x0002000200020002LL;
+static uint64_t g16Dither1=0x0002000200020002LL;
+static uint64_t g16Dither2=0x0301030103010301LL;
+
+static uint64_t b16Mask=   0x001F001F001F001FLL;
+static uint64_t g16Mask=   0x07E007E007E007E0LL;
+static uint64_t r16Mask=   0xF800F800F800F800LL;
+static uint64_t temp0;
+
+static uint8_t funnyYCode[10000];
+static uint8_t funnyUVCode[10000];
+
+
+
 // *** bilinear scaling and yuv->rgb conversion of yv12 slices:
 // *** Note: it's called multiple times while decoding a frame, first time y==0
 // *** Designed to upscale, but may work for downscale too.
@@ -33,25 +67,149 @@ unsigned int s_xinc2=s_xinc>>1;
 static int s_srcypos;
 static int s_ypos;
 static int s_last_ypos;
+static int static_dstw;
+
+#ifdef HAVE_MMX2
+static int old_dstw= -1;
+static int old_s_xinc= -1;
+#endif
+
+s_xinc&= -2; //clear last bit or uv and y might be shifted relative to each other
 
   if(y==0){
       s_srcypos=-2*s_yinc;
       s_ypos=-2;
       s_last_ypos=-2;
+#ifdef HAVE_MMX2
+// cant downscale !!!
+	if(old_s_xinc != s_xinc || old_dstw!=dstw)
+	{
+		uint8_t *fragment;
+		int imm8OfPShufW1;
+		int imm8OfPShufW2;
+		int fragmentLength;
+
+		int xpos, xx, xalpha, i;
+
+		old_s_xinc= s_xinc;
+		old_dstw= dstw;
+
+		static_dstw= dstw;
+
+		// create an optimized horizontal scaling routine
+
+		//code fragment
+
+//		fragmentLength=0;
+//		printf("%d, %d\n", fragmentLength,imm8OfPShufW1);
+
+		asm volatile(
+			"jmp 9f				\n\t"
+		// Begin
+			"0:				\n\t"
+			"movq (%%esi, %%ebx), %%mm0	\n\t" //FIXME Alignment
+			"movq %%mm0, %%mm1		\n\t"
+			"psrlq $8, %%mm0		\n\t"
+			"punpcklbw %%mm7, %%mm1	\n\t"
+			"punpcklbw %%mm7, %%mm0	\n\t"
+			"pshufw $0xFF, %%mm1, %%mm1	\n\t"
+			"1:				\n\t"
+			"pshufw $0xFF, %%mm0, %%mm0	\n\t"
+			"2:				\n\t"
+			"psubw %%mm1, %%mm0		\n\t"
+			"psraw $1, %%mm0		\n\t"
+			"pmullw %%mm2, %%mm0		\n\t"
+			"psllw $7, %%mm1		\n\t"
+			"paddw %%mm1, %%mm0		\n\t"
+			"movq %%mm0, (%%edi, %%eax)	\n\t"
+			"paddb %%mm6, %%mm2		\n\t" // 2*alpha += xpos&0xFF
+
+			"addb %%ch, %%cl		\n\t" //2*xalpha += (4*s_xinc)&0xFF
+			"adcl %%edx, %%ebx		\n\t" //xx+= (4*s_xinc)>>8 + carry
+
+			"addl $8, %%eax			\n\t"
+		// End
+			"9:				\n\t"
+//		"int $3\n\t"
+			"leal 0b, %0			\n\t"
+			"leal 1b, %1			\n\t"
+			"leal 2b, %2			\n\t"
+			"decl %1			\n\t"
+			"decl %2			\n\t"
+			"subl %0, %1			\n\t"
+			"subl %0, %2			\n\t"
+			"leal 9b, %3			\n\t"
+			"subl %0, %3			\n\t"
+			:"=r" (fragment), "=r" (imm8OfPShufW1), "=r" (imm8OfPShufW2),
+			 "=r" (fragmentLength)
+		);
+
+		xpos= xx=xalpha= 0;
+		//FIXME choose size and or xinc so that they fit exactly
+		for(i=0; i<dstw/8; i++)
+		{
+			int xx=xpos>>8;
+
+			if((i&3) == 0)
+			{
+				int a=0;
+				int b=((xpos+s_xinc)>>8) - xx;
+				int c=((xpos+s_xinc*2)>>8) - xx;
+				int d=((xpos+s_xinc*3)>>8) - xx;
+
+				memcpy(funnyYCode + fragmentLength*i/4, fragment, fragmentLength);
+
+				funnyYCode[fragmentLength*i/4 + imm8OfPShufW1]=
+				funnyYCode[fragmentLength*i/4 + imm8OfPShufW2]=
+					a | (b<<2) | (c<<4) | (d<<6);
+
+				funnyYCode[fragmentLength*(i+4)/4]= RET;
+			}
+			xpos+=s_xinc;
+		}
+
+		xpos= xx=xalpha= 0;
+		//FIXME choose size and or xinc so that they fit exactly
+		for(i=0; i<dstw/8; i++)
+		{
+			int xx=xpos>>8;
+
+			if((i&3) == 0)
+			{
+				int a=0;
+				int b=((xpos+s_xinc2)>>8) - xx;
+				int c=((xpos+s_xinc2*2)>>8) - xx;
+				int d=((xpos+s_xinc2*3)>>8) - xx;
+
+				memcpy(funnyUVCode + fragmentLength*i/4, fragment, fragmentLength);
+
+				funnyUVCode[fragmentLength*i/4 + imm8OfPShufW1]=
+				funnyUVCode[fragmentLength*i/4 + imm8OfPShufW2]=
+					a | (b<<2) | (c<<4) | (d<<6);
+
+				funnyUVCode[fragmentLength*(i+4)/4]= RET;
+			}
+			xpos+=s_xinc2;
+		}
+//		funnyCode[0]= RET;
+
+
+	}
+#endif
   } // reset counters
-  
+
   while(1){
     unsigned char *dest=dstptr+dststride*s_ypos;
     int y0=2+(s_srcypos>>16);
     int y1=1+(s_srcypos>>17);
-    int yalpha=(s_srcypos&0xFFFF)>>8;
-    int yalpha1=yalpha^255;
-    int uvalpha=((s_srcypos>>1)&0xFFFF)>>8;
-    int uvalpha1=uvalpha^255;
-    unsigned int *buf0=pix_buf_y[y0&3];
-    unsigned int *buf1=pix_buf_y[((y0+1)&3)];
-    unsigned int *uvbuf0=pix_buf_uv[y1&1];
-    unsigned int *uvbuf1=pix_buf_uv[(y1&1)^1];
+    int yalpha=(s_srcypos&0xFFFF)>>7;
+    int yalpha1=yalpha^511;
+    int uvalpha=((s_srcypos>>1)&0xFFFF)>>7;
+    int uvalpha1=uvalpha^511;
+    uint16_t *buf0=pix_buf_y[y0&3];
+    uint16_t *buf1=pix_buf_y[((y0+1)&3)];
+    uint16_t *uvbuf0=pix_buf_uv[y1&1];
+    uint16_t *uvbuf1=pix_buf_uv[(y1&1)^1];
     int i;
 
     if(y0>=y+h) break;
@@ -64,54 +222,423 @@ static int s_last_ypos;
       s_last_ypos=y0;
       // *** horizontal scale Y line to temp buffer
       // this loop should be rewritten in MMX assembly!!!!
+#ifdef HAVE_MMX2
+	asm volatile(
+		"pxor %%mm7, %%mm7		\n\t"
+		"pxor %%mm2, %%mm2		\n\t" // 2*xalpha
+		"movd %5, %%mm6			\n\t" // s_xinc&0xFF
+		"punpcklwd %%mm6, %%mm6		\n\t"
+		"punpcklwd %%mm6, %%mm6		\n\t"
+		"movq %%mm6, %%mm2		\n\t"
+		"psllq $16, %%mm2		\n\t"
+		"paddb %%mm6, %%mm2		\n\t"
+		"psllq $16, %%mm2		\n\t"
+		"paddb %%mm6, %%mm2		\n\t"
+		"psllq $16, %%mm2		\n\t" //0,t,2t,3t		t=s_xinc&0xFF
+		"movq %%mm2, temp0		\n\t"
+		"movd %4, %%mm6			\n\t" //(s_xinc*4)&0xFF
+		"punpcklwd %%mm6, %%mm6		\n\t"
+		"punpcklwd %%mm6, %%mm6		\n\t"
+		"xorl %%eax, %%eax		\n\t" // i
+		"xorl %%ebx, %%ebx		\n\t" // xx
+		"movl %0, %%esi			\n\t" // src
+		"movl %1, %%edi			\n\t" // buf1
+		"movl %3, %%edx			\n\t" // (s_xinc*4)>>8
+		"xorl %%ecx, %%ecx		\n\t"
+		"movb %4, %%ch			\n\t" // (s_xinc*4)&0xFF
+//	"int $3\n\t"
+		"call funnyYCode			\n\t"
+		"movq temp0, %%mm2		\n\t"
+		"xorb %%cl, %%cl		\n\t"
+		"call funnyYCode			\n\t"
+		"movq temp0, %%mm2		\n\t"
+		"xorb %%cl, %%cl		\n\t"
+		"call funnyYCode			\n\t"
+		"movq temp0, %%mm2		\n\t"
+		"xorb %%cl, %%cl		\n\t"
+		"call funnyYCode			\n\t"
+		"movq temp0, %%mm2		\n\t"
+		"xorb %%cl, %%cl		\n\t"
+		"call funnyYCode			\n\t"
+		"movq temp0, %%mm2		\n\t"
+		"xorb %%cl, %%cl		\n\t"
+		"call funnyYCode			\n\t"
+		"movq temp0, %%mm2		\n\t"
+		"xorb %%cl, %%cl		\n\t"
+		"call funnyYCode			\n\t"
+		"movq temp0, %%mm2		\n\t"
+		"xorb %%cl, %%cl		\n\t"
+		"call funnyYCode			\n\t"
+		:: "m" (src), "m" (buf1), "m" (dstw), "m" ((s_xinc*4)>>8),
+		  "m" ((s_xinc*4)&0xFF), "m" (s_xinc&0xFF)
+		: "%eax", "%ebx", "%ecx", "%edx", "%esi", "%edi"
+	);
+
+#elif defined (ARCH_X86)
+	//NO MMX just normal asm ... FIXME try/write funny MMX2 variant
+	//FIXME add prefetch
+	asm volatile(
+		"xorl %%eax, %%eax		\n\t" // i
+		"xorl %%ebx, %%ebx		\n\t" // xx
+		"xorl %%ecx, %%ecx		\n\t" // 2*xalpha
+		"1:				\n\t"
+		"movzbl  (%0, %%ebx), %%edi	\n\t" //src[xx]
+		"movzbl 1(%0, %%ebx), %%esi	\n\t" //src[xx+1]
+		"subl %%edi, %%esi		\n\t" //src[xx+1] - src[xx]
+		"imull %%ecx, %%esi		\n\t" //(src[xx+1] - src[xx])*2*xalpha
+		"shll $8, %%edi			\n\t"
+		"addl %%edi, %%esi		\n\t" //src[xx+1]*2*xalpha + src[xx]*(1-2*xalpha)
+		"shrl $1, %%esi			\n\t"
+		"movw %%si, (%1, %%eax, 2)	\n\t"
+		"addb %4, %%cl			\n\t" //2*xalpha += s_xinc&0xFF
+		"adcl %3, %%ebx			\n\t" //xx+= s_xinc>>8 + carry
+
+		"movzbl (%0, %%ebx), %%edi	\n\t" //src[xx]
+		"movzbl 1(%0, %%ebx), %%esi	\n\t" //src[xx+1]
+		"subl %%edi, %%esi		\n\t" //src[xx+1] - src[xx]
+		"imull %%ecx, %%esi		\n\t" //(src[xx+1] - src[xx])*2*xalpha
+		"shll $8, %%edi			\n\t"
+		"addl %%edi, %%esi		\n\t" //src[xx+1]*2*xalpha + src[xx]*(1-2*xalpha)
+		"shrl $1, %%esi			\n\t"
+		"movw %%si, 2(%1, %%eax, 2)	\n\t"
+		"addb %4, %%cl			\n\t" //2*xalpha += s_xinc&0xFF
+		"adcl %3, %%ebx			\n\t" //xx+= s_xinc>>8 + carry
+
+
+		"addl $2, %%eax			\n\t"
+		"cmpl %2, %%eax			\n\t"
+		" jb 1b				\n\t"
+
+
+		:: "r" (src), "r" (buf1), "m" (dstw), "m" (s_xinc>>8), "m" (s_xinc&0xFF)
+		: "%eax", "%ebx", "%ecx", "%edi", "%esi"
+		);
+#else
       for(i=0;i<dstw;i++){
 	register unsigned int xx=xpos>>8;
-        register unsigned int xalpha=xpos&0xFF;
-	buf1[i]=(src[xx]*(xalpha^255)+src[xx+1]*xalpha);
+        register unsigned int xalpha=(xpos&0xFF)>>1;
+	buf1[i]=(src[xx]*(xalpha^127)+src[xx+1]*xalpha);
 	xpos+=s_xinc;
       }
+#endif
       // *** horizontal scale U and V lines to temp buffer
       if(!(y0&1)){
         unsigned char *src1=srcptr[1]+(y1-y/2)*stride[1];
         unsigned char *src2=srcptr[2]+(y1-y/2)*stride[2];
         xpos=0;
         // this loop should be rewritten in MMX assembly!!!!
+#ifdef HAVE_MMX2
+	asm volatile(
+		"pxor %%mm7, %%mm7		\n\t"
+		"pxor %%mm2, %%mm2		\n\t" // 2*xalpha
+		"movd %5, %%mm6			\n\t" // s_xinc&0xFF
+		"punpcklwd %%mm6, %%mm6		\n\t"
+		"punpcklwd %%mm6, %%mm6		\n\t"
+		"movq %%mm6, %%mm2		\n\t"
+		"psllq $16, %%mm2		\n\t"
+		"paddb %%mm6, %%mm2		\n\t"
+		"psllq $16, %%mm2		\n\t"
+		"paddb %%mm6, %%mm2		\n\t"
+		"psllq $16, %%mm2		\n\t" //0,t,2t,3t		t=s_xinc&0xFF
+		"movq %%mm2, temp0		\n\t"
+		"movd %4, %%mm6			\n\t" //(s_xinc*4)&0xFF
+		"punpcklwd %%mm6, %%mm6		\n\t"
+		"punpcklwd %%mm6, %%mm6		\n\t"
+		"xorl %%eax, %%eax		\n\t" // i
+		"xorl %%ebx, %%ebx		\n\t" // xx
+		"movl %0, %%esi			\n\t" // src
+		"movl %1, %%edi			\n\t" // buf1
+		"movl %3, %%edx			\n\t" // (s_xinc*4)>>8
+		"xorl %%ecx, %%ecx		\n\t"
+		"movb %4, %%ch			\n\t" // (s_xinc*4)&0xFF
+//	"int $3\n\t"
+		"call funnyUVCode			\n\t"
+		"movq temp0, %%mm2		\n\t"
+		"xorb %%cl, %%cl		\n\t"
+		"call funnyUVCode			\n\t"
+		"movq temp0, %%mm2		\n\t"
+		"xorb %%cl, %%cl		\n\t"
+		"call funnyUVCode			\n\t"
+		"movq temp0, %%mm2		\n\t"
+		"xorb %%cl, %%cl		\n\t"
+		"call funnyUVCode			\n\t"
+		"movq temp0, %%mm2		\n\t"
+		"xorb %%cl, %%cl		\n\t"
+		"call funnyUVCode			\n\t"
+		"movq temp0, %%mm2		\n\t"
+		"xorb %%cl, %%cl		\n\t"
+		"call funnyUVCode			\n\t"
+		"movq temp0, %%mm2		\n\t"
+		"xorb %%cl, %%cl		\n\t"
+		"call funnyUVCode			\n\t"
+		"movq temp0, %%mm2		\n\t"
+		"xorb %%cl, %%cl		\n\t"
+		"call funnyUVCode			\n\t"
+
+		"xorl %%eax, %%eax		\n\t" // i
+		"xorl %%ebx, %%ebx		\n\t" // xx
+		"movl %6, %%esi			\n\t" // src
+		"movl %1, %%edi			\n\t" // buf1
+		"addl $4096, %%edi		\n\t"
+
+		"call funnyUVCode			\n\t"
+		"movq temp0, %%mm2		\n\t"
+		"xorb %%cl, %%cl		\n\t"
+		"call funnyUVCode			\n\t"
+		"movq temp0, %%mm2		\n\t"
+		"xorb %%cl, %%cl		\n\t"
+		"call funnyUVCode			\n\t"
+		"movq temp0, %%mm2		\n\t"
+		"xorb %%cl, %%cl		\n\t"
+		"call funnyUVCode			\n\t"
+		"movq temp0, %%mm2		\n\t"
+		"xorb %%cl, %%cl		\n\t"
+		"call funnyUVCode			\n\t"
+		"movq temp0, %%mm2		\n\t"
+		"xorb %%cl, %%cl		\n\t"
+		"call funnyUVCode			\n\t"
+		"movq temp0, %%mm2		\n\t"
+		"xorb %%cl, %%cl		\n\t"
+		"call funnyUVCode			\n\t"
+		"movq temp0, %%mm2		\n\t"
+		"xorb %%cl, %%cl		\n\t"
+		"call funnyUVCode			\n\t"
+
+		:: "m" (src1), "m" (uvbuf1), "m" (dstw), "m" ((s_xinc2*4)>>8),
+		  "m" ((s_xinc2*4)&0xFF), "m" (s_xinc2&0xFF), "m" (src2)
+		: "%eax", "%ebx", "%ecx", "%edx", "%esi", "%edi"
+	);
+
+#elif defined (ARCH_X86)
+	//NO MMX just normal asm ... FIXME try/write funny MMX2 variant
+	asm volatile(
+		"xorl %%eax, %%eax		\n\t" // i
+		"xorl %%ebx, %%ebx		\n\t" // xx
+		"xorl %%ecx, %%ecx		\n\t" // 2*xalpha
+		"1:				\n\t"
+		"movzbl  (%0, %%ebx), %%edi	\n\t" //src[xx]
+		"movzbl 1(%0, %%ebx), %%esi	\n\t" //src[xx+1]
+		"subl %%edi, %%esi		\n\t" //src[xx+1] - src[xx]
+		"imull %%ecx, %%esi		\n\t" //(src[xx+1] - src[xx])*2*xalpha
+		"shll $8, %%edi			\n\t"
+		"addl %%edi, %%esi		\n\t" //src[xx+1]*2*xalpha + src[xx]*(1-2*xalpha)
+		"movl %1, %%edi			\n\t"
+		"shrl $1, %%esi			\n\t"
+		"movw %%si, (%%edi, %%eax, 2)	\n\t"
+
+		"movzbl  (%5, %%ebx), %%edi	\n\t" //src[xx]
+		"movzbl 1(%5, %%ebx), %%esi	\n\t" //src[xx+1]
+		"subl %%edi, %%esi		\n\t" //src[xx+1] - src[xx]
+		"imull %%ecx, %%esi		\n\t" //(src[xx+1] - src[xx])*2*xalpha
+		"shll $8, %%edi			\n\t"
+		"addl %%edi, %%esi		\n\t" //src[xx+1]*2*xalpha + src[xx]*(1-2*xalpha)
+		"movl %1, %%edi			\n\t"
+		"shrl $1, %%esi			\n\t"
+		"movw %%si, 4096(%%edi, %%eax, 2)\n\t"
+
+		"addb %4, %%cl			\n\t" //2*xalpha += s_xinc&0xFF
+		"adcl %3, %%ebx			\n\t" //xx+= s_xinc>>8 + carry
+		"addl $1, %%eax			\n\t"
+		"cmpl %2, %%eax			\n\t"
+		" jb 1b				\n\t"
+
+
+		:: "r" (src1), "m" (uvbuf1), "m" (dstw), "m" (s_xinc2>>8), "m" (s_xinc2&0xFF),
+		"r" (src2)
+		: "%eax", "%ebx", "%ecx", "%edi", "%esi"
+		);
+#else
         for(i=0;i<dstw;i++){
 	  register unsigned int xx=xpos>>8;
-          register unsigned int xalpha=xpos&0xFF;
-	  uvbuf1[i]=(src1[xx]*(xalpha^255)+src1[xx+1]*xalpha);
-	  uvbuf1[i+2048]=(src2[xx]*(xalpha^255)+src2[xx+1]*xalpha);
+          register unsigned int xalpha=(xpos&0xFF)>>1;
+	  uvbuf1[i]=(src1[xx]*(xalpha^127)+src1[xx+1]*xalpha);
+	  uvbuf1[i+2048]=(src2[xx]*(xalpha^127)+src2[xx+1]*xalpha);
 	  xpos+=s_xinc2;
         }
+#endif
       }
       if(!y0) continue;
     }
 
-    // this loop should be rewritten in MMX assembly!!!!
     // Note1: this code can be resticted to n*8 (or n*16) width lines to simplify optimization...
+    // Re: Note1: ok n*4 for now
     // Note2: instead of using lookup tabs, mmx version could do the multiply...
+    // Re: Note2: yep
     // Note3: maybe we should make separated 15/16, 24 and 32bpp version of this:
-    for(i=0;i<dstw;i++){
-	// vertical linear interpolation && yuv2rgb in a single step:
-	int Y=yuvtab_2568[((buf0[i]*yalpha1+buf1[i]*yalpha)>>16)];
-	int U=((uvbuf0[i]*uvalpha1+uvbuf1[i]*uvalpha)>>16);
-	int V=((uvbuf0[i+2048]*uvalpha1+uvbuf1[i+2048]*uvalpha)>>16);
-#if 1
-	// 24/32 bpp
-	dest[0]=clip_table[((Y + yuvtab_3343[U]) >>13)];
-	dest[1]=clip_table[((Y + yuvtab_0c92[V] + yuvtab_1a1e[U]) >>13)];
-	dest[2]=clip_table[((Y + yuvtab_40cf[V]) >>13)];
+    // Re: done (32 & 16) and 16 has dithering :) but 16 is untested
+#ifdef HAVE_MMX
+	//FIXME write lq version with less uv ...
+	//FIXME reorder / optimize
+	if(dstbpp == 4)
+	{
+		asm volatile(
+
+#define YSCALEYUV2RGB \
+		"pxor %%mm7, %%mm7		\n\t"\
+		"movd %6, %%mm6			\n\t" /*yalpha1*/\
+		"punpcklwd %%mm6, %%mm6		\n\t"\
+		"punpcklwd %%mm6, %%mm6		\n\t"\
+		"movd %7, %%mm5			\n\t" /*uvalpha1*/\
+		"punpcklwd %%mm5, %%mm5		\n\t"\
+		"punpcklwd %%mm5, %%mm5		\n\t"\
+		"xorl %%eax, %%eax		\n\t"\
+		"1:				\n\t"\
+		"movq (%0, %%eax, 2), %%mm0	\n\t" /*buf0[eax]*/\
+		"movq (%1, %%eax, 2), %%mm1	\n\t" /*buf1[eax]*/\
+		"psubw %%mm1, %%mm0		\n\t" /* buf0[eax] - buf1[eax]*/\
+		"pmulhw %%mm6, %%mm0		\n\t" /* (buf0[eax] - buf1[eax])yalpha1>>16*/\
+		"psraw $7, %%mm1		\n\t" /* buf0[eax] - buf1[eax] >>7*/\
+		"paddw %%mm0, %%mm1		\n\t" /* buf0[eax]yalpha1 + buf1[eax](1-yalpha1) >>16*/\
+		"psubw w10, %%mm1		\n\t" /* Y-16*/\
+		"psllw $3, %%mm1		\n\t" /* (y-16)*8*/\
+		"pmulhw yCoeff, %%mm1		\n\t"\
+\
+		"movq (%2, %%eax,2), %%mm2	\n\t" /* uvbuf0[eax]*/\
+		"movq (%3, %%eax,2), %%mm3	\n\t" /* uvbuf1[eax]*/\
+		"psubw %%mm3, %%mm2		\n\t" /* uvbuf0[eax] - uvbuf1[eax]*/\
+		"pmulhw %%mm5, %%mm2		\n\t" /* (uvbuf0[eax] - uvbuf1[eax])uvalpha1>>16*/\
+		"psraw $7, %%mm3		\n\t" /* uvbuf0[eax] - uvbuf1[eax] >>7*/\
+		"paddw %%mm2, %%mm3		\n\t" /* uvbuf0[eax]uvalpha1 - uvbuf1[eax](1-uvalpha1)*/\
+		"psubw w80, %%mm3		\n\t" /* (U-128)*/\
+		"psllw $3, %%mm3		\n\t" /*(U-128)8*/\
+\
+		"movq 4096(%2, %%eax,2), %%mm4	\n\t" /* uvbuf0[eax+2048]*/\
+		"movq 4096(%3, %%eax,2), %%mm0	\n\t" /* uvbuf1[eax+2048]*/\
+		"psubw %%mm0, %%mm4		\n\t" /* uvbuf0[eax+2048] - uvbuf1[eax+2048]*/\
+		"pmulhw %%mm5, %%mm4		\n\t" /* (uvbuf0[eax+2048] - uvbuf1[eax+2048])uvalpha1>>16*/\
+		"psraw $7, %%mm0		\n\t" /* uvbuf0[eax+2048] - uvbuf1[eax+2048] >>7*/\
+		"paddw %%mm4, %%mm0		\n\t" /* uvbuf0[eax+2048]uvalpha1 - uvbuf1[eax+2048](1-uvalpha1)*/\
+		"psubw w80, %%mm0		\n\t" /* (V-128)*/\
+		"psllw $3, %%mm0		\n\t" /* (V-128)8*/\
+\
+		"movq %%mm3, %%mm2		\n\t" /* (U-128)8*/\
+		"pmulhw ubCoeff, %%mm3		\n\t"\
+		"paddw %%mm1, %%mm3		\n\t" /* B*/\
+\
+		"movq %%mm0, %%mm4		\n\t" /* (V-128)8*/\
+		"pmulhw vrCoeff, %%mm0		\n\t"\
+		"paddw %%mm1, %%mm0		\n\t" /* R*/\
+\
+		"pmulhw ugCoeff, %%mm2		\n\t"\
+		"pmulhw vgCoeff, %%mm4		\n\t"\
+		"paddw %%mm4, %%mm2		\n\t"\
+		"paddw %%mm2, %%mm1		\n\t" /* G*/\
+\
+		"packuswb %%mm3, %%mm3		\n\t"\
+		"packuswb %%mm0, %%mm0		\n\t"\
+		"packuswb %%mm1, %%mm1		\n\t"
+
+YSCALEYUV2RGB
+		"punpcklbw %%mm1, %%mm3		\n\t" // BGBGBGBG
+		"punpcklbw %%mm7, %%mm0		\n\t" // R0R0R0R0
+
+		"movq %%mm3, %%mm1		\n\t"
+		"punpcklwd %%mm0, %%mm3		\n\t" // BGR0BGR0
+		"punpckhwd %%mm0, %%mm1		\n\t" // BGR0BGR0
+#ifdef HAVE_MMX2
+		"movntq %%mm3, (%4, %%eax, 4)	\n\t"
+		"movntq %%mm1, 8(%4, %%eax, 4)	\n\t"
 #else
-	unsigned short *d=dest;
-	unsigned int b=clip_table[((Y + yuvtab_3343[U]) >>13)];
-	unsigned int g=clip_table[((Y + yuvtab_0c92[V] + yuvtab_1a1e[U]) >>13)];
-	unsigned int r=clip_table[((Y + yuvtab_40cf[V]) >>13)];
-//	d[0]=((r>>3)<<10)|((g>>3)<<5)|((b>>3)); // 15bpp
-	d[0]=((r>>3)<<11)|((g>>2)<<5)|((b>>3)); // 16bpp
+		"movq %%mm3, (%4, %%eax, 4)	\n\t"
+		"movq %%mm1, 8(%4, %%eax, 4)	\n\t"
 #endif
-	dest+=dstbpp;
-    }
-  
+		"addl $4, %%eax			\n\t"
+		"cmpl %5, %%eax			\n\t"
+		" jb 1b				\n\t"
+
+
+		:: "r" (buf0), "r" (buf1), "r" (uvbuf0), "r" (uvbuf1), "r" (dest), "m" (dstw),
+		"m" (yalpha1), "m" (uvalpha1)
+		: "%eax"
+		);
+	}
+	else if(dstbpp==2)
+	{
+		asm volatile(
+
+YSCALEYUV2RGB
+		"paddusb g16Dither, %%mm1	\n\t"
+		"paddusb b16Dither, %%mm0	\n\t"
+		"paddusb b16Dither, %%mm3	\n\t"
+		"punpcklbw %%mm7, %%mm1		\n\t" // 0G0G0G0G
+		"punpcklbw %%mm7, %%mm3		\n\t" // 0B0B0B0B
+		"punpcklbw %%mm7, %%mm0		\n\t" // 0R0R0R0R
+
+		"psrlw $3, %%mm3		\n\t"
+		"psllw $3, %%mm1		\n\t"
+		"psllw $8, %%mm0		\n\t"
+		"pand g16Mask, %%mm1		\n\t"
+		"pand r16Mask, %%mm0		\n\t"
+
+		"por %%mm3, %%mm1		\n\t"
+		"por %%mm1, %%mm0		\n\t"
+#ifdef HAVE_MMX2
+		"movntq %%mm0, (%4, %%eax, 2)	\n\t"
+#else
+		"movq %%mm0, (%4, %%eax, 2)	\n\t"
+#endif
+		"addl $4, %%eax			\n\t"
+		"cmpl %5, %%eax			\n\t"
+		" jb 1b				\n\t"
+
+		:: "r" (buf0), "r" (buf1), "r" (uvbuf0), "r" (uvbuf1), "r" (dest), "m" (dstw),
+		"m" (yalpha1), "m" (uvalpha1)
+		: "%eax"
+		);
+	}
+#else
+	if(dstbpp==4 || dstbpp==3)
+	{
+		for(i=0;i<dstw;i++){
+			// vertical linear interpolation && yuv2rgb in a single step:
+			int Y=yuvtab_2568[((buf0[i]*yalpha1+buf1[i]*yalpha)>>16)];
+			int U=((uvbuf0[i]*uvalpha1+uvbuf1[i]*uvalpha)>>16);
+			int V=((uvbuf0[i+2048]*uvalpha1+uvbuf1[i+2048]*uvalpha)>>16);
+			dest[0]=clip_table[((Y + yuvtab_3343[U]) >>13)];
+			dest[1]=clip_table[((Y + yuvtab_0c92[V] + yuvtab_1a1e[U]) >>13)];
+			dest[2]=clip_table[((Y + yuvtab_40cf[V]) >>13)];
+			dest+=dstbpp;
+		}
+	}
+	else if(dstbpp==2) //16bit
+	{
+		for(i=0;i<dstw;i++){
+			// vertical linear interpolation && yuv2rgb in a single step:
+			int Y=yuvtab_2568[((buf0[i]*yalpha1+buf1[i]*yalpha)>>16)];
+			int U=((uvbuf0[i]*uvalpha1+uvbuf1[i]*uvalpha)>>16);
+			int V=((uvbuf0[i+2048]*uvalpha1+uvbuf1[i+2048]*uvalpha)>>16);
+
+			((uint16_t*)dest)[0] =
+				(clip_table[((Y + yuvtab_3343[U]) >>13)]>>3) |
+				(clip_table[((Y + yuvtab_0c92[V] + yuvtab_1a1e[U]) >>13)]<<3)&0x07E0 |
+				(clip_table[((Y + yuvtab_40cf[V]) >>13)]<<8)&0xF800;
+			dest+=dstbpp;
+		}
+	}
+	else if(dstbpp==2) //15bit FIXME how do i figure out if its 15 or 16?
+	{
+		for(i=0;i<dstw;i++){
+			// vertical linear interpolation && yuv2rgb in a single step:
+			int Y=yuvtab_2568[((buf0[i]*yalpha1+buf1[i]*yalpha)>>16)];
+			int U=((uvbuf0[i]*uvalpha1+uvbuf1[i]*uvalpha)>>16);
+			int V=((uvbuf0[i+2048]*uvalpha1+uvbuf1[i+2048]*uvalpha)>>16);
+
+			((uint16_t*)dest)[0] =
+				(clip_table[((Y + yuvtab_3343[U]) >>13)]>>3) |
+				(clip_table[((Y + yuvtab_0c92[V] + yuvtab_1a1e[U]) >>13)]<<2)&0x03E0 |
+				(clip_table[((Y + yuvtab_40cf[V]) >>13)]<<7)&0x7C00;
+			dest+=dstbpp;
+		}
+	}
+#endif
+
+	b16Dither= b16Dither1;
+	b16Dither1= b16Dither2;
+	b16Dither2= b16Dither;
+
+	g16Dither= g16Dither1;
+	g16Dither1= g16Dither2;
+	g16Dither2= g16Dither;
   }
 
 }
diff --git a/postproc/swscale_template.c b/postproc/swscale_template.c
index a1082a7bbe..b3746598d3 100644
--- a/postproc/swscale_template.c
+++ b/postproc/swscale_template.c
@@ -1,9 +1,18 @@
 
 // Software scaling and colorspace conversion routines for MPlayer
 
+#include <inttypes.h>
+#include "../config.h"
+
+#undef HAVE_MMX2 //code is buggy
+//#undef HAVE_MMX
+
+#define RET 0xC3 //near return opcode
+
 // temporary storage for 4 yuv lines:
-static unsigned int pix_buf_y[4][2048];
-static unsigned int pix_buf_uv[2][2048*2];
+// 16bit for now (mmx likes it more compact)
+static uint16_t pix_buf_y[4][2048];
+static uint16_t pix_buf_uv[2][2048*2];
 
 // clipping helper table for C implementations:
 static unsigned char clip_table[768];
@@ -15,6 +24,31 @@ static    int yuvtab_0c92[256];
 static    int yuvtab_1a1e[256];
 static    int yuvtab_40cf[256];
 
+static uint64_t yCoeff=    0x2568256825682568LL;
+static uint64_t ubCoeff=   0x3343334333433343LL;
+static uint64_t vrCoeff=   0x40cf40cf40cf40cfLL;
+static uint64_t ugCoeff=   0xE5E2E5E2E5E2E5E2LL;
+static uint64_t vgCoeff=   0xF36EF36EF36EF36ELL;
+static uint64_t w80=       0x0080008000800080LL;
+static uint64_t w10=       0x0010001000100010LL;
+
+static uint64_t b16Dither= 0x0004000400040004LL;
+static uint64_t b16Dither1=0x0004000400040004LL;
+static uint64_t b16Dither2=0x0602060206020602LL;
+static uint64_t g16Dither= 0x0002000200020002LL;
+static uint64_t g16Dither1=0x0002000200020002LL;
+static uint64_t g16Dither2=0x0301030103010301LL;
+
+static uint64_t b16Mask=   0x001F001F001F001FLL;
+static uint64_t g16Mask=   0x07E007E007E007E0LL;
+static uint64_t r16Mask=   0xF800F800F800F800LL;
+static uint64_t temp0;
+
+static uint8_t funnyYCode[10000];
+static uint8_t funnyUVCode[10000];
+
+
+
 // *** bilinear scaling and yuv->rgb conversion of yv12 slices:
 // *** Note: it's called multiple times while decoding a frame, first time y==0
 // *** Designed to upscale, but may work for downscale too.
@@ -33,25 +67,149 @@ unsigned int s_xinc2=s_xinc>>1;
 static int s_srcypos;
 static int s_ypos;
 static int s_last_ypos;
+static int static_dstw;
+
+#ifdef HAVE_MMX2
+static int old_dstw= -1;
+static int old_s_xinc= -1;
+#endif
+
+s_xinc&= -2; //clear last bit or uv and y might be shifted relative to each other
 
   if(y==0){
       s_srcypos=-2*s_yinc;
       s_ypos=-2;
       s_last_ypos=-2;
+#ifdef HAVE_MMX2
+// cant downscale !!!
+	if(old_s_xinc != s_xinc || old_dstw!=dstw)
+	{
+		uint8_t *fragment;
+		int imm8OfPShufW1;
+		int imm8OfPShufW2;
+		int fragmentLength;
+
+		int xpos, xx, xalpha, i;
+
+		old_s_xinc= s_xinc;
+		old_dstw= dstw;
+
+		static_dstw= dstw;
+
+		// create an optimized horizontal scaling routine
+
+		//code fragment
+
+//		fragmentLength=0;
+//		printf("%d, %d\n", fragmentLength,imm8OfPShufW1);
+
+		asm volatile(
+			"jmp 9f				\n\t"
+		// Begin
+			"0:				\n\t"
+			"movq (%%esi, %%ebx), %%mm0	\n\t" //FIXME Alignment
+			"movq %%mm0, %%mm1		\n\t"
+			"psrlq $8, %%mm0		\n\t"
+			"punpcklbw %%mm7, %%mm1	\n\t"
+			"punpcklbw %%mm7, %%mm0	\n\t"
+			"pshufw $0xFF, %%mm1, %%mm1	\n\t"
+			"1:				\n\t"
+			"pshufw $0xFF, %%mm0, %%mm0	\n\t"
+			"2:				\n\t"
+			"psubw %%mm1, %%mm0		\n\t"
+			"psraw $1, %%mm0		\n\t"
+			"pmullw %%mm2, %%mm0		\n\t"
+			"psllw $7, %%mm1		\n\t"
+			"paddw %%mm1, %%mm0		\n\t"
+			"movq %%mm0, (%%edi, %%eax)	\n\t"
+			"paddb %%mm6, %%mm2		\n\t" // 2*alpha += xpos&0xFF
+
+			"addb %%ch, %%cl		\n\t" //2*xalpha += (4*s_xinc)&0xFF
+			"adcl %%edx, %%ebx		\n\t" //xx+= (4*s_xinc)>>8 + carry
+
+			"addl $8, %%eax			\n\t"
+		// End
+			"9:				\n\t"
+//		"int $3\n\t"
+			"leal 0b, %0			\n\t"
+			"leal 1b, %1			\n\t"
+			"leal 2b, %2			\n\t"
+			"decl %1			\n\t"
+			"decl %2			\n\t"
+			"subl %0, %1			\n\t"
+			"subl %0, %2			\n\t"
+			"leal 9b, %3			\n\t"
+			"subl %0, %3			\n\t"
+			:"=r" (fragment), "=r" (imm8OfPShufW1), "=r" (imm8OfPShufW2),
+			 "=r" (fragmentLength)
+		);
+
+		xpos= xx=xalpha= 0;
+		//FIXME choose size and or xinc so that they fit exactly
+		for(i=0; i<dstw/8; i++)
+		{
+			int xx=xpos>>8;
+
+			if((i&3) == 0)
+			{
+				int a=0;
+				int b=((xpos+s_xinc)>>8) - xx;
+				int c=((xpos+s_xinc*2)>>8) - xx;
+				int d=((xpos+s_xinc*3)>>8) - xx;
+
+				memcpy(funnyYCode + fragmentLength*i/4, fragment, fragmentLength);
+
+				funnyYCode[fragmentLength*i/4 + imm8OfPShufW1]=
+				funnyYCode[fragmentLength*i/4 + imm8OfPShufW2]=
+					a | (b<<2) | (c<<4) | (d<<6);
+
+				funnyYCode[fragmentLength*(i+4)/4]= RET;
+			}
+			xpos+=s_xinc;
+		}
+
+		xpos= xx=xalpha= 0;
+		//FIXME choose size and or xinc so that they fit exactly
+		for(i=0; i<dstw/8; i++)
+		{
+			int xx=xpos>>8;
+
+			if((i&3) == 0)
+			{
+				int a=0;
+				int b=((xpos+s_xinc2)>>8) - xx;
+				int c=((xpos+s_xinc2*2)>>8) - xx;
+				int d=((xpos+s_xinc2*3)>>8) - xx;
+
+				memcpy(funnyUVCode + fragmentLength*i/4, fragment, fragmentLength);
+
+				funnyUVCode[fragmentLength*i/4 + imm8OfPShufW1]=
+				funnyUVCode[fragmentLength*i/4 + imm8OfPShufW2]=
+					a | (b<<2) | (c<<4) | (d<<6);
+
+				funnyUVCode[fragmentLength*(i+4)/4]= RET;
+			}
+			xpos+=s_xinc2;
+		}
+//		funnyCode[0]= RET;
+
+
+	}
+#endif
   } // reset counters
-  
+
   while(1){
     unsigned char *dest=dstptr+dststride*s_ypos;
     int y0=2+(s_srcypos>>16);
     int y1=1+(s_srcypos>>17);
-    int yalpha=(s_srcypos&0xFFFF)>>8;
-    int yalpha1=yalpha^255;
-    int uvalpha=((s_srcypos>>1)&0xFFFF)>>8;
-    int uvalpha1=uvalpha^255;
-    unsigned int *buf0=pix_buf_y[y0&3];
-    unsigned int *buf1=pix_buf_y[((y0+1)&3)];
-    unsigned int *uvbuf0=pix_buf_uv[y1&1];
-    unsigned int *uvbuf1=pix_buf_uv[(y1&1)^1];
+    int yalpha=(s_srcypos&0xFFFF)>>7;
+    int yalpha1=yalpha^511;
+    int uvalpha=((s_srcypos>>1)&0xFFFF)>>7;
+    int uvalpha1=uvalpha^511;
+    uint16_t *buf0=pix_buf_y[y0&3];
+    uint16_t *buf1=pix_buf_y[((y0+1)&3)];
+    uint16_t *uvbuf0=pix_buf_uv[y1&1];
+    uint16_t *uvbuf1=pix_buf_uv[(y1&1)^1];
     int i;
 
     if(y0>=y+h) break;
@@ -64,54 +222,423 @@ static int s_last_ypos;
       s_last_ypos=y0;
       // *** horizontal scale Y line to temp buffer
       // this loop should be rewritten in MMX assembly!!!!
+#ifdef HAVE_MMX2
+	asm volatile(
+		"pxor %%mm7, %%mm7		\n\t"
+		"pxor %%mm2, %%mm2		\n\t" // 2*xalpha
+		"movd %5, %%mm6			\n\t" // s_xinc&0xFF
+		"punpcklwd %%mm6, %%mm6		\n\t"
+		"punpcklwd %%mm6, %%mm6		\n\t"
+		"movq %%mm6, %%mm2		\n\t"
+		"psllq $16, %%mm2		\n\t"
+		"paddb %%mm6, %%mm2		\n\t"
+		"psllq $16, %%mm2		\n\t"
+		"paddb %%mm6, %%mm2		\n\t"
+		"psllq $16, %%mm2		\n\t" //0,t,2t,3t		t=s_xinc&0xFF
+		"movq %%mm2, temp0		\n\t"
+		"movd %4, %%mm6			\n\t" //(s_xinc*4)&0xFF
+		"punpcklwd %%mm6, %%mm6		\n\t"
+		"punpcklwd %%mm6, %%mm6		\n\t"
+		"xorl %%eax, %%eax		\n\t" // i
+		"xorl %%ebx, %%ebx		\n\t" // xx
+		"movl %0, %%esi			\n\t" // src
+		"movl %1, %%edi			\n\t" // buf1
+		"movl %3, %%edx			\n\t" // (s_xinc*4)>>8
+		"xorl %%ecx, %%ecx		\n\t"
+		"movb %4, %%ch			\n\t" // (s_xinc*4)&0xFF
+//	"int $3\n\t"
+		"call funnyYCode			\n\t"
+		"movq temp0, %%mm2		\n\t"
+		"xorb %%cl, %%cl		\n\t"
+		"call funnyYCode			\n\t"
+		"movq temp0, %%mm2		\n\t"
+		"xorb %%cl, %%cl		\n\t"
+		"call funnyYCode			\n\t"
+		"movq temp0, %%mm2		\n\t"
+		"xorb %%cl, %%cl		\n\t"
+		"call funnyYCode			\n\t"
+		"movq temp0, %%mm2		\n\t"
+		"xorb %%cl, %%cl		\n\t"
+		"call funnyYCode			\n\t"
+		"movq temp0, %%mm2		\n\t"
+		"xorb %%cl, %%cl		\n\t"
+		"call funnyYCode			\n\t"
+		"movq temp0, %%mm2		\n\t"
+		"xorb %%cl, %%cl		\n\t"
+		"call funnyYCode			\n\t"
+		"movq temp0, %%mm2		\n\t"
+		"xorb %%cl, %%cl		\n\t"
+		"call funnyYCode			\n\t"
+		:: "m" (src), "m" (buf1), "m" (dstw), "m" ((s_xinc*4)>>8),
+		  "m" ((s_xinc*4)&0xFF), "m" (s_xinc&0xFF)
+		: "%eax", "%ebx", "%ecx", "%edx", "%esi", "%edi"
+	);
+
+#elif defined (ARCH_X86)
+	//NO MMX just normal asm ... FIXME try/write funny MMX2 variant
+	//FIXME add prefetch
+	asm volatile(
+		"xorl %%eax, %%eax		\n\t" // i
+		"xorl %%ebx, %%ebx		\n\t" // xx
+		"xorl %%ecx, %%ecx		\n\t" // 2*xalpha
+		"1:				\n\t"
+		"movzbl  (%0, %%ebx), %%edi	\n\t" //src[xx]
+		"movzbl 1(%0, %%ebx), %%esi	\n\t" //src[xx+1]
+		"subl %%edi, %%esi		\n\t" //src[xx+1] - src[xx]
+		"imull %%ecx, %%esi		\n\t" //(src[xx+1] - src[xx])*2*xalpha
+		"shll $8, %%edi			\n\t"
+		"addl %%edi, %%esi		\n\t" //src[xx+1]*2*xalpha + src[xx]*(1-2*xalpha)
+		"shrl $1, %%esi			\n\t"
+		"movw %%si, (%1, %%eax, 2)	\n\t"
+		"addb %4, %%cl			\n\t" //2*xalpha += s_xinc&0xFF
+		"adcl %3, %%ebx			\n\t" //xx+= s_xinc>>8 + carry
+
+		"movzbl (%0, %%ebx), %%edi	\n\t" //src[xx]
+		"movzbl 1(%0, %%ebx), %%esi	\n\t" //src[xx+1]
+		"subl %%edi, %%esi		\n\t" //src[xx+1] - src[xx]
+		"imull %%ecx, %%esi		\n\t" //(src[xx+1] - src[xx])*2*xalpha
+		"shll $8, %%edi			\n\t"
+		"addl %%edi, %%esi		\n\t" //src[xx+1]*2*xalpha + src[xx]*(1-2*xalpha)
+		"shrl $1, %%esi			\n\t"
+		"movw %%si, 2(%1, %%eax, 2)	\n\t"
+		"addb %4, %%cl			\n\t" //2*xalpha += s_xinc&0xFF
+		"adcl %3, %%ebx			\n\t" //xx+= s_xinc>>8 + carry
+
+
+		"addl $2, %%eax			\n\t"
+		"cmpl %2, %%eax			\n\t"
+		" jb 1b				\n\t"
+
+
+		:: "r" (src), "r" (buf1), "m" (dstw), "m" (s_xinc>>8), "m" (s_xinc&0xFF)
+		: "%eax", "%ebx", "%ecx", "%edi", "%esi"
+		);
+#else
       for(i=0;i<dstw;i++){
 	register unsigned int xx=xpos>>8;
-        register unsigned int xalpha=xpos&0xFF;
-	buf1[i]=(src[xx]*(xalpha^255)+src[xx+1]*xalpha);
+        register unsigned int xalpha=(xpos&0xFF)>>1;
+	buf1[i]=(src[xx]*(xalpha^127)+src[xx+1]*xalpha);
 	xpos+=s_xinc;
       }
+#endif
       // *** horizontal scale U and V lines to temp buffer
       if(!(y0&1)){
         unsigned char *src1=srcptr[1]+(y1-y/2)*stride[1];
         unsigned char *src2=srcptr[2]+(y1-y/2)*stride[2];
         xpos=0;
         // this loop should be rewritten in MMX assembly!!!!
+#ifdef HAVE_MMX2
+	asm volatile(
+		"pxor %%mm7, %%mm7		\n\t"
+		"pxor %%mm2, %%mm2		\n\t" // 2*xalpha
+		"movd %5, %%mm6			\n\t" // s_xinc&0xFF
+		"punpcklwd %%mm6, %%mm6		\n\t"
+		"punpcklwd %%mm6, %%mm6		\n\t"
+		"movq %%mm6, %%mm2		\n\t"
+		"psllq $16, %%mm2		\n\t"
+		"paddb %%mm6, %%mm2		\n\t"
+		"psllq $16, %%mm2		\n\t"
+		"paddb %%mm6, %%mm2		\n\t"
+		"psllq $16, %%mm2		\n\t" //0,t,2t,3t		t=s_xinc&0xFF
+		"movq %%mm2, temp0		\n\t"
+		"movd %4, %%mm6			\n\t" //(s_xinc*4)&0xFF
+		"punpcklwd %%mm6, %%mm6		\n\t"
+		"punpcklwd %%mm6, %%mm6		\n\t"
+		"xorl %%eax, %%eax		\n\t" // i
+		"xorl %%ebx, %%ebx		\n\t" // xx
+		"movl %0, %%esi			\n\t" // src
+		"movl %1, %%edi			\n\t" // buf1
+		"movl %3, %%edx			\n\t" // (s_xinc*4)>>8
+		"xorl %%ecx, %%ecx		\n\t"
+		"movb %4, %%ch			\n\t" // (s_xinc*4)&0xFF
+//	"int $3\n\t"
+		"call funnyUVCode			\n\t"
+		"movq temp0, %%mm2		\n\t"
+		"xorb %%cl, %%cl		\n\t"
+		"call funnyUVCode			\n\t"
+		"movq temp0, %%mm2		\n\t"
+		"xorb %%cl, %%cl		\n\t"
+		"call funnyUVCode			\n\t"
+		"movq temp0, %%mm2		\n\t"
+		"xorb %%cl, %%cl		\n\t"
+		"call funnyUVCode			\n\t"
+		"movq temp0, %%mm2		\n\t"
+		"xorb %%cl, %%cl		\n\t"
+		"call funnyUVCode			\n\t"
+		"movq temp0, %%mm2		\n\t"
+		"xorb %%cl, %%cl		\n\t"
+		"call funnyUVCode			\n\t"
+		"movq temp0, %%mm2		\n\t"
+		"xorb %%cl, %%cl		\n\t"
+		"call funnyUVCode			\n\t"
+		"movq temp0, %%mm2		\n\t"
+		"xorb %%cl, %%cl		\n\t"
+		"call funnyUVCode			\n\t"
+
+		"xorl %%eax, %%eax		\n\t" // i
+		"xorl %%ebx, %%ebx		\n\t" /