added idct mmx code

Originally committed as revision 41 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/i386/idct_mmx.c

+/*
+ * Note: For libavcodec, this code can also be used under the LGPL license
+ */
+/*
+ * idct_mmx.c
+ * Copyright (C) 1999-2001 Aaron Holtzman <aholtzma@ess.engr.uvic.ca>
+ *
+ * This file is part of mpeg2dec, a free MPEG-2 video stream decoder.
+ *
+ * mpeg2dec is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * mpeg2dec 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include <inttypes.h>
+
+#include "mmx.h"
+
+#define ATTR_ALIGN(align) __attribute__ ((__aligned__ (align)))
+
+#define ROW_SHIFT 11
+#define COL_SHIFT 6
+
+#define round(bias) ((int)(((bias)+0.5) * (1<<ROW_SHIFT)))
+#define rounder(bias) {round (bias), round (bias)}
+
+#if 0
+/* C row IDCT - its just here to document the MMXEXT and MMX versions */
+static inline void idct_row (int16_t * row, int offset,
+			     int16_t * table, int32_t * rounder)
+{
+    int C1, C2, C3, C4, C5, C6, C7;
+    int a0, a1, a2, a3, b0, b1, b2, b3;
+
+    row += offset;
+
+    C1 = table[1];
+    C2 = table[2];
+    C3 = table[3];
+    C4 = table[4];
+    C5 = table[5];
+    C6 = table[6];
+    C7 = table[7];
+
+    a0 = C4*row[0] + C2*row[2] + C4*row[4] + C6*row[6] + *rounder;
+    a1 = C4*row[0] + C6*row[2] - C4*row[4] - C2*row[6] + *rounder;
+    a2 = C4*row[0] - C6*row[2] - C4*row[4] + C2*row[6] + *rounder;
+    a3 = C4*row[0] - C2*row[2] + C4*row[4] - C6*row[6] + *rounder;
+
+    b0 = C1*row[1] + C3*row[3] + C5*row[5] + C7*row[7];
+    b1 = C3*row[1] - C7*row[3] - C1*row[5] - C5*row[7];
+    b2 = C5*row[1] - C1*row[3] + C7*row[5] + C3*row[7];
+    b3 = C7*row[1] - C5*row[3] + C3*row[5] - C1*row[7];
+
+    row[0] = (a0 + b0) >> ROW_SHIFT;
+    row[1] = (a1 + b1) >> ROW_SHIFT;
+    row[2] = (a2 + b2) >> ROW_SHIFT;
+    row[3] = (a3 + b3) >> ROW_SHIFT;
+    row[4] = (a3 - b3) >> ROW_SHIFT;
+    row[5] = (a2 - b2) >> ROW_SHIFT;
+    row[6] = (a1 - b1) >> ROW_SHIFT;
+    row[7] = (a0 - b0) >> ROW_SHIFT;
+}
+#endif
+
+
+/* MMXEXT row IDCT */
+
+#define mmxext_table(c1,c2,c3,c4,c5,c6,c7)	{  c4,  c2, -c4, -c2,	\
+						   c4,  c6,  c4,  c6,	\
+						   c1,  c3, -c1, -c5,	\
+						   c5,  c7,  c3, -c7,	\
+						   c4, -c6,  c4, -c6,	\
+						  -c4,  c2,  c4, -c2,	\
+						   c5, -c1,  c3, -c1,	\
+						   c7,  c3,  c7, -c5 }
+
+static inline void mmxext_row_head (int16_t * row, int offset, int16_t * table)
+{
+    movq_m2r (*(row+offset), mm2);	// mm2 = x6 x4 x2 x0
+
+    movq_m2r (*(row+offset+4), mm5);	// mm5 = x7 x5 x3 x1
+    movq_r2r (mm2, mm0);		// mm0 = x6 x4 x2 x0
+
+    movq_m2r (*table, mm3);		// mm3 = -C2 -C4 C2 C4
+    movq_r2r (mm5, mm6);		// mm6 = x7 x5 x3 x1
+
+    movq_m2r (*(table+4), mm4);		// mm4 = C6 C4 C6 C4
+    pmaddwd_r2r (mm0, mm3);		// mm3 = -C4*x4-C2*x6 C4*x0+C2*x2
+
+    pshufw_r2r (mm2, mm2, 0x4e);	// mm2 = x2 x0 x6 x4
+}
+
+static inline void mmxext_row (int16_t * table, int32_t * rounder)
+{
+    movq_m2r (*(table+8), mm1);		// mm1 = -C5 -C1 C3 C1
+    pmaddwd_r2r (mm2, mm4);		// mm4 = C4*x0+C6*x2 C4*x4+C6*x6
+
+    pmaddwd_m2r (*(table+16), mm0);	// mm0 = C4*x4-C6*x6 C4*x0-C6*x2
+    pshufw_r2r (mm6, mm6, 0x4e);	// mm6 = x3 x1 x7 x5
+
+    movq_m2r (*(table+12), mm7);	// mm7 = -C7 C3 C7 C5
+    pmaddwd_r2r (mm5, mm1);		// mm1 = -C1*x5-C5*x7 C1*x1+C3*x3
+
+    paddd_m2r (*rounder, mm3);		// mm3 += rounder
+    pmaddwd_r2r (mm6, mm7);		// mm7 = C3*x1-C7*x3 C5*x5+C7*x7
+
+    pmaddwd_m2r (*(table+20), mm2);	// mm2 = C4*x0-C2*x2 -C4*x4+C2*x6
+    paddd_r2r (mm4, mm3);		// mm3 = a1 a0 + rounder
+
+    pmaddwd_m2r (*(table+24), mm5);	// mm5 = C3*x5-C1*x7 C5*x1-C1*x3
+    movq_r2r (mm3, mm4);		// mm4 = a1 a0 + rounder
+
+    pmaddwd_m2r (*(table+28), mm6);	// mm6 = C7*x1-C5*x3 C7*x5+C3*x7
+    paddd_r2r (mm7, mm1);		// mm1 = b1 b0
+
+    paddd_m2r (*rounder, mm0);		// mm0 += rounder
+    psubd_r2r (mm1, mm3);		// mm3 = a1-b1 a0-b0 + rounder
+
+    psrad_i2r (ROW_SHIFT, mm3);		// mm3 = y6 y7
+    paddd_r2r (mm4, mm1);		// mm1 = a1+b1 a0+b0 + rounder
+
+    paddd_r2r (mm2, mm0);		// mm0 = a3 a2 + rounder
+    psrad_i2r (ROW_SHIFT, mm1);		// mm1 = y1 y0
+
+    paddd_r2r (mm6, mm5);		// mm5 = b3 b2
+    movq_r2r (mm0, mm4);		// mm4 = a3 a2 + rounder
+
+    paddd_r2r (mm5, mm0);		// mm0 = a3+b3 a2+b2 + rounder
+    psubd_r2r (mm5, mm4);		// mm4 = a3-b3 a2-b2 + rounder
+}
+
+static inline void mmxext_row_tail (int16_t * row, int store)
+{
+    psrad_i2r (ROW_SHIFT, mm0);		// mm0 = y3 y2
+
+    psrad_i2r (ROW_SHIFT, mm4);		// mm4 = y4 y5
+
+    packssdw_r2r (mm0, mm1);		// mm1 = y3 y2 y1 y0
+
+    packssdw_r2r (mm3, mm4);		// mm4 = y6 y7 y4 y5
+
+    movq_r2m (mm1, *(row+store));	// save y3 y2 y1 y0
+    pshufw_r2r (mm4, mm4, 0xb1);	// mm4 = y7 y6 y5 y4
+
+    /* slot */
+
+    movq_r2m (mm4, *(row+store+4));	// save y7 y6 y5 y4
+}
+
+static inline void mmxext_row_mid (int16_t * row, int store,
+				   int offset, int16_t * table)
+{
+    movq_m2r (*(row+offset), mm2);	// mm2 = x6 x4 x2 x0
+    psrad_i2r (ROW_SHIFT, mm0);		// mm0 = y3 y2
+
+    movq_m2r (*(row+offset+4), mm5);	// mm5 = x7 x5 x3 x1
+    psrad_i2r (ROW_SHIFT, mm4);		// mm4 = y4 y5
+
+    packssdw_r2r (mm0, mm1);		// mm1 = y3 y2 y1 y0
+    movq_r2r (mm5, mm6);		// mm6 = x7 x5 x3 x1
+
+    packssdw_r2r (mm3, mm4);		// mm4 = y6 y7 y4 y5
+    movq_r2r (mm2, mm0);		// mm0 = x6 x4 x2 x0
+
+    movq_r2m (mm1, *(row+store));	// save y3 y2 y1 y0
+    pshufw_r2r (mm4, mm4, 0xb1);	// mm4 = y7 y6 y5 y4
+
+    movq_m2r (*table, mm3);		// mm3 = -C2 -C4 C2 C4
+    movq_r2m (mm4, *(row+store+4));	// save y7 y6 y5 y4
+
+    pmaddwd_r2r (mm0, mm3);		// mm3 = -C4*x4-C2*x6 C4*x0+C2*x2
+
+    movq_m2r (*(table+4), mm4);		// mm4 = C6 C4 C6 C4
+    pshufw_r2r (mm2, mm2, 0x4e);	// mm2 = x2 x0 x6 x4
+}
+
+
+/* MMX row IDCT */
+
+#define mmx_table(c1,c2,c3,c4,c5,c6,c7)	{  c4,  c2,  c4,  c6,	\
+					   c4,  c6, -c4, -c2,	\
+					   c1,  c3,  c3, -c7,	\
+					   c5,  c7, -c1, -c5,	\
+					   c4, -c6,  c4, -c2,	\
+					  -c4,  c2,  c4, -c6,	\
+					   c5, -c1,  c7, -c5,	\
+					   c7,  c3,  c3, -c1 }
+
+static inline void mmx_row_head (int16_t * row, int offset, int16_t * table)
+{
+    movq_m2r (*(row+offset), mm2);	// mm2 = x6 x4 x2 x0
+
+    movq_m2r (*(row+offset+4), mm5);	// mm5 = x7 x5 x3 x1
+    movq_r2r (mm2, mm0);		// mm0 = x6 x4 x2 x0
+
+    movq_m2r (*table, mm3);		// mm3 = C6 C4 C2 C4
+    movq_r2r (mm5, mm6);		// mm6 = x7 x5 x3 x1
+
+    punpckldq_r2r (mm0, mm0);		// mm0 = x2 x0 x2 x0
+
+    movq_m2r (*(table+4), mm4);		// mm4 = -C2 -C4 C6 C4
+    pmaddwd_r2r (mm0, mm3);		// mm3 = C4*x0+C6*x2 C4*x0+C2*x2
+
+    movq_m2r (*(table+8), mm1);		// mm1 = -C7 C3 C3 C1
+    punpckhdq_r2r (mm2, mm2);		// mm2 = x6 x4 x6 x4
+}
+
+static inline void mmx_row (int16_t * table, int32_t * rounder)
+{
+    pmaddwd_r2r (mm2, mm4);		// mm4 = -C4*x4-C2*x6 C4*x4+C6*x6
+    punpckldq_r2r (mm5, mm5);		// mm5 = x3 x1 x3 x1
+
+    pmaddwd_m2r (*(table+16), mm0);	// mm0 = C4*x0-C2*x2 C4*x0-C6*x2
+    punpckhdq_r2r (mm6, mm6);		// mm6 = x7 x5 x7 x5
+
+    movq_m2r (*(table+12), mm7);	// mm7 = -C5 -C1 C7 C5
+    pmaddwd_r2r (mm5, mm1);		// mm1 = C3*x1-C7*x3 C1*x1+C3*x3
+
+    paddd_m2r (*rounder, mm3);		// mm3 += rounder
+    pmaddwd_r2r (mm6, mm7);		// mm7 = -C1*x5-C5*x7 C5*x5+C7*x7
+
+    pmaddwd_m2r (*(table+20), mm2);	// mm2 = C4*x4-C6*x6 -C4*x4+C2*x6
+    paddd_r2r (mm4, mm3);		// mm3 = a1 a0 + rounder
+
+    pmaddwd_m2r (*(table+24), mm5);	// mm5 = C7*x1-C5*x3 C5*x1-C1*x3
+    movq_r2r (mm3, mm4);		// mm4 = a1 a0 + rounder
+
+    pmaddwd_m2r (*(table+28), mm6);	// mm6 = C3*x5-C1*x7 C7*x5+C3*x7
+    paddd_r2r (mm7, mm1);		// mm1 = b1 b0
+
+    paddd_m2r (*rounder, mm0);		// mm0 += rounder
+    psubd_r2r (mm1, mm3);		// mm3 = a1-b1 a0-b0 + rounder
+
+    psrad_i2r (ROW_SHIFT, mm3);		// mm3 = y6 y7
+    paddd_r2r (mm4, mm1);		// mm1 = a1+b1 a0+b0 + rounder
+
+    paddd_r2r (mm2, mm0);		// mm0 = a3 a2 + rounder
+    psrad_i2r (ROW_SHIFT, mm1);		// mm1 = y1 y0
+
+    paddd_r2r (mm6, mm5);		// mm5 = b3 b2
+    movq_r2r (mm0, mm7);		// mm7 = a3 a2 + rounder
+
+    paddd_r2r (mm5, mm0);		// mm0 = a3+b3 a2+b2 + rounder
+    psubd_r2r (mm5, mm7);		// mm7 = a3-b3 a2-b2 + rounder
+}
+
+static inline void mmx_row_tail (int16_t * row, int store)
+{
+    psrad_i2r (ROW_SHIFT, mm0);		// mm0 = y3 y2
+
+    psrad_i2r (ROW_SHIFT, mm7);		// mm7 = y4 y5
+
+    packssdw_r2r (mm0, mm1);		// mm1 = y3 y2 y1 y0
+
+    packssdw_r2r (mm3, mm7);		// mm7 = y6 y7 y4 y5
+
+    movq_r2m (mm1, *(row+store));	// save y3 y2 y1 y0
+    movq_r2r (mm7, mm4);		// mm4 = y6 y7 y4 y5
+
+    pslld_i2r (16, mm7);		// mm7 = y7 0 y5 0
+
+    psrld_i2r (16, mm4);		// mm4 = 0 y6 0 y4
+
+    por_r2r (mm4, mm7);			// mm7 = y7 y6 y5 y4
+
+    /* slot */
+
+    movq_r2m (mm7, *(row+store+4));	// save y7 y6 y5 y4
+}
+
+static inline void mmx_row_mid (int16_t * row, int store,
+				int offset, int16_t * table)
+{
+    movq_m2r (*(row+offset), mm2);	// mm2 = x6 x4 x2 x0
+    psrad_i2r (ROW_SHIFT, mm0);		// mm0 = y3 y2
+
+    movq_m2r (*(row+offset+4), mm5);	// mm5 = x7 x5 x3 x1
+    psrad_i2r (ROW_SHIFT, mm7);		// mm7 = y4 y5
+
+    packssdw_r2r (mm0, mm1);		// mm1 = y3 y2 y1 y0
+    movq_r2r (mm5, mm6);		// mm6 = x7 x5 x3 x1
+
+    packssdw_r2r (mm3, mm7);		// mm7 = y6 y7 y4 y5
+    movq_r2r (mm2, mm0);		// mm0 = x6 x4 x2 x0
+
+    movq_r2m (mm1, *(row+store));	// save y3 y2 y1 y0
+    movq_r2r (mm7, mm1);		// mm1 = y6 y7 y4 y5
+
+    punpckldq_r2r (mm0, mm0);		// mm0 = x2 x0 x2 x0
+    psrld_i2r (16, mm7);		// mm7 = 0 y6 0 y4
+
+    movq_m2r (*table, mm3);		// mm3 = C6 C4 C2 C4
+    pslld_i2r (16, mm1);		// mm1 = y7 0 y5 0
+
+    movq_m2r (*(table+4), mm4);		// mm4 = -C2 -C4 C6 C4
+    por_r2r (mm1, mm7);			// mm7 = y7 y6 y5 y4
+
+    movq_m2r (*(table+8), mm1);		// mm1 = -C7 C3 C3 C1
+    punpckhdq_r2r (mm2, mm2);		// mm2 = x6 x4 x6 x4
+
+    movq_r2m (mm7, *(row+store+4));	// save y7 y6 y5 y4
+    pmaddwd_r2r (mm0, mm3);		// mm3 = C4*x0+C6*x2 C4*x0+C2*x2
+}
+
+
+#if 0
+// C column IDCT - its just here to document the MMXEXT and MMX versions
+static inline void idct_col (int16_t * col, int offset)
+{
+/* multiplication - as implemented on mmx */
+#define F(c,x) (((c) * (x)) >> 16)
+
+/* saturation - it helps us handle torture test cases */
+#define S(x) (((x)>32767) ? 32767 : ((x)<-32768) ? -32768 : (x))
+
+    int16_t x0, x1, x2, x3, x4, x5, x6, x7;
+    int16_t y0, y1, y2, y3, y4, y5, y6, y7;
+    int16_t a0, a1, a2, a3, b0, b1, b2, b3;
+    int16_t u04, v04, u26, v26, u17, v17, u35, v35, u12, v12;
+
+    col += offset;
+
+    x0 = col[0*8];
+    x1 = col[1*8];
+    x2 = col[2*8];
+    x3 = col[3*8];
+    x4 = col[4*8];
+    x5 = col[5*8];
+    x6 = col[6*8];
+    x7 = col[7*8];
+
+    u04 = S (x0 + x4);
+    v04 = S (x0 - x4);
+    u26 = S (F (T2, x6) + x2);
+    v26 = S (F (T2, x2) - x6);
+
+    a0 = S (u04 + u26);
+    a1 = S (v04 + v26);
+    a2 = S (v04 - v26);
+    a3 = S (u04 - u26);
+
+    u17 = S (F (T1, x7) + x1);
+    v17 = S (F (T1, x1) - x7);
+    u35 = S (F (T3, x5) + x3);
+    v35 = S (F (T3, x3) - x5);
+
+    b0 = S (u17 + u35);
+    b3 = S (v17 - v35);
+    u12 = S (u17 - u35);
+    v12 = S (v17 + v35);
+    u12 = S (2 * F (C4, u12));
+    v12 = S (2 * F (C4, v12));
+    b1 = S (u12 + v12);
+    b2 = S (u12 - v12);
+
+    y0 = S (a0 + b0) >> COL_SHIFT;
+    y1 = S (a1 + b1) >> COL_SHIFT;
+    y2 = S (a2 + b2) >> COL_SHIFT;
+    y3 = S (a3 + b3) >> COL_SHIFT;
+
+    y4 = S (a3 - b3) >> COL_SHIFT;
+    y5 = S (a2 - b2) >> COL_SHIFT;
+    y6 = S (a1 - b1) >> COL_SHIFT;
+    y7 = S (a0 - b0) >> COL_SHIFT;
+
+    col[0*8] = y0;
+    col[1*8] = y1;
+    col[2*8] = y2;
+    col[3*8] = y3;
+    col[4*8] = y4;
+    col[5*8] = y5;
+    col[6*8] = y6;
+    col[7*8] = y7;
+}
+#endif
+
+
+// MMX column IDCT
+static inline void idct_col (int16_t * col, int offset)
+{
+#define T1 13036
+#define T2 27146
+#define T3 43790
+#define C4 23170
+
+    static short _T1[] ATTR_ALIGN(8) = {T1,T1,T1,T1};
+    static short _T2[] ATTR_ALIGN(8) = {T2,T2,T2,T2};
+    static short _T3[] ATTR_ALIGN(8) = {T3,T3,T3,T3};
+    static short _C4[] ATTR_ALIGN(8) = {C4,C4,C4,C4};
+
+    /* column code adapted from peter gubanov */
+    /* http://www.elecard.com/peter/idct.shtml */
+
+    movq_m2r (*_T1, mm0);		// mm0 = T1
+
+    movq_m2r (*(col+offset+1*8), mm1);	// mm1 = x1
+    movq_r2r (mm0, mm2);		// mm2 = T1
+
+    movq_m2r (*(col+offset+7*8), mm4);	// mm4 = x7
+    pmulhw_r2r (mm1, mm0);		// mm0 = T1*x1
+
+    movq_m2r (*_T3, mm5);		// mm5 = T3
+    pmulhw_r2r (mm4, mm2);		// mm2 = T1*x7
+
+    movq_m2r (*(col+offset+5*8), mm6);	// mm6 = x5
+    movq_r2r (mm5, mm7);		// mm7 = T3-1
+
+    movq_m2r (*(col+offset+3*8), mm3);	// mm3 = x3
+    psubsw_r2r (mm4, mm0);		// mm0 = v17
+
+    movq_m2r (*_T2, mm4);		// mm4 = T2
+    pmulhw_r2r (mm3, mm5);		// mm5 = (T3-1)*x3
+
+    paddsw_r2r (mm2, mm1);		// mm1 = u17
+    pmulhw_r2r (mm6, mm7);		// mm7 = (T3-1)*x5
+
+    /* slot */
+
+    movq_r2r (mm4, mm2);		// mm2 = T2
+    paddsw_r2r (mm3, mm5);		// mm5 = T3*x3
+
+    pmulhw_m2r (*(col+offset+2*8), mm4);// mm4 = T2*x2
+    paddsw_r2r (mm6, mm7);		// mm7 = T3*x5
+
+    psubsw_r2r (mm6, mm5);		// mm5 = v35
+    paddsw_r2r (mm3, mm7);		// mm7 = u35
+
+    movq_m2r (*(col+offset+6*8), mm3);	// mm3 = x6
+    movq_r2r (mm0, mm6);		// mm6 = v17
+
+    pmulhw_r2r (mm3, mm2);		// mm2 = T2*x6
+    psubsw_r2r (mm5, mm0);		// mm0 = b3
+
+    psubsw_r2r (mm3, mm4);		// mm4 = v26
+    paddsw_r2r (mm6, mm5);		// mm5 = v12
+
+    movq_r2m (mm0, *(col+offset+3*8));	// save b3 in scratch0
+    movq_r2r (mm1, mm6);		// mm6 = u17
+
+    paddsw_m2r (*(col+offset+2*8), mm2);// mm2 = u26
+    paddsw_r2r (mm7, mm6);		// mm6 = b0
+
+    psubsw_r2r (mm7, mm1);		// mm1 = u12
+    movq_r2r (mm1, mm7);		// mm7 = u12
+
+    movq_m2r (*(col+offset+0*8), mm3);	// mm3 = x0
+    paddsw_r2r (mm5, mm1);		// mm1 = u12+v12
+
+    movq_m2r (*_C4, mm0);		// mm0 = C4/2
+    psubsw_r2r (mm5, mm7);		// mm7 = u12-v12
+
+    movq_r2m (mm6, *(col+offset+5*8));	// save b0 in scratch1
+    pmulhw_r2r (mm0, mm1);		// mm1 = b1/2
+
+    movq_r2r (mm4, mm6);		// mm6 = v26
+    pmulhw_r2r (mm0, mm7);		// mm7 = b2/2
+
+    movq_m2r (*(col+offset+4*8), mm5);	// mm5 = x4
+    movq_r2r (mm3, mm0);		// mm0 = x0
+
+    psubsw_r2r (mm5, mm3);		// mm3 = v04
+    paddsw_r2r (mm5, mm0);		// mm0 = u04
+
+    paddsw_r2r (mm3, mm4);		// mm4 = a1
+    movq_r2r (mm0, mm5);		// mm5 = u04
+
+    psubsw_r2r (mm6, mm3);		// mm3 = a2
+    paddsw_r2r (mm2, mm5);		// mm5 = a0
+
+    paddsw_r2r (mm1, mm1);		// mm1 = b1
+    psubsw_r2r (mm2, mm0);		// mm0 = a3
+
+    paddsw_r2r (mm7, mm7);		// mm7 = b2
+    movq_r2r (mm3, mm2);		// mm2 = a2
+
+    movq_r2r (mm4, mm6);		// mm6 = a1
+    paddsw_r2r (mm7, mm3);		// mm3 = a2+b2
+
+    psraw_i2r (COL_SHIFT, mm3);		// mm3 = y2
+    paddsw_r2r (mm1, mm4);		// mm4 = a1+b1
+
+    psraw_i2r (COL_SHIFT, mm4);		// mm4 = y1
+    psubsw_r2r (mm1, mm6);		// mm6 = a1-b1
+
+    movq_m2r (*(col+offset+5*8), mm1);	// mm1 = b0
+    psubsw_r2r (mm7, mm2);		// mm2 = a2-b2
+
+    psraw_i2r (COL_SHIFT, mm6);		// mm6 = y6
+    movq_r2r (mm5, mm7);		// mm7 = a0
+
+    movq_r2m (mm4, *(col+offset+1*8));	// save y1
+    psraw_i2r (COL_SHIFT, mm2);		// mm2 = y5
+
+    movq_r2m (mm3, *(col+offset+2*8));	// save y2
+    paddsw_r2r (mm1, mm5);		// mm5 = a0+b0
+
+    movq_m2r (*(col+offset+3*8), mm4);	// mm4 = b3
+    psubsw_r2r (mm1, mm7);		// mm7 = a0-b0
+
+    psraw_i2r (COL_SHIFT, mm5);		// mm5 = y0
+    movq_r2r (mm0, mm3);		// mm3 = a3
+
+    movq_r2m (mm2, *(col+offset+5*8));	// save y5
+    psubsw_r2r (mm4, mm3);		// mm3 = a3-b3
+
+    psraw_i2r (COL_SHIFT, mm7);		// mm7 = y7
+    paddsw_r2r (mm0, mm4);		// mm4 = a3+b3
+
+    movq_r2m (mm5, *(col+offset+0*8));	// save y0
+    psraw_i2r (COL_SHIFT, mm3);		// mm3 = y4
+
+    movq_r2m (mm6, *(col+offset+6*8));	// save y6
+    psraw_i2r (COL_SHIFT, mm4);		// mm4 = y3
+
+    movq_r2m (mm7, *(col+offset+7*8));	// save y7
+
+    movq_r2m (mm3, *(col+offset+4*8));	// save y4
+
+    movq_r2m (mm4, *(col+offset+3*8));	// save y3
+}
+
+
+static int32_t rounder0[] ATTR_ALIGN(8) =
+    rounder ((1 << (COL_SHIFT - 1)) - 0.5);
+static int32_t rounder4[] ATTR_ALIGN(8) = rounder (0);
+static int32_t rounder1[] ATTR_ALIGN(8) =
+    rounder (1.25683487303);	/* C1*(C1/C4+C1+C7)/2 */
+static int32_t rounder7[] ATTR_ALIGN(8) =
+    rounder (-0.25);		/* C1*(C7/C4+C7-C1)/2 */
+static int32_t rounder2[] ATTR_ALIGN(8) =
+    rounder (0.60355339059);	/* C2 * (C6+C2)/2 */
+static int32_t rounder6[] ATTR_ALIGN(8) =
+    rounder (-0.25);		/* C2 * (C6-C2)/2 */
+static int32_t rounder3[] ATTR_ALIGN(8) =
+    rounder (0.087788325588);	/* C3*(-C3/C4+C3+C5)/2 */
+static int32_t rounder5[] ATTR_ALIGN(8) =
+    rounder (-0.441341716183);	/* C3*(-C5/C4+C5-C3)/2 */
+
+
+#define declare_idct(idct,table,idct_row_head,idct_row,idct_row_tail,idct_row_mid)	\
+void idct (int16_t * block)					\
+{									\
+    static int16_t table04[] ATTR_ALIGN(16) =				\
+	table (22725, 21407, 19266, 16384, 12873,  8867, 4520);		\
+    static int16_t table17[] ATTR_ALIGN(16) =				\
+	table (31521, 29692, 26722, 22725, 17855, 12299, 6270);		\
+    static int16_t table26[] ATTR_ALIGN(16) =				\
+	table (29692, 27969, 25172, 21407, 16819, 11585, 5906);		\
+    static int16_t table35[] ATTR_ALIGN(16) =				\
+	table (26722, 25172, 22654, 19266, 15137, 10426, 5315);		\
+									\
+    idct_row_head (block, 0*8, table04);				\
+    idct_row (table04, rounder0);					\
+    idct_row_mid (block, 0*8, 4*8, table04);				\
+    idct_row (table04, rounder4);					\
+    idct_row_mid (block, 4*8, 1*8, table17);				\
+    idct_row (table17, rounder1);					\
+    idct_row_mid (block, 1*8, 7*8, table17);				\
+    idct_row (table17, rounder7);					\
+    idct_row_mid (block, 7*8, 2*8, table26);				\
+    idct_row (table26, rounder2);					\
+    idct_row_mid (block, 2*8, 6*8, table26);				\
+    idct_row (table26, rounder6);					\
+    idct_row_mid (block, 6*8, 3*8, table35);				\
+    idct_row (table35, rounder3);					\
+    idct_row_mid (block, 3*8, 5*8, table35);				\
+    idct_row (table35, rounder5);					\
+    idct_row_tail (block, 5*8);						\
+									\
+    idct_col (block, 0);						\
+    idct_col (block, 4);						\
+}
+
+
+declare_idct (ff_mmxext_idct, mmxext_table,
+	      mmxext_row_head, mmxext_row, mmxext_row_tail, mmxext_row_mid)
+
+declare_idct (ff_mmx_idct, mmx_table,
+	      mmx_row_head, mmx_row, mmx_row_tail, mmx_row_mid)