text: /***************************************************************************
  *
  *                INTEL Corporation Proprietary Information  
  *
  *      
  *                  Copyright (c) 1996 Intel Corporation.
  *                         All rights reserved.
  *
  ***************************************************************************
  */
  /*
   * jfdctint.c
   *
   * Copyright (C) 1991-1996, Thomas G. Lane.
   * This file is part of the Independent JPEG Group's software.
   * For conditions of distribution and use, see the accompanying README file.
   *
   * This file contains a slow-but-accurate integer implementation of the
   * forward DCT (Discrete Cosine Transform).
   *
   * A 2-D DCT can be done by 1-D DCT on each row followed by 1-D DCT
   * on each column.  Direct algorithms are also available, but they are
   * much more complex and seem not to be any faster when reduced to code.
   *
   * This implementation is based on an algorithm described in
   *   C. Loeffler, A. Ligtenberg and G. Moschytz, "Practical Fast 1-D DCT
   *   Algorithms with 11 Multiplications", Proc. Int'l. Conf. on Acoustics,
   *   Speech, and Signal Processing 1989 (ICASSP '89), pp. 988-991.
   * The primary algorithm described there uses 11 multiplies and 29 adds.
   * We use their alternate method with 12 multiplies and 32 adds.
   * The advantage of this method is that no data path contains more than one
   * multiplication; this allows a very simple and accurate implementation in
   * scaled fixed-point arithmetic, with a minimal number of shifts.
   */
  
  #define JPEG_INTERNALS
  #include "jinclude.h"
  #include "jpeglib.h"
  #include "jdct.h"		/* Private declarations for DCT subsystem */
  
  #ifdef DCT_ISLOW_SUPPORTED
  
  #ifndef _X86_
  
  GLOBAL(void)
  pfdct8x8llm (DCTELEM * data)
  {
  }
  
  #else
  
  
  /*
   * This module is specialized to the case DCTSIZE = 8.
   */
  
  #if DCTSIZE != 8
    Sorry, this code only copes with 8x8 DCTs. /* deliberate syntax err */
  #endif
  
  
  /*
   * The poop on this scaling stuff is as follows:
   *
   * Each 1-D DCT step produces outputs which are a factor of sqrt(N)
   * larger than the true DCT outputs.  The final outputs are therefore
   * a factor of N larger than desired; since N=8 this can be cured by
   * a simple right shift at the end of the algorithm.  The advantage of
   * this arrangement is that we save two multiplications per 1-D DCT,
   * because the y0 and y4 outputs need not be divided by sqrt(N).
   * In the IJG code, this factor of 8 is removed by the quantization step
   * (in jcdctmgr.c), NOT in this module.
   *
   * We have to do addition and subtraction of the integer inputs, which
   * is no problem, and multiplication by fractional constants, which is
   * a problem to do in integer arithmetic.  We multiply all the constants
   * by CONST_SCALE and convert them to integer constants (thus retaining
   * CONST_BITS bits of precision in the constants).  After doing a
   * multiplication we have to divide the product by CONST_SCALE, with proper
   * rounding, to produce the correct output.  This division can be done
   * cheaply as a right shift of CONST_BITS bits.  We postpone shifting
   * as long as possible so that partial sums can be added together with
   * full fractional precision.
   *
   * The outputs of the first pass are scaled up by PASS1_BITS bits so that
   * they are represented to better-than-integral precision.  These outputs
   * require BITS_IN_JSAMPLE + PASS1_BITS + 3 bits; this fits in a 16-bit word
   * with the recommended scaling.  (For 12-bit sample data, the intermediate
   * array is INT32 anyway.)
   *
   * To avoid overflow of the 32-bit intermediate results in pass 2, we must
   * have BITS_IN_JSAMPLE + CONST_BITS + PASS1_BITS <= 26.  Error analysis
   * shows that the values given below are the most effective.
   */
  
  #if BITS_IN_JSAMPLE == 8
  #define CONST_BITS  13
  #define PASS1_BITS  2
  #else
  #define CONST_BITS  13
  #define PASS1_BITS  1		/* lose a little precision to avoid overflow */
  #endif
  
  /* Some C compilers fail to reduce "FIX(constant)" at compile time, thus
   * causing a lot of useless floating-point operations at run time.
   * To get around this we use the following pre-calculated constants.
   * If you change CONST_BITS you may want to add appropriate values.
   * (With a reasonable C compiler, you can just rely on the FIX() macro...)
   */
  
  #if CONST_BITS == 13
  #define FIX_0_298631336				2446		/* FIX(0.298631336) */
  #define FIX_0_390180644				3196		/* FIX(0.390180644) */
  #define FIX_0_541196100				4433		/* FIX(0.541196100) */
  #define FIX_0_765366865				6270		/* FIX(0.765366865) */
  #define FIX_0_899976223				7373		/* FIX(0.899976223) */
  #define FIX_1_175875602				9633		/* FIX(1.175875602) */
  #define FIX_1_501321110				12299		/* FIX(1.501321110) */
  #define FIX_1_847759065				15137		/* FIX(1.847759065) */
  #define FIX_1_961570560				16069		/* FIX(1.961570560) */
  #define FIX_2_053119869				16819		/* FIX(2.053119869) */
  #define FIX_2_562915447				20995		/* FIX(2.562915447) */
  #define FIX_3_072711026				25172		/* FIX(3.072711026) */
  #else
  #define FIX_0_298631336  FIX(0.298631336)
  #define FIX_0_390180644  FIX(0.390180644)
  #define FIX_0_541196100  FIX(0.541196100)
  #define FIX_0_765366865  FIX(0.765366865)
  #define FIX_0_899976223  FIX(0.899976223)
  #define FIX_1_175875602  FIX(1.175875602)
  #define FIX_1_501321110  FIX(1.501321110)
  #define FIX_1_847759065  FIX(1.847759065)
  #define FIX_1_961570560  FIX(1.961570560)
  #define FIX_2_053119869  FIX(2.053119869)
  #define FIX_2_562915447  FIX(2.562915447)
  #define FIX_3_072711026  FIX(3.072711026)
  #endif
  
  
  /* Multiply an INT32 variable by an INT32 constant to yield an INT32 result.
   * For 8-bit samples with the recommended scaling, all the variable
   * and constant values involved are no more than 16 bits wide, so a
   * 16x16->32 bit multiply can be used instead of a full 32x32 multiply.
   * For 12-bit samples, a full 32-bit multiplication will be needed.
   */
  
  #if BITS_IN_JSAMPLE == 8
  #define MULTIPLY(var,const)  MULTIPLY16C16(var,const)
  #else
  #define MULTIPLY(var,const)  ((var) * (const))
  #endif
  
  #define	DATASIZE	4
  #define	DCTWIDTH	32
  
  /*
   * Perform the forward DCT on one block of samples.
   */
  
  GLOBAL(void)
  pfdct8x8llm (DCTELEM * data)
  {
    INT32 tmp4, tmp5, tmp6, tmp7;
    int counter;
  
    __asm{
   
    /* Pass 1: process rows. */
    /* Note results are scaled up by sqrt(8) compared to a true DCT; */
    /* furthermore, we scale the results by 2**PASS1_BITS. */
  
  //  dataptr = data;
  		mov 	esi, [data]
  		mov		counter, 8
  		
  //  for (ctr = DCTSIZE-1; ctr >= 0; ctr--) {
  //   tmp0 = dataptr[0] + dataptr[7];
  //   tmp7 = dataptr[0] - dataptr[7];
  //    tmp1 = dataptr[1] + dataptr[6];
  //    tmp6 = dataptr[1] - dataptr[6];
  //    tmp2 = dataptr[2] + dataptr[5];
  //    tmp5 = dataptr[2] - dataptr[5];
  //    tmp3 = dataptr[3] + dataptr[4];
  //    tmp4 = dataptr[3] - dataptr[4];
      
   StartRow:
   		mov		eax, [esi][DATASIZE*0]
   		mov		ebx, [esi][DATASIZE*7]
   		
   		mov		edx, eax
   		add		eax, ebx	; eax = tmp0
   		
   		sub		edx, ebx	; edx = tmp7
    		mov		ebx, [esi][DATASIZE*3]
   
   		mov		ecx, [esi][DATASIZE*4]
   		mov		edi, ebx
   		
   		add		ebx, ecx	; ebx = tmp3
   		sub		edi, ecx	; edi = tmp4
   		
   		mov		tmp4, edi
   		mov		tmp7, edx
   		
      /* Even part per LL&M figure 1 --- note that published figure is faulty;
       * rotator "sqrt(2)*c1" should be "sqrt(2)*c6".
       */
      
  //    tmp10 = tmp0 + tmp3;
  //    tmp13 = tmp0 - tmp3;
  //    tmp11 = tmp1 + tmp2;
  //    tmp12 = tmp1 - tmp2;
      
  		mov		ecx, eax
  		add		eax, ebx	; eax = tmp10
  		
  		sub		ecx, ebx	; ecx = tmp13
    		mov		edx, [esi][DATASIZE*1] 
    		
    		mov		edi, [esi][DATASIZE*6]
    		mov		ebx, edx
    		
    		add		edx, edi	; edx = tmp1
    		sub		ebx, edi	; ebx = tmp6
    		
    		mov		tmp6, ebx
    		push	ebp
    		
    		mov		edi, [esi][DATASIZE*2]
    		mov		ebp, [esi][DATASIZE*5]
  
    		mov		ebx, edi
    		add		edi, ebp	; edi = tmp2
    		
    		sub		ebx, ebp	; ebx = tmp5
    		mov		ebp, edx
    		
    		add		edx, edi	; edx = tmp11
    		sub		ebp, edi	; ebp = tmp12
    		
  //    dataptr[0] = (DCTELEM) ((tmp10 + tmp11) << PASS1_BITS);
  //    dataptr[4] = (DCTELEM) ((tmp10 - tmp11) << PASS1_BITS);
      
  		mov		edi, eax
  		add		eax, edx	; eax = tmp10 + tmp11
  		
  		shl		eax, 2
  		sub		edi, edx	; edi = tmp10 - tmp11
  
  		shl		edi, 2
  		mov		[esi][DATASIZE*0], eax
  		
  		mov		[esi][DATASIZE*4], edi
  		mov		eax, ebp	; eax = tmp12
  		
  //    z1 = MULTIPLY(tmp12 + tmp13, FIX_0_541196100);
  
  		add		ebp, ecx	; eax = tmp12 + tmp13
  		add		esi, 32
  		
  		imul	ebp, FIX_0_541196100	; ebp = z1
  		
  //    dataptr[2] = (DCTELEM) DESCALE(z1 + MULTIPLY(tmp13, FIX_0_765366865),
  //				   CONST_BITS-PASS1_BITS);
  
  		imul	ecx, FIX_0_765366865
  		
  //    dataptr[6] = (DCTELEM) DESCALE(z1 + MULTIPLY(tmp12, - FIX_1_847759065),
  //				   CONST_BITS-PASS1_BITS);
      
  		imul	eax, FIX_1_847759065
  		
  		add		ecx, ebp		; add z1
  		xor		eax, 0xFFFFFFFF
  		
  		add		ecx, 1024		; rounding adj
  		inc		eax				; negate the result
  		
  		add		eax, ebp		; add z1
  		pop		ebp
  		
  		sar		ecx, 11
  		add		eax, 1024
  
  		mov		[esi][DATASIZE*2-32], ecx
  		mov		edi, tmp4
  		
  		sar		eax, 11
  		mov		ecx, tmp6
  
  		mov		[esi][DATASIZE*6-32], eax
  		push	esi
  		
      /* Odd part per figure 8 --- note paper omits factor of sqrt(2).
       * cK represents cos(K*pi/16).
       * i0..i3 in the paper are tmp4..tmp7 here.
       */
      
  //    z1 = tmp4 + tmp7;
  //    z2 = tmp5 + tmp6;
  //    z3 = tmp4 + tmp6;
  //    z4 = tmp5 + tmp7;
  
  		mov		edx, tmp7
  		mov		eax, edi	; edi = eax = tmp4
  		
  		mov		esi, edi	; esi = tmp4
  		add		edi, edx	; edi = z1
  
  		add		eax, ecx	; eax = z3
  		add		ecx, ebx	; ecx = z2
  		
  //    z1 = MULTIPLY(z1, - FIX_0_899976223); /* sqrt(2) * (c7-c3) */
  //    z2 = MULTIPLY(z2, - FIX_2_562915447); /* sqrt(2) * (-c1-c3) */
  
  		imul	edi, FIX_0_899976223
  
  		imul	ecx, FIX_2_562915447
  
  		xor		ecx, 0xFFFFFFFF
  		add		edx, ebx	; edx = z4
  
  //    tmp4 = MULTIPLY(tmp4, FIX_0_298631336); /* sqrt(2) * (-c1+c3+c5-c7) */
  //    tmp5 = MULTIPLY(tmp5, FIX_2_053119869); /* sqrt(2) * ( c1+c3-c5+c7) */
  
  		imul	esi, FIX_0_298631336
  
  		imul	ebx, FIX_2_053119869
  
  		xor		edi, 0xFFFFFFFF
  		inc		ecx			; ecx = z2
  
  		inc		edi			; edi = z1
  		add		ebx, ecx	; ebx = z2 + tmp5
  
  		add		esi, edi	; esi = z1 + tmp4
  		mov		tmp5, ebx
  
  //    z5 = MULTIPLY(z3 + z4, FIX_1_175875602); /* sqrt(2) * c3 */
  
  		mov		ebx, eax	; ebx = z3
  		add		eax, edx	; eax = z3 + z4
  
  		imul	eax, FIX_1_175875602
  
  //    z3 = MULTIPLY(z3, - FIX_1_961570560); /* sqrt(2) * (-c3-c5) */
  //    z4 = MULTIPLY(z4, - FIX_0_390180644); /* sqrt(2) * (c5-c3) */
      
  		imul	ebx, FIX_1_961570560
  
  		imul	edx, FIX_0_390180644
  
  		xor		ebx, 0xFFFFFFFF
  		xor		edx, 0xFFFFFFFF
  
  		inc		ebx		; ebx = z3
  		inc		edx		; edx = z4
  
  //    z3 += z5;
  //    z4 += z5;
  
  		add		ebx, eax	; ebx = z3
  		add		edx, eax	; edx = z4
      
  //    tmp6 = MULTIPLY(tmp6, FIX_3_072711026); /* sqrt(2) * ( c1+c3+c5-c7) */
  //    tmp7 = MULTIPLY(tmp7, FIX_1_501321110); /* sqrt(2) * ( c1+c3-c5-c7) */
  
  		mov		eax, tmp6
  		add		ecx, ebx	; ecx = z2 + z3
  
  		imul	eax, FIX_3_072711026
  
  		add		ecx, eax	; ecx = tmp6 + z2 + z3
  		mov		eax, tmp7
  
  		imul	eax, FIX_1_501321110
  
  //    dataptr[7] = (DCTELEM) DESCALE(tmp4 + z1 + z3, CONST_BITS-PASS1_BITS);
  //    dataptr[5] = (DCTELEM) DESCALE(tmp5 + z2 + z4, CONST_BITS-PASS1_BITS);
  //    dataptr[3] = (DCTELEM) DESCALE(tmp6 + z2 + z3, CONST_BITS-PASS1_BITS);
  //    dataptr[1] = (DCTELEM) DESCALE(tmp7 + z1 + z4, CONST_BITS-PASS1_BITS);
  
  		add		edi, edx	; edi = z1 + z4
  		add		ecx, 1024
  		
  		add		edi, eax	; edi = tmp7 + z1 + z4
  		mov		eax, tmp5	; eax = tmp5 + z2
  
  		add		ebx, esi	; ebx = tmp4 + z1 + z3
  		add		edx, eax	; edx = tmp5 + z2 + z4
  
  		sar		ecx, 11
  		add		ebx, 1024
  
  		sar		ebx, 11
  		pop		esi
  
  		add		edx, 1024
  		add		edi, 1024
  
  		sar		edx, 11
  		mov		[esi][DATASIZE*7-32], ebx
  
  		sar		edi, 11
  		mov		[esi][DATASIZE*3-32], ecx
  
  		mov		[esi][DATASIZE*5-32], edx
  		mov		ecx, counter
  
  		mov		[esi][DATASIZE*1-32], edi
  		dec		ecx
  
  		mov		counter, ecx
  		jnz		StartRow
      
  //    dataptr += DCTSIZE;		/* advance pointer to next row */
  //  }
  
    
    
    
    /* Pass 2: process columns.
     * We remove the PASS1_BITS scaling, but leave the results scaled up
     * by an overall factor of 8.
     */
  
  
  //  dataptr = data;
  		mov 	esi, [data]
  
  		mov		counter, 8
      
  //for (ctr = DCTSIZE-1; ctr >= 0; ctr--) {
  //    tmp0 = dataptr[DCTSIZE*0] + dataptr[DCTSIZE*7];
  //    tmp7 = dataptr[DCTSIZE*0] - dataptr[DCTSIZE*7];
  //    tmp1 = dataptr[DCTSIZE*1] + dataptr[DCTSIZE*6];
  //    tmp6 = dataptr[DCTSIZE*1] - dataptr[DCTSIZE*6];
  //    tmp2 = dataptr[DCTSIZE*2] + dataptr[DCTSIZE*5];
  //    tmp5 = dataptr[DCTSIZE*2] - dataptr[DCTSIZE*5];
  //    tmp3 = dataptr[DCTSIZE*3] + dataptr[DCTSIZE*4];
  //    tmp4 = dataptr[DCTSIZE*3] - dataptr[DCTSIZE*4];
  
   StartCol:
   		mov		eax, [esi][DCTWIDTH*0]
   		mov		ebx, [esi][DCTWIDTH*7]
   		
   		mov		edx, eax
   		add		eax, ebx	; eax = tmp0
   		
   		sub		edx, ebx	; edx = tmp7
    		mov		ebx, [esi][DCTWIDTH*3]
   
   		mov		ecx, [esi][DCTWIDTH*4]
   		mov		edi, ebx
   		
   		add		ebx, ecx	; ebx = tmp3
   		sub		edi, ecx	; edi = tmp4
   		
   		mov		tmp4, edi
   		mov		tmp7, edx
  
      /* Even part per LL&M figure 1 --- note that published figure is faulty;
       * rotator "sqrt(2)*c1" should be "sqrt(2)*c6".
       */
      
  //    tmp10 = tmp0 + tmp3;
  //    tmp13 = tmp0 - tmp3;
  //    tmp11 = tmp1 + tmp2;
  //    tmp12 = tmp1 - tmp2;
  
  		mov		ecx, eax	; ecx = tmp0
  		add		eax, ebx	; eax = tmp10
  		
  		sub		ecx, ebx	; ecx = tmp13
    		mov		edx, [esi][DCTWIDTH*1] 
    		
    		mov		edi, [esi][DCTWIDTH*6]
    		mov		ebx, edx
    		
    		add		edx, edi	; edx = tmp1
    		sub		ebx, edi	; ebx = tmp6
    		
    		mov		tmp6, ebx
    		push	ebp
    		
    		mov		edi, [esi][DCTWIDTH*2]
    		mov		ebp, [esi][DCTWIDTH*5]
  
    		mov		ebx, edi
    		add		edi, ebp	; edi = tmp2
    		
    		sub		ebx, ebp	; ebx = tmp5
  		mov		ebp, edx	; ebp = tmp1
  		
    		add		edx, edi	; edx = tmp11
   		sub		ebp, edi	; ebx = tmp12
  
  //    dataptr[DCTSIZE*0] = (DCTELEM) DESCALE(tmp10 + tmp11, PASS1_BITS);
  //    dataptr[DCTSIZE*4] = (DCTELEM) DESCALE(tmp10 - tmp11, PASS1_BITS);
  
   		add		eax, 2			; adj for rounding
  
  		mov		edi, eax
  		add		eax, edx	; eax = tmp10 + tmp11
  		
  		sar		eax, 2
  		sub		edi, edx	; edi = tmp10 - tmp11
  
  		sar		edi, 2
  		mov		[esi][DCTWIDTH*0], eax
  		
  		mov		[esi][DCTWIDTH*4], edi
  		mov		eax, ebp	; eax = tmp12
  		
  //    z1 = MULTIPLY(tmp12 + tmp13, FIX_0_541196100);
  
  		add		ebp, ecx	; eax = tmp12 + tmp13
  		add		esi, 4
  		
  		imul	ebp, FIX_0_541196100	; ebp = z1
      
  //    dataptr[DCTSIZE*2] = (DCTELEM) DESCALE(z1 + MULTIPLY(tmp13, FIX_0_765366865),
  //					   CONST_BITS+PASS1_BITS);
  
  		imul	ecx, FIX_0_765366865
  		
  //    dataptr[DCTSIZE*6] = (DCTELEM) DESCALE(z1 + MULTIPLY(tmp12, - FIX_1_847759065),
  //					   CONST_BITS+PASS1_BITS);
      
  		imul	eax, FIX_1_847759065
  		
  		add		ecx, ebp		; add z1
  		xor		eax, 0xFFFFFFFF
  		
  		add		ecx, 16384		; rounding adj
  		inc		eax				; negate the result
  		
  		add		eax, ebp		; add z1
  		pop		ebp
  		
  		sar		ecx, 15
  		add		eax, 16384
  
  		mov		[esi][DCTWIDTH*2-4], ecx
  		mov		edi, tmp4
  		
  		sar		eax, 15
  		mov		ecx, tmp6
  
  		mov		[esi][DCTWIDTH*6-4], eax
  		push	esi
  
      /* Odd part per figure 8 --- note paper omits factor of sqrt(2).
       * cK represents cos(K*pi/16).
       * i0..i3 in the paper are tmp4..tmp7 here.
       */
      
  //    z1 = tmp4 + tmp7;
  //    z2 = tmp5 + tmp6;
  //    z3 = tmp4 + tmp6;
  //    z4 = tmp5 + tmp7;
  
  		mov		edx, tmp7
  		mov		eax, edi	; edi = eax = tmp4
  		
  		mov		esi, edi	; esi = tmp4
  		add		edi, edx	; edi = z1
  
  		add		eax, ecx	; eax = z3
  		add		ecx, ebx	; ecx = z2
  
  //    z1 = MULTIPLY(z1, - FIX_0_899976223); /* sqrt(2) * (c7-c3) */
  //    z2 = MULTIPLY(z2, - FIX_2_562915447); /* sqrt(2) * (-c1-c3) */
  
  		imul	edi, FIX_0_899976223
  
  		imul	ecx, FIX_2_562915447
  
  		xor		ecx, 0xFFFFFFFF
  		add		edx, ebx	; edx = z4
  
  //    tmp4 = MULTIPLY(tmp4, FIX_0_298631336); /* sqrt(2) * (-c1+c3+c5-c7) */
  //    tmp5 = MULTIPLY(tmp5, FIX_2_053119869); /* sqrt(2) * ( c1+c3-c5+c7) */
  
  		imul	esi, FIX_0_298631336
  
  		imul	ebx, FIX_2_053119869
  
  		xor		edi, 0xFFFFFFFF
  		inc		ecx			; ecx = z2
  
  		inc		edi			; edi = z1
  		add		ebx, ecx	; ebx = z2 + tmp5
  
  		add		esi, edi	; esi = z1 + tmp4
  		mov		tmp5, ebx
  
  //    z5 = MULTIPLY(z3 + z4, FIX_1_175875602); /* sqrt(2) * c3 */
      
  		mov		ebx, eax	; ebx = z3
  		add		eax, edx	; eax = z3 + z4
  
  		imul	eax, FIX_1_175875602
  
  //    z3 = MULTIPLY(z3, - FIX_1_961570560); /* sqrt(2) * (-c3-c5) */
  //    z4 = MULTIPLY(z4, - FIX_0_390180644); /* sqrt(2) * (c5-c3) */
      
  		imul	ebx, FIX_1_961570560
  
  		imul	edx, FIX_0_390180644
  
  		xor		ebx, 0xFFFFFFFF
  		xor		edx, 0xFFFFFFFF
  
  		inc		ebx		; ebx = z3
  		inc		edx		; edx = z4
  
  //    z3 += z5;
  //    z4 += z5;
  
  		add		ebx, eax	; ebx = z3
  		add		edx, eax	; edx = z4
      
  //    tmp6 = MULTIPLY(tmp6, FIX_3_072711026); /* sqrt(2) * ( c1+c3+c5-c7) */
  //    tmp7 = MULTIPLY(tmp7, FIX_1_501321110); /* sqrt(2) * ( c1+c3-c5-c7) */
  
  		mov		eax, tmp6
  		add		ecx, ebx	; ecx = z2 + z3
  
  		imul	eax, FIX_3_072711026
  
  		add		ecx, eax	; ecx = tmp6 + z2 + z3
  		mov		eax, tmp7
  
  		imul	eax, FIX_1_501321110
  
  //    dataptr[DCTSIZE*7] = (DCTELEM) DESCALE(tmp4 + z1 + z3,
  //					   CONST_BITS+PASS1_BITS);
  //    dataptr[DCTSIZE*5] = (DCTELEM) DESCALE(tmp5 + z2 + z4,
  //					   CONST_BITS+PASS1_BITS);
  //    dataptr[DCTSIZE*3] = (DCTELEM) DESCALE(tmp6 + z2 + z3,
  //					   CONST_BITS+PASS1_BITS);
  //    dataptr[DCTSIZE*1] = (DCTELEM) DESCALE(tmp7 + z1 + z4,
  //					   CONST_BITS+PASS1_BITS);
  
  		add		edi, edx	; edi = z1 + z4
  		add		ecx, 16384
  		
  		add		edi, eax	; edi = tmp7 + z1 + z4
  		mov		eax, tmp5	; eax = tmp5 + z2
  
  		add		ebx, esi	; ebx = tmp4 + z1 + z3
  		add		edx, eax	; edx = tmp5 + z2 + z4
  
  		sar		ecx, 15
  		add		ebx, 16384
  
  		sar		ebx, 15
  		pop		esi
  
  		add		edx, 16384
  		add		edi, 16384
  
  		sar		edx, 15
  		mov		[esi][DCTWIDTH*7-4], ebx
  
  		sar		edi, 15
  		mov		[esi][DCTWIDTH*3-4], ecx
  
  		mov		[esi][DCTWIDTH*5-4], edx
  		mov		ecx, counter
  
  		mov		[esi][DCTWIDTH*1-4], edi
  		dec		ecx
  
  		mov		counter, ecx
  		jnz		StartCol
    } //end asm
  
  //    dataptr++;			/* advance pointer to next column */
  //  }
  }
  
  #endif /* X86 */
  #endif /* DCT_ISLOW_SUPPORTED */
  