/*****************************************************************************/
/*                                                                           */
/*                                 coptadd.h                                 */
/*                                                                           */
/*                        Optimize addition sequences                        */
/*                                                                           */
/*                                                                           */
/*                                                                           */
/* (C) 2001-2005, Ullrich von Bassewitz                                      */
/*                Römerstrasse 52                                            */
/*                D-70794 Filderstadt                                        */
/* EMail:         uz@cc65.org                                                */
/*                                                                           */
/*                                                                           */
/* This software is provided 'as-is', without any expressed 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.                                                          */
/*                                                                           */
/*****************************************************************************/



#ifndef COPTADD_H
#define COPTADD_H



/* cc65 */
#include "codeseg.h"



/*****************************************************************************/
/*                            Optimize additions                             */
/*****************************************************************************/



unsigned OptAdd1 (CodeSeg* S);
/* Search for the sequence
 *
 *      jsr     pushax
 *      ldy     xxx
 *      ldx     #$00
 *      lda     (sp),y
 *      jsr     tosaddax
 *
 * and replace it by:
 *
 *      ldy     xxx-2
 *      clc
 *      adc     (sp),y
 *      bcc     L
 *      inx
 * L:
 */

unsigned OptAdd2 (CodeSeg* S);
/* Search for the sequence
 *
 *      ldy     #xx
 *      lda     (sp),y
 *      tax
 *      dey
 *      lda     (sp),y
 *      ldy     #$yy
 *      jsr     addeqysp
 *
 * and replace it by:
 *
 *      ldy     #xx-1
 *      lda     (sp),y
 *      ldy     #yy
 *      clc
 *      adc     (sp),y
 *      sta     (sp),y
 *      ldy     #xx
 *      lda     (sp),y
 *      ldy     #yy+1
 *      adc     (sp),y
 *      sta     (sp),y
 *
 * provided that a/x is not used later.
 */

unsigned OptAdd3 (CodeSeg* S);
/* Search for the sequence
 *
 *      jsr     pushax
 *      ldx     #$00
 *      lda     xxx
 *      jsr     tosaddax
 *
 * and replace it by
 *
 *      clc
 *      adc     xxx
 *      bcc     L1
 *      inx
 * L1:
 */                           

unsigned OptAdd4 (CodeSeg* S);
/* Search for the sequence
 *
 *      jsr     pushax
 *      lda     xxx
 *      ldx     yyy
 *      jsr     tosaddax
 *
 * and replace it by
 *
 *      clc
 *      adc     xxx
 *      pha
 *      txa
 *      adc     yyy
 *      tax
 *      pla
 */

unsigned OptAdd5 (CodeSeg* S);
/* Search for a call to incaxn and replace it by an 8 bit add if the X register
 * is not used later.
 */

unsigned OptAdd6 (CodeSeg* S);
/* Search for the sequence
 *
 *      adc     ...
 *      bcc     L
 *      inx
 * L:
 *
 * and remove the handling of the high byte if X is not used later.
 */



/* End of coptadd.h */

#endif



