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156 lines
4.5 KiB
C
156 lines
4.5 KiB
C
/*****************************************************************************/
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/* */
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/* coptadd.h */
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/* */
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/* Optimize addition sequences */
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/* */
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/* */
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/* */
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/* (C) 2001-2005, Ullrich von Bassewitz */
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/* Roemerstrasse 52 */
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/* D-70794 Filderstadt */
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/* EMail: uz@cc65.org */
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/* */
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/* */
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/* This software is provided 'as-is', without any expressed or implied */
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/* warranty. In no event will the authors be held liable for any damages */
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/* arising from the use of this software. */
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/* */
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/* Permission is granted to anyone to use this software for any purpose, */
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/* including commercial applications, and to alter it and redistribute it */
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/* freely, subject to the following restrictions: */
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/* */
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/* 1. The origin of this software must not be misrepresented; you must not */
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/* claim that you wrote the original software. If you use this software */
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/* in a product, an acknowledgment in the product documentation would be */
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/* appreciated but is not required. */
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/* 2. Altered source versions must be plainly marked as such, and must not */
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/* be misrepresented as being the original software. */
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/* 3. This notice may not be removed or altered from any source */
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/* distribution. */
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/* */
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/*****************************************************************************/
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#ifndef COPTADD_H
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#define COPTADD_H
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/* cc65 */
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#include "codeseg.h"
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/*****************************************************************************/
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/* Optimize additions */
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/*****************************************************************************/
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unsigned OptAdd1 (CodeSeg* S);
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/* Search for the sequence
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**
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** jsr pushax
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** ldy xxx
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** ldx #$00
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** lda (sp),y
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** jsr tosaddax
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**
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** and replace it by:
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**
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** ldy xxx-2
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** clc
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** adc (sp),y
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** bcc L
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** inx
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** L:
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*/
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unsigned OptAdd2 (CodeSeg* S);
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/* Search for the sequence
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**
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** ldy #xx
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** lda (sp),y
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** tax
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** dey
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** lda (sp),y
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** ldy #$yy
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** jsr addeqysp
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**
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** and replace it by:
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**
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** ldy #xx-1
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** lda (sp),y
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** ldy #yy
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** clc
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** adc (sp),y
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** sta (sp),y
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** ldy #xx
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** lda (sp),y
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** ldy #yy+1
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** adc (sp),y
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** sta (sp),y
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**
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** provided that a/x is not used later.
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*/
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unsigned OptAdd3 (CodeSeg* S);
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/* Search for the sequence
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**
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** jsr pushax
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** ldx #$00
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** lda xxx
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** jsr tosaddax
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**
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** and replace it by
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**
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** clc
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** adc xxx
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** bcc L1
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** inx
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** L1:
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*/
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unsigned OptAdd4 (CodeSeg* S);
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/* Search for the sequence
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**
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** jsr pushax
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** lda xxx
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** ldx yyy
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** jsr tosaddax
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**
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** and replace it by
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**
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** clc
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** adc xxx
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** pha
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** txa
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** adc yyy
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** tax
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** pla
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*/
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unsigned OptAdd5 (CodeSeg* S);
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/* Search for a call to incaxn and replace it by an 8 bit add if the X register
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** is not used later.
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*/
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unsigned OptAdd6 (CodeSeg* S);
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/* Search for the sequence
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**
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** adc ...
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** bcc L
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** inx
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** L:
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**
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** and remove the handling of the high byte if X is not used later.
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*/
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/* End of coptadd.h */
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#endif
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