mirror of https://github.com/cc65/cc65.git
179 lines
5.0 KiB
C
179 lines
5.0 KiB
C
/*****************************************************************************/
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/* */
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/* coptptrstore.h */
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/* */
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/* Optimize stores through pointers */
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/* */
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/* */
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/* */
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/* (C) 2012, 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 COPTPTRSTORE_H
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#define COPTPTRSTORE_H
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/* cc65 */
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#include "codeseg.h"
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/*****************************************************************************/
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/* Code */
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/*****************************************************************************/
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unsigned OptPtrStore1 (CodeSeg* S);
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/* Search for the sequence:
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**
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** clc
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** adc xxx
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** bcc L
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** inx
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** L: jsr pushax
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** ldx #$00
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** lda yyy
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** ldy #$00
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** jsr staspidx
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**
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** and replace it by:
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**
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** sta ptr1
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** stx ptr1+1
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** ldy xxx
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** ldx #$00
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** lda yyy
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** sta (ptr1),y
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**
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** or by
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**
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** ldy xxx
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** ldx #$00
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** lda yyy
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** sta (zp),y
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**
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** or by
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**
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** ldy xxx
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** ldx #$00
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** lda yyy
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** sta label,y
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**
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** or by
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**
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** ldy xxx
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** ldx #$00
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** lda yyy
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** sta $xxxx,y
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**
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** depending on the two instructions preceeding the sequence above.
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*/
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unsigned OptPtrStore2 (CodeSeg* S);
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/* Search for the sequence:
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**
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** clc
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** adc xxx
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** bcc L
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** inx
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** L: jsr pushax
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** ldy yyy
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** ldx #$00
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** lda (sp),y
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** ldy #$00
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** jsr staspidx
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**
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** and replace it by:
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**
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** sta ptr1
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** stx ptr1+1
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** ldy yyy-2
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** ldx #$00
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** lda (sp),y
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** ldy xxx
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** sta (ptr1),y
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**
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** or by
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**
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** ldy yyy-2
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** ldx #$00
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** lda (sp),y
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** ldy xxx
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** sta (zp),y
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**
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** or by
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**
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** ldy yyy-2
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** ldx #$00
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** lda (sp),y
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** ldy xxx
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** sta label,y
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**
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** or by
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**
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** ldy yyy-2
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** ldx #$00
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** lda (sp),y
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** ldy xxx
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** sta $xxxx,y
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**
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** depending on the code preceeding the sequence above.
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*/
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unsigned OptPtrStore3 (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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** jsr ldauidx
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** subop
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** ldy yyy
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** jsr staspidx
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**
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** and replace it by:
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**
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** sta ptr1
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** stx ptr1+1
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** ldy xxx
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** ldx #$00
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** lda (ptr1),y
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** subop
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** ldy yyy
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** sta (ptr1),y
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**
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** In case a/x is loaded from the register bank before the pushax, we can even
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** use the register bank instead of ptr1.
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*/
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/* End of coptptrstore.h */
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#endif
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