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83 lines
3.3 KiB
C
83 lines
3.3 KiB
C
/*****************************************************************************/
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/* */
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/* coptpush.h */
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/* */
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/* Optimize push sequences */
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/* */
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/* */
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/* */
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/* (C) 2001-2002 Ullrich von Bassewitz */
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/* Wacholderweg 14 */
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/* D-70597 Stuttgart */
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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 COPTPUSH_H
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#define COPTPUSH_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 OptPush1 (CodeSeg* S);
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/* Given a sequence
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**
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** jsr ldaxysp
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** jsr pushax
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**
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** If a/x are not used later, and Y is known, replace that by
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**
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** ldy #xx+2
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** jsr pushwysp
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** ldy #$00 ; present if later code expects Y = 0
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**
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** saving several cycles.
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*/
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unsigned OptPush2 (CodeSeg* S);
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/* A sequence
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**
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** jsr ldaxidx
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** jsr pushax
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**
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** may get replaced by
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**
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** jsr pushwidx
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*/
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/* End of coptpush.h */
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#endif
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