mirror of https://github.com/cc65/cc65.git
97 lines
3.6 KiB
C
97 lines
3.6 KiB
C
/*****************************************************************************/
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/* */
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/* coptunary.h */
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/* */
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/* Optimize bitwise unary sequences */
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/* */
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/* */
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/* */
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/* (C) 2001-2012, 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 COPTUNARY_H
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#define COPTUNARY_H
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/* cc65 */
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#include "codeseg.h"
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/*****************************************************************************/
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/* negax optimizations */
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/*****************************************************************************/
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unsigned OptNegAX1 (CodeSeg* S);
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/* Search for a call to negax and replace it by
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**
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** eor #$FF
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** clc
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** adc #$01
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**
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** if X isn't used later.
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*/
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unsigned OptNegAX2 (CodeSeg* S);
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/* Search for a call to negax and replace it by
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**
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** ldx #$FF
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** eor #$FF
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** clc
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** adc #$01
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** bcc L1
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** inx
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** L1:
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**
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** if X is known and zero on entry.
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*/
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/*****************************************************************************/
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/* complax optimizations */
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/*****************************************************************************/
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unsigned OptComplAX1 (CodeSeg* S);
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/* Search for a call to complax and replace it by
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**
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** eor #$FF
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**
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** if X isn't used later.
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*/
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/* End of coptunary.h */
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#endif
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