mirror of https://github.com/cc65/cc65.git
112 lines
4.1 KiB
C
112 lines
4.1 KiB
C
/*****************************************************************************/
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/* */
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/* coptstore.h */
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/* */
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/* Optimize stores */
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/* */
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/* */
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/* */
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/* (C) 2002-2006, 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 COPTSTORE_H
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#define COPTSTORE_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 OptStore1 (CodeSeg* S);
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/* Search for the sequence
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**
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** ldy #n
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** jsr staxysp
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** ldy #n+1
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** jsr ldaxysp
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**
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** and remove the useless load, provided that the next insn doesn't use flags
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** from the load.
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*/
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unsigned OptStore2 (CodeSeg* S);
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/* Search for a call to staxysp. If the ax register is not used later, and
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** the value is constant, just use the A register and store directly into the
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** stack.
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*/
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unsigned OptStore3 (CodeSeg* S);
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/* Search for a call to steaxysp. If the eax register is not used later, and
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** the value is constant, just use the A register and store directly into the
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** stack.
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*/
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unsigned OptStore4 (CodeSeg* S);
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/* Search for the sequence
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**
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** sta xx
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** stx yy
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** lda xx
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** ldx yy
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**
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** and remove the useless load, provided that the next insn doesn't use flags
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** from the load.
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*/
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unsigned OptStore5 (CodeSeg* S);
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/* Search for the sequence
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**
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** lda foo
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** ldx bar
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** sta something
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** stx something-else
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**
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** and replace it by
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**
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** lda foo
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** sta something
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** lda bar
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** sta something-else
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**
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** if X is not used later. This replacement doesn't save any cycles or bytes,
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** but it keeps the value of X, which may be reused later.
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*/
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/* End of coptstore.h */
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#endif
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