1/*****************************************************************************/
2/* */
3/* copttest.h */
4/* */
5/* Optimize test sequences */
6/* */
7/* */
8/* */
9/* (C) 2001-2009, Ullrich von Bassewitz */
10/* Roemerstrasse 52 */
11/* D-70794 Filderstadt */
12/* EMail: uz@cc65.org */
13/* */
14/* */
15/* This software is provided 'as-is', without any expressed or implied */
16/* warranty. In no event will the authors be held liable for any damages */
17/* arising from the use of this software. */
18/* */
19/* Permission is granted to anyone to use this software for any purpose, */
20/* including commercial applications, and to alter it and redistribute it */
21/* freely, subject to the following restrictions: */
22/* */
23/* 1. The origin of this software must not be misrepresented; you must not */
24/* claim that you wrote the original software. If you use this software */
25/* in a product, an acknowledgment in the product documentation would be */
26/* appreciated but is not required. */
27/* 2. Altered source versions must be plainly marked as such, and must not */
28/* be misrepresented as being the original software. */
29/* 3. This notice may not be removed or altered from any source */
30/* distribution. */
31/* */
32/*****************************************************************************/
33
34
35
36#ifndef COPTTEST_H
37#define COPTTEST_H
38
39
40
41/* cc65 */
42#include "codeseg.h"
43
44
45
46/*****************************************************************************/
47/* Optimize tests */
48/*****************************************************************************/
49
50
51
52unsigned OptTest1 (CodeSeg* S);
53/* Given a sequence
54**
55** stx xxx
56** ora xxx
57** beq/bne ...
58**
59** If X is zero, the sequence may be changed to
60**
61** cmp #$00
62** beq/bne ...
63**
64** which may be optimized further by another step.
65**
66** If A is zero, the sequence may be changed to
67**
68** txa
69** beq/bne ...
70*/
71
72unsigned OptTest2 (CodeSeg* S);
73/* Search for an inc/dec operation followed by a load and a conditional
74** branch based on the flags from the load. Remove the load if the insn
75** isn't used later.
76*/
77
78
79
80/* End of copttest.h */
81
82#endif
83