1 /*****************************************************************************/
5 /* Optimize negation sequences */
9 /* (C) 2001 Ullrich von Bassewitz */
11 /* D-70597 Stuttgart */
12 /* EMail: uz@cc65.org */
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. */
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: */
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 */
32 /*****************************************************************************/
46 /*****************************************************************************/
47 /* nega optimizations */
48 /*****************************************************************************/
52 unsigned OptNegA1 (CodeSeg* S);
59 * Remove the ldx if the lda does not use it.
62 unsigned OptNegA2 (CodeSeg* S);
69 * Adjust the conditional branch and remove the call to the subroutine.
74 /*****************************************************************************/
75 /* negax optimizations */
76 /*****************************************************************************/
80 unsigned OptNegAX1 (CodeSeg* S);
81 /* On a call to bnegax, if X is zero, the result depends only on the value in
82 * A, so change the call to a call to bnega. This will get further optimized
86 unsigned OptNegAX2 (CodeSeg* S);
87 /* Search for the sequence:
104 unsigned OptNegAX3 (CodeSeg* S);
105 /* Search for the sequence:
119 unsigned OptNegAX4 (CodeSeg* S);
120 /* Search for the sequence:
135 /* End of coptneg.h */