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   1 /*****************************************************************************/
   2 /*                                                                           */
   3 /*                               coptptrstore.h                              */
   4 /*                                                                           */
   5 /*                      Optimize stores through pointers                     */
   6 /*                                                                           */
   7 /*                                                                           */
   8 /*                                                                           */
   9 /* (C) 2012,      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 COPTPTRSTORE_H
  37 #define COPTPTRSTORE_H
  38
  39
  40
  41 /* cc65 */
  42 #include "codeseg.h"
  43
  44
  45
  46 /*****************************************************************************/
  47 /*                                   Code                                    */
  48 /*****************************************************************************/
  49
  50
  51
  52 unsigned OptPtrStore1 (CodeSeg* S);
  53 /* Search for the sequence:
  54  *
  55  *      lda     #<(label+0)
  56  *      ldx     #>(label+0)
  57  *      clc
  58  *      adc     xxx
  59  *      bcc     L
  60  *      inx
  61  * L:   jsr     pushax
  62  *      ldx     #$00
  63  *      lda     yyy
  64  *      ldy     #$00
  65  *      jsr     staspidx
  66  *
  67  * and replace it by:
  68  *
  69  *      ldy     xxx
  70  *      ldx     #$00
  71  *      lda     yyy
  72  *      sta     label,y
  73  */
  74
  75 unsigned OptPtrStore2 (CodeSeg* S);
  76 /* Search for the sequence:
  77  *
  78  *      lda     #<(label+0)
  79  *      ldx     #>(label+0)
  80  *      ldy     aaa
  81  *      clc
  82  *      adc     (sp),y
  83  *      bcc     L
  84  *      inx
  85  * L:   jsr     pushax
  86  *      ldx     #$00
  87  *      lda     yyy
  88  *      ldy     #$00
  89  *      jsr     staspidx
  90  *
  91  * and replace it by:
  92  *
  93  *      ldy     aaa
  94  *      ldx     #$00
  95  *      lda     (sp),y
  96  *      tay
  97  *      lda     yyy
  98  *      sta     label,y
  99  */
 100
 101 unsigned OptPtrStore3 (CodeSeg* S);
 102 /* Search for the sequence:
 103  *
 104  *      lda     #<(label+0)
 105  *      ldx     #>(label+0)
 106  *      ldy     aaa
 107  *      clc
 108  *      adc     (sp),y
 109  *      bcc     L
 110  *      inx
 111  * L:   jsr     pushax
 112  *      ldy     #bbb
 113  *      ldx     #$00
 114  *      lda     (sp),y
 115  *      ldy     #$00
 116  *      jsr     staspidx
 117  *
 118  * and replace it by:
 119  *
 120  *      ldy     aaa
 121  *      lda     (sp),y
 122  *      tax
 123  *      ldy     #bbb-2
 124  *      lda     (sp),y
 125  *      sta     label,x
 126  *      ldx     #$00
 127  */
 128
 129 unsigned OptPtrStore4 (CodeSeg* S);
 130 /* Search for the sequence:
 131  *
 132  *      ldy     #offs1
 133  *      clc
 134  *      adc     (sp),y
 135  *      bcc     L
 136  *      inx
 137  * L:   jsr     pushax
 138  *      ldy     #offs2
 139  *      ldx     #$00
 140  *      lda     (sp),y
 141  *      ldy     #$00
 142  *      jsr     staspidx
 143  *
 144  * and replace it by:
 145  *
 146  *      sta     ptr1
 147  *      stx     ptr1+1
 148  *      ldx     #$00
 149  *      ldy     #offs2-2
 150  *      lda     (sp),y
 151  *      ldy     #offs1
 152  *      sta     (ptr1),y
 153  */
 154
 155 unsigned OptPtrStore5 (CodeSeg* S);
 156 /* Search for the sequence:
 157  *
 158  *      jsr     pushax
 159  *      ldy     xxx
 160  *      jsr     ldauidx
 161  *      subop
 162  *      ldy     yyy
 163  *      jsr     staspidx
 164  *
 165  * and replace it by:
 166  *
 167  *      sta     ptr1
 168  *      stx     ptr1+1
 169  *      ldy     xxx
 170  *      ldx     #$00
 171  *      lda     (ptr1),y
 172  *      subop
 173  *      ldy     yyy
 174  *      sta     (ptr1),y
 175  *
 176  * In case a/x is loaded from the register bank before the pushax, we can even
 177  * use the register bank instead of ptr1.
 178  *
 179  *
 180  *      jsr     pushax
 181  *      ldy     xxx
 182  *      jsr     ldauidx
 183  *      ldx     #$00
 184  *      lda     (zp),y
 185  *      subop
 186  *      ldy     yyy
 187  *      sta     (zp),y
 188  *      jsr     staspidx
 189  */
 190
 191
 192
 193 /* End of coptptrstore.h */
 194 #endif
 195
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 198