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Merge pull request #2269 from colinleroy/optimize_gt_255

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Optimize unsigned int and long > 255
This commit is contained in:
Bob Andrews
2023-11-28 14:36:39 +01:00
committed by GitHub
parent ad0b778008 3066b1f9b4
commit acf159adbc
2 changed files with 98 additions and 5 deletions
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18
src/cc65/codegen.c
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@@ -4199,10 +4199,14 @@ void g_gt (unsigned flags, unsigned long val)
*/
g_ne (flags, val);
} else if (val < 0xFFFF) {
/* Use >= instead of > because the former gives better
** code on the 6502 than the latter.
*/
g_ge (flags, val+1);
if (val == 0xFF) {
AddCodeLine ("cpx #$00");
} else {
/* Use >= instead of > because the former gives better
** code on the 6502 than the latter.
*/
g_ge (flags, val+1);
}
} else {
/* Never true */
Warning ("Condition is never true");
@@ -4229,6 +4233,8 @@ void g_gt (unsigned flags, unsigned long val)
** is easier to optimize.
*/
g_ne (flags, val);
} else if (val == 0xFF) {
AddCodeLine ("cpx #$00");
} else if (val < 0xFFFFFFFF) {
/* Use >= instead of > because the former gives better
** code on the 6502 than the latter.
@@ -4241,7 +4247,9 @@ void g_gt (unsigned flags, unsigned long val)
}
} else {
/* Signed compare */
if ((long) val < 0x7FFFFFFF) {
if (val == 0xFF) {
AddCodeLine ("cpx #$00");
} else if ((long) val < 0x7FFFFFFF) {
g_ge (flags, val+1);
} else {
/* Never true */