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Optimize multiplication by zero

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This commit is contained in:
Colin Leroy-Mira
2023-11-05 21:03:06 +01:00
parent fe115fb621
commit cff611711b
2 changed files with 14 additions and 1 deletions
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14
src/cc65/codegen.c
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@@ -2726,7 +2726,12 @@ void g_mul (unsigned flags, unsigned long val)
if (flags & CF_FORCECHAR) {
/* Handle some special cases */
switch (val) {
case 0:
AddCodeLine ("lda #$00");
return;
case 1:
/* Nothing to do */
return;
case 3:
AddCodeLine ("sta tmp1");
AddCodeLine ("asl a");
@@ -2764,6 +2769,13 @@ void g_mul (unsigned flags, unsigned long val)
case CF_INT:
switch (val) {
case 0:
AddCodeLine ("lda #$00");
AddCodeLine ("tax");
return;
case 1:
/* Nothing to do */
return;
case 3:
AddCodeLine ("jsr mulax3");
return;