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Added special multiplication routines

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git-svn-id: svn://svn.cc65.org/cc65/trunk@1012 b7a2c559-68d2-44c3-8de9-860c34a00d81
This commit is contained in:
cuz
2001-10-04 21:34:14 +00:00
parent 560ac0ac43
commit 0fdf581d06
6 changed files with 188 additions and 36 deletions
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83
src/cc65/codegen.c
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@@ -2526,7 +2526,7 @@ void g_mul (unsigned flags, unsigned long val)
if (flags & CF_CONST && (p2 = powerof2 (val)) >= 0) {
/* Generate a shift instead */
g_asl (flags, p2);
return;
return;
}
/* If the right hand side is const, the lhs is not on stack but still
@@ -2538,50 +2538,61 @@ void g_mul (unsigned flags, unsigned long val)
case CF_CHAR:
if (flags & CF_FORCECHAR) {
/* Handle some special cases */
switch (val) {
/* Handle some special cases */
switch (val) {
case 3:
AddCodeLine ("sta tmp1");
AddCodeLine ("asl a");
AddCodeLine ("clc");
AddCodeLine ("adc tmp1");
return;
case 5:
AddCodeLine ("sta tmp1");
AddCodeLine ("asl a");
AddCodeLine ("asl a");
AddCodeLine ("clc");
case 3:
AddCodeLine ("sta tmp1");
AddCodeLine ("asl a");
AddCodeLine ("clc");
AddCodeLine ("adc tmp1");
return;
return;
case 10:
AddCodeLine ("sta tmp1");
AddCodeLine ("asl a");
AddCodeLine ("asl a");
AddCodeLine ("clc");
AddCodeLine ("adc tmp1");
AddCodeLine ("asl a");
return;
}
case 5:
AddCodeLine ("sta tmp1");
AddCodeLine ("asl a");
AddCodeLine ("asl a");
AddCodeLine ("clc");
AddCodeLine ("adc tmp1");
return;
case 10:
AddCodeLine ("sta tmp1");
AddCodeLine ("asl a");
AddCodeLine ("asl a");
AddCodeLine ("clc");
AddCodeLine ("adc tmp1");
AddCodeLine ("asl a");
return;
}
}
/* FALLTHROUGH */
case CF_INT:
break;
case CF_INT:
switch (val) {
case 3:
AddCodeLine ("jsr mulax3");
return;
case 5:
AddCodeLine ("jsr mulax5");
return;
case 10:
AddCodeLine ("jsr mulax10");
return;
}
break;
case CF_LONG:
break;
case CF_LONG:
break;
default:
typeerror (flags);
}
default:
typeerror (flags);
}
/* If we go here, we didn't emit code. Push the lhs on stack and fall
* into the normal, non-optimized stuff.
*/
flags &= ~CF_FORCECHAR; /* Handle chars as ints */
/* If we go here, we didn't emit code. Push the lhs on stack and fall
* into the normal, non-optimized stuff.
*/
flags &= ~CF_FORCECHAR; /* Handle chars as ints */
g_push (flags & ~CF_CONST, 0);
}