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Added some patterns

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This commit is contained in:
ceriel 1989-03-01 11:28:49 +00:00
parent a22bbe847f
commit da2ba8e093
1 changed files with 46 additions and 0 deletions
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46
mach/m68020/top/table
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@ -132,6 +132,19 @@ blt L1 : bra L2: labdef L1 -> bge L2 : labdef L1 ;
ble L1 : bra L2: labdef L1 -> bgt L2 : labdef L1 ;
bne L1 : bra L2: labdef L1 -> beq L2 : labdef L1 ;
move.l A, B : bra LAB : labdef L1 : move.l A, B : labdef LAB
-> labdef L1 : move.l A, B :
labdef LAB ;
/* some strength reduction */
mulu.l #NUM,DREG -> muls.l #NUM,DREG ;
muls.l #NUM,DREG
{is_shift_twice(NUM,X,Y)} -> asl.l #X,DREG :
move.l DREG,-(sp) :
asl.l #Y,DREG :
add.l (sp)+,DREG ;
asl.l #0,DREG -> ;
asl.l #1,DREG -> add.l DREG,DREG ;
%%;
/* auxiliary routines: */
@ -151,6 +164,39 @@ int no_side_effects(s)
}
int is_shift_twice(s, c1, c2)
char *s, *c1, *c2;
{
long atol();
register int i = 0;
long val = atol(s), pow = 1;
while (i <= 8) {
if (pow & val) {
val -= pow;
sprintf(c1, "%d", i);
break;
}
pow <<= 1;
i++;
}
if (pow > 0 && val) {
i = 0;
while (i <= 8) {
if (pow & val) {
val -= pow;
sprintf(c2, "%d", i);
if (val == 0) return 1;
break;
}
pow <<= 1;
i++;
}
}
return 0;
}
int is_dreg(s)
register char *s;
{