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Remove dead labels when jump threading.

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This lets the dead block removal do a better job.
This commit is contained in:
Bill Currie 2012-05-03 19:32:44 +09:00
parent ab73a267cd
commit 6900907129
1 changed files with 12 additions and 10 deletions

22
tools/qfcc/source/statements.c
View file

@ -1026,6 +1026,7 @@ remove_label_from_dest (ex_label_t *label)
if (!label)
return;
debug (0, "dropping deceased label %s", label->name);
sblock = label->dest;
for (l = &sblock->labels; *l; l = &(*l)->next) {
if (*l == label) {
@ -1040,29 +1041,30 @@ static void
thread_jumps (sblock_t *blocks)
{
sblock_t *sblock;
ex_label_t *label, *l;
statement_t *s;
if (!blocks)
return;
for (sblock = blocks; sblock->next; sblock = sblock->next) {
statement_t *s;
ex_label_t **label, *l;
s = (statement_t *) sblock->tail;
if (!strcmp (s->opcode, "<GOTO>"))
label = s->opa->o.label;
label = &s->opa->o.label;
else if (!strncmp (s->opcode, "<IF", 3))
label = s->opb->o.label;
label = &s->opb->o.label;
else
continue;
for (l = label;
for (l = *label;
(l->dest->statements
&& !strcmp (l->dest->statements->opcode, "<GOTO>"));
l = l->dest->statements->opa->o.label) {
}
if (l != label) {
if (!strcmp (s->opcode, "<GOTO>"))
s->opa->o.label = l;
else if (!strncmp (s->opcode, "<IF", 3))
s->opb->o.label = l;
if (l != *label) {
if (!--(*label)->used)
remove_label_from_dest (*label);
l->used++;
*label = l;
}
}
}