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Set def after setting use.

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An instruction that both reads and writes the same variable will read the
variable before writing to it, so the instruction uses the variable rather
than defines it (for live-variable purposes).
This commit is contained in:
Bill Currie 2012-11-06 18:29:09 +09:00
parent 58cb73d6aa
commit e3a49df0a8
1 changed files with 1 additions and 1 deletions
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2
tools/qfcc/source/flow.c
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@ -287,9 +287,9 @@ flow_live_vars (flowgraph_t *graph)
def = set_new ();
for (st = node->sblock->statements; st; st = st->next) {
find_operands (st, &d, &u[0], &u[1], &u[2]);
live_set_def (flow_get_var (d), use, def);
for (j = 0; j < 3; j++)
live_set_use (flow_get_var (u[j]), use, def);
live_set_def (flow_get_var (d), use, def);
}
node->live_vars.use = use;
node->live_vars.def = def;