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util/ra: Only update q_total if the reg is not assigned

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We only use q_total if the reg is not assigned so there's no point in
updating it if the reg is not assigned.  This has no known perf benefit
but it will reduce churn in a future commit.

Reviewed-by: Eric Anholt <eric@anholt.net>
This commit is contained in:
Jason Ekstrand 2019-05-09 17:05:31 -05:00
parent 9d6d1f47e7
commit e1511f1d4c
1 changed files with 1 additions and 1 deletions
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2
src/util/register_allocate.c
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@ -484,7 +484,7 @@ decrement_q(struct ra_graph *g, unsigned int n)
unsigned int n2 = g->nodes[n].adjacency_list[i];
unsigned int n2_class = g->nodes[n2].class;
if (!BITSET_TEST(g->in_stack, n2)) {
if (!BITSET_TEST(g->in_stack, n2) && g->nodes[n2].reg == NO_REG) {
assert(g->nodes[n2].q_total >= g->regs->classes[n2_class]->q[n_class]);
g->nodes[n2].q_total -= g->regs->classes[n2_class]->q[n_class];
}