From: Jason Ekstrand <jason@jlekstrand.net>
Date: Thu, 9 May 2019 22:05:31 +0000 (-0500)
Subject: util/ra: Only update q_total if the reg is not assigned
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=e1511f1d4c3949b107fda284ea9117632b9ef61d;p=mesa.git

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

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>
---

diff --git a/src/util/register_allocate.c b/src/util/register_allocate.c
index 9493f578dba..0c62ad3865c 100644
--- a/src/util/register_allocate.c
+++ b/src/util/register_allocate.c
@@ -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];
       }