From: Christoph Mallon <christoph.mallon@gmx.de>
Date: Sat, 24 Nov 2012 17:37:38 +0000 (+0100)
Subject: heur4: Avoid unnecessary bitset operations when the node is not limited.
X-Git-Url: http://nsz.repo.hu/git/?a=commitdiff_plain;h=7105209a991d24ef0be91898e7fb36386c3a9b9b;p=libfirm

heur4: Avoid unnecessary bitset operations when the node is not limited.
---

diff --git a/ir/be/becopyheur4.c b/ir/be/becopyheur4.c
index 5e5015015..264be4def 100644
--- a/ir/be/becopyheur4.c
+++ b/ir/be/becopyheur4.c
@@ -173,13 +173,12 @@ static co_mst_irn_t *co_mst_irn_init(co_mst_env_t *env, const ir_node *irn)
 	req = arch_get_irn_register_req(irn);
 	if (arch_register_req_is(req, limited)) {
 		rbitset_copy_to_bitset(req->limited, res->adm_colors);
+		/* exclude global ignore registers as well */
+		bitset_and(res->adm_colors, env->allocatable_regs);
 	} else {
-		bitset_set_all(res->adm_colors);
+		bitset_copy(res->adm_colors, env->allocatable_regs);
 	}
 
-	/* exclude global ignore registers as well */
-	bitset_and(res->adm_colors, env->allocatable_regs);
-
 	/* compute the constraint factor */
 	res->constr_factor = (real_t) (1 + env->n_regs - bitset_popcount(res->adm_colors)) / env->n_regs;