beinsn: Avoid copying bitsets by using a raw bitset for the admissible registers.

[libfirm] / ir / be / beinsn.c

diff --git a/ir/be/beinsn.c b/ir/be/beinsn.c
index 78a9b6b..9afe833 100644 (file)
--- a/ir/be/beinsn.c
+++ b/ir/be/beinsn.c
@@ -106,13 +106,8 @@ be_insn_t *be_scan_insn(be_chordal_env_t const *const env, ir_node *const irn)
                arch_register_req_t const *const req = op->req;
                assert(req->cls == env->cls);
 
-               if (req->type & arch_register_req_type_limited) {
-                       bitset_t *regs = bitset_obstack_alloc(obst, env->cls->n_regs);
-                       rbitset_copy_to_bitset(req->limited, regs);
-                       op->regs = regs;
-               } else {
-                       op->regs = env->allocatable_regs;
-               }
+               op->regs = arch_register_req_is(req, limited) ?
+                       req->limited : env->allocatable_regs->data;
        }
 
        return insn;