bechordal: Remove the write-only bitset out_constr from pre_process_constraints().

diff --git a/ir/be/bechordal_common.c b/ir/be/bechordal_common.c
index 90145a9..9fd00bd 100644 (file)
--- a/ir/be/bechordal_common.c
+++ b/ir/be/bechordal_common.c
@@ -207,30 +207,14 @@ void create_borders(ir_node *block, void *env_ptr)
 
 ir_node *pre_process_constraints(be_chordal_env_t *env, be_insn_t **the_insn)
 {
-       be_insn_t *insn       = *the_insn;
-       ir_node   *perm       = NULL;
-       bitset_t  *out_constr = bitset_alloca(env->cls->n_regs);
-       int        i;
-
+       be_insn_t *insn = *the_insn;
        assert(insn->has_constraints && "only do this for constrained nodes");
 
-       /*
-        * Collect all registers that occur in output constraints.
-        * This is necessary, since if the insn has one of these as an input constraint
-        * and the corresponding operand interferes with the insn, the operand must
-        * be copied.
-        */
-       for (i = 0; i < insn->use_start; ++i) {
-               be_operand_t *op = &insn->ops[i];
-               if (op->has_constraints)
-                       bitset_or(out_constr, op->regs);
-       }
-
        /*
         * Make the Perm, recompute liveness and re-scan the insn since the
         * in operands are now the Projs of the Perm.
         */
-       perm = insert_Perm_before(env->irg, env->cls, insn->irn);
+       ir_node *const perm = insert_Perm_before(env->irg, env->cls, insn->irn);
 
        /* Registers are propagated by insert_Perm_before(). Clean them here! */
        if (perm == NULL)
@@ -254,7 +238,7 @@ ir_node *pre_process_constraints(be_chordal_env_t *env, be_insn_t **the_insn)
         * Copy the input constraints of the insn to the Perm as output
         * constraints. Succeeding phases (coalescing) will need that.
         */
-       for (i = insn->use_start; i < insn->n_ops; ++i) {
+       for (int i = insn->use_start; i < insn->n_ops; ++i) {
                be_operand_t *op = &insn->ops[i];
                ir_node *proj = op->carrier;
                /*