struct block_dims *start_dims;
ir_node *start_block = get_irg_start_block(chordal_env->irg);
- env.arch_env = chordal_env->main_env->arch_env;
+ env.arch_env = chordal_env->birg->main_env->arch_env;
env.opts = opts;
env.block_dims = pmap_create();
env.plotter = plotter;