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* config/ia64/ia64.c (struct reg_write_state): Change into unsigned short bitfields rather than unsigned int, decrease first_pred to just 10 bits. (rws_insn): Change into a bitmap or if not ENABLE_CHECKING into two char array. (rws_insn_set, rws_insn_test): New functions. (in_safe_group_barrier): New variable. (rws_update): Remove first argument, always set rws_sum array. (rws_access_regno): Use rws_insn_set macro. Only call rws_update or update rws_sum if !in_safe_group_barrier, adjust rws_update args. (rtx_needs_barrier): Use rws_insn_test macro. (safe_group_barrier_needed): Don't save/restore rws_sum array, instead set/clear in_safe_group_barrier flag. From-SVN: r129861
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