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概要[]

実装[]

262 struct rtl_bb_info GTY(())
263 {
 264   /* The first and last insns of the block.  */
265   rtx head_;
266   rtx end_;
267 
 268   /* The registers that are live on entry to this block.  */
269   bitmap GTY ((skip (""))) global_live_at_start;
270 
 271   /* The registers that are live on exit from this block.  */
272   bitmap GTY ((skip (""))) global_live_at_end;
273 
 274   /* In CFGlayout mode points to insn notes/jumptables to be placed just before
 275      and after the block.   */
276   rtx header;
277   rtx footer;
278 
 279   /* This field is used by the bb-reorder and tracer passes.  */
280   int visited;
281 };


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