gcc-8.3/gcc/init_elim_table() の履歴(No.1)

• 履歴一覧
• 差分 を表示
• 現在との差分 を表示
• ソース を表示
• gcc-8.3/gcc/init_elim_table() へ行く。
  • 1 (2019-06-11 (火) 14:10:09)

参照元†

• gcc-8.3/gcc/eliminate_regs_1()
• gcc-8.3/gcc/reg_eliminate(global)

説明†

• パス: gcc-8.3/gcc/reload1.c

• FIXME: これは何？
  • 説明

引数†

• なし

返り値†

• なし

参考†

実装†

/* Initialize the table of registers to eliminate.
   Pre-condition: global flag frame_pointer_needed has been set before
   calling this function.  */

static void
init_elim_table (void)
{
  struct elim_table *ep;
  const struct elim_table_1 *ep1;

• • gcc-8.3/gcc/elim_table
  • gcc-8.3/gcc/elim_table_1

  if (!reg_eliminate)
    reg_eliminate = XCNEWVEC (struct elim_table, NUM_ELIMINABLE_REGS);

  num_eliminable = 0;

• • gcc-8.3/gcc/XCNEWVEC()

  for (ep = reg_eliminate, ep1 = reg_eliminate_1;
       ep < &reg_eliminate[NUM_ELIMINABLE_REGS]; ep++, ep1++)
    {
      ep->from = ep1->from;
      ep->to = ep1->to;
      ep->can_eliminate = ep->can_eliminate_previous
	= (targetm.can_eliminate (ep->from, ep->to)
	   && ! (ep->to == STACK_POINTER_REGNUM
		 && frame_pointer_needed
		 && (! SUPPORTS_STACK_ALIGNMENT
		     || ! stack_realign_fp)));
    }

• • gcc-8.3/gcc/reg_eliminate(global)
  • gcc-8.3/gcc/targetm(global)

  /* Count the number of eliminable registers and build the FROM and TO
     REG rtx's.  Note that code in gen_rtx_REG will cause, e.g.,
     gen_rtx_REG (Pmode, STACK_POINTER_REGNUM) to equal stack_pointer_rtx.
     We depend on this.  */
  for (ep = reg_eliminate; ep < &reg_eliminate[NUM_ELIMINABLE_REGS]; ep++)
    {
      num_eliminable += ep->can_eliminate;
      ep->from_rtx = gen_rtx_REG (Pmode, ep->from);
      ep->to_rtx = gen_rtx_REG (Pmode, ep->to);
    }
}

• • gcc-8.3/gcc/gen_rtx_REG()

コメント†