参照元

説明

  • パス: gcc-8.3/gcc/tree.c?
  • FIXME: これは何?
    • 説明

引数

返り値

参考

実装

/* Vector types need to re-check the target flags each time we report
   the machine mode.  We need to do this because attribute target can
   change the result of vector_mode_supported_p and have_regs_of_mode
   on a per-function basis.  Thus the TYPE_MODE of a VECTOR_TYPE can
   change on a per-function basis.  */
/* ??? Possibly a better solution is to run through all the types
   referenced by a function and re-compute the TYPE_MODE once, rather
   than make the TYPE_MODE macro call a function.  */

machine_mode
vector_type_mode (const_tree t)
{
  machine_mode mode;

  gcc_assert (TREE_CODE (t) == VECTOR_TYPE);
  mode = t->type_common.mode;
  if (VECTOR_MODE_P (mode)
      && (!targetm.vector_mode_supported_p (mode)
	  || !have_regs_of_mode[mode]))
    {
      scalar_int_mode innermode;
    • gcc-8.3/gcc/VECTOR_MODE_P()?
    • gcc-8.3/gcc/scalar_int_mode?
      /* For integers, try mapping it to a same-sized scalar mode.  */
      if (is_int_mode (TREE_TYPE (t)->type_common.mode, &innermode))
	{
	  poly_int64 size = (TYPE_VECTOR_SUBPARTS (t)
			     * GET_MODE_BITSIZE (innermode));
	  scalar_int_mode mode;
	  if (int_mode_for_size (size, 0).exists (&mode)
	      && have_regs_of_mode[mode])
	    return mode;
	}
      return BLKmode;
    }

  return mode;
}

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Last-modified: 2019-07-09 (火) 00:13:37 (202d)