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C++ build_polynomial_chrec函数代码示例

原作者: [db:作者] 来自: [db:来源] 收藏 邀请

本文整理汇总了C++中build_polynomial_chrec函数的典型用法代码示例。如果您正苦于以下问题：C++ build_polynomial_chrec函数的具体用法？C++ build_polynomial_chrec怎么用？C++ build_polynomial_chrec使用的例子？那么恭喜您, 这里精选的函数代码示例或许可以为您提供帮助。



在下文中一共展示了build_polynomial_chrec函数的17个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于我们的系统推荐出更棒的C++代码示例。

示例1: chrec_fold_multiply_poly_poly

static inline tree
chrec_fold_multiply_poly_poly (tree type,
			       tree poly0,
			       tree poly1)
{
  tree t0, t1, t2;
  int var;
  struct loop *loop0 = get_chrec_loop (poly0);
  struct loop *loop1 = get_chrec_loop (poly1);

  gcc_assert (poly0);
  gcc_assert (poly1);
  gcc_assert (TREE_CODE (poly0) == POLYNOMIAL_CHREC);
  gcc_assert (TREE_CODE (poly1) == POLYNOMIAL_CHREC);
  gcc_checking_assert (useless_type_conversion_p (type, chrec_type (poly0))
		       && useless_type_conversion_p (type, chrec_type (poly1)));

  /* {a, +, b}_1 * {c, +, d}_2  ->  {c*{a, +, b}_1, +, d}_2,
     {a, +, b}_2 * {c, +, d}_1  ->  {a*{c, +, d}_1, +, b}_2,
     {a, +, b}_x * {c, +, d}_x  ->  {a*c, +, a*d + b*c + b*d, +, 2*b*d}_x.  */
  if (flow_loop_nested_p (loop0, loop1))
    /* poly0 is a constant wrt. poly1.  */
    return build_polynomial_chrec
      (CHREC_VARIABLE (poly1),
       chrec_fold_multiply (type, CHREC_LEFT (poly1), poly0),
       CHREC_RIGHT (poly1));

  if (flow_loop_nested_p (loop1, loop0))
    /* poly1 is a constant wrt. poly0.  */
    return build_polynomial_chrec
      (CHREC_VARIABLE (poly0),
       chrec_fold_multiply (type, CHREC_LEFT (poly0), poly1),
       CHREC_RIGHT (poly0));

  gcc_assert (loop0 == loop1);

  /* poly0 and poly1 are two polynomials in the same variable,
     {a, +, b}_x * {c, +, d}_x  ->  {a*c, +, a*d + b*c + b*d, +, 2*b*d}_x.  */

  /* "a*c".  */
  t0 = chrec_fold_multiply (type, CHREC_LEFT (poly0), CHREC_LEFT (poly1));

  /* "a*d + b*c".  */
  t1 = chrec_fold_multiply (type, CHREC_LEFT (poly0), CHREC_RIGHT (poly1));
  t1 = chrec_fold_plus (type, t1, chrec_fold_multiply (type,
						       CHREC_RIGHT (poly0),
						       CHREC_LEFT (poly1)));
  /* "b*d".  */
  t2 = chrec_fold_multiply (type, CHREC_RIGHT (poly0), CHREC_RIGHT (poly1));
  /* "a*d + b*c + b*d".  */
  t1 = chrec_fold_plus (type, t1, t2);
  /* "2*b*d".  */
  t2 = chrec_fold_multiply (type, SCALAR_FLOAT_TYPE_P (type)
			    ? build_real (type, dconst2)
			    : build_int_cst (type, 2), t2);

  var = CHREC_VARIABLE (poly0);
  return build_polynomial_chrec (var, t0,
				 build_polynomial_chrec (var, t1, t2));
}
开发者ID:hemantjain95，项目名称:gcc，代码行数:60，代码来源:tree-chrec.c


示例2: chrec_fold_poly_cst

static inline tree 
chrec_fold_poly_cst (enum tree_code code, 
		     tree type, 
		     tree poly, 
		     tree cst)
{
  gcc_assert (poly);
  gcc_assert (cst);
  gcc_assert (TREE_CODE (poly) == POLYNOMIAL_CHREC);
  gcc_assert (!is_not_constant_evolution (cst));
  
  switch (code)
    {
    case PLUS_EXPR:
      return build_polynomial_chrec 
	(CHREC_VARIABLE (poly), 
	 chrec_fold_plus (type, CHREC_LEFT (poly), cst),
	 CHREC_RIGHT (poly));
      
    case MINUS_EXPR:
      return build_polynomial_chrec 
	(CHREC_VARIABLE (poly), 
	 chrec_fold_minus (type, CHREC_LEFT (poly), cst),
	 CHREC_RIGHT (poly));
      
    case MULT_EXPR:
      return build_polynomial_chrec 
	(CHREC_VARIABLE (poly), 
	 chrec_fold_multiply (type, CHREC_LEFT (poly), cst),
	 chrec_fold_multiply (type, CHREC_RIGHT (poly), cst));
      
    default:
      return chrec_dont_know;
    }
}
开发者ID:DJHartley，项目名称:iphone-dev，代码行数:35，代码来源:tree-chrec.c


示例3: chrec_fold_multiply

tree
chrec_fold_multiply (tree type, 
		     tree op0,
		     tree op1)
{
  if (automatically_generated_chrec_p (op0)
      || automatically_generated_chrec_p (op1))
    return chrec_fold_automatically_generated_operands (op0, op1);
  
  switch (TREE_CODE (op0))
    {
    case POLYNOMIAL_CHREC:
      switch (TREE_CODE (op1))
	{
	case POLYNOMIAL_CHREC:
	  return chrec_fold_multiply_poly_poly (type, op0, op1);
	  
	default:
	  if (integer_onep (op1))
	    return op0;
	  if (integer_zerop (op1))
	    return build_int_cst (type, 0);
	  
	  return build_polynomial_chrec 
	    (CHREC_VARIABLE (op0), 
	     chrec_fold_multiply (type, CHREC_LEFT (op0), op1),
	     chrec_fold_multiply (type, CHREC_RIGHT (op0), op1));
	}
      
    default:
      if (integer_onep (op0))
	return op1;
      
      if (integer_zerop (op0))
    	return build_int_cst (type, 0);
      
      switch (TREE_CODE (op1))
	{
	case POLYNOMIAL_CHREC:
	  return build_polynomial_chrec 
	    (CHREC_VARIABLE (op1), 
	     chrec_fold_multiply (type, CHREC_LEFT (op1), op0),
	     chrec_fold_multiply (type, CHREC_RIGHT (op1), op0));
	  
	default:
	  if (integer_onep (op1))
	    return op0;
	  if (integer_zerop (op1))
	    return build_int_cst (type, 0);
	  return fold_build2 (MULT_EXPR, type, op0, op1);
	}
    }
}
开发者ID:AhmadTux，项目名称:DragonFlyBSD，代码行数:53，代码来源:tree-chrec.c


示例4: hide_evolution_in_other_loops_than_loop

tree
hide_evolution_in_other_loops_than_loop (tree chrec,
					 unsigned loop_num)
{
  struct loop *loop = get_loop (cfun, loop_num), *chloop;
  if (automatically_generated_chrec_p (chrec))
    return chrec;

  switch (TREE_CODE (chrec))
    {
    case POLYNOMIAL_CHREC:
      chloop = get_chrec_loop (chrec);

      if (chloop == loop)
	return build_polynomial_chrec
	  (loop_num,
	   hide_evolution_in_other_loops_than_loop (CHREC_LEFT (chrec),
						    loop_num),
	   CHREC_RIGHT (chrec));

      else if (flow_loop_nested_p (chloop, loop))
	/* There is no evolution in this loop.  */
	return initial_condition (chrec);

      else
	{
	  gcc_assert (flow_loop_nested_p (loop, chloop));
	  return hide_evolution_in_other_loops_than_loop (CHREC_LEFT (chrec),
							  loop_num);
	}

    default:
      return chrec;
    }
}
开发者ID:hemantjain95，项目名称:gcc，代码行数:35，代码来源:tree-chrec.c


示例5: reset_evolution_in_loop

tree
reset_evolution_in_loop (unsigned loop_num,
			 tree chrec,
			 tree new_evol)
{
  struct loop *loop = get_loop (cfun, loop_num);

  if (POINTER_TYPE_P (chrec_type (chrec)))
    gcc_assert (ptrofftype_p (chrec_type (new_evol)));
  else
    gcc_assert (chrec_type (chrec) == chrec_type (new_evol));

  if (TREE_CODE (chrec) == POLYNOMIAL_CHREC
      && flow_loop_nested_p (loop, get_chrec_loop (chrec)))
    {
      tree left = reset_evolution_in_loop (loop_num, CHREC_LEFT (chrec),
					   new_evol);
      tree right = reset_evolution_in_loop (loop_num, CHREC_RIGHT (chrec),
					    new_evol);
      return build3 (POLYNOMIAL_CHREC, TREE_TYPE (left),
		     CHREC_VAR (chrec), left, right);
    }

  while (TREE_CODE (chrec) == POLYNOMIAL_CHREC
	 && CHREC_VARIABLE (chrec) == loop_num)
    chrec = CHREC_LEFT (chrec);

  return build_polynomial_chrec (loop_num, chrec, new_evol);
}
开发者ID:hemantjain95，项目名称:gcc，代码行数:29，代码来源:tree-chrec.c


示例6: chrec_convert_aggressive

tree
chrec_convert_aggressive (tree type, tree chrec)
{
  tree inner_type, left, right, lc, rc, rtype;

  if (automatically_generated_chrec_p (chrec)
      || TREE_CODE (chrec) != POLYNOMIAL_CHREC)
    return NULL_TREE;

  inner_type = TREE_TYPE (chrec);
  if (TYPE_PRECISION (type) > TYPE_PRECISION (inner_type))
    return NULL_TREE;

  /* If we cannot perform arithmetic in TYPE, avoid creating an scev.  */
  if (avoid_arithmetics_in_type_p (type))
    return NULL_TREE;

  rtype = POINTER_TYPE_P (type) ? sizetype : type;

  left = CHREC_LEFT (chrec);
  right = CHREC_RIGHT (chrec);
  lc = chrec_convert_aggressive (type, left);
  if (!lc)
    lc = chrec_convert (type, left, NULL);
  rc = chrec_convert_aggressive (rtype, right);
  if (!rc)
    rc = chrec_convert (rtype, right, NULL);
 
  return build_polynomial_chrec (CHREC_VARIABLE (chrec), lc, rc);
}
开发者ID:AhmadTux，项目名称:DragonFlyBSD，代码行数:30，代码来源:tree-chrec.c


示例7: chrec_convert_aggressive

tree
chrec_convert_aggressive (tree type, tree chrec, bool *fold_conversions)
{
  tree inner_type, left, right, lc, rc, rtype;

  gcc_assert (fold_conversions != NULL);

  if (automatically_generated_chrec_p (chrec)
      || TREE_CODE (chrec) != POLYNOMIAL_CHREC)
    return NULL_TREE;

  inner_type = TREE_TYPE (chrec);
  if (TYPE_PRECISION (type) > TYPE_PRECISION (inner_type))
    return NULL_TREE;

  if (useless_type_conversion_p (type, inner_type))
    return NULL_TREE;

  if (!*fold_conversions && evolution_function_is_affine_p (chrec))
    {
      tree base, step;
      struct loop *loop;

      loop = get_chrec_loop (chrec);
      base = CHREC_LEFT (chrec);
      step = CHREC_RIGHT (chrec);
      if (convert_affine_scev (loop, type, &base, &step, NULL, true))
	return build_polynomial_chrec (loop->num, base, step);
    }
  rtype = POINTER_TYPE_P (type) ? sizetype : type;

  left = CHREC_LEFT (chrec);
  right = CHREC_RIGHT (chrec);
  lc = chrec_convert_aggressive (type, left, fold_conversions);
  if (!lc)
    lc = chrec_convert (type, left, NULL);
  rc = chrec_convert_aggressive (rtype, right, fold_conversions);
  if (!rc)
    rc = chrec_convert (rtype, right, NULL);

  *fold_conversions = true;

  return build_polynomial_chrec (CHREC_VARIABLE (chrec), lc, rc);
}
开发者ID:hemantjain95，项目名称:gcc，代码行数:44，代码来源:tree-chrec.c


示例8: chrec_component_in_loop_num

static tree
chrec_component_in_loop_num (tree chrec,
			     unsigned loop_num,
			     bool right)
{
  tree component;
  struct loop *loop = get_loop (cfun, loop_num), *chloop;

  if (automatically_generated_chrec_p (chrec))
    return chrec;

  switch (TREE_CODE (chrec))
    {
    case POLYNOMIAL_CHREC:
      chloop = get_chrec_loop (chrec);

      if (chloop == loop)
	{
	  if (right)
	    component = CHREC_RIGHT (chrec);
	  else
	    component = CHREC_LEFT (chrec);

	  if (TREE_CODE (CHREC_LEFT (chrec)) != POLYNOMIAL_CHREC
	      || CHREC_VARIABLE (CHREC_LEFT (chrec)) != CHREC_VARIABLE (chrec))
	    return component;

	  else
	    return build_polynomial_chrec
	      (loop_num,
	       chrec_component_in_loop_num (CHREC_LEFT (chrec),
					    loop_num,
					    right),
	       component);
	}

      else if (flow_loop_nested_p (chloop, loop))
	/* There is no evolution part in this loop.  */
	return NULL_TREE;

      else
	{
	  gcc_assert (flow_loop_nested_p (loop, chloop));
	  return chrec_component_in_loop_num (CHREC_LEFT (chrec),
					      loop_num,
					      right);
	}

     default:
      if (right)
	return NULL_TREE;
      else
	return chrec;
    }
}
开发者ID:hemantjain95，项目名称:gcc，代码行数:55，代码来源:tree-chrec.c


示例9: chrec_convert

tree 
chrec_convert (tree type, 
	       tree chrec)
{
  tree ct;
  
  if (automatically_generated_chrec_p (chrec))
    return chrec;
  
  ct = chrec_type (chrec);
  if (ct == type)
    return chrec;

  if (TYPE_PRECISION (ct) < TYPE_PRECISION (type))
    return count_ev_in_wider_type (type, chrec);

  switch (TREE_CODE (chrec))
    {
    case POLYNOMIAL_CHREC:
      return build_polynomial_chrec (CHREC_VARIABLE (chrec),
				     chrec_convert (type,
						    CHREC_LEFT (chrec)),
				     chrec_convert (type,
						    CHREC_RIGHT (chrec)));

    default:
      {
	tree res = fold_convert (type, chrec);

	/* Don't propagate overflows.  */
	TREE_OVERFLOW (res) = 0;
	if (CONSTANT_CLASS_P (res))
	  TREE_CONSTANT_OVERFLOW (res) = 0;

	/* But reject constants that don't fit in their type after conversion.
	   This can happen if TYPE_MIN_VALUE or TYPE_MAX_VALUE are not the
	   natural values associated with TYPE_PRECISION and TYPE_UNSIGNED,
	   and can cause problems later when computing niters of loops.  Note
	   that we don't do the check before converting because we don't want
	   to reject conversions of negative chrecs to unsigned types.  */
	if (TREE_CODE (res) == INTEGER_CST
	    && TREE_CODE (type) == INTEGER_TYPE
	    && !int_fits_type_p (res, type))
	  res = chrec_dont_know;

	return res;
      }
    }
}
开发者ID:DJHartley，项目名称:iphone-dev，代码行数:49，代码来源:tree-chrec.c


示例10: chrec_replace_initial_condition

tree 
chrec_replace_initial_condition (tree chrec, 
				 tree init_cond)
{
  if (automatically_generated_chrec_p (chrec))
    return chrec;
  
  switch (TREE_CODE (chrec))
    {
    case POLYNOMIAL_CHREC:
      return build_polynomial_chrec 
	(CHREC_VARIABLE (chrec),
	 chrec_replace_initial_condition (CHREC_LEFT (chrec), init_cond),
	 CHREC_RIGHT (chrec));
      
    default:
      return init_cond;
    }
}
开发者ID:DJHartley，项目名称:iphone-dev，代码行数:19，代码来源:tree-chrec.c


示例11: reset_evolution_in_loop

tree 
reset_evolution_in_loop (unsigned loop_num,
			 tree chrec, 
			 tree new_evol)
{
  if (TREE_CODE (chrec) == POLYNOMIAL_CHREC
      && CHREC_VARIABLE (chrec) > loop_num)
    return build2
      (TREE_CODE (chrec), 
       build_int_cst (NULL_TREE, CHREC_VARIABLE (chrec)), 
       reset_evolution_in_loop (loop_num, CHREC_LEFT (chrec), new_evol), 
       reset_evolution_in_loop (loop_num, CHREC_RIGHT (chrec), new_evol));
  
  while (TREE_CODE (chrec) == POLYNOMIAL_CHREC
	 && CHREC_VARIABLE (chrec) == loop_num)
    chrec = CHREC_LEFT (chrec);
  
  return build_polynomial_chrec (loop_num, chrec, new_evol);
}
开发者ID:DJHartley，项目名称:iphone-dev，代码行数:19，代码来源:tree-chrec.c


示例12: chrec_fold_plus_poly_poly

static inline tree
chrec_fold_plus_poly_poly (enum tree_code code,
			   tree type,
			   tree poly0,
			   tree poly1)
{
  tree left, right;
  struct loop *loop0 = get_chrec_loop (poly0);
  struct loop *loop1 = get_chrec_loop (poly1);
  tree rtype = code == POINTER_PLUS_EXPR ? chrec_type (poly1) : type;

  gcc_assert (poly0);
  gcc_assert (poly1);
  gcc_assert (TREE_CODE (poly0) == POLYNOMIAL_CHREC);
  gcc_assert (TREE_CODE (poly1) == POLYNOMIAL_CHREC);
  if (POINTER_TYPE_P (chrec_type (poly0)))
    gcc_checking_assert (ptrofftype_p (chrec_type (poly1))
			 && useless_type_conversion_p (type, chrec_type (poly0)));
  else
    gcc_checking_assert (useless_type_conversion_p (type, chrec_type (poly0))
			 && useless_type_conversion_p (type, chrec_type (poly1)));

  /*
    {a, +, b}_1 + {c, +, d}_2  ->  {{a, +, b}_1 + c, +, d}_2,
    {a, +, b}_2 + {c, +, d}_1  ->  {{c, +, d}_1 + a, +, b}_2,
    {a, +, b}_x + {c, +, d}_x  ->  {a+c, +, b+d}_x.  */
  if (flow_loop_nested_p (loop0, loop1))
    {
      if (code == PLUS_EXPR || code == POINTER_PLUS_EXPR)
	return build_polynomial_chrec
	  (CHREC_VARIABLE (poly1),
	   chrec_fold_plus (type, poly0, CHREC_LEFT (poly1)),
	   CHREC_RIGHT (poly1));
      else
	return build_polynomial_chrec
	  (CHREC_VARIABLE (poly1),
	   chrec_fold_minus (type, poly0, CHREC_LEFT (poly1)),
	   chrec_fold_multiply (type, CHREC_RIGHT (poly1),
				SCALAR_FLOAT_TYPE_P (type)
				? build_real (type, dconstm1)
				: build_int_cst_type (type, -1)));
    }

  if (flow_loop_nested_p (loop1, loop0))
    {
      if (code == PLUS_EXPR || code == POINTER_PLUS_EXPR)
	return build_polynomial_chrec
	  (CHREC_VARIABLE (poly0),
	   chrec_fold_plus (type, CHREC_LEFT (poly0), poly1),
	   CHREC_RIGHT (poly0));
      else
	return build_polynomial_chrec
	  (CHREC_VARIABLE (poly0),
	   chrec_fold_minus (type, CHREC_LEFT (poly0), poly1),
	   CHREC_RIGHT (poly0));
    }

  /* This function should never be called for chrecs of loops that
     do not belong to the same loop nest.  */
  gcc_assert (loop0 == loop1);

  if (code == PLUS_EXPR || code == POINTER_PLUS_EXPR)
    {
      left = chrec_fold_plus
	(type, CHREC_LEFT (poly0), CHREC_LEFT (poly1));
      right = chrec_fold_plus
	(rtype, CHREC_RIGHT (poly0), CHREC_RIGHT (poly1));
    }
  else
    {
      left = chrec_fold_minus
	(type, CHREC_LEFT (poly0), CHREC_LEFT (poly1));
      right = chrec_fold_minus
	(type, CHREC_RIGHT (poly0), CHREC_RIGHT (poly1));
    }

  if (chrec_zerop (right))
    return left;
  else
    return build_polynomial_chrec
      (CHREC_VARIABLE (poly0), left, right);
}
开发者ID:hemantjain95，项目名称:gcc，代码行数:82，代码来源:tree-chrec.c


示例13: chrec_apply

tree
chrec_apply (unsigned var,
	     tree chrec,
	     tree x)
{
  tree type = chrec_type (chrec);
  tree res = chrec_dont_know;

  if (automatically_generated_chrec_p (chrec)
      || automatically_generated_chrec_p (x)

      /* When the symbols are defined in an outer loop, it is possible
	 to symbolically compute the apply, since the symbols are
	 constants with respect to the varying loop.  */
      || chrec_contains_symbols_defined_in_loop (chrec, var))
    return chrec_dont_know;

  if (dump_file && (dump_flags & TDF_SCEV))
    fprintf (dump_file, "(chrec_apply \n");

  if (TREE_CODE (x) == INTEGER_CST && SCALAR_FLOAT_TYPE_P (type))
    x = build_real_from_int_cst (type, x);

  switch (TREE_CODE (chrec))
    {
    case POLYNOMIAL_CHREC:
      if (evolution_function_is_affine_p (chrec))
	{
	  if (CHREC_VARIABLE (chrec) != var)
	    return build_polynomial_chrec
	      (CHREC_VARIABLE (chrec),
	       chrec_apply (var, CHREC_LEFT (chrec), x),
	       chrec_apply (var, CHREC_RIGHT (chrec), x));

	  /* "{a, +, b} (x)"  ->  "a + b*x".  */
	  x = chrec_convert_rhs (type, x, NULL);
	  res = chrec_fold_multiply (TREE_TYPE (x), CHREC_RIGHT (chrec), x);
	  res = chrec_fold_plus (type, CHREC_LEFT (chrec), res);
	}
      else if (TREE_CODE (x) == INTEGER_CST
	       && tree_int_cst_sgn (x) == 1)
	/* testsuite/.../ssa-chrec-38.c.  */
	res = chrec_evaluate (var, chrec, x, 0);
      else
	res = chrec_dont_know;
      break;

    CASE_CONVERT:
      res = chrec_convert (TREE_TYPE (chrec),
			   chrec_apply (var, TREE_OPERAND (chrec, 0), x),
			   NULL);
      break;

    default:
      res = chrec;
      break;
    }

  if (dump_file && (dump_flags & TDF_SCEV))
    {
      fprintf (dump_file, "  (varying_loop = %d\n", var);
      fprintf (dump_file, ")\n  (chrec = ");
      print_generic_expr (dump_file, chrec, 0);
      fprintf (dump_file, ")\n  (x = ");
      print_generic_expr (dump_file, x, 0);
      fprintf (dump_file, ")\n  (res = ");
      print_generic_expr (dump_file, res, 0);
      fprintf (dump_file, "))\n");
    }

  return res;
}
开发者ID:hemantjain95，项目名称:gcc，代码行数:72，代码来源:tree-chrec.c


示例14: chrec_fold_multiply

tree
chrec_fold_multiply (tree type,
		     tree op0,
		     tree op1)
{
  if (automatically_generated_chrec_p (op0)
      || automatically_generated_chrec_p (op1))
    return chrec_fold_automatically_generated_operands (op0, op1);

  switch (TREE_CODE (op0))
    {
    case POLYNOMIAL_CHREC:
      gcc_checking_assert
	(!chrec_contains_symbols_defined_in_loop (op0, CHREC_VARIABLE (op0)));
      switch (TREE_CODE (op1))
	{
	case POLYNOMIAL_CHREC:
	  gcc_checking_assert
	    (!chrec_contains_symbols_defined_in_loop (op1,
						      CHREC_VARIABLE (op1)));
	  return chrec_fold_multiply_poly_poly (type, op0, op1);

	CASE_CONVERT:
	  if (tree_contains_chrecs (op1, NULL))
	    return chrec_dont_know;

	default:
	  if (integer_onep (op1))
	    return op0;
	  if (integer_zerop (op1))
	    return build_int_cst (type, 0);

	  return build_polynomial_chrec
	    (CHREC_VARIABLE (op0),
	     chrec_fold_multiply (type, CHREC_LEFT (op0), op1),
	     chrec_fold_multiply (type, CHREC_RIGHT (op0), op1));
	}

    CASE_CONVERT:
      if (tree_contains_chrecs (op0, NULL))
	return chrec_dont_know;

    default:
      if (integer_onep (op0))
	return op1;

      if (integer_zerop (op0))
    	return build_int_cst (type, 0);

      switch (TREE_CODE (op1))
	{
	case POLYNOMIAL_CHREC:
	  gcc_checking_assert
	    (!chrec_contains_symbols_defined_in_loop (op1,
						      CHREC_VARIABLE (op1)));
	  return build_polynomial_chrec
	    (CHREC_VARIABLE (op1),
	     chrec_fold_multiply (type, CHREC_LEFT (op1), op0),
	     chrec_fold_multiply (type, CHREC_RIGHT (op1), op0));

	CASE_CONVERT:
	  if (tree_contains_chrecs (op1, NULL))
	    return chrec_dont_know;

	default:
	  if (integer_onep (op1))
	    return op0;
	  if (integer_zerop (op1))
	    return build_int_cst (type, 0);
	  return fold_build2 (MULT_EXPR, type, op0, op1);
	}
    }
}
开发者ID:hemantjain95，项目名称:gcc，代码行数:73，代码来源:tree-chrec.c


示例15: chrec_fold_plus_1

static tree
chrec_fold_plus_1 (enum tree_code code, tree type,
		   tree op0, tree op1)
{
  if (automatically_generated_chrec_p (op0)
      || automatically_generated_chrec_p (op1))
    return chrec_fold_automatically_generated_operands (op0, op1);

  switch (TREE_CODE (op0))
    {
    case POLYNOMIAL_CHREC:
      gcc_checking_assert
	(!chrec_contains_symbols_defined_in_loop (op0, CHREC_VARIABLE (op0)));
      switch (TREE_CODE (op1))
	{
	case POLYNOMIAL_CHREC:
	  gcc_checking_assert
	    (!chrec_contains_symbols_defined_in_loop (op1,
						      CHREC_VARIABLE (op1)));
	  return chrec_fold_plus_poly_poly (code, type, op0, op1);

	CASE_CONVERT:
	  if (tree_contains_chrecs (op1, NULL))
	    return chrec_dont_know;

	default:
	  if (code == PLUS_EXPR || code == POINTER_PLUS_EXPR)
	    return build_polynomial_chrec
	      (CHREC_VARIABLE (op0),
	       chrec_fold_plus (type, CHREC_LEFT (op0), op1),
	       CHREC_RIGHT (op0));
	  else
	    return build_polynomial_chrec
	      (CHREC_VARIABLE (op0),
	       chrec_fold_minus (type, CHREC_LEFT (op0), op1),
	       CHREC_RIGHT (op0));
	}

    CASE_CONVERT:
      if (tree_contains_chrecs (op0, NULL))
	return chrec_dont_know;

    default:
      switch (TREE_CODE (op1))
	{
	case POLYNOMIAL_CHREC:
	  gcc_checking_assert
	    (!chrec_contains_symbols_defined_in_loop (op1,
						      CHREC_VARIABLE (op1)));
	  if (code == PLUS_EXPR || code == POINTER_PLUS_EXPR)
	    return build_polynomial_chrec
	      (CHREC_VARIABLE (op1),
	       chrec_fold_plus (type, op0, CHREC_LEFT (op1)),
	       CHREC_RIGHT (op1));
	  else
	    return build_polynomial_chrec
	      (CHREC_VARIABLE (op1),
	       chrec_fold_minus (type, op0, CHREC_LEFT (op1)),
	       chrec_fold_multiply (type, CHREC_RIGHT (op1),
				    SCALAR_FLOAT_TYPE_P (type)
				    ? build_real (type, dconstm1)
				    : build_int_cst_type (type, -1)));

	CASE_CONVERT:
	  if (tree_contains_chrecs (op1, NULL))
	    return chrec_dont_know;

	default:
	  {
	    int size = 0;
	    if ((tree_contains_chrecs (op0, &size)
		 || tree_contains_chrecs (op1, &size))
		&& size < PARAM_VALUE (PARAM_SCEV_MAX_EXPR_SIZE))
	      return build2 (code, type, op0, op1);
	    else if (size < PARAM_VALUE (PARAM_SCEV_MAX_EXPR_SIZE))
	      {
		if (code == POINTER_PLUS_EXPR)
		  return fold_build_pointer_plus (fold_convert (type, op0),
						  op1);
		else
		  return fold_build2 (code, type,
				      fold_convert (type, op0),
				      fold_convert (type, op1));
	      }
	    else
	      return chrec_dont_know;
	  }
	}
    }
}
开发者ID:hemantjain95，项目名称:gcc，代码行数:90，代码来源:tree-chrec.c


示例16: chrec_fold_plus_1

static tree
chrec_fold_plus_1 (enum tree_code code, 
		   tree type, 
		   tree op0,
		   tree op1)
{
  if (automatically_generated_chrec_p (op0)
      || automatically_generated_chrec_p (op1))
    return chrec_fold_automatically_generated_operands (op0, op1);
  
  switch (TREE_CODE (op0))
    {
    case POLYNOMIAL_CHREC:
      switch (TREE_CODE (op1))
	{
	case POLYNOMIAL_CHREC:
	  return chrec_fold_plus_poly_poly (code, type, op0, op1);

	default:
	  if (code == PLUS_EXPR)
	    return build_polynomial_chrec 
	      (CHREC_VARIABLE (op0), 
	       chrec_fold_plus (type, CHREC_LEFT (op0), op1),
	       CHREC_RIGHT (op0));
	  else
	    return build_polynomial_chrec 
	      (CHREC_VARIABLE (op0), 
	       chrec_fold_minus (type, CHREC_LEFT (op0), op1),
	       CHREC_RIGHT (op0));
	}

    default:
      switch (TREE_CODE (op1))
	{
	case POLYNOMIAL_CHREC:
	  if (code == PLUS_EXPR)
	    return build_polynomial_chrec 
	      (CHREC_VARIABLE (op1), 
	       chrec_fold_plus (type, op0, CHREC_LEFT (op1)),
	       CHREC_RIGHT (op1));
	  else
	    return build_polynomial_chrec 
	      (CHREC_VARIABLE (op1), 
	       chrec_fold_minus (type, op0, CHREC_LEFT (op1)),
	       chrec_fold_multiply (type, CHREC_RIGHT (op1),
				    build_int_cst_type (type, -1)));

	default:
	  {
	    int size = 0;
	    if ((tree_contains_chrecs (op0, &size)
		 || tree_contains_chrecs (op1, &size))
		&& size < PARAM_VALUE (PARAM_SCEV_MAX_EXPR_SIZE))
	      return build2 (code, type, op0, op1);
	    else if (size < PARAM_VALUE (PARAM_SCEV_MAX_EXPR_SIZE))
	      return fold (build2 (code, type, op0, op1));
	    else
	      return chrec_dont_know;
	  }
	}
    }
}
开发者ID:DJHartley，项目名称:iphone-dev，代码行数:62，代码来源:tree-chrec.c


示例17: chrec_convert_1

static tree
chrec_convert_1 (tree type, tree chrec, gimple *at_stmt,
		 bool use_overflow_semantics)
{
  tree ct, res;
  tree base, step;
  struct loop *loop;

  if (automatically_generated_chrec_p (chrec))
    return chrec;

  ct = chrec_type (chrec);
  if (useless_type_conversion_p (type, ct))
    return chrec;

  if (!evolution_function_is_affine_p (chrec))
    goto keep_cast;

  loop = get_chrec_loop (chrec);
  base = CHREC_LEFT (chrec);
  step = CHREC_RIGHT (chrec);

  if (convert_affine_scev (loop, type, &base, &step, at_stmt,
			   use_overflow_semantics))
    return build_polynomial_chrec (loop->num, base, step);

  /* If we cannot propagate the cast inside the chrec, just keep the cast.  */
keep_cast:
  /* Fold will not canonicalize (long)(i - 1) to (long)i - 1 because that
     may be more expensive.  We do want to perform this optimization here
     though for canonicalization reasons.  */
  if (use_overflow_semantics
      && (TREE_CODE (chrec) == PLUS_EXPR
	  || TREE_CODE (chrec) == MINUS_EXPR)
      && TREE_CODE (type) == INTEGER_TYPE
      && TREE_CODE (ct) == INTEGER_TYPE
      && TYPE_PRECISION (type) > TYPE_PRECISION (ct)
      && TYPE_OVERFLOW_UNDEFINED (ct))
    res = fold_build2 (TREE_CODE (chrec), type,
		       fold_convert (type, TREE_OPERAND (chrec, 0)),
		       fold_convert (type, TREE_OPERAND (chrec, 1)));
  /* Similar perform the trick that (signed char)((int)x + 2) can be
     narrowed to (signed char)((unsigned char)x + 2).  */
  else if (use_overflow_semantics
	   && TREE_CODE (chrec) == POLYNOMIAL_CHREC
	   && TREE_CODE (ct) == INTEGER_TYPE
	   && TREE_CODE (type) == INTEGER_TYPE
	   && TYPE_OVERFLOW_UNDEFINED (type)
	   && TYPE_PRECISION (type) < TYPE_PRECISION (ct))
    {
      tree utype = unsigned_type_for (type);
      res = build_polynomial_chrec (CHREC_VARIABLE (chrec),
				    fold_convert (utype,
						  CHREC_LEFT (chrec)),
				    fold_convert (utype,
						  CHREC_RIGHT (chrec)));
      res = chrec_convert_1 (type, res, at_stmt, use_overflow_semantics);
    }
  else
    res = fold_convert (type, chrec);

  /* Don't propagate overflows.  */
  if (CONSTANT_CLASS_P (res))
    TREE_OVERFLOW (res) = 0;

  /* But reject constants that don't fit in their type after conversion.
     This can happen if TYPE_MIN_VALUE or TYPE_MAX_VALUE are not the
     natural values associated with TYPE_PRECISION and TYPE_UNSIGNED,
     and can cause problems later when computing niters of loops.  Note
     that we don't do the check before converting because we don't want
     to reject conversions of negative chrecs to unsigned types.  */
  if (TREE_CODE (res) == INTEGER_CST
      && TREE_CODE (type) == INTEGER_TYPE
      && !int_fits_type_p (res, type))
    res = chrec_dont_know;

  return res;
}
开发者ID:hemantjain95，项目名称:gcc，代码行数:78，代码来源:tree-chrec.c



注：本文中的build_polynomial_chrec函数示例由纯净天空整理自Github/MSDocs等源码及文档管理平台，相关代码片段筛选自各路编程大神贡献的开源项目，源码版权归原作者所有，传播和使用请参考对应项目的License；未经允许，请勿转载。

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