predicates.md

Mac OS X 10.4.9 for x86 Source Code gcc 实现源代码

;; Predicate definitions for IA-64.
;; Copyright (C) 2004, 2005 Free Software Foundation, Inc.
;;
;; This file is part of GCC.
;;
;; GCC is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation; either version 2, or (at your option)
;; any later version.
;;
;; GCC is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;; GNU General Public License for more details.
;;
;; You should have received a copy of the GNU General Public License
;; along with GCC; see the file COPYING.  If not, write to
;; the Free Software Foundation, 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, USA.

;; True if OP is a valid operand for the MEM of a CALL insn.
(define_predicate "call_operand"
  (ior (match_code "symbol_ref")
       (match_operand 0 "register_operand")))

;; True if OP refers to any kind of symbol.
;; For roughly the same reasons that pmode_register_operand exists, this
;; predicate ignores its mode argument.
(define_special_predicate "symbolic_operand" 
   (match_code "symbol_ref,const,label_ref"))

;; True if OP is a SYMBOL_REF which refers to a function.
(define_predicate "function_operand"
  (and (match_code "symbol_ref")
       (match_test "SYMBOL_REF_FUNCTION_P (op)")))

;; True if OP refers to a symbol in the sdata section.
(define_predicate "sdata_symbolic_operand" 
  (match_code "symbol_ref,const")
{
  HOST_WIDE_INT offset = 0, size = 0;

  switch (GET_CODE (op))
    {
    case CONST:
      op = XEXP (op, 0);
      if (GET_CODE (op) != PLUS
	  || GET_CODE (XEXP (op, 0)) != SYMBOL_REF
	  || GET_CODE (XEXP (op, 1)) != CONST_INT)
	return false;
      offset = INTVAL (XEXP (op, 1));
      op = XEXP (op, 0);
      /* FALLTHRU */

    case SYMBOL_REF:
      if (CONSTANT_POOL_ADDRESS_P (op))
	{
	  size = GET_MODE_SIZE (get_pool_mode (op));
	  if (size > ia64_section_threshold)
	    return false;
	}
      else
	{
	  tree t;

	  if (!SYMBOL_REF_LOCAL_P (op) || !SYMBOL_REF_SMALL_P (op))
	    return false;

	  /* Note that in addition to DECLs, we can get various forms
	     of constants here.  */
	  t = SYMBOL_REF_DECL (op);
	  if (DECL_P (t))
	    t = DECL_SIZE_UNIT (t);
	  else
	    t = TYPE_SIZE_UNIT (TREE_TYPE (t));
	  if (t && host_integerp (t, 0))
	    {
	      size = tree_low_cst (t, 0);
	      if (size < 0)
		size = 0;
	    }
	}

      /* Deny the stupid user trick of addressing outside the object.  Such
	 things quickly result in GPREL22 relocation overflows.  Of course,
	 they're also highly undefined.  From a pure pedant's point of view
	 they deserve a slap on the wrist (such as provided by a relocation
	 overflow), but that just leads to bugzilla noise.  */
      return (offset >= 0 && offset <= size);

    default:
      abort ();
    }
})

;; True if OP refers to a symbol in the small address area.
(define_predicate "small_addr_symbolic_operand" 
  (match_code "symbol_ref,const")
{
  switch (GET_CODE (op))
    {
    case CONST:
      op = XEXP (op, 0);
      if (GET_CODE (op) != PLUS
	  || GET_CODE (XEXP (op, 0)) != SYMBOL_REF
	  || GET_CODE (XEXP (op, 1)) != CONST_INT)
	return false;
      op = XEXP (op, 0);
      /* FALLTHRU */

    case SYMBOL_REF:
      return SYMBOL_REF_SMALL_ADDR_P (op);

    default:
      gcc_unreachable ();
    }
})

;; True if OP refers to a symbol with which we may use any offset.
(define_predicate "any_offset_symbol_operand"
  (match_code "symbol_ref")
{
  if (TARGET_NO_PIC || TARGET_AUTO_PIC)
    return true;
  if (SYMBOL_REF_SMALL_ADDR_P (op))
    return true;
  if (SYMBOL_REF_FUNCTION_P (op))
    return false;
  if (sdata_symbolic_operand (op, mode))
    return true;
  return false;
})

;; True if OP refers to a symbol with which we may use 14-bit aligned offsets.
;; False if OP refers to a symbol with which we may not use any offset at any
;; time.
(define_predicate "aligned_offset_symbol_operand"
  (and (match_code "symbol_ref")
       (match_test "! SYMBOL_REF_FUNCTION_P (op)")))

;; True if OP refers to a symbol, and is appropriate for a GOT load.
(define_predicate "got_symbolic_operand" 
  (match_operand 0 "symbolic_operand" "")
{
  HOST_WIDE_INT addend = 0;

  switch (GET_CODE (op))
    {
    case LABEL_REF:
      return true;

    case CONST:
      /* Accept only (plus (symbol_ref) (const_int)).  */
      op = XEXP (op, 0);
      if (GET_CODE (op) != PLUS
	  || GET_CODE (XEXP (op, 0)) != SYMBOL_REF
          || GET_CODE (XEXP (op, 1)) != CONST_INT)
        return false;

      addend = INTVAL (XEXP (op, 1));
      op = XEXP (op, 0);
      /* FALLTHRU */

    case SYMBOL_REF:
      /* These symbols shouldn't be used with got loads.  */
      if (SYMBOL_REF_SMALL_ADDR_P (op))
	return false;
      if (SYMBOL_REF_TLS_MODEL (op) != 0)
	return false;

      if (any_offset_symbol_operand (op, mode))
	return true;

      /* The low 14 bits of the constant have been forced to zero
	 so that we do not use up so many GOT entries.  Prevent cse
	 from undoing this.  */
      if (aligned_offset_symbol_operand (op, mode))
	return (addend & 0x3fff) == 0;

      return addend == 0;

    default:
      gcc_unreachable ();
    }
})

;; Return true if OP is a valid thread local storage symbolic operand.
(define_predicate "tls_symbolic_operand"
  (match_code "symbol_ref,const")
{
  switch (GET_CODE (op))
    {
    case SYMBOL_REF:
      return SYMBOL_REF_TLS_MODEL (op) != 0;

    case CONST:
      op = XEXP (op, 0);
      if (GET_CODE (op) != PLUS
	  || GET_CODE (XEXP (op, 0)) != SYMBOL_REF
	  || GET_CODE (XEXP (op, 1)) != CONST_INT)
	return false;

      /* We only allow certain offsets for certain tls models.  */
      switch (SYMBOL_REF_TLS_MODEL (XEXP (op, 0)))
	{
	case TLS_MODEL_GLOBAL_DYNAMIC:
	case TLS_MODEL_LOCAL_DYNAMIC:
	  return false;

	case TLS_MODEL_INITIAL_EXEC:
	  return (INTVAL (XEXP (op, 1)) & 0x3fff) == 0;

	case TLS_MODEL_LOCAL_EXEC:
	  return true;

	default:
	  return false;
	}

    default:
      gcc_unreachable ();
    }
})

;; Return true if OP is a local-dynamic thread local storage symbolic operand.
(define_predicate "ld_tls_symbolic_operand"
  (and (match_code "symbol_ref")
       (match_test "SYMBOL_REF_TLS_MODEL (op) == TLS_MODEL_LOCAL_DYNAMIC")))

;; Return true if OP is an initial-exec thread local storage symbolic operand.
(define_predicate "ie_tls_symbolic_operand"
  (match_code "symbol_ref,const")
{
  switch (GET_CODE (op))
    {
    case CONST:
      op = XEXP (op, 0);
      if (GET_CODE (op) != PLUS
	  || GET_CODE (XEXP (op, 0)) != SYMBOL_REF
	  || GET_CODE (XEXP (op, 1)) != CONST_INT
	  || (INTVAL (XEXP (op, 1)) & 0x3fff) != 0)
	return false;
      op = XEXP (op, 0);
      /* FALLTHRU */

    case SYMBOL_REF:
      return SYMBOL_REF_TLS_MODEL (op) == TLS_MODEL_INITIAL_EXEC;

    default:
      gcc_unreachable ();
    }
})

;; Return true if OP is a local-exec thread local storage symbolic operand.
(define_predicate "le_tls_symbolic_operand"
  (match_code "symbol_ref,const")
{
  switch (GET_CODE (op))
    {
    case CONST:
      op = XEXP (op, 0);
      if (GET_CODE (op) != PLUS
          || GET_CODE (XEXP (op, 0)) != SYMBOL_REF
          || GET_CODE (XEXP (op, 1)) != CONST_INT)
        return false;
      op = XEXP (op, 0);
      /* FALLTHRU */

    case SYMBOL_REF:
      return SYMBOL_REF_TLS_MODEL (op) == TLS_MODEL_LOCAL_EXEC;

    default:
      gcc_unreachable ();
    }
})

;; Like nonimmediate_operand, but don't allow MEMs that try to use a
;; POST_MODIFY with a REG as displacement.
(define_predicate "destination_operand"
  (and (match_operand 0 "nonimmediate_operand")
       (match_test "GET_CODE (op) != MEM
		    || GET_CODE (XEXP (op, 0)) != POST_MODIFY
		    || GET_CODE (XEXP (XEXP (XEXP (op, 0), 1), 1)) != REG")))

;; Like memory_operand, but don't allow post-increments.
(define_predicate "not_postinc_memory_operand"
  (and (match_operand 0 "memory_operand")
       (match_test "GET_RTX_CLASS (GET_CODE (XEXP (op, 0))) != RTX_AUTOINC")))

;; True if OP is a general operand, with some restrictions on symbols.
(define_predicate "move_operand"
  (match_operand 0 "general_operand")
{
  switch (GET_CODE (op))
    {