predicates.md

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;; Predicate definitions for HP PA-RISC.
;; Copyright (C) 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, 51 Franklin Street, Fifth Floor,
;; Boston, MA 02110-1301, USA.

;; Return nonzero only if OP is a register of mode MODE, or
;; CONST0_RTX.

(define_predicate "reg_or_0_operand"
  (match_code "subreg,reg,const_int,const_double")
{
  return (op == CONST0_RTX (mode) || register_operand (op, mode));
})

;; Return nonzero if OP is suitable for use in a call to a named
;; function.
;;
;; For 2.5 try to eliminate either call_operand_address or
;; function_label_operand, they perform very similar functions.

(define_predicate "call_operand_address"
  (match_code "label_ref,symbol_ref,const_int,const_double,const,high")
{
  return (GET_MODE (op) == word_mode
	  && CONSTANT_P (op) && ! TARGET_PORTABLE_RUNTIME);
})

;; Return 1 iff OP is an indexed memory operand.

(define_predicate "indexed_memory_operand"
  (match_code "subreg,mem")
{
  if (GET_MODE (op) != mode)
    return 0;

  /* Before reload, a (SUBREG (MEM...)) forces reloading into a register.  */
  if (reload_completed && GET_CODE (op) == SUBREG)
    op = SUBREG_REG (op);

  if (GET_CODE (op) != MEM || symbolic_memory_operand (op, mode))
    return 0;

  op = XEXP (op, 0);

  return (memory_address_p (mode, op) && IS_INDEX_ADDR_P (op));
})

;; TODO: Add a comment.

(define_predicate "symbolic_operand"
  (match_code "symbol_ref,label_ref,const")
{
  switch (GET_CODE (op))
    {
    case SYMBOL_REF:
      return !SYMBOL_REF_TLS_MODEL (op);
    case LABEL_REF:
      return 1;
    case CONST:
      op = XEXP (op, 0);
      return (((GET_CODE (XEXP (op, 0)) == SYMBOL_REF
                && !SYMBOL_REF_TLS_MODEL (XEXP (op, 0)))
	       || GET_CODE (XEXP (op, 0)) == LABEL_REF)
	      && GET_CODE (XEXP (op, 1)) == CONST_INT);
    default:
      return 0;
    }
})

;; Return truth value of statement that OP is a symbolic memory
;; operand of mode MODE.

(define_predicate "symbolic_memory_operand"
  (match_code "subreg,mem")
{
  if (GET_CODE (op) == SUBREG)
    op = SUBREG_REG (op);
  if (GET_CODE (op) != MEM)
    return 0;
  op = XEXP (op, 0);
  return ((GET_CODE (op) == SYMBOL_REF && !SYMBOL_REF_TLS_MODEL (op))
  	 || GET_CODE (op) == CONST || GET_CODE (op) == HIGH 
	 || GET_CODE (op) == LABEL_REF);
})

;; Return true if OP is a symbolic operand for the TLS Global Dynamic model.
(define_predicate "tgd_symbolic_operand"
  (and (match_code "symbol_ref")
       (match_test "SYMBOL_REF_TLS_MODEL (op) == TLS_MODEL_GLOBAL_DYNAMIC")))

;; Return true if OP is a symbolic operand for the TLS Local Dynamic model.
(define_predicate "tld_symbolic_operand"
  (and (match_code "symbol_ref")
       (match_test "SYMBOL_REF_TLS_MODEL (op) == TLS_MODEL_LOCAL_DYNAMIC")))

;; Return true if OP is a symbolic operand for the TLS Initial Exec model.
(define_predicate "tie_symbolic_operand"
  (and (match_code "symbol_ref")
       (match_test "SYMBOL_REF_TLS_MODEL (op) == TLS_MODEL_INITIAL_EXEC")))

;; Return true if OP is a symbolic operand for the TLS Local Exec model.
(define_predicate "tle_symbolic_operand"
  (and (match_code "symbol_ref")
       (match_test "SYMBOL_REF_TLS_MODEL (op) == TLS_MODEL_LOCAL_EXEC")))


;; Return 1 if the operand is a register operand or a non-symbolic
;; memory operand after reload.  This predicate is used for branch
;; patterns that internally handle register reloading.  We need to
;; accept non-symbolic memory operands after reload to ensure that the
;; pattern is still valid if reload didn't find a hard register for
;; the operand.

(define_predicate "reg_before_reload_operand"
  (match_code "reg,mem")
{
  /* Don't accept a SUBREG since it will need a reload.  */
  if (GET_CODE (op) == SUBREG)
    return 0;

  if (register_operand (op, mode))
    return 1;

  if (reload_completed
      && memory_operand (op, mode)
      && !symbolic_memory_operand (op, mode))
    return 1;

  return 0;
})

;; Return 1 if the operand is either a register, zero, or a memory
;; operand that is not symbolic.

(define_predicate "reg_or_0_or_nonsymb_mem_operand"
  (match_code "subreg,reg,mem,const_int,const_double")
{
  if (register_operand (op, mode))
    return 1;

  if (op == CONST0_RTX (mode))
    return 1;

  if (GET_CODE (op) == SUBREG)
    op = SUBREG_REG (op);

  if (GET_CODE (op) != MEM)
    return 0;

  /* Until problems with management of the REG_POINTER flag are resolved,
     we need to delay creating move insns with unscaled indexed addresses
     until CSE is not expected.  */
  if (!TARGET_NO_SPACE_REGS
      && !cse_not_expected
      && GET_CODE (XEXP (op, 0)) == PLUS
      && REG_P (XEXP (XEXP (op, 0), 0))
      && REG_P (XEXP (XEXP (op, 0), 1)))
    return 0;

  return (!symbolic_memory_operand (op, mode)
	  && memory_address_p (mode, XEXP (op, 0)));
})

;; Accept anything that can be used as a destination operand for a
;; move instruction.  We don't accept indexed memory operands since
;; they are supported only for floating point stores.

(define_predicate "move_dest_operand"
  (match_code "subreg,reg,mem")
{
  if (register_operand (op, mode))
    return 1;

  if (GET_MODE (op) != mode)
    return 0;

  if (GET_CODE (op) == SUBREG)
    op = SUBREG_REG (op);

  if (GET_CODE (op) != MEM || symbolic_memory_operand (op, mode))
    return 0;

  op = XEXP (op, 0);

  return (memory_address_p (mode, op)
	  && !IS_INDEX_ADDR_P (op)
	  && !IS_LO_SUM_DLT_ADDR_P (op));
})

;; Accept anything that can be used as a source operand for a move
;; instruction.

(define_predicate "move_src_operand"
  (match_code "subreg,reg,const_int,mem")
{
  if (register_operand (op, mode))
    return 1;

  if (GET_CODE (op) == CONST_INT)
    return cint_ok_for_move (INTVAL (op));

  if (GET_MODE (op) != mode)
    return 0;

  if (GET_CODE (op) == SUBREG)
    op = SUBREG_REG (op);

  if (GET_CODE (op) != MEM)
    return 0;

  /* Until problems with management of the REG_POINTER flag are resolved,
     we need to delay creating move insns with unscaled indexed addresses
     until CSE is not expected.  */
  if (!TARGET_NO_SPACE_REGS
      && !cse_not_expected
      && GET_CODE (XEXP (op, 0)) == PLUS
      && REG_P (XEXP (XEXP (op, 0), 0))
      && REG_P (XEXP (XEXP (op, 0), 1)))
    return 0;

  return memory_address_p (mode, XEXP (op, 0));
})

;; Accept anything that can be used as the source operand for a
;; prefetch instruction with a cache-control completer.

(define_predicate "prefetch_cc_operand"
  (match_code "mem")
{
  if (GET_CODE (op) != MEM)
    return 0;

  op = XEXP (op, 0);

  /* We must reject virtual registers as we don't allow REG+D.  */
  if (op == virtual_incoming_args_rtx
      || op == virtual_stack_vars_rtx
      || op == virtual_stack_dynamic_rtx
      || op == virtual_outgoing_args_rtx
      || op == virtual_cfa_rtx)
    return 0;

  if (!REG_P (op) && !IS_INDEX_ADDR_P (op))
    return 0;

  /* Until problems with management of the REG_POINTER flag are resolved,
     we need to delay creating prefetch insns with unscaled indexed addresses
     until CSE is not expected.  */
  if (!TARGET_NO_SPACE_REGS
      && !cse_not_expected
      && GET_CODE (op) == PLUS
      && REG_P (XEXP (op, 0)))
    return 0;

  return memory_address_p (mode, op);
})

;; Accept anything that can be used as the source operand for a
;; prefetch instruction with no cache-control completer.

(define_predicate "prefetch_nocc_operand"
  (match_code "mem")
{
  if (GET_CODE (op) != MEM)
    return 0;

  op = XEXP (op, 0);

  /* Until problems with management of the REG_POINTER flag are resolved,
     we need to delay creating prefetch insns with unscaled indexed addresses
     until CSE is not expected.  */
  if (!TARGET_NO_SPACE_REGS
      && !cse_not_expected