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1 709 jeremybenn
;; Operand and operator predicates for the GCC MMIX port.
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;; Copyright (C) 2005, 2007 Free Software Foundation, Inc.
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;; This file is part of GCC.
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;;
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;; GCC is free software; you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation; either version 3, or (at your option)
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;; any later version.
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;;
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;; GCC is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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;; GNU General Public License for more details.
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;;
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;; You should have received a copy of the GNU General Public License
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;; along with GCC; see the file COPYING3.  If not see
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;; .
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;; Return 1 if OP is a valid comparison operator for "cbranch" instructions.
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;; LE and GE are further lowered by the cbranchdf4 pattern.
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(define_predicate "float_comparison_operator"
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  (match_code "ne, eq, le, ge, lt, gt, ordered, unordered"))
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;; True if this is a foldable comparison operator
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;; - one where a the result of (compare:CC (reg) (const_int 0)) can be
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;; replaced by (reg).  */
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(define_predicate "mmix_foldable_comparison_operator"
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  (match_code "ne, eq, ge, gt, le, lt, gtu, leu")
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{
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  RTX_CODE code = GET_CODE (op);
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  if (mode == VOIDmode)
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    mode = GET_MODE (op);
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  /* This little bit is why the body of this predicate is kept as C.  */
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  if (mode == VOIDmode)
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    mode = GET_MODE (XEXP (op, 0));
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  return ((mode == CCmode || mode == DImode)
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          && (code == NE || code == EQ || code == GE || code == GT
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              || code == LE || code == LT))
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    /* FIXME: This may be a stupid trick.  What happens when GCC wants to
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       reverse the condition?  Can it do that by itself?  Maybe it can
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       even reverse the condition to fit a foldable one in the first
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       place?  */
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    || (mode == CC_UNSmode && (code == GTU || code == LEU));
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})
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;; Like comparison_operator, but only true if this comparison operator is
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;; applied to a valid mode.  Needed to avoid jump.c generating invalid
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;; code with -ffast-math (gcc.dg/20001228-1.c).
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(define_predicate "mmix_comparison_operator"
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  (match_operand 0 "comparison_operator")
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{
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  RTX_CODE code = GET_CODE (op);
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  /* Comparison operators usually don't have a mode, but let's try and get
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     one anyway for the day that changes.  */
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  if (mode == VOIDmode)
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    mode = GET_MODE (op);
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  /* Get the mode from the first operand if we don't have one.
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     Also the reason why we do this in C.  */
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  if (mode == VOIDmode)
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    mode = GET_MODE (XEXP (op, 0));
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  /* FIXME: This needs to be kept in sync with the tables in
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     mmix_output_condition.  */
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  return
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    mode == VOIDmode
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    || (mode == CC_FUNmode
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        && (code == ORDERED || code == UNORDERED))
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    || (mode == CC_FPmode
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        && (code == GT || code == LT))
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    || (mode == CC_FPEQmode
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        && (code == NE || code == EQ))
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    || (mode == CC_UNSmode
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        && (code == GEU || code == GTU || code == LEU || code == LTU))
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    || (mode == CCmode
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        && (code == NE || code == EQ || code == GE || code == GT
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            || code == LE || code == LT))
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    || (mode == DImode
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        && (code == NE || code == EQ || code == GE || code == GT
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            || code == LE || code == LT || code == LEU || code == GTU));
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})
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;; True if this is a register with a condition-code mode.
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(define_predicate "mmix_reg_cc_operand"
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  (and (match_operand 0 "register_operand")
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       (ior (match_test "GET_MODE (op) == CCmode")
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            (ior (match_test "GET_MODE (op) == CC_UNSmode")
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                 (ior (match_test "GET_MODE (op) == CC_FPmode")
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                      (ior (match_test "GET_MODE (op) == CC_FPEQmode")
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                           (match_test "GET_MODE (op) == CC_FUNmode")))))))
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;; True if this is an address_operand or a symbolic operand.
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(define_predicate "mmix_symbolic_or_address_operand"
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  (match_code "symbol_ref, label_ref, const, subreg, reg, plus")
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{
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  switch (GET_CODE (op))
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    {
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    case SYMBOL_REF:
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    case LABEL_REF:
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      return 1;
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    case CONST:
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      /* The reason why this body still is C.  */
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      op = XEXP (op, 0);
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      if ((GET_CODE (XEXP (op, 0)) == SYMBOL_REF
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           || GET_CODE (XEXP (op, 0)) == LABEL_REF)
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          && (GET_CODE (XEXP (op, 1)) == CONST_INT
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              || (GET_CODE (XEXP (op, 1)) == CONST_DOUBLE
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                  && GET_MODE (XEXP (op, 1)) == VOIDmode)))
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        return 1;
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      /* Fall through.  */
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    default:
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      return address_operand (op, mode);
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    }
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})
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;; True if this is a register or CONST_INT (or CONST_DOUBLE for DImode).
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;; We could narrow the value down with a couple of predicates, but that
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;; doesn't seem to be worth it at the moment.
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(define_predicate "mmix_reg_or_constant_operand"
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  (ior (match_operand 0 "register_operand")
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       (ior (match_code "const_int")
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            (and (match_code "const_double")
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                 (match_test "GET_MODE (op) == VOIDmode")))))
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;; True if this is a register or 0 (int or float).
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(define_predicate "mmix_reg_or_0_operand"
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  (ior
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   (match_operand 0 "register_operand")
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   (ior
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    (and (match_code "const_int")
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         (match_test "op == const0_rtx"))
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    (and
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     (match_code "const_double")
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     ;; FIXME: Is mode calculation necessary and correct?
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     (match_test
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      "op == CONST0_RTX (mode == VOIDmode ? GET_MODE (op) : mode)")))))
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;; True if this is a register or an int 0..255.
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(define_predicate "mmix_reg_or_8bit_operand"
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  (ior
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   (match_operand 0 "register_operand")
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   (and (match_code "const_int")
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        (match_test "CONST_OK_FOR_LETTER_P (INTVAL (op), 'I')"))))

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