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julius |
;; 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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;; 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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