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;; Operand and operator predicates for the GCC MMIX port.
;; Copyright (C) 2005, 2007 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 3, 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 COPYING3. If not see
;; <http://www.gnu.org/licenses/>.
;; Return 1 if OP is a valid comparison operator for "cbranch" instructions.
;; LE and GE are further lowered by the cbranchdf4 pattern.
(define_predicate "float_comparison_operator"
(match_code "ne, eq, le, ge, lt, gt, ordered, unordered"))
;; True if this is a foldable comparison operator
;; - one where a the result of (compare:CC (reg) (const_int 0)) can be
;; replaced by (reg). */
(define_predicate "mmix_foldable_comparison_operator"
(match_code "ne, eq, ge, gt, le, lt, gtu, leu")
{
RTX_CODE code = GET_CODE (op);
if (mode == VOIDmode)
mode = GET_MODE (op);
/* This little bit is why the body of this predicate is kept as C. */
if (mode == VOIDmode)
mode = GET_MODE (XEXP (op, 0));
return ((mode == CCmode || mode == DImode)
&& (code == NE || code == EQ || code == GE || code == GT
|| code == LE || code == LT))
/* FIXME: This may be a stupid trick. What happens when GCC wants to
reverse the condition? Can it do that by itself? Maybe it can
even reverse the condition to fit a foldable one in the first
place? */
|| (mode == CC_UNSmode && (code == GTU || code == LEU));
})
;; Like comparison_operator, but only true if this comparison operator is
;; applied to a valid mode. Needed to avoid jump.c generating invalid
;; code with -ffast-math (gcc.dg/20001228-1.c).
(define_predicate "mmix_comparison_operator"
(match_operand 0 "comparison_operator")
{
RTX_CODE code = GET_CODE (op);
/* Comparison operators usually don't have a mode, but let's try and get
one anyway for the day that changes. */
if (mode == VOIDmode)
mode = GET_MODE (op);
/* Get the mode from the first operand if we don't have one.
Also the reason why we do this in C. */
if (mode == VOIDmode)
mode = GET_MODE (XEXP (op, 0));
/* FIXME: This needs to be kept in sync with the tables in
mmix_output_condition. */
return
mode == VOIDmode
|| (mode == CC_FUNmode
&& (code == ORDERED || code == UNORDERED))
|| (mode == CC_FPmode
&& (code == GT || code == LT))
|| (mode == CC_FPEQmode
&& (code == NE || code == EQ))
|| (mode == CC_UNSmode
&& (code == GEU || code == GTU || code == LEU || code == LTU))
|| (mode == CCmode
&& (code == NE || code == EQ || code == GE || code == GT
|| code == LE || code == LT))
|| (mode == DImode
&& (code == NE || code == EQ || code == GE || code == GT
|| code == LE || code == LT || code == LEU || code == GTU));
})
;; True if this is a register with a condition-code mode.
(define_predicate "mmix_reg_cc_operand"
(and (match_operand 0 "register_operand")
(ior (match_test "GET_MODE (op) == CCmode")
(ior (match_test "GET_MODE (op) == CC_UNSmode")
(ior (match_test "GET_MODE (op) == CC_FPmode")
(ior (match_test "GET_MODE (op) == CC_FPEQmode")
(match_test "GET_MODE (op) == CC_FUNmode")))))))
;; True if this is an address_operand or a symbolic operand.
(define_predicate "mmix_symbolic_or_address_operand"
(match_code "symbol_ref, label_ref, const, subreg, reg, plus")
{
switch (GET_CODE (op))
{
case SYMBOL_REF:
case LABEL_REF:
return 1;
case CONST:
/* The reason why this body still is C. */
op = XEXP (op, 0);
if ((GET_CODE (XEXP (op, 0)) == SYMBOL_REF
|| GET_CODE (XEXP (op, 0)) == LABEL_REF)
&& (GET_CODE (XEXP (op, 1)) == CONST_INT
|| (GET_CODE (XEXP (op, 1)) == CONST_DOUBLE
&& GET_MODE (XEXP (op, 1)) == VOIDmode)))
return 1;
/* Fall through. */
default:
return address_operand (op, mode);
}
})
;; True if this is a register or CONST_INT (or CONST_DOUBLE for DImode).
;; We could narrow the value down with a couple of predicates, but that
;; doesn't seem to be worth it at the moment.
(define_predicate "mmix_reg_or_constant_operand"
(ior (match_operand 0 "register_operand")
(ior (match_code "const_int")
(and (match_code "const_double")
(match_test "GET_MODE (op) == VOIDmode")))))
;; True if this is a register or 0 (int or float).
(define_predicate "mmix_reg_or_0_operand"
(ior
(match_operand 0 "register_operand")
(ior
(and (match_code "const_int")
(match_test "op == const0_rtx"))
(and
(match_code "const_double")
;; FIXME: Is mode calculation necessary and correct?
(match_test
"op == CONST0_RTX (mode == VOIDmode ? GET_MODE (op) : mode)")))))
;; True if this is a register or an int 0..255.
(define_predicate "mmix_reg_or_8bit_operand"
(ior
(match_operand 0 "register_operand")
(and (match_code "const_int")
(match_test "CONST_OK_FOR_LETTER_P (INTVAL (op), 'I')"))))
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