;; Predicate definitions for Motorola 68000. ;; 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.

;; Special case of a general operand that's used as a source ;; operand. Use this to permit reads from PC-relative memory when ;; -mpcrel is specified.

(define_predicate “general_src_operand” (match_code “const_int,const_double,const,symbol_ref,label_ref,subreg,reg,mem”) { if (TARGET_PCREL && GET_CODE (op) == MEM && (GET_CODE (XEXP (op, 0)) == SYMBOL_REF || GET_CODE (XEXP (op, 0)) == LABEL_REF || GET_CODE (XEXP (op, 0)) == CONST)) return 1; return general_operand (op, mode); })

;; Special case of a nonimmediate operand that's used as a source. Use ;; this to permit reads from PC-relative memory when -mpcrel is ;; specified.

(define_predicate “nonimmediate_src_operand” (match_code “subreg,reg,mem”) { if (TARGET_PCREL && GET_CODE (op) == MEM && (GET_CODE (XEXP (op, 0)) == SYMBOL_REF || GET_CODE (XEXP (op, 0)) == LABEL_REF || GET_CODE (XEXP (op, 0)) == CONST)) return 1; return nonimmediate_operand (op, mode); })

;; Special case of a memory operand that's used as a source. Use this ;; to permit reads from PC-relative memory when -mpcrel is specified.

(define_predicate “memory_src_operand” (match_code “subreg,mem”) { if (TARGET_PCREL && GET_CODE (op) == MEM && (GET_CODE (XEXP (op, 0)) == SYMBOL_REF || GET_CODE (XEXP (op, 0)) == LABEL_REF || GET_CODE (XEXP (op, 0)) == CONST)) return 1; return memory_operand (op, mode); })

;; Similar to general_operand, but exclude stack_pointer_rtx.

(define_predicate “not_sp_operand” (match_code “subreg,reg,mem”) { return op != stack_pointer_rtx && nonimmediate_operand (op, mode); })

;; Predicate that accepts only a pc-relative address. This is needed ;; because pc-relative addresses don't satisfy the predicate ;; “general_src_operand”.

(define_predicate “pcrel_address” (match_code “symbol_ref,label_ref,const”))

;; Accept integer operands in the range 0..0xffffffff. We have to ;; check the range carefully since this predicate is used in DImode ;; contexts. Also, we need some extra crud to make it work when ;; hosted on 64-bit machines.

(define_predicate “const_uint32_operand” (match_code “const_int,const_double”) { /* It doesn't make sense to ask this question with a mode that is not larger than 32 bits. */ gcc_assert (GET_MODE_BITSIZE (mode) > 32);

#if HOST_BITS_PER_WIDE_INT > 32 /* All allowed constants will fit a CONST_INT. */ return (GET_CODE (op) == CONST_INT && (INTVAL (op) >= 0 && INTVAL (op) <= 0xffffffffL)); #else return (GET_CODE (op) == CONST_INT || (GET_CODE (op) == CONST_DOUBLE && CONST_DOUBLE_HIGH (op) == 0)); #endif })

;; Accept integer operands in the range -0x80000000..0x7fffffff. We ;; have to check the range carefully since this predicate is used in ;; DImode contexts.

(define_predicate “const_sint32_operand” (match_code “const_int”) { /* It doesn't make sense to ask this question with a mode that is not larger than 32 bits. */ gcc_assert (GET_MODE_BITSIZE (mode) > 32);

/* All allowed constants will fit a CONST_INT. */ return (GET_CODE (op) == CONST_INT && (INTVAL (op) >= (-0x7fffffff - 1) && INTVAL (op) <= 0x7fffffff)); })

;; Return true if X is a valid comparison operator for the dbcc ;; instruction. Note it rejects floating point comparison ;; operators. (In the future we could use Fdbcc). It also rejects ;; some comparisons when CC_NO_OVERFLOW is set.

(define_predicate “valid_dbcc_comparison_p” (and (match_code “eq,ne,gtu,ltu,geu,leu,gt,lt,ge,le”) (match_test “valid_dbcc_comparison_p_2 (op, mode)”)))

;; Check for sign_extend or zero_extend. Used for bit-count operands.

(define_predicate “extend_operator” (match_code “sign_extend,zero_extend”))

;; Returns true if OP is either a symbol reference or a sum of a ;; symbol reference and a constant.

(define_predicate “symbolic_operand” (match_code “symbol_ref,label_ref,const”) { switch (GET_CODE (op)) { case SYMBOL_REF: case LABEL_REF: return true;

case CONST:
  op = XEXP (op, 0);
  return ((GET_CODE (XEXP (op, 0)) == SYMBOL_REF
       || GET_CODE (XEXP (op, 0)) == LABEL_REF)
      && GET_CODE (XEXP (op, 1)) == CONST_INT);

#if 0 /* Deleted, with corresponding change in m68k.h, so as to fit the specs. No CONST_DOUBLE is ever symbolic. */ case CONST_DOUBLE: return GET_MODE (op) == mode; #endif

default:
  return false;
}

})

;; TODO: Add a comment here.

(define_predicate “post_inc_operand” (and (match_code “mem”) (match_test “GET_CODE (XEXP (op, 0)) == POST_INC”)))

;; TODO: Add a comment here.

(define_predicate “pre_dec_operand” (and (match_code “mem”) (match_test “GET_CODE (XEXP (op, 0)) == PRE_DEC”)))