;; Predicate definitions for Motorola 68000. ;; Copyright (C) 2005-2021 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/.

;; 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)); })

(define_predicate “m68k_cstore_comparison_operator” (if_then_else (match_test “TARGET_68881”) (match_operand 0 “comparison_operator”) (match_operand 0 “ordered_comparison_operator”)))

;; 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. This predicate is for “raw” ;; symbol references not yet processed by legitimize*address, ;; hence we do not handle UNSPEC{XGOT, TLS, XTLS} here.

(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;
}

})

;; A constant that can be used the address in a call insn (define_predicate “const_call_operand” (ior (match_operand 0 “const_int_operand”) (and (match_test “m68k_symbolic_call != NULL”) (match_operand 0 “symbolic_operand”))))

;; An operand that can be used as the address in a call insn. (define_predicate “call_operand” (ior (match_operand 0 “const_call_operand”) (match_operand 0 “register_operand”)))

;; A constant that can be used the address in a sibcall insn (define_predicate “const_sibcall_operand” (ior (match_operand 0 “const_int_operand”) (and (match_test “m68k_symbolic_jump != NULL”) (match_operand 0 “symbolic_operand”))))

;; An operand that can be used as the address in a sibcall insn. (define_predicate “sibcall_operand” (ior (match_operand 0 “const_sibcall_operand”) (and (match_code “reg”) (match_test “REGNO (op) == STATIC_CHAIN_REGNUM”))))

;; 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”)))

;; A zero constant. (define_predicate “const0_operand” (and (match_code “const_int,const_double,const_vector”) (match_test “op == CONST0_RTX (mode)”)))

;; A one constant (operand for conditional_trap). (define_predicate “const1_operand” (and (match_code “const_int”) (match_test “op == const1_rtx”)))

;; A valid operand for a conditional operation. ;; ColdFire has tst patterns for HImode and QImode, but not cmp patterns. (define_predicate “m68k_comparison_operand” (if_then_else (match_test “TARGET_COLDFIRE && mode != SImode”) (and (match_code “const_int”) (match_test “op == const0_rtx”)) (match_operand 0 “general_src_operand”)))

;; An operand for movsi_const0 pattern. (define_predicate “movsi_const0_operand” (and (match_operand 0 “nonimmediate_operand”) (match_test “(TARGET_68010 || TARGET_COLDFIRE) || !(MEM_P (op) && MEM_VOLATILE_P (op))”)))

;; A non-symbolic call operand. ;; We need to special case ‘const_int’ to ignore its mode while matching. (define_predicate “non_symbolic_call_operand” (and (match_operand 0 “call_operand”) (ior (and (match_code “const_int”) (match_test “!symbolic_operand (op, mode)”)) (match_test “!symbolic_operand (op,mode)”))))

;; Special case of general_src_operand, which rejects a few fp ;; constants (which we prefer in registers) before reload. ;; Used only in comparisons, and we do want to allow zero.

(define_predicate “fp_src_operand” (match_operand 0 “general_src_operand”) { return (!CONSTANT_P (op) || op == CONST0_RTX (mode) || (TARGET_68881 && (!standard_68881_constant_p (op) || reload_in_progress || reload_completed))); })

;; Used to detect constants that are valid for addq/subq instructions (define_predicate “addq_subq_operand” (match_code “const_int”) { return ((INTVAL (op) <= 8 && INTVAL (op) > 0) || (INTVAL (op) >= -8 && INTVAL (op) < 0)); })

;; Used to detect equality and non-equality operators (define_predicate “equality_comparison_operator” (match_code “eq,ne”))

;; Used to detect when an operand is either a register ;; or a constant that is all ones in its lower bits. ;; Used by insv pattern to help detect when we're initializing ;; a bitfield to all ones.

(define_predicate “reg_or_pow2_m1_operand” (match_code “reg,const_int”) { return (REG_P (op) || pow2_m1_operand (op, VOIDmode)); })

;; Used to detect a constant that is all ones in its lower bits. (define_predicate “pow2_m1_operand” (match_code “const_int”) { return (GET_CODE (op) == CONST_INT && exact_log2 (INTVAL (op) + 1) >= 0); })

;; Used to detect valid targets for conditional branches ;; Used to detect (pc) or (label_ref) in some jumping patterns to cut down (define_predicate “pc_or_label_operand” (match_code “pc,label_ref”))

(define_predicate “swap_peephole_relational_operator” (match_code “gtu,leu,gt,le”))

(define_predicate “address_reg_operand” (match_test (“ADDRESS_REG_P (op)”)))