1 ;; Predicate definitions for Motorola 68000.
2 ;; Copyright (C) 2005 Free Software Foundation, Inc.
4 ;; This file is part of GCC.
6 ;; GCC is free software; you can redistribute it and/or modify
7 ;; it under the terms of the GNU General Public License as published by
8 ;; the Free Software Foundation; either version 2, or (at your option)
11 ;; GCC is distributed in the hope that it will be useful,
12 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
13 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 ;; GNU General Public License for more details.
16 ;; You should have received a copy of the GNU General Public License
17 ;; along with GCC; see the file COPYING. If not, write to
18 ;; the Free Software Foundation, 51 Franklin Street, Fifth Floor,
19 ;; Boston, MA 02110-1301, USA.
21 ;; Special case of a general operand that's used as a source
22 ;; operand. Use this to permit reads from PC-relative memory when
23 ;; -mpcrel is specified.
25 (define_predicate "general_src_operand"
26 (match_code "const_int,const_double,const,symbol_ref,label_ref,subreg,reg,mem")
29 && GET_CODE (op) == MEM
30 && (GET_CODE (XEXP (op, 0)) == SYMBOL_REF
31 || GET_CODE (XEXP (op, 0)) == LABEL_REF
32 || GET_CODE (XEXP (op, 0)) == CONST))
34 return general_operand (op, mode);
37 ;; Special case of a nonimmediate operand that's used as a source. Use
38 ;; this to permit reads from PC-relative memory when -mpcrel is
41 (define_predicate "nonimmediate_src_operand"
42 (match_code "subreg,reg,mem")
44 if (TARGET_PCREL && GET_CODE (op) == MEM
45 && (GET_CODE (XEXP (op, 0)) == SYMBOL_REF
46 || GET_CODE (XEXP (op, 0)) == LABEL_REF
47 || GET_CODE (XEXP (op, 0)) == CONST))
49 return nonimmediate_operand (op, mode);
52 ;; Special case of a memory operand that's used as a source. Use this
53 ;; to permit reads from PC-relative memory when -mpcrel is specified.
55 (define_predicate "memory_src_operand"
56 (match_code "subreg,mem")
58 if (TARGET_PCREL && GET_CODE (op) == MEM
59 && (GET_CODE (XEXP (op, 0)) == SYMBOL_REF
60 || GET_CODE (XEXP (op, 0)) == LABEL_REF
61 || GET_CODE (XEXP (op, 0)) == CONST))
63 return memory_operand (op, mode);
66 ;; Similar to general_operand, but exclude stack_pointer_rtx.
68 (define_predicate "not_sp_operand"
69 (match_code "subreg,reg,mem")
71 return op != stack_pointer_rtx && nonimmediate_operand (op, mode);
74 ;; Predicate that accepts only a pc-relative address. This is needed
75 ;; because pc-relative addresses don't satisfy the predicate
76 ;; "general_src_operand".
78 (define_predicate "pcrel_address"
79 (match_code "symbol_ref,label_ref,const"))
81 ;; Accept integer operands in the range 0..0xffffffff. We have to
82 ;; check the range carefully since this predicate is used in DImode
83 ;; contexts. Also, we need some extra crud to make it work when
84 ;; hosted on 64-bit machines.
86 (define_predicate "const_uint32_operand"
87 (match_code "const_int,const_double")
89 /* It doesn't make sense to ask this question with a mode that is
90 not larger than 32 bits. */
91 gcc_assert (GET_MODE_BITSIZE (mode) > 32);
93 #if HOST_BITS_PER_WIDE_INT > 32
94 /* All allowed constants will fit a CONST_INT. */
95 return (GET_CODE (op) == CONST_INT
96 && (INTVAL (op) >= 0 && INTVAL (op) <= 0xffffffffL));
98 return (GET_CODE (op) == CONST_INT
99 || (GET_CODE (op) == CONST_DOUBLE && CONST_DOUBLE_HIGH (op) == 0));
103 ;; Accept integer operands in the range -0x80000000..0x7fffffff. We
104 ;; have to check the range carefully since this predicate is used in
107 (define_predicate "const_sint32_operand"
108 (match_code "const_int")
110 /* It doesn't make sense to ask this question with a mode that is
111 not larger than 32 bits. */
112 gcc_assert (GET_MODE_BITSIZE (mode) > 32);
114 /* All allowed constants will fit a CONST_INT. */
115 return (GET_CODE (op) == CONST_INT
116 && (INTVAL (op) >= (-0x7fffffff - 1) && INTVAL (op) <= 0x7fffffff));
119 ;; Return true if X is a valid comparison operator for the dbcc
120 ;; instruction. Note it rejects floating point comparison
121 ;; operators. (In the future we could use Fdbcc). It also rejects
122 ;; some comparisons when CC_NO_OVERFLOW is set.
124 (define_predicate "valid_dbcc_comparison_p"
125 (and (match_code "eq,ne,gtu,ltu,geu,leu,gt,lt,ge,le")
126 (match_test "valid_dbcc_comparison_p_2 (op, mode)")))
128 ;; Check for sign_extend or zero_extend. Used for bit-count operands.
130 (define_predicate "extend_operator"
131 (match_code "sign_extend,zero_extend"))
133 ;; Returns true if OP is either a symbol reference or a sum of a
134 ;; symbol reference and a constant.
136 (define_predicate "symbolic_operand"
137 (match_code "symbol_ref,label_ref,const")
139 switch (GET_CODE (op))
147 return ((GET_CODE (XEXP (op, 0)) == SYMBOL_REF
148 || GET_CODE (XEXP (op, 0)) == LABEL_REF)
149 && GET_CODE (XEXP (op, 1)) == CONST_INT);
151 #if 0 /* Deleted, with corresponding change in m68k.h,
152 so as to fit the specs. No CONST_DOUBLE is ever symbolic. */
154 return GET_MODE (op) == mode;
162 ;; TODO: Add a comment here.
164 (define_predicate "post_inc_operand"
165 (and (match_code "mem")
166 (match_test "GET_CODE (XEXP (op, 0)) == POST_INC")))
168 ;; TODO: Add a comment here.
170 (define_predicate "pre_dec_operand"
171 (and (match_code "mem")
172 (match_test "GET_CODE (XEXP (op, 0)) == PRE_DEC")))