1 ;; Predicate definitions for Motorola 68000.
2 ;; Copyright (C) 2005, 2007 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 3, 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 COPYING3. If not see
18 ;; <http://www.gnu.org/licenses/>.
20 ;; Special case of a general operand that's used as a source
21 ;; operand. Use this to permit reads from PC-relative memory when
22 ;; -mpcrel is specified.
24 (define_predicate "general_src_operand"
25 (match_code "const_int,const_double,const,symbol_ref,label_ref,subreg,reg,mem")
28 && GET_CODE (op) == MEM
29 && (GET_CODE (XEXP (op, 0)) == SYMBOL_REF
30 || GET_CODE (XEXP (op, 0)) == LABEL_REF
31 || GET_CODE (XEXP (op, 0)) == CONST))
33 return general_operand (op, mode);
36 ;; Special case of a nonimmediate operand that's used as a source. Use
37 ;; this to permit reads from PC-relative memory when -mpcrel is
40 (define_predicate "nonimmediate_src_operand"
41 (match_code "subreg,reg,mem")
43 if (TARGET_PCREL && GET_CODE (op) == MEM
44 && (GET_CODE (XEXP (op, 0)) == SYMBOL_REF
45 || GET_CODE (XEXP (op, 0)) == LABEL_REF
46 || GET_CODE (XEXP (op, 0)) == CONST))
48 return nonimmediate_operand (op, mode);
51 ;; Special case of a memory operand that's used as a source. Use this
52 ;; to permit reads from PC-relative memory when -mpcrel is specified.
54 (define_predicate "memory_src_operand"
55 (match_code "subreg,mem")
57 if (TARGET_PCREL && GET_CODE (op) == MEM
58 && (GET_CODE (XEXP (op, 0)) == SYMBOL_REF
59 || GET_CODE (XEXP (op, 0)) == LABEL_REF
60 || GET_CODE (XEXP (op, 0)) == CONST))
62 return memory_operand (op, mode);
65 ;; Similar to general_operand, but exclude stack_pointer_rtx.
67 (define_predicate "not_sp_operand"
68 (match_code "subreg,reg,mem")
70 return op != stack_pointer_rtx && nonimmediate_operand (op, mode);
73 ;; Predicate that accepts only a pc-relative address. This is needed
74 ;; because pc-relative addresses don't satisfy the predicate
75 ;; "general_src_operand".
77 (define_predicate "pcrel_address"
78 (match_code "symbol_ref,label_ref,const"))
80 ;; Accept integer operands in the range 0..0xffffffff. We have to
81 ;; check the range carefully since this predicate is used in DImode
82 ;; contexts. Also, we need some extra crud to make it work when
83 ;; hosted on 64-bit machines.
85 (define_predicate "const_uint32_operand"
86 (match_code "const_int,const_double")
88 /* It doesn't make sense to ask this question with a mode that is
89 not larger than 32 bits. */
90 gcc_assert (GET_MODE_BITSIZE (mode) > 32);
92 #if HOST_BITS_PER_WIDE_INT > 32
93 /* All allowed constants will fit a CONST_INT. */
94 return (GET_CODE (op) == CONST_INT
95 && (INTVAL (op) >= 0 && INTVAL (op) <= 0xffffffffL));
97 return (GET_CODE (op) == CONST_INT
98 || (GET_CODE (op) == CONST_DOUBLE && CONST_DOUBLE_HIGH (op) == 0));
102 ;; Accept integer operands in the range -0x80000000..0x7fffffff. We
103 ;; have to check the range carefully since this predicate is used in
106 (define_predicate "const_sint32_operand"
107 (match_code "const_int")
109 /* It doesn't make sense to ask this question with a mode that is
110 not larger than 32 bits. */
111 gcc_assert (GET_MODE_BITSIZE (mode) > 32);
113 /* All allowed constants will fit a CONST_INT. */
114 return (GET_CODE (op) == CONST_INT
115 && (INTVAL (op) >= (-0x7fffffff - 1) && INTVAL (op) <= 0x7fffffff));
118 ;; Return true if X is a valid comparison operator for the dbcc
119 ;; instruction. Note it rejects floating point comparison
120 ;; operators. (In the future we could use Fdbcc). It also rejects
121 ;; some comparisons when CC_NO_OVERFLOW is set.
123 (define_predicate "valid_dbcc_comparison_p"
124 (and (match_code "eq,ne,gtu,ltu,geu,leu,gt,lt,ge,le")
125 (match_test "valid_dbcc_comparison_p_2 (op, mode)")))
127 ;; Check for sign_extend or zero_extend. Used for bit-count operands.
129 (define_predicate "extend_operator"
130 (match_code "sign_extend,zero_extend"))
132 ;; Returns true if OP is either a symbol reference or a sum of a
133 ;; symbol reference and a constant.
135 (define_predicate "symbolic_operand"
136 (match_code "symbol_ref,label_ref,const")
138 switch (GET_CODE (op))
146 return ((GET_CODE (XEXP (op, 0)) == SYMBOL_REF
147 || GET_CODE (XEXP (op, 0)) == LABEL_REF)
148 && GET_CODE (XEXP (op, 1)) == CONST_INT);
150 #if 0 /* Deleted, with corresponding change in m68k.h,
151 so as to fit the specs. No CONST_DOUBLE is ever symbolic. */
153 return GET_MODE (op) == mode;
161 ;; A constant that can be used the address in a call insn
162 (define_predicate "const_call_operand"
163 (ior (match_operand 0 "const_int_operand")
164 (and (match_test "m68k_symbolic_call != NULL")
165 (match_operand 0 "symbolic_operand"))))
167 ;; An operand that can be used as the address in a call insn.
168 (define_predicate "call_operand"
169 (ior (match_operand 0 "const_call_operand")
170 (match_operand 0 "register_operand")))
172 ;; A constant that can be used the address in a sibcall insn
173 (define_predicate "const_sibcall_operand"
174 (ior (match_operand 0 "const_int_operand")
175 (and (match_test "m68k_symbolic_jump != NULL")
176 (match_operand 0 "symbolic_operand"))))
178 ;; An operand that can be used as the address in a sibcall insn.
179 (define_predicate "sibcall_operand"
180 (ior (match_operand 0 "const_sibcall_operand")
181 (and (match_code "reg")
182 (match_test "REGNO (op) == STATIC_CHAIN_REGNUM"))))
184 ;; TODO: Add a comment here.
186 (define_predicate "post_inc_operand"
187 (and (match_code "mem")
188 (match_test "GET_CODE (XEXP (op, 0)) == POST_INC")))
190 ;; TODO: Add a comment here.
192 (define_predicate "pre_dec_operand"
193 (and (match_code "mem")
194 (match_test "GET_CODE (XEXP (op, 0)) == PRE_DEC")))
196 ;; An operand for movsi_const0 pattern.
197 (define_predicate "movsi_const0_operand"
198 (and (match_operand 0 "nonimmediate_operand")
199 (match_test "(TARGET_68010 || TARGET_COLDFIRE)
200 || !(MEM_P (op) && MEM_VOLATILE_P (op))")))
202 ;; A non-symbolic call operand.
203 ;; We need to special case 'const_int' to ignore its mode while matching.
204 (define_predicate "non_symbolic_call_operand"
205 (and (match_operand 0 "call_operand")
206 (ior (and (match_code "const_int")
207 (match_test "!symbolic_operand (op, mode)"))
208 (match_test "!symbolic_operand (op,mode)"))))
210 ;; Special case of general_src_operand, which rejects a few fp
211 ;; constants (which we prefer in registers) before reload.
213 (define_predicate "fp_src_operand"
214 (match_operand 0 "general_src_operand")
216 return !CONSTANT_P (op)
218 && (!standard_68881_constant_p (op)
219 || reload_in_progress
220 || reload_completed));