1 ;; Predicate definitions for Motorola 68000.
2 ;; Copyright (C) 2005-2018 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 (define_predicate "m68k_cstore_comparison_operator"
128 (if_then_else (match_test "TARGET_68881")
129 (match_operand 0 "comparison_operator")
130 (match_operand 0 "ordered_comparison_operator")))
132 ;; Check for sign_extend or zero_extend. Used for bit-count operands.
134 (define_predicate "extend_operator"
135 (match_code "sign_extend,zero_extend"))
137 ;; Returns true if OP is either a symbol reference or a sum of a
138 ;; symbol reference and a constant. This predicate is for "raw"
139 ;; symbol references not yet processed by legitimize*_address,
140 ;; hence we do not handle UNSPEC_{XGOT, TLS, XTLS} here.
142 (define_predicate "symbolic_operand"
143 (match_code "symbol_ref,label_ref,const")
145 switch (GET_CODE (op))
153 return ((GET_CODE (XEXP (op, 0)) == SYMBOL_REF
154 || GET_CODE (XEXP (op, 0)) == LABEL_REF)
155 && GET_CODE (XEXP (op, 1)) == CONST_INT);
157 #if 0 /* Deleted, with corresponding change in m68k.h,
158 so as to fit the specs. No CONST_DOUBLE is ever symbolic. */
160 return GET_MODE (op) == mode;
168 ;; A constant that can be used the address in a call insn
169 (define_predicate "const_call_operand"
170 (ior (match_operand 0 "const_int_operand")
171 (and (match_test "m68k_symbolic_call != NULL")
172 (match_operand 0 "symbolic_operand"))))
174 ;; An operand that can be used as the address in a call insn.
175 (define_predicate "call_operand"
176 (ior (match_operand 0 "const_call_operand")
177 (match_operand 0 "register_operand")))
179 ;; A constant that can be used the address in a sibcall insn
180 (define_predicate "const_sibcall_operand"
181 (ior (match_operand 0 "const_int_operand")
182 (and (match_test "m68k_symbolic_jump != NULL")
183 (match_operand 0 "symbolic_operand"))))
185 ;; An operand that can be used as the address in a sibcall insn.
186 (define_predicate "sibcall_operand"
187 (ior (match_operand 0 "const_sibcall_operand")
188 (and (match_code "reg")
189 (match_test "REGNO (op) == STATIC_CHAIN_REGNUM"))))
191 ;; TODO: Add a comment here.
193 (define_predicate "post_inc_operand"
194 (and (match_code "mem")
195 (match_test "GET_CODE (XEXP (op, 0)) == POST_INC")))
197 ;; TODO: Add a comment here.
199 (define_predicate "pre_dec_operand"
200 (and (match_code "mem")
201 (match_test "GET_CODE (XEXP (op, 0)) == PRE_DEC")))
204 (define_predicate "const0_operand"
205 (and (match_code "const_int,const_double,const_vector")
206 (match_test "op == CONST0_RTX (mode)")))
208 ;; A one constant (operand for conditional_trap).
209 (define_predicate "const1_operand"
210 (and (match_code "const_int")
211 (match_test "op == const1_rtx")))
213 ;; A valid operand for a HImode or QImode conditional operation.
214 ;; ColdFire has tst patterns, but not cmp patterns.
215 (define_predicate "m68k_subword_comparison_operand"
216 (if_then_else (match_test "TARGET_COLDFIRE")
217 (and (match_code "const_int")
218 (match_test "op == const0_rtx"))
219 (match_operand 0 "general_src_operand")))
221 ;; An operand for movsi_const0 pattern.
222 (define_predicate "movsi_const0_operand"
223 (and (match_operand 0 "nonimmediate_operand")
224 (match_test "(TARGET_68010 || TARGET_COLDFIRE)
225 || !(MEM_P (op) && MEM_VOLATILE_P (op))")))
227 ;; A non-symbolic call operand.
228 ;; We need to special case 'const_int' to ignore its mode while matching.
229 (define_predicate "non_symbolic_call_operand"
230 (and (match_operand 0 "call_operand")
231 (ior (and (match_code "const_int")
232 (match_test "!symbolic_operand (op, mode)"))
233 (match_test "!symbolic_operand (op,mode)"))))
235 ;; Special case of general_src_operand, which rejects a few fp
236 ;; constants (which we prefer in registers) before reload.
238 (define_predicate "fp_src_operand"
239 (match_operand 0 "general_src_operand")
241 return !CONSTANT_P (op)
243 && (!standard_68881_constant_p (op)
244 || reload_in_progress
245 || reload_completed));
248 ;; Used to detect constants that are valid for addq/subq instructions
249 (define_predicate "addq_subq_operand"
250 (match_code "const_int")
252 return ((INTVAL (op) <= 8 && INTVAL (op) > 0)
253 || (INTVAL (op) >= -8 && INTVAL (op) < 0));
256 ;; Used to detect equality and non-equality operators
257 (define_predicate "equality_comparison_operator"
258 (match_code "eq,ne"))
260 ;; Used to detect when an operand is either a register
261 ;; or a constant that is all ones in its lower bits.
262 ;; Used by insv pattern to help detect when we're initializing
263 ;; a bitfield to all ones.
265 (define_predicate "reg_or_pow2_m1_operand"
266 (match_code "reg,const_int")
268 return (REG_P (op) || pow2_m1_operand (op, VOIDmode));
271 ;; Used to detect a constant that is all ones in its lower bits.
272 (define_predicate "pow2_m1_operand"
273 (match_code "const_int")
275 return (GET_CODE (op) == CONST_INT && exact_log2 (INTVAL (op) + 1) >= 0);
278 ;; Used to detect valid targets for conditional branches
279 ;; Used to detect (pc) or (label_ref) in some jumping patterns to cut down
280 (define_predicate "pc_or_label_operand"
281 (match_code "pc,label_ref"))
283 (define_predicate "swap_peephole_relational_operator"
284 (match_code "gtu,leu,gt,le"))