1 ;; Machine Descriptions for R8C/M16C/M32C
2 ;; Copyright (C) 2005-2018 Free Software Foundation, Inc.
3 ;; Contributed by Red Hat.
5 ;; This file is part of GCC.
7 ;; GCC is free software; you can redistribute it and/or modify it
8 ;; under the terms of the GNU General Public License as published
9 ;; by the Free Software Foundation; either version 3, or (at your
10 ;; option) any later version.
12 ;; GCC is distributed in the hope that it will be useful, but WITHOUT
13 ;; ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
14 ;; or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
15 ;; License for more details.
17 ;; You should have received a copy of the GNU General Public License
18 ;; along with GCC; see the file COPYING3. If not see
19 ;; <http://www.gnu.org/licenses/>.
21 ; conditionals - cmp, jcc, setcc, etc.
23 ; Special note about conditional instructions: GCC always emits the
24 ; compare right before the insn, which is good, because m32c's mov
25 ; insns modify the flags. However, this means that any conditional
26 ; insn that may require reloading must be kept with its compare until
27 ; after reload finishes, else the reload insns might clobber the
28 ; flags. Thus, these rules:
30 ; * the cmp* expanders just save the operands in compare_op0 and
31 ; compare_op1 via m32c_pend_compare.
32 ; * conditional insns that won't need reload can call
33 ; m32c_unpend_compare before their expansion.
34 ; * other insns must expand to include the compare operands within,
35 ; then split after reload to a separate compare and conditional.
37 ; Until support for relaxing is supported in gas, we must assume that
38 ; short labels won't reach, so we must use long labels.
39 ; Unfortunately, there aren't any conditional jumps with long labels,
40 ; so instead we invert the conditional and jump around a regular jump.
42 ; Note that we can, at some point in the future, add code to omit the
43 ; "cmp" portion of the insn if the preceding insn happened to set the
44 ; right flags already. For example, a mov followed by a "cmp *,0" is
45 ; redundant; the move already set the Z flag.
47 (define_insn_and_split "cbranch<mode>4"
48 [(set (pc) (if_then_else
49 (match_operator 0 "m32c_cmp_operator"
50 [(match_operand:QHPSI 1 "mra_operand" "RraSd")
51 (match_operand:QHPSI 2 "mrai_operand" "iRraSd")])
52 (label_ref (match_operand 3 "" ""))
57 [(set (reg:CC FLG_REGNO)
58 (compare (match_dup 1)
60 (set (pc) (if_then_else (match_op_dup 0 [(reg:CC FLG_REGNO) (const_int 0)])
61 (label_ref (match_dup 3))
68 (if_then_else (match_operator 0 "ordered_comparison_operator"
69 [(reg:CC FLG_REGNO) (const_int 0)])
70 (label_ref (match_operand 1 ""))
74 [(set_attr "flags" "n")]
77 (define_insn "stzx_16"
78 [(set (match_operand:QI 0 "register_operand" "=R0w,R0w,R0w")
79 (if_then_else:QI (eq (reg:CC FLG_REGNO) (const_int 0))
80 (match_operand:QI 1 "const_int_operand" "i,i,0")
81 (match_operand:QI 2 "const_int_operand" "i,0,i")))]
82 "TARGET_A16 && reload_completed"
87 [(set_attr "flags" "n,n,n")]
90 (define_insn "stzx_24_<mode>"
91 [(set (match_operand:QHI 0 "mra_operand" "=RraSd,RraSd,RraSd")
92 (if_then_else:QHI (eq (reg:CC FLG_REGNO) (const_int 0))
93 (match_operand:QHI 1 "const_int_operand" "i,i,0")
94 (match_operand:QHI 2 "const_int_operand" "i,0,i")))]
95 "TARGET_A24 && reload_completed"
100 [(set_attr "flags" "n,n,n")])
102 (define_insn_and_split "stzx_reversed_<mode>"
103 [(set (match_operand:QHI 0 "m32c_r0_operand" "=R0w")
104 (if_then_else:QHI (ne (reg:CC FLG_REGNO) (const_int 0))
105 (match_operand:QHI 1 "const_int_operand" "")
106 (match_operand:QHI 2 "const_int_operand" "")))]
107 "(TARGET_A24 || GET_MODE (operands[0]) == QImode) && reload_completed"
111 (if_then_else:QHI (eq (reg:CC FLG_REGNO) (const_int 0))
118 (define_insn "cmp<mode>_op"
119 [(set (reg:CC FLG_REGNO)
120 (compare (match_operand:QHPSI 0 "mra_operand" "RraSd")
121 (match_operand:QHPSI 1 "mrai_operand" "RraSdi")))]
123 "* return m32c_output_compare(insn, operands); "
124 [(set_attr "flags" "oszc")])
126 ;; m32c_conditional_register_usage changes the setcc_gen_code array to
127 ;; point to the _24 variants if needed.
129 ;; We need to keep the compare and conditional sets together through
130 ;; reload, because reload might need to add address reloads to the
131 ;; set, which would clobber the flags. By keeping them together, the
132 ;; reloads get put before the compare, thus preserving the flags.
134 ;; These are the post-split patterns for the conditional sets.
136 (define_insn "scc_op"
137 [(set (match_operand:QI 0 "register_operand" "=Rqi")
138 (match_operator:QI 1 "ordered_comparison_operator"
139 [(reg:CC FLG_REGNO) (const_int 0)]))]
140 "TARGET_A16 && reload_completed"
141 "* return m32c_scc_pattern(operands, GET_CODE (operands[1]));")
143 (define_insn "scc_24_op"
144 [(set (match_operand:HI 0 "mra_operand" "=RhiSd")
145 (match_operator:HI 1 "ordered_comparison_operator"
146 [(reg:CC FLG_REGNO) (const_int 0)]))]
147 "TARGET_A24 && reload_completed"
149 [(set_attr "flags" "n")]
152 ;; These are the pre-split patterns for the conditional sets.
154 (define_expand "cstore<mode>4"
155 [(set (match_operand:QI 0 "register_operand")
156 (match_operator:QI 1 "ordered_comparison_operator"
157 [(match_operand:QHPSI 2 "mra_operand")
158 (match_operand:QHPSI 3 "mrai_operand")]))]
163 rtx o = gen_reg_rtx (HImode);
164 emit_insn (gen_cstore<mode>4_24 (o, operands[1],
165 operands[2], operands[3]));
166 emit_move_insn (operands[0], gen_lowpart (QImode, o));
171 (define_insn_and_split "*cstore<mode>4_16"
172 [(set (match_operand:QI 0 "register_operand" "=Rqi")
173 (match_operator:QI 1 "ordered_comparison_operator"
174 [(match_operand:QHPSI 2 "mra_operand" "RraSd")
175 (match_operand:QHPSI 3 "mrai_operand" "RraSdi")]))]
178 "&& reload_completed"
179 [(set (reg:CC FLG_REGNO)
180 (compare (match_dup 2)
183 (match_op_dup 1 [(reg:CC FLG_REGNO) (const_int 0)]))]
185 [(set_attr "flags" "x")]
188 (define_insn_and_split "cstore<mode>4_24"
189 [(set (match_operand:HI 0 "mra_nopp_operand" "=RhiSd")
190 (match_operator:HI 1 "ordered_comparison_operator"
191 [(match_operand:QHPSI 2 "mra_operand" "RraSd")
192 (match_operand:QHPSI 3 "mrai_operand" "RraSdi")]))]
195 "&& reload_completed"
196 [(set (reg:CC FLG_REGNO)
197 (compare (match_dup 2)
200 (match_op_dup 1 [(reg:CC FLG_REGNO) (const_int 0)]))]
202 [(set_attr "flags" "x")]
205 (define_insn_and_split "movqicc_<code>_<mode>"
206 [(set (match_operand:QI 0 "register_operand" "=R0w")
207 (if_then_else:QI (eqne_cond (match_operand:QHPSI 1 "mra_operand" "RraSd")
208 (match_operand:QHPSI 2 "mrai_operand" "RraSdi"))
209 (match_operand:QI 3 "const_int_operand" "")
210 (match_operand:QI 4 "const_int_operand" "")))]
214 [(set (reg:CC FLG_REGNO)
215 (compare (match_dup 1)
218 (if_then_else:QI (eqne_cond (reg:CC FLG_REGNO) (const_int 0))
222 [(set_attr "flags" "x")]
225 (define_insn_and_split "movhicc_<code>_<mode>"
226 [(set (match_operand:HI 0 "register_operand" "=R0w")
227 (if_then_else:HI (eqne_cond (match_operand:QHPSI 1 "mra_operand" "RraSd")
228 (match_operand:QHPSI 2 "mrai_operand" "RraSdi"))
229 (match_operand:HI 3 "const_int_operand" "")
230 (match_operand:HI 4 "const_int_operand" "")))]
234 [(set (reg:CC FLG_REGNO)
235 (compare (match_dup 1)
238 (if_then_else:HI (eqne_cond (reg:CC FLG_REGNO) (const_int 0))
242 [(set_attr "flags" "x")]
245 ;; And these are the expanders.
247 (define_expand "movqicc"
248 [(set (match_operand:QI 0 "register_operand" "")
249 (if_then_else:QI (match_operand 1 "m32c_eqne_operator" "")
250 (match_operand:QI 2 "const_int_operand" "")
251 (match_operand:QI 3 "const_int_operand" "")))]
253 "if (m32c_expand_movcc(operands))
258 (define_expand "movhicc"
259 [(set (match_operand:HI 0 "mra_operand" "")
260 (if_then_else:HI (match_operand 1 "m32c_eqne_operator" "")
261 (match_operand:HI 2 "const_int_operand" "")
262 (match_operand:HI 3 "const_int_operand" "")))]
264 "if (m32c_expand_movcc(operands))
270 ;; CMP opcodes subtract two values, set the flags, and discard the
271 ;; value. This pattern recovers the sign of the discarded value based
272 ;; on the flags. Operand 0 is set to -1, 0, or 1. This is used for
273 ;; the cmpstr pattern. For optimal code, this should be removed if
274 ;; followed by a suitable CMP insn (see the peephole following). This
275 ;; pattern is 7 bytes and 5 cycles. If you don't need specific
276 ;; values, a 5/4 pattern can be made with SCGT and BMLT to set the
279 (define_insn "cond_to_int"
280 [(set (match_operand:HI 0 "mra_qi_operand" "=Rqi")
281 (if_then_else:HI (lt (reg:CC FLG_REGNO) (const_int 0))
283 (if_then_else:HI (eq (reg:CC FLG_REGNO) (const_int 0))
287 "sceq\t%0\n\tbmgt\t1,%h0\n\tdec.w\t%0"
288 [(set_attr "flags" "x")]
291 ;; A cond_to_int followed by a compare against zero is essentially a
292 ;; no-op. However, the result of the cond_to_int may be used by later
293 ;; insns, so make sure it's dead before deleting its set.
296 [(set (match_operand:HI 0 "mra_qi_operand" "")
297 (if_then_else:HI (lt (reg:CC FLG_REGNO) (const_int 0))
299 (if_then_else:HI (eq (reg:CC FLG_REGNO) (const_int 0))
302 (set (reg:CC FLG_REGNO)
303 (compare (match_operand:HI 1 "mra_qi_operand" "")
306 "rtx_equal_p (operands[0], operands[1])
307 && dead_or_set_p (peep2_next_insn (1), operands[0])"