1 /* Generate attribute information (insn-attr.h) from machine description.
2 Copyright (C) 1991, 1994, 1996, 1998, 1999, 2000, 2003, 2004
3 Free Software Foundation, Inc.
4 Contributed by Richard Kenner (kenner@vlsi1.ultra.nyu.edu)
5
6 This file is part of GCC.
7
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 2, or (at your option) any later
11 version.
12
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16 for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING. If not, write to the Free
20 Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
21 02110-1301, USA. */
22
23
24 #include "bconfig.h"
25 #include "system.h"
26 #include "coretypes.h"
27 #include "tm.h"
28 #include "rtl.h"
29 #include "errors.h"
30 #include "gensupport.h"
31
32
33 static void write_upcase (const char *);
34 static void gen_attr (rtx);
35
36 static void
write_upcase(const char * str)37 write_upcase (const char *str)
38 {
39 for (; *str; str++)
40 putchar (TOUPPER(*str));
41 }
42
43 static void
gen_attr(rtx attr)44 gen_attr (rtx attr)
45 {
46 const char *p, *tag;
47 int is_const = GET_CODE (XEXP (attr, 2)) == CONST;
48
49 printf ("#define HAVE_ATTR_%s\n", XSTR (attr, 0));
50
51 /* If numeric attribute, don't need to write an enum. */
52 p = XSTR (attr, 1);
53 if (*p == '\0')
54 printf ("extern int get_attr_%s (%s);\n", XSTR (attr, 0),
55 (is_const ? "void" : "rtx"));
56 else
57 {
58 printf ("enum attr_%s {", XSTR (attr, 0));
59
60 while ((tag = scan_comma_elt (&p)) != 0)
61 {
62 write_upcase (XSTR (attr, 0));
63 putchar ('_');
64 while (tag != p)
65 putchar (TOUPPER (*tag++));
66 if (*p == ',')
67 fputs (", ", stdout);
68 }
69
70 fputs ("};\n", stdout);
71 printf ("extern enum attr_%s get_attr_%s (%s);\n\n",
72 XSTR (attr, 0), XSTR (attr, 0), (is_const ? "void" : "rtx"));
73 }
74
75 /* If `length' attribute, write additional function definitions and define
76 variables used by `insn_current_length'. */
77 if (! strcmp (XSTR (attr, 0), "length"))
78 {
79 puts ("\
80 extern void shorten_branches (rtx);\n\
81 extern int insn_default_length (rtx);\n\
82 extern int insn_min_length (rtx);\n\
83 extern int insn_variable_length_p (rtx);\n\
84 extern int insn_current_length (rtx);\n\n\
85 #include \"insn-addr.h\"\n");
86 }
87 }
88
89 int
main(int argc,char ** argv)90 main (int argc, char **argv)
91 {
92 rtx desc;
93 int have_delay = 0;
94 int have_annul_true = 0;
95 int have_annul_false = 0;
96 int num_insn_reservations = 0;
97 int i;
98
99 progname = "genattr";
100
101 if (init_md_reader_args (argc, argv) != SUCCESS_EXIT_CODE)
102 return (FATAL_EXIT_CODE);
103
104 puts ("/* Generated automatically by the program `genattr'");
105 puts (" from the machine description file `md'. */\n");
106 puts ("#ifndef GCC_INSN_ATTR_H");
107 puts ("#define GCC_INSN_ATTR_H\n");
108
109 /* For compatibility, define the attribute `alternative', which is just
110 a reference to the variable `which_alternative'. */
111
112 puts ("#define HAVE_ATTR_alternative");
113 puts ("#define get_attr_alternative(insn) which_alternative");
114
115 /* Read the machine description. */
116
117 while (1)
118 {
119 int line_no, insn_code_number;
120
121 desc = read_md_rtx (&line_no, &insn_code_number);
122 if (desc == NULL)
123 break;
124
125 if (GET_CODE (desc) == DEFINE_ATTR)
126 gen_attr (desc);
127
128 else if (GET_CODE (desc) == DEFINE_DELAY)
129 {
130 if (! have_delay)
131 {
132 printf ("#define DELAY_SLOTS\n");
133 printf ("extern int num_delay_slots (rtx);\n");
134 printf ("extern int eligible_for_delay (rtx, int, rtx, int);\n\n");
135 printf ("extern int const_num_delay_slots (rtx);\n\n");
136 have_delay = 1;
137 }
138
139 for (i = 0; i < XVECLEN (desc, 1); i += 3)
140 {
141 if (XVECEXP (desc, 1, i + 1) && ! have_annul_true)
142 {
143 printf ("#define ANNUL_IFTRUE_SLOTS\n");
144 printf ("extern int eligible_for_annul_true (rtx, int, rtx, int);\n");
145 have_annul_true = 1;
146 }
147
148 if (XVECEXP (desc, 1, i + 2) && ! have_annul_false)
149 {
150 printf ("#define ANNUL_IFFALSE_SLOTS\n");
151 printf ("extern int eligible_for_annul_false (rtx, int, rtx, int);\n");
152 have_annul_false = 1;
153 }
154 }
155 }
156
157 else if (GET_CODE (desc) == DEFINE_INSN_RESERVATION)
158 num_insn_reservations++;
159 }
160
161 if (num_insn_reservations > 0)
162 {
163 /* Output interface for pipeline hazards recognition based on
164 DFA (deterministic finite state automata. */
165 printf ("\n#define INSN_SCHEDULING\n");
166 printf ("\n/* DFA based pipeline interface. */");
167 printf ("\n#ifndef AUTOMATON_ALTS\n");
168 printf ("#define AUTOMATON_ALTS 0\n");
169 printf ("#endif\n\n");
170 printf ("\n#ifndef AUTOMATON_STATE_ALTS\n");
171 printf ("#define AUTOMATON_STATE_ALTS 0\n");
172 printf ("#endif\n\n");
173 printf ("#ifndef CPU_UNITS_QUERY\n");
174 printf ("#define CPU_UNITS_QUERY 0\n");
175 printf ("#endif\n\n");
176 /* Interface itself: */
177 printf ("extern int max_dfa_issue_rate;\n\n");
178 printf ("/* The following macro value is calculated from the\n");
179 printf (" automaton based pipeline description and is equal to\n");
180 printf (" maximal number of all insns described in constructions\n");
181 printf (" `define_insn_reservation' which can be issued on the\n");
182 printf (" same processor cycle. */\n");
183 printf ("#define MAX_DFA_ISSUE_RATE max_dfa_issue_rate\n\n");
184 printf ("/* Insn latency time defined in define_insn_reservation. */\n");
185 printf ("extern int insn_default_latency (rtx);\n\n");
186 printf ("/* Return nonzero if there is a bypass for given insn\n");
187 printf (" which is a data producer. */\n");
188 printf ("extern int bypass_p (rtx);\n\n");
189 printf ("/* Insn latency time on data consumed by the 2nd insn.\n");
190 printf (" Use the function if bypass_p returns nonzero for\n");
191 printf (" the 1st insn. */\n");
192 printf ("extern int insn_latency (rtx, rtx);\n\n");
193 printf ("\n#if AUTOMATON_ALTS\n");
194 printf ("/* The following function returns number of alternative\n");
195 printf (" reservations of given insn. It may be used for better\n");
196 printf (" insns scheduling heuristics. */\n");
197 printf ("extern int insn_alts (rtx);\n\n");
198 printf ("#endif\n\n");
199 printf ("/* Maximal possible number of insns waiting results being\n");
200 printf (" produced by insns whose execution is not finished. */\n");
201 printf ("extern int max_insn_queue_index;\n\n");
202 printf ("/* Pointer to data describing current state of DFA. */\n");
203 printf ("typedef void *state_t;\n\n");
204 printf ("/* Size of the data in bytes. */\n");
205 printf ("extern int state_size (void);\n\n");
206 printf ("/* Initiate given DFA state, i.e. Set up the state\n");
207 printf (" as all functional units were not reserved. */\n");
208 printf ("extern void state_reset (state_t);\n");
209 printf ("/* The following function returns negative value if given\n");
210 printf (" insn can be issued in processor state described by given\n");
211 printf (" DFA state. In this case, the DFA state is changed to\n");
212 printf (" reflect the current and future reservations by given\n");
213 printf (" insn. Otherwise the function returns minimal time\n");
214 printf (" delay to issue the insn. This delay may be zero\n");
215 printf (" for superscalar or VLIW processors. If the second\n");
216 printf (" parameter is NULL the function changes given DFA state\n");
217 printf (" as new processor cycle started. */\n");
218 printf ("extern int state_transition (state_t, rtx);\n");
219 printf ("\n#if AUTOMATON_STATE_ALTS\n");
220 printf ("/* The following function returns number of possible\n");
221 printf (" alternative reservations of given insn in given\n");
222 printf (" DFA state. It may be used for better insns scheduling\n");
223 printf (" heuristics. By default the function is defined if\n");
224 printf (" macro AUTOMATON_STATE_ALTS is defined because its\n");
225 printf (" implementation may require much memory. */\n");
226 printf ("extern int state_alts (state_t, rtx);\n");
227 printf ("#endif\n\n");
228 printf ("extern int min_issue_delay (state_t, rtx);\n");
229 printf ("/* The following function returns nonzero if no one insn\n");
230 printf (" can be issued in current DFA state. */\n");
231 printf ("extern int state_dead_lock_p (state_t);\n");
232 printf ("/* The function returns minimal delay of issue of the 2nd\n");
233 printf (" insn after issuing the 1st insn in given DFA state.\n");
234 printf (" The 1st insn should be issued in given state (i.e.\n");
235 printf (" state_transition should return negative value for\n");
236 printf (" the insn and the state). Data dependencies between\n");
237 printf (" the insns are ignored by the function. */\n");
238 printf
239 ("extern int min_insn_conflict_delay (state_t, rtx, rtx);\n");
240 printf ("/* The following function outputs reservations for given\n");
241 printf (" insn as they are described in the corresponding\n");
242 printf (" define_insn_reservation. */\n");
243 printf ("extern void print_reservation (FILE *, rtx);\n");
244 printf ("\n#if CPU_UNITS_QUERY\n");
245 printf ("/* The following function returns code of functional unit\n");
246 printf (" with given name (see define_cpu_unit). */\n");
247 printf ("extern int get_cpu_unit_code (const char *);\n");
248 printf ("/* The following function returns nonzero if functional\n");
249 printf (" unit with given code is currently reserved in given\n");
250 printf (" DFA state. */\n");
251 printf ("extern int cpu_unit_reservation_p (state_t, int);\n");
252 printf ("#endif\n\n");
253 printf ("/* Clean insn code cache. It should be called if there\n");
254 printf (" is a chance that condition value in a\n");
255 printf (" define_insn_reservation will be changed after\n");
256 printf (" last call of dfa_start. */\n");
257 printf ("extern void dfa_clean_insn_cache (void);\n\n");
258 printf ("/* Initiate and finish work with DFA. They should be\n");
259 printf (" called as the first and the last interface\n");
260 printf (" functions. */\n");
261 printf ("extern void dfa_start (void);\n");
262 printf ("extern void dfa_finish (void);\n");
263 }
264 else
265 {
266 /* Otherwise we do no scheduling, but we need these typedefs
267 in order to avoid uglifying other code with more ifdefs. */
268 printf ("typedef void *state_t;\n\n");
269 }
270
271 /* Output flag masks for use by reorg.
272
273 Flags are used to hold branch direction and prediction information
274 for use by eligible_for_... */
275 printf("\n#define ATTR_FLAG_forward\t0x1\n");
276 printf("#define ATTR_FLAG_backward\t0x2\n");
277 printf("#define ATTR_FLAG_likely\t0x4\n");
278 printf("#define ATTR_FLAG_very_likely\t0x8\n");
279 printf("#define ATTR_FLAG_unlikely\t0x10\n");
280 printf("#define ATTR_FLAG_very_unlikely\t0x20\n");
281
282 puts("\n#endif /* GCC_INSN_ATTR_H */");
283
284 if (ferror (stdout) || fflush (stdout) || fclose (stdout))
285 return FATAL_EXIT_CODE;
286
287 return SUCCESS_EXIT_CODE;
288 }
289
290 /* Define this so we can link with print-rtl.o to get debug_rtx function. */
291 const char *
get_insn_name(int code ATTRIBUTE_UNUSED)292 get_insn_name (int code ATTRIBUTE_UNUSED)
293 {
294 return NULL;
295 }
296