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677f3fa8 | 1 | /* Common hooks for IBM RS/6000. |
a5544970 | 2 | Copyright (C) 1991-2019 Free Software Foundation, Inc. |
677f3fa8 JM |
3 | |
4 | This file is part of GCC. | |
5 | ||
6 | GCC is free software; you can redistribute it and/or modify it | |
7 | under the terms of the GNU General Public License as published | |
8 | by the Free Software Foundation; either version 3, or (at your | |
9 | option) any later version. | |
10 | ||
11 | GCC is distributed in the hope that it will be useful, but WITHOUT | |
12 | ANY WARRANTY; without even the implied warranty of MERCHANTABILITY | |
13 | or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public | |
14 | License for more details. | |
15 | ||
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/>. */ | |
19 | ||
20 | #include "config.h" | |
21 | #include "system.h" | |
22 | #include "coretypes.h" | |
23 | #include "diagnostic-core.h" | |
24 | #include "tm.h" | |
25 | #include "common/common-target.h" | |
26 | #include "common/common-target-def.h" | |
27 | #include "opts.h" | |
28 | #include "flags.h" | |
29 | ||
30 | /* Implement TARGET_OPTION_OPTIMIZATION_TABLE. */ | |
31 | static const struct default_options rs6000_option_optimization_table[] = | |
32 | { | |
b18081df SB |
33 | /* Split multi-word types early. */ |
34 | { OPT_LEVELS_ALL, OPT_fsplit_wide_types_early, NULL, 1 }, | |
35f4cbd4 PH |
35 | /* Enable -fsched-pressure for first pass instruction scheduling. */ |
36 | { OPT_LEVELS_1_PLUS, OPT_fsched_pressure, NULL, 1 }, | |
48f65795 JG |
37 | /* Enable -munroll-only-small-loops with -funroll-loops to unroll small |
38 | loops at -O2 and above by default. */ | |
39 | { OPT_LEVELS_2_PLUS_SPEED_ONLY, OPT_funroll_loops, NULL, 1 }, | |
40 | { OPT_LEVELS_2_PLUS_SPEED_ONLY, OPT_munroll_only_small_loops, NULL, 1 }, | |
41 | /* -fweb and -frename-registers are useless in general for rs6000, | |
42 | turn them off. */ | |
43 | { OPT_LEVELS_ALL, OPT_fweb, NULL, 0 }, | |
44 | { OPT_LEVELS_ALL, OPT_frename_registers, NULL, 0 }, | |
677f3fa8 JM |
45 | { OPT_LEVELS_NONE, 0, NULL, 0 } |
46 | }; | |
47 | ||
48 | /* Implement TARGET_OPTION_INIT_STRUCT. */ | |
49 | ||
50 | static void | |
51 | rs6000_option_init_struct (struct gcc_options *opts) | |
52 | { | |
53 | if (DEFAULT_ABI == ABI_DARWIN) | |
54 | /* The Darwin libraries never set errno, so we might as well | |
55 | avoid calling them when that's the only reason we would. */ | |
56 | opts->x_flag_errno_math = 0; | |
57 | ||
58 | /* Enable section anchors by default. */ | |
59 | if (!TARGET_MACHO) | |
60 | opts->x_flag_section_anchors = 1; | |
0359465c SB |
61 | |
62 | /* By default, always emit DWARF-2 unwind info. This allows debugging | |
63 | without maintaining a stack frame back-chain. It also allows the | |
64 | debugger to find out where on-entry register values are stored at any | |
65 | point in a function, without having to analyze the executable code (which | |
66 | isn't even possible to do in the general case). */ | |
67 | #ifdef OBJECT_FORMAT_ELF | |
68 | opts->x_flag_asynchronous_unwind_tables = 1; | |
69 | #endif | |
677f3fa8 JM |
70 | } |
71 | ||
4c77620d JM |
72 | /* Implement TARGET_OPTION_DEFAULT_PARAMS. */ |
73 | ||
74 | static void | |
75 | rs6000_option_default_params (void) | |
76 | { | |
77 | /* Double growth factor to counter reduced min jump length. */ | |
028d4092 | 78 | param_max_grow_copy_bb_insns = 16; |
4c77620d JM |
79 | } |
80 | ||
677f3fa8 JM |
81 | /* If not otherwise specified by a target, make 'long double' equivalent to |
82 | 'double'. */ | |
83 | ||
84 | #ifndef RS6000_DEFAULT_LONG_DOUBLE_SIZE | |
85 | #define RS6000_DEFAULT_LONG_DOUBLE_SIZE 64 | |
86 | #endif | |
87 | ||
88 | /* Implement TARGET_HANDLE_OPTION. */ | |
89 | ||
90 | static bool | |
91 | rs6000_handle_option (struct gcc_options *opts, struct gcc_options *opts_set, | |
92 | const struct cl_decoded_option *decoded, | |
93 | location_t loc) | |
94 | { | |
677f3fa8 JM |
95 | char *p, *q; |
96 | size_t code = decoded->opt_index; | |
97 | const char *arg = decoded->arg; | |
98 | int value = decoded->value; | |
99 | ||
100 | switch (code) | |
101 | { | |
677f3fa8 | 102 | case OPT_mfull_toc: |
4d967549 | 103 | opts->x_rs6000_isa_flags &= ~OPTION_MASK_MINIMAL_TOC; |
677f3fa8 JM |
104 | opts->x_TARGET_NO_FP_IN_TOC = 0; |
105 | opts->x_TARGET_NO_SUM_IN_TOC = 0; | |
4d967549 | 106 | opts_set->x_rs6000_isa_flags |= OPTION_MASK_MINIMAL_TOC; |
677f3fa8 JM |
107 | #ifdef TARGET_USES_SYSV4_OPT |
108 | /* Note, V.4 no longer uses a normal TOC, so make -mfull-toc, be | |
109 | just the same as -mminimal-toc. */ | |
4d967549 MM |
110 | opts->x_rs6000_isa_flags |= OPTION_MASK_MINIMAL_TOC; |
111 | opts_set->x_rs6000_isa_flags |= OPTION_MASK_MINIMAL_TOC; | |
677f3fa8 JM |
112 | #endif |
113 | break; | |
114 | ||
115 | #ifdef TARGET_USES_SYSV4_OPT | |
116 | case OPT_mtoc: | |
117 | /* Make -mtoc behave like -mminimal-toc. */ | |
4d967549 MM |
118 | opts->x_rs6000_isa_flags |= OPTION_MASK_MINIMAL_TOC; |
119 | opts_set->x_rs6000_isa_flags |= OPTION_MASK_MINIMAL_TOC; | |
677f3fa8 JM |
120 | break; |
121 | #endif | |
122 | ||
123 | #ifdef TARGET_USES_AIX64_OPT | |
124 | case OPT_maix64: | |
125 | #else | |
126 | case OPT_m64: | |
127 | #endif | |
4d967549 MM |
128 | opts->x_rs6000_isa_flags |= OPTION_MASK_POWERPC64; |
129 | opts->x_rs6000_isa_flags |= (~opts_set->x_rs6000_isa_flags | |
130 | & OPTION_MASK_PPC_GFXOPT); | |
131 | opts_set->x_rs6000_isa_flags |= OPTION_MASK_POWERPC64; | |
677f3fa8 JM |
132 | break; |
133 | ||
134 | #ifdef TARGET_USES_AIX64_OPT | |
135 | case OPT_maix32: | |
136 | #else | |
137 | case OPT_m32: | |
138 | #endif | |
4d967549 MM |
139 | opts->x_rs6000_isa_flags &= ~OPTION_MASK_POWERPC64; |
140 | opts_set->x_rs6000_isa_flags |= OPTION_MASK_POWERPC64; | |
677f3fa8 JM |
141 | break; |
142 | ||
143 | case OPT_mminimal_toc: | |
144 | if (value == 1) | |
145 | { | |
146 | opts->x_TARGET_NO_FP_IN_TOC = 0; | |
147 | opts->x_TARGET_NO_SUM_IN_TOC = 0; | |
148 | } | |
149 | break; | |
150 | ||
677f3fa8 JM |
151 | case OPT_mpowerpc_gpopt: |
152 | case OPT_mpowerpc_gfxopt: | |
677f3fa8 JM |
153 | break; |
154 | ||
155 | case OPT_mdebug_: | |
156 | p = ASTRDUP (arg); | |
157 | opts->x_rs6000_debug = 0; | |
158 | ||
159 | while ((q = strtok (p, ",")) != NULL) | |
160 | { | |
161 | unsigned mask = 0; | |
162 | bool invert; | |
163 | ||
164 | p = NULL; | |
165 | if (*q == '!') | |
166 | { | |
167 | invert = true; | |
168 | q++; | |
169 | } | |
170 | else | |
171 | invert = false; | |
172 | ||
173 | if (! strcmp (q, "all")) | |
174 | mask = MASK_DEBUG_ALL; | |
175 | else if (! strcmp (q, "stack")) | |
176 | mask = MASK_DEBUG_STACK; | |
177 | else if (! strcmp (q, "arg")) | |
178 | mask = MASK_DEBUG_ARG; | |
179 | else if (! strcmp (q, "reg")) | |
180 | mask = MASK_DEBUG_REG; | |
181 | else if (! strcmp (q, "addr")) | |
182 | mask = MASK_DEBUG_ADDR; | |
183 | else if (! strcmp (q, "cost")) | |
184 | mask = MASK_DEBUG_COST; | |
185 | else if (! strcmp (q, "target")) | |
186 | mask = MASK_DEBUG_TARGET; | |
7fa14a01 MM |
187 | else if (! strcmp (q, "builtin")) |
188 | mask = MASK_DEBUG_BUILTIN; | |
677f3fa8 | 189 | else |
a3f9f006 | 190 | error_at (loc, "unknown %<-mdebug-%s%> switch", q); |
677f3fa8 JM |
191 | |
192 | if (invert) | |
193 | opts->x_rs6000_debug &= ~mask; | |
194 | else | |
195 | opts->x_rs6000_debug |= mask; | |
196 | } | |
197 | break; | |
198 | ||
199 | #ifdef TARGET_USES_SYSV4_OPT | |
200 | case OPT_mrelocatable: | |
201 | if (value == 1) | |
202 | { | |
4d967549 MM |
203 | opts->x_rs6000_isa_flags |= OPTION_MASK_MINIMAL_TOC; |
204 | opts_set->x_rs6000_isa_flags |= OPTION_MASK_MINIMAL_TOC; | |
677f3fa8 JM |
205 | opts->x_TARGET_NO_FP_IN_TOC = 1; |
206 | } | |
207 | break; | |
208 | ||
209 | case OPT_mrelocatable_lib: | |
210 | if (value == 1) | |
211 | { | |
4d967549 MM |
212 | opts->x_rs6000_isa_flags |= (OPTION_MASK_RELOCATABLE |
213 | | OPTION_MASK_MINIMAL_TOC); | |
214 | opts_set->x_rs6000_isa_flags |= (OPTION_MASK_RELOCATABLE | |
215 | | OPTION_MASK_MINIMAL_TOC); | |
677f3fa8 JM |
216 | opts->x_TARGET_NO_FP_IN_TOC = 1; |
217 | } | |
218 | else | |
219 | { | |
4d967549 MM |
220 | opts->x_rs6000_isa_flags &= ~OPTION_MASK_RELOCATABLE; |
221 | opts_set->x_rs6000_isa_flags |= OPTION_MASK_RELOCATABLE; | |
677f3fa8 JM |
222 | } |
223 | break; | |
224 | #endif | |
225 | ||
677f3fa8 JM |
226 | case OPT_mlong_double_: |
227 | if (value != 64 && value != 128) | |
228 | { | |
a3f9f006 | 229 | error_at (loc, "unknown switch %<-mlong-double-%s%>", arg); |
677f3fa8 JM |
230 | opts->x_rs6000_long_double_type_size |
231 | = RS6000_DEFAULT_LONG_DOUBLE_SIZE; | |
232 | return false; | |
233 | } | |
234 | break; | |
235 | ||
677f3fa8 JM |
236 | case OPT_mrecip: |
237 | opts->x_rs6000_recip_name = (value) ? "default" : "none"; | |
238 | break; | |
239 | } | |
240 | return true; | |
241 | } | |
242 | ||
0f0fd745 AM |
243 | /* -fsplit-stack uses a field in the TCB, available with glibc-2.19. |
244 | We also allow 2.18 because alignment padding guarantees that the | |
245 | space is available there too. */ | |
246 | ||
247 | static bool | |
248 | rs6000_supports_split_stack (bool report, | |
249 | struct gcc_options *opts ATTRIBUTE_UNUSED) | |
250 | { | |
251 | #ifndef TARGET_GLIBC_MAJOR | |
252 | #define TARGET_GLIBC_MAJOR 0 | |
253 | #endif | |
254 | #ifndef TARGET_GLIBC_MINOR | |
255 | #define TARGET_GLIBC_MINOR 0 | |
256 | #endif | |
257 | /* Note: Can't test DEFAULT_ABI here, it isn't set until later. */ | |
258 | if (TARGET_GLIBC_MAJOR * 1000 + TARGET_GLIBC_MINOR >= 2018 | |
259 | && TARGET_64BIT | |
260 | && TARGET_ELF) | |
261 | return true; | |
262 | ||
263 | if (report) | |
264 | error ("%<-fsplit-stack%> currently only supported on PowerPC64 GNU/Linux with glibc-2.18 or later"); | |
265 | return false; | |
266 | } | |
267 | ||
677f3fa8 JM |
268 | #undef TARGET_HANDLE_OPTION |
269 | #define TARGET_HANDLE_OPTION rs6000_handle_option | |
270 | ||
271 | #undef TARGET_OPTION_INIT_STRUCT | |
272 | #define TARGET_OPTION_INIT_STRUCT rs6000_option_init_struct | |
273 | ||
4c77620d JM |
274 | #undef TARGET_OPTION_DEFAULT_PARAMS |
275 | #define TARGET_OPTION_DEFAULT_PARAMS rs6000_option_default_params | |
276 | ||
677f3fa8 JM |
277 | #undef TARGET_OPTION_OPTIMIZATION_TABLE |
278 | #define TARGET_OPTION_OPTIMIZATION_TABLE rs6000_option_optimization_table | |
279 | ||
0f0fd745 AM |
280 | #undef TARGET_SUPPORTS_SPLIT_STACK |
281 | #define TARGET_SUPPORTS_SPLIT_STACK rs6000_supports_split_stack | |
282 | ||
677f3fa8 | 283 | struct gcc_targetm_common targetm_common = TARGETM_COMMON_INITIALIZER; |