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8b198102 | 1 | ! Implementation of the IEEE_EXCEPTIONS standard intrinsic module |
83ffe9cd | 2 | ! Copyright (C) 2013-2023 Free Software Foundation, Inc. |
8b198102 FXC |
3 | ! Contributed by Francois-Xavier Coudert <fxcoudert@gcc.gnu.org> |
4 | ! | |
5 | ! This file is part of the GNU Fortran runtime library (libgfortran). | |
6 | ! | |
7 | ! Libgfortran is free software; you can redistribute it and/or | |
8 | ! modify it under the terms of the GNU General Public | |
9 | ! License as published by the Free Software Foundation; either | |
10 | ! version 3 of the License, or (at your option) any later version. | |
11 | ! | |
12 | ! Libgfortran is distributed in the hope that it will be useful, | |
13 | ! but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | ! MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | ! GNU General Public License for more details. | |
16 | ! | |
17 | ! Under Section 7 of GPL version 3, you are granted additional | |
18 | ! permissions described in the GCC Runtime Library Exception, version | |
19 | ! 3.1, as published by the Free Software Foundation. | |
20 | ! | |
21 | ! You should have received a copy of the GNU General Public License and | |
22 | ! a copy of the GCC Runtime Library Exception along with this program; | |
23 | ! see the files COPYING3 and COPYING.RUNTIME respectively. If not, see | |
24 | ! <http://www.gnu.org/licenses/>. */ | |
25 | ||
26 | #include "config.h" | |
27 | #include "kinds.inc" | |
28 | #include "c99_protos.inc" | |
29 | #include "fpu-target.inc" | |
30 | ||
31 | module IEEE_EXCEPTIONS | |
32 | ||
33 | implicit none | |
34 | private | |
35 | ||
36 | ! Derived types and named constants | |
37 | ||
38 | type, public :: IEEE_FLAG_TYPE | |
39 | private | |
40 | integer :: hidden | |
41 | end type | |
42 | ||
43 | type(IEEE_FLAG_TYPE), parameter, public :: & | |
44 | IEEE_INVALID = IEEE_FLAG_TYPE(GFC_FPE_INVALID), & | |
45 | IEEE_OVERFLOW = IEEE_FLAG_TYPE(GFC_FPE_OVERFLOW), & | |
46 | IEEE_DIVIDE_BY_ZERO = IEEE_FLAG_TYPE(GFC_FPE_ZERO), & | |
47 | IEEE_UNDERFLOW = IEEE_FLAG_TYPE(GFC_FPE_UNDERFLOW), & | |
48 | IEEE_INEXACT = IEEE_FLAG_TYPE(GFC_FPE_INEXACT) | |
49 | ||
50 | type(IEEE_FLAG_TYPE), parameter, public :: & | |
51 | IEEE_USUAL(3) = [ IEEE_OVERFLOW, IEEE_DIVIDE_BY_ZERO, IEEE_INVALID ], & | |
52 | IEEE_ALL(5) = [ IEEE_USUAL, IEEE_UNDERFLOW, IEEE_INEXACT ] | |
53 | ||
54 | type, public :: IEEE_STATUS_TYPE | |
55 | private | |
56 | character(len=GFC_FPE_STATE_BUFFER_SIZE) :: hidden | |
57 | end type | |
58 | ||
de40fab2 FXC |
59 | type, public :: IEEE_MODES_TYPE |
60 | private | |
61 | integer :: rounding | |
62 | integer :: underflow | |
63 | integer :: halting | |
64 | end type | |
65 | ||
8b198102 | 66 | interface IEEE_SUPPORT_FLAG |
22a49988 FXC |
67 | module procedure IEEE_SUPPORT_FLAG_4, & |
68 | IEEE_SUPPORT_FLAG_8, & | |
69 | #ifdef HAVE_GFC_REAL_10 | |
70 | IEEE_SUPPORT_FLAG_10, & | |
71 | #endif | |
72 | #ifdef HAVE_GFC_REAL_16 | |
73 | IEEE_SUPPORT_FLAG_16, & | |
74 | #endif | |
75 | IEEE_SUPPORT_FLAG_NOARG | |
8b198102 FXC |
76 | end interface IEEE_SUPPORT_FLAG |
77 | ||
78 | public :: IEEE_SUPPORT_FLAG, IEEE_SUPPORT_HALTING | |
79 | public :: IEEE_SET_HALTING_MODE, IEEE_GET_HALTING_MODE | |
80 | public :: IEEE_SET_FLAG, IEEE_GET_FLAG | |
81 | public :: IEEE_SET_STATUS, IEEE_GET_STATUS | |
de40fab2 | 82 | public :: IEEE_SET_MODES, IEEE_GET_MODES |
8b198102 FXC |
83 | |
84 | contains | |
85 | ||
de40fab2 FXC |
86 | ! Fortran 2018: Saving and restoring floating-point modes |
87 | ! (rounding modes, underflow mode, and halting mode) | |
88 | ! | |
89 | ! For now, we only have one rounding mode for all kinds. | |
90 | ! Some targets could optimize getting/setting all modes at once, but for now | |
91 | ! we make three calls. This code must be kept in sync with: | |
92 | ! - IEEE_{GET,SET}_ROUNDING_MODE | |
93 | ! - IEEE_{GET,SET}_UNDERFLOW_MODE | |
94 | ! - IEEE_{GET,SET}_HALTING_MODE | |
95 | ||
96 | subroutine IEEE_GET_MODES (MODES) | |
97 | implicit none | |
98 | type(IEEE_MODES_TYPE), intent(out) :: MODES | |
99 | ||
100 | interface | |
101 | integer function helper_rounding() & | |
102 | bind(c, name="_gfortrani_get_fpu_rounding_mode") | |
103 | end function | |
104 | integer function helper_underflow() & | |
105 | bind(c, name="_gfortrani_get_fpu_underflow_mode") | |
106 | end function | |
107 | pure integer function helper_halting() & | |
108 | bind(c, name="_gfortrani_get_fpu_trap_exceptions") | |
109 | end function | |
110 | end interface | |
111 | ||
112 | MODES%rounding = helper_rounding() | |
113 | MODES%underflow = helper_underflow() | |
114 | MODES%halting = helper_halting() | |
115 | end subroutine | |
116 | ||
117 | subroutine IEEE_SET_MODES (MODES) | |
118 | implicit none | |
119 | type(IEEE_MODES_TYPE), intent(in) :: MODES | |
120 | ||
121 | interface | |
122 | subroutine helper_rounding(val) & | |
123 | bind(c, name="_gfortrani_set_fpu_rounding_mode") | |
124 | integer, value :: val | |
125 | end subroutine | |
126 | subroutine helper_underflow(val) & | |
127 | bind(c, name="_gfortrani_set_fpu_underflow_mode") | |
128 | integer, value :: val | |
129 | end subroutine | |
130 | pure subroutine helper_halting(trap, notrap) & | |
131 | bind(c, name="_gfortrani_set_fpu_trap_exceptions") | |
132 | integer, intent(in), value :: trap, notrap | |
133 | end subroutine | |
134 | end interface | |
135 | ||
136 | call helper_rounding(MODES%rounding) | |
137 | call helper_underflow(MODES%underflow) | |
138 | call helper_halting(MODES%halting, NOT(MODES%halting)) | |
139 | end subroutine | |
140 | ||
8b198102 FXC |
141 | ! Saving and restoring floating-point status |
142 | ||
143 | subroutine IEEE_GET_STATUS (STATUS_VALUE) | |
144 | implicit none | |
145 | type(IEEE_STATUS_TYPE), intent(out) :: STATUS_VALUE | |
146 | ||
147 | interface | |
148 | subroutine helper(ptr) & | |
149 | bind(c, name="_gfortrani_get_fpu_state") | |
150 | use, intrinsic :: iso_c_binding, only : c_char | |
151 | character(kind=c_char) :: ptr(*) | |
152 | end subroutine | |
153 | end interface | |
154 | ||
155 | call helper(STATUS_VALUE%hidden) | |
156 | end subroutine | |
157 | ||
158 | subroutine IEEE_SET_STATUS (STATUS_VALUE) | |
159 | implicit none | |
160 | type(IEEE_STATUS_TYPE), intent(in) :: STATUS_VALUE | |
161 | ||
162 | interface | |
163 | subroutine helper(ptr) & | |
164 | bind(c, name="_gfortrani_set_fpu_state") | |
165 | use, intrinsic :: iso_c_binding, only : c_char | |
166 | character(kind=c_char) :: ptr(*) | |
167 | end subroutine | |
168 | end interface | |
169 | ||
170 | call helper(STATUS_VALUE%hidden) | |
171 | end subroutine | |
172 | ||
173 | ! Getting and setting flags | |
174 | ||
175 | elemental subroutine IEEE_GET_FLAG (FLAG, FLAG_VALUE) | |
176 | implicit none | |
177 | type(IEEE_FLAG_TYPE), intent(in) :: FLAG | |
178 | logical, intent(out) :: FLAG_VALUE | |
179 | ||
180 | interface | |
181 | pure integer function helper() & | |
182 | bind(c, name="_gfortrani_get_fpu_except_flags") | |
183 | end function | |
184 | end interface | |
185 | ||
186 | FLAG_VALUE = (IAND(helper(), FLAG%hidden) /= 0) | |
187 | end subroutine | |
188 | ||
189 | elemental subroutine IEEE_SET_FLAG (FLAG, FLAG_VALUE) | |
190 | implicit none | |
191 | type(IEEE_FLAG_TYPE), intent(in) :: FLAG | |
192 | logical, intent(in) :: FLAG_VALUE | |
193 | ||
194 | interface | |
195 | pure subroutine helper(set, clear) & | |
196 | bind(c, name="_gfortrani_set_fpu_except_flags") | |
197 | integer, intent(in), value :: set, clear | |
198 | end subroutine | |
199 | end interface | |
200 | ||
201 | if (FLAG_VALUE) then | |
202 | call helper(FLAG%hidden, 0) | |
203 | else | |
204 | call helper(0, FLAG%hidden) | |
205 | end if | |
206 | end subroutine | |
207 | ||
208 | ! Querying and changing the halting mode | |
209 | ||
210 | elemental subroutine IEEE_GET_HALTING_MODE (FLAG, HALTING) | |
211 | implicit none | |
212 | type(IEEE_FLAG_TYPE), intent(in) :: FLAG | |
213 | logical, intent(out) :: HALTING | |
214 | ||
215 | interface | |
216 | pure integer function helper() & | |
217 | bind(c, name="_gfortrani_get_fpu_trap_exceptions") | |
218 | end function | |
219 | end interface | |
220 | ||
221 | HALTING = (IAND(helper(), FLAG%hidden) /= 0) | |
222 | end subroutine | |
223 | ||
224 | elemental subroutine IEEE_SET_HALTING_MODE (FLAG, HALTING) | |
225 | implicit none | |
226 | type(IEEE_FLAG_TYPE), intent(in) :: FLAG | |
227 | logical, intent(in) :: HALTING | |
228 | ||
229 | interface | |
230 | pure subroutine helper(trap, notrap) & | |
231 | bind(c, name="_gfortrani_set_fpu_trap_exceptions") | |
232 | integer, intent(in), value :: trap, notrap | |
233 | end subroutine | |
234 | end interface | |
235 | ||
236 | if (HALTING) then | |
237 | call helper(FLAG%hidden, 0) | |
238 | else | |
239 | call helper(0, FLAG%hidden) | |
240 | end if | |
241 | end subroutine | |
242 | ||
243 | ! Querying support | |
244 | ||
245 | pure logical function IEEE_SUPPORT_HALTING (FLAG) | |
246 | implicit none | |
247 | type(IEEE_FLAG_TYPE), intent(in) :: FLAG | |
248 | ||
249 | interface | |
250 | pure integer function helper(flag) & | |
251 | bind(c, name="_gfortrani_support_fpu_trap") | |
252 | integer, intent(in), value :: flag | |
253 | end function | |
254 | end interface | |
255 | ||
256 | IEEE_SUPPORT_HALTING = (helper(FLAG%hidden) /= 0) | |
257 | end function | |
258 | ||
259 | pure logical function IEEE_SUPPORT_FLAG_NOARG (FLAG) | |
260 | implicit none | |
261 | type(IEEE_FLAG_TYPE), intent(in) :: FLAG | |
262 | ||
263 | interface | |
264 | pure integer function helper(flag) & | |
265 | bind(c, name="_gfortrani_support_fpu_flag") | |
266 | integer, intent(in), value :: flag | |
267 | end function | |
268 | end interface | |
269 | ||
270 | IEEE_SUPPORT_FLAG_NOARG = (helper(FLAG%hidden) /= 0) | |
271 | end function | |
272 | ||
273 | pure logical function IEEE_SUPPORT_FLAG_4 (FLAG, X) result(res) | |
274 | implicit none | |
275 | type(IEEE_FLAG_TYPE), intent(in) :: FLAG | |
276 | real(kind=4), intent(in) :: X | |
277 | res = IEEE_SUPPORT_FLAG_NOARG(FLAG) | |
278 | end function | |
279 | ||
280 | pure logical function IEEE_SUPPORT_FLAG_8 (FLAG, X) result(res) | |
281 | implicit none | |
282 | type(IEEE_FLAG_TYPE), intent(in) :: FLAG | |
283 | real(kind=8), intent(in) :: X | |
284 | res = IEEE_SUPPORT_FLAG_NOARG(FLAG) | |
285 | end function | |
286 | ||
22a49988 FXC |
287 | #ifdef HAVE_GFC_REAL_10 |
288 | pure logical function IEEE_SUPPORT_FLAG_10 (FLAG, X) result(res) | |
289 | implicit none | |
290 | type(IEEE_FLAG_TYPE), intent(in) :: FLAG | |
291 | real(kind=10), intent(in) :: X | |
292 | res = IEEE_SUPPORT_FLAG_NOARG(FLAG) | |
293 | end function | |
294 | #endif | |
295 | ||
296 | #ifdef HAVE_GFC_REAL_16 | |
297 | pure logical function IEEE_SUPPORT_FLAG_16 (FLAG, X) result(res) | |
298 | implicit none | |
299 | type(IEEE_FLAG_TYPE), intent(in) :: FLAG | |
300 | real(kind=16), intent(in) :: X | |
301 | res = IEEE_SUPPORT_FLAG_NOARG(FLAG) | |
302 | end function | |
303 | #endif | |
304 | ||
8b198102 | 305 | end module IEEE_EXCEPTIONS |