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1 | /* Private floating point rounding and exceptions handling. PowerPC version. | |
2 | Copyright (C) 2013-2019 Free Software Foundation, Inc. | |
3 | This file is part of the GNU C Library. | |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Lesser General Public | |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
9 | ||
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | Lesser General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Lesser General Public | |
16 | License along with the GNU C Library. If not, see | |
17 | <https://www.gnu.org/licenses/>. */ | |
18 | ||
19 | #ifndef POWERPC_FENV_PRIVATE_H | |
20 | #define POWERPC_FENV_PRIVATE_H 1 | |
21 | ||
22 | #include <fenv.h> | |
23 | #include <fenv_libc.h> | |
24 | #include <fpu_control.h> | |
25 | ||
26 | /* Mask for the exception enable bits. */ | |
27 | #define _FPU_ALL_TRAPS (_FPU_MASK_ZM | _FPU_MASK_OM | _FPU_MASK_UM \ | |
28 | | _FPU_MASK_XM | _FPU_MASK_IM) | |
29 | ||
30 | /* Mask the rounding mode bits. */ | |
31 | #define _FPU_MASK_RN 0xfffffffffffffffcLL | |
32 | ||
33 | /* Mask everything but the rounding modes and non-IEEE arithmetic flags. */ | |
34 | #define _FPU_MASK_NOT_RN_NI 0xffffffff00000807LL | |
35 | ||
36 | /* Mask restore rounding mode and exception enabled. */ | |
37 | #define _FPU_MASK_TRAPS_RN 0xffffffffffffff00LL | |
38 | ||
39 | /* Mask FP result flags, preserve fraction rounded/inexact bits. */ | |
40 | #define _FPU_MASK_FRAC_INEX_RET_CC 0xfffffffffff80fffLL | |
41 | ||
42 | static __always_inline void | |
43 | __libc_feholdbits_ppc (fenv_t *envp, unsigned long long mask, | |
44 | unsigned long long bits) | |
45 | { | |
46 | fenv_union_t old, new; | |
47 | ||
48 | old.fenv = *envp = fegetenv_register (); | |
49 | ||
50 | new.l = (old.l & mask) | bits; | |
51 | ||
52 | /* If the old env had any enabled exceptions, then mask SIGFPE in the | |
53 | MSR FE0/FE1 bits. This may allow the FPU to run faster because it | |
54 | always takes the default action and can not generate SIGFPE. */ | |
55 | if ((old.l & _FPU_ALL_TRAPS) != 0) | |
56 | (void) __fe_mask_env (); | |
57 | ||
58 | fesetenv_register (new.fenv); | |
59 | } | |
60 | ||
61 | static __always_inline void | |
62 | libc_feholdexcept_ppc (fenv_t *envp) | |
63 | { | |
64 | __libc_feholdbits_ppc (envp, _FPU_MASK_NOT_RN_NI, 0LL); | |
65 | } | |
66 | ||
67 | static __always_inline void | |
68 | libc_feholdexcept_setround_ppc (fenv_t *envp, int r) | |
69 | { | |
70 | __libc_feholdbits_ppc (envp, _FPU_MASK_NOT_RN_NI & _FPU_MASK_RN, r); | |
71 | } | |
72 | ||
73 | static __always_inline void | |
74 | libc_fesetround_ppc (int r) | |
75 | { | |
76 | __fesetround_inline (r); | |
77 | } | |
78 | ||
79 | static __always_inline int | |
80 | libc_fetestexcept_ppc (int e) | |
81 | { | |
82 | fenv_union_t u; | |
83 | u.fenv = fegetenv_register (); | |
84 | return u.l & e; | |
85 | } | |
86 | ||
87 | static __always_inline void | |
88 | libc_feholdsetround_ppc (fenv_t *e, int r) | |
89 | { | |
90 | __libc_feholdbits_ppc (e, _FPU_MASK_TRAPS_RN, r); | |
91 | } | |
92 | ||
93 | static __always_inline unsigned long long | |
94 | __libc_femergeenv_ppc (const fenv_t *envp, unsigned long long old_mask, | |
95 | unsigned long long new_mask) | |
96 | { | |
97 | fenv_union_t old, new; | |
98 | ||
99 | new.fenv = *envp; | |
100 | old.fenv = fegetenv_register (); | |
101 | ||
102 | /* Merge bits while masking unwanted bits from new and old env. */ | |
103 | new.l = (old.l & old_mask) | (new.l & new_mask); | |
104 | ||
105 | /* If the old env has no enabled exceptions and the new env has any enabled | |
106 | exceptions, then unmask SIGFPE in the MSR FE0/FE1 bits. This will put the | |
107 | hardware into "precise mode" and may cause the FPU to run slower on some | |
108 | hardware. */ | |
109 | if ((old.l & _FPU_ALL_TRAPS) == 0 && (new.l & _FPU_ALL_TRAPS) != 0) | |
110 | (void) __fe_nomask_env_priv (); | |
111 | ||
112 | /* If the old env had any enabled exceptions and the new env has no enabled | |
113 | exceptions, then mask SIGFPE in the MSR FE0/FE1 bits. This may allow the | |
114 | FPU to run faster because it always takes the default action and can not | |
115 | generate SIGFPE. */ | |
116 | if ((old.l & _FPU_ALL_TRAPS) != 0 && (new.l & _FPU_ALL_TRAPS) == 0) | |
117 | (void) __fe_mask_env (); | |
118 | ||
119 | /* Atomically enable and raise (if appropriate) exceptions set in `new'. */ | |
120 | fesetenv_register (new.fenv); | |
121 | ||
122 | return old.l; | |
123 | } | |
124 | ||
125 | static __always_inline void | |
126 | libc_fesetenv_ppc (const fenv_t *envp) | |
127 | { | |
128 | /* Replace the entire environment. */ | |
129 | __libc_femergeenv_ppc (envp, 0LL, -1LL); | |
130 | } | |
131 | ||
132 | static __always_inline void | |
133 | libc_feresetround_ppc (fenv_t *envp) | |
134 | { | |
135 | fenv_union_t new = { .fenv = *envp }; | |
136 | ||
137 | /* If the old env has no enabled exceptions and the new env has any enabled | |
138 | exceptions, then unmask SIGFPE in the MSR FE0/FE1 bits. This will put the | |
139 | hardware into "precise mode" and may cause the FPU to run slower on some | |
140 | hardware. */ | |
141 | if ((new.l & _FPU_ALL_TRAPS) != 0) | |
142 | (void) __fe_nomask_env_priv (); | |
143 | ||
144 | /* Atomically enable and raise (if appropriate) exceptions set in `new'. */ | |
145 | fesetenv_mode (new.fenv); | |
146 | } | |
147 | ||
148 | static __always_inline int | |
149 | libc_feupdateenv_test_ppc (fenv_t *envp, int ex) | |
150 | { | |
151 | return __libc_femergeenv_ppc (envp, _FPU_MASK_TRAPS_RN, | |
152 | _FPU_MASK_FRAC_INEX_RET_CC) & ex; | |
153 | } | |
154 | ||
155 | static __always_inline void | |
156 | libc_feupdateenv_ppc (fenv_t *e) | |
157 | { | |
158 | libc_feupdateenv_test_ppc (e, 0); | |
159 | } | |
160 | ||
161 | #define libc_feholdexceptf libc_feholdexcept_ppc | |
162 | #define libc_feholdexcept libc_feholdexcept_ppc | |
163 | #define libc_feholdexcept_setroundf libc_feholdexcept_setround_ppc | |
164 | #define libc_feholdexcept_setround libc_feholdexcept_setround_ppc | |
165 | #define libc_fetestexceptf libc_fetestexcept_ppc | |
166 | #define libc_fetestexcept libc_fetestexcept_ppc | |
167 | #define libc_fesetroundf libc_fesetround_ppc | |
168 | #define libc_fesetround libc_fesetround_ppc | |
169 | #define libc_fesetenvf libc_fesetenv_ppc | |
170 | #define libc_fesetenv libc_fesetenv_ppc | |
171 | #define libc_feupdateenv_testf libc_feupdateenv_test_ppc | |
172 | #define libc_feupdateenv_test libc_feupdateenv_test_ppc | |
173 | #define libc_feupdateenvf libc_feupdateenv_ppc | |
174 | #define libc_feupdateenv libc_feupdateenv_ppc | |
175 | #define libc_feholdsetroundf libc_feholdsetround_ppc | |
176 | #define libc_feholdsetround libc_feholdsetround_ppc | |
177 | #define libc_feresetroundf libc_feresetround_ppc | |
178 | #define libc_feresetround libc_feresetround_ppc | |
179 | ||
180 | ||
181 | /* We have support for rounding mode context. */ | |
182 | #define HAVE_RM_CTX 1 | |
183 | ||
184 | static __always_inline void | |
185 | libc_feholdsetround_ppc_ctx (struct rm_ctx *ctx, int r) | |
186 | { | |
187 | fenv_union_t old, new; | |
188 | ||
189 | old.fenv = fegetenv_status (); | |
190 | ||
191 | new.l = (old.l & ~(FPSCR_ENABLES_MASK|FPSCR_RN_MASK)) | r; | |
192 | ||
193 | ctx->env = old.fenv; | |
194 | if (__glibc_unlikely (new.l != old.l)) | |
195 | { | |
196 | if ((old.l & _FPU_ALL_TRAPS) != 0) | |
197 | (void) __fe_mask_env (); | |
198 | fesetenv_mode (new.fenv); | |
199 | ctx->updated_status = true; | |
200 | } | |
201 | else | |
202 | ctx->updated_status = false; | |
203 | } | |
204 | ||
205 | static __always_inline void | |
206 | libc_feholdsetround_noex_ppc_ctx (struct rm_ctx *ctx, int r) | |
207 | { | |
208 | fenv_union_t old, new; | |
209 | ||
210 | old.fenv = fegetenv_register (); | |
211 | ||
212 | new.l = (old.l & ~(FPSCR_ENABLES_MASK|FPSCR_RN_MASK)) | r; | |
213 | ||
214 | ctx->env = old.fenv; | |
215 | if (__glibc_unlikely (new.l != old.l)) | |
216 | { | |
217 | if ((old.l & _FPU_ALL_TRAPS) != 0) | |
218 | (void) __fe_mask_env (); | |
219 | fesetenv_register (new.fenv); | |
220 | ctx->updated_status = true; | |
221 | } | |
222 | else | |
223 | ctx->updated_status = false; | |
224 | } | |
225 | ||
226 | static __always_inline void | |
227 | libc_fesetenv_ppc_ctx (struct rm_ctx *ctx) | |
228 | { | |
229 | libc_fesetenv_ppc (&ctx->env); | |
230 | } | |
231 | ||
232 | static __always_inline void | |
233 | libc_feupdateenv_ppc_ctx (struct rm_ctx *ctx) | |
234 | { | |
235 | if (__glibc_unlikely (ctx->updated_status)) | |
236 | libc_feresetround_ppc (&ctx->env); | |
237 | } | |
238 | ||
239 | static __always_inline void | |
240 | libc_feresetround_ppc_ctx (struct rm_ctx *ctx) | |
241 | { | |
242 | if (__glibc_unlikely (ctx->updated_status)) | |
243 | libc_feresetround_ppc (&ctx->env); | |
244 | } | |
245 | ||
246 | #define libc_fesetenv_ctx libc_fesetenv_ppc_ctx | |
247 | #define libc_fesetenvf_ctx libc_fesetenv_ppc_ctx | |
248 | #define libc_fesetenvl_ctx libc_fesetenv_ppc_ctx | |
249 | #define libc_feholdsetround_ctx libc_feholdsetround_ppc_ctx | |
250 | #define libc_feholdsetroundf_ctx libc_feholdsetround_ppc_ctx | |
251 | #define libc_feholdsetroundl_ctx libc_feholdsetround_ppc_ctx | |
252 | #define libc_feholdsetround_noex_ctx libc_feholdsetround_noex_ppc_ctx | |
253 | #define libc_feholdsetround_noexf_ctx libc_feholdsetround_noex_ppc_ctx | |
254 | #define libc_feholdsetround_noexl_ctx libc_feholdsetround_noex_ppc_ctx | |
255 | #define libc_feresetround_ctx libc_feresetround_ppc_ctx | |
256 | #define libc_feresetroundf_ctx libc_feresetround_ppc_ctx | |
257 | #define libc_feresetroundl_ctx libc_feresetround_ppc_ctx | |
258 | #define libc_feupdateenv_ctx libc_feupdateenv_ppc_ctx | |
259 | #define libc_feupdateenvf_ctx libc_feupdateenv_ppc_ctx | |
260 | #define libc_feupdateenvl_ctx libc_feupdateenv_ppc_ctx | |
261 | ||
262 | #include_next <fenv_private.h> | |
263 | ||
264 | #endif |