1 /*
2 (c) Copyright 2017 Michael R. Neilly
3 All rights reserved.
4
5 Redistribution and use in source and binary forms, with or without
6 modification, are permitted provided that the following conditions
7 are met:
8
9 * Redistributions of source code must retain the above copyright
10 notice, this list of conditions and the following disclaimer.
11
12 * Redistributions in binary form must reproduce the above copyright
13 notice, this list of conditions and the following disclaimer in the
14 documentation and/or other materials provided with the distribution.
15
16 * Neither the names of the copyright holders nor the names of their
17 contributors may be used to endorse or promote products derived from
18 this software without specific prior written permission.
19
20 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
21 "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
22 LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
23 FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
24 COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
25 INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
26 BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
27 LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
28 CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
30 ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
31 POSSIBILITY OF SUCH DAMAGE.
32 */
33
34 #include <fenv.h>
35
36 /* This implementation is intended to comply with the following
37 * specification:
38 *
39 * http://pubs.opengroup.org/onlinepubs/009695399/functions/fegetenv.html
40 * Referred to as 'fegetenv.html below.
41 *
42 * "The fegetenv() function shall attempt to store the current
43 * floating-point environment in the object pointed to by envp.
44 *
45 * The fesetenv() function shall attempt to establish the
46 * floating-point environment represented by the object pointed to by
47 * envp. The argument envp shall point to an object set by a call to
48 * fegetenv() or feholdexcept(), or equal a floating-point environment
49 * macro. The fesetenv() function does not raise floating-point
50 * exceptions, but only installs the state of the floating-point
51 * status flags represented through its argument."
52 */
53
54 #if __riscv_flen
55
fesetenv(const fenv_t * envp)56 int fesetenv(const fenv_t *envp)
57 {
58
59 /* Set environment (FCSR) */
60
61 fenv_t fcsr = *envp;
62 __asm__ volatile("fscsr %0" : : "r"(fcsr));
63
64 /* Per 'fegetenv.html:
65 *
66 * "If the environment was successfully established, fesetenv()
67 * shall return zero. Otherwise, it shall return a non-zero value.
68 */
69
70 return 0;
71 }
72 #else
73 #include "../../fenv/fesetenv.c"
74 #endif
75
