1 /* IA-32 floating point unit non-inline related functions.
2 Copyright (C) 2001-2010 Roberto Bagnara <bagnara@cs.unipr.it>
3 Copyright (C) 2010-2016 BUGSENG srl (http://bugseng.com)
4
5 This file is part of the Parma Polyhedra Library (PPL).
6
7 The PPL is free software; you can redistribute it and/or modify it
8 under the terms of the GNU General Public License as published by the
9 Free Software Foundation; either version 3 of the License, or (at your
10 option) any later version.
11
12 The PPL is distributed in the hope that it will be useful, but WITHOUT
13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
15 for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software Foundation,
19 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02111-1307, USA.
20
21 For the most up-to-date information see the Parma Polyhedra Library
22 site: http://bugseng.com/products/ppl/ . */
23
24 #include "ppl-config.h"
25
26 #if PPL_CAN_CONTROL_FPU && defined(PPL_FPMATH_MAY_USE_SSE) \
27 && defined(__i386__) \
28 && (defined(__GNUC__) || defined(__INTEL_COMPILER))
29
30 #include "fpu_defs.hh"
31 #include <csetjmp>
32 #include <csignal>
33 // This inclusion is to work around a bug present in some versions
34 // of GCC under mingw-w64.
35 // See http://www.cs.unipr.it/pipermail/ppl-devel/2011-February/017342.html
36 #include <cstddef>
37
38 namespace {
39
40 jmp_buf env;
41
42 void
illegal_instruction_catcher(int)43 illegal_instruction_catcher(int) {
44 longjmp(env, 1);
45 }
46
47 } // namespace
48
49 namespace Parma_Polyhedra_Library {
50
51 bool have_sse_unit = true;
52
53 void
detect_sse_unit()54 detect_sse_unit() {
55 void (*old)(int);
56 // Install our own signal handler for SIGILL.
57 old = signal(SIGILL, illegal_instruction_catcher);
58
59 if (setjmp(env)) {
60 // We will end up here if sse_get_control() raises SIGILL.
61 have_sse_unit = false;
62 }
63 else {
64 (void) sse_get_control();
65 // sse_get_control() did not raise SIGILL: we have an SSE unit.
66 have_sse_unit = true;
67 }
68
69 // Restore the previous signal handler for SIGILL.
70 signal(SIGILL, old);
71 }
72
73 } // namespace Parma_Polyhedra_Library
74
75 #endif // PPL_CAN_CONTROL_FPU && defined(PPL_FPMATH_MAY_USE_SSE)
76 // && defined(__i386__)
77 // && (defined(__GNUC__) || defined(__INTEL_COMPILER))
78