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/* IA-32 floating point unit non-inline related functions.
Copyright (C) 2001-2010 Roberto Bagnara <bagnara@cs.unipr.it>
Copyright (C) 2010-2011 BUGSENG srl (http://bugseng.com)
This file is part of the Parma Polyhedra Library (PPL).
The PPL is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 3 of the License, or (at your
option) any later version.
The PPL is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software Foundation,
Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02111-1307, USA.
For the most up-to-date information see the Parma Polyhedra Library
site: http://www.cs.unipr.it/ppl/ . */
#include <ppl-config.h>
#if PPL_CAN_CONTROL_FPU && defined(PPL_FPMATH_MAY_USE_SSE) \
&& defined(__i386__) \
&& (defined(__GNUC__) || defined(__INTEL_COMPILER))
#include "fpu.defs.hh"
#include <csetjmp>
#include <csignal>
// This inclusion is to work around a bug present in some versions
// of GCC under mingw-w64.
// See http://www.cs.unipr.it/pipermail/ppl-devel/2011-February/017342.html
#include <cstddef>
namespace {
jmp_buf env;
void
illegal_instruction_catcher(int) {
longjmp(env, 1);
}
} // namespace
namespace Parma_Polyhedra_Library {
bool have_sse_unit = true;
void
detect_sse_unit() {
void (*old)(int);
if (setjmp(env)) {
// We will end up here if sse_get_control() raises SIGILL.
have_sse_unit = false;
goto restore_sigill_handler;
}
// Install our own signal handler for SIGILL.
old = signal(SIGILL, illegal_instruction_catcher);
(void) sse_get_control();
// sse_get_control() did not raise SIGILL: we have an SSE unit.
have_sse_unit = true;
restore_sigill_handler:
// Restore the previous signal handler for SIGILL.
signal(SIGILL, old);
}
} // namespace Parma_Polyhedra_Library
#endif // PPL_CAN_CONTROL_FPU && defined(PPL_FPMATH_MAY_USE_SSE) && defined(__i386__) && (defined(__GNUC__) || defined(__INTEL_COMPILER))
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