1 files changed, 75 insertions, 0 deletions
diff --git a/src/fpu-ia32.cc b/src/fpu-ia32.cc
new file mode 100644
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--- /dev/null
+++ b/src/fpu-ia32.cc
@@ -0,0 +1,75 @@
+/* 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))