[gcc] GCC 4.5.0=>4.5.1

gcc/libgfortran/config/fpu-387.h

Index: gcc/libgfortran/config/fpu-387.h
diff --git a/gcc/libgfortran/config/fpu-387.h b/gcc/libgfortran/config/fpu-387.h
index 573fabcac6dead395928394089ab11b82dc44333..5fe51b2d20959b4acaaacf608d286bf5e66db978 100644
--- a/gcc/libgfortran/config/fpu-387.h
+++ b/gcc/libgfortran/config/fpu-387.h
@@ -1,5 +1,5 @@
 /* FPU-related code for x86 and x86_64 processors.
-   Copyright 2005, 2007, 2009 Free Software Foundation, Inc.
+   Copyright 2005, 2007, 2009, 2010 Free Software Foundation, Inc.
    Contributed by Francois-Xavier Coudert <coudert@clipper.ens.fr>
 
 This file is part of the GNU Fortran 95 runtime library (libgfortran).
@@ -27,6 +27,26 @@ see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
 #include "cpuid.h"
 #endif
 
+#if defined(__sun__) && defined(__svr4__)
+#include <signal.h>
+#include <ucontext.h>
+
+static volatile sig_atomic_t sigill_caught;
+
+static void
+sigill_hdlr (int sig __attribute((unused)),
+	     siginfo_t *sip __attribute__((unused)),
+	     ucontext_t *ucp)
+{
+  sigill_caught = 1;
+  /* Set PC to the instruction after the faulting one to skip over it,
+     otherwise we enter an infinite loop.  4 is the size of the stmxcsr
+     instruction.  */
+  ucp->uc_mcontext.gregs[EIP] += 4;
+  setcontext (ucp);
+}
+#endif
+
 static int
 has_sse (void)
 {
@@ -36,6 +56,31 @@ has_sse (void)
   if (!__get_cpuid (1, &eax, &ebx, &ecx, &edx))
     return 0;
 
+#if defined(__sun__) && defined(__svr4__)
+  /* Solaris 2 before Solaris 9 4/04 cannot execute SSE instructions even
+     if the CPU supports them.  Programs receive SIGILL instead, so check
+     for that at runtime.  */
+
+  if (edx & bit_SSE)
+    {
+      struct sigaction act, oact;
+      unsigned int cw_sse;
+
+      act.sa_handler = sigill_hdlr;
+      sigemptyset (&act.sa_mask);
+      /* Need to set SA_SIGINFO so a ucontext_t * is passed to the handler.  */
+      act.sa_flags = SA_SIGINFO;
+      sigaction (SIGILL, &act, &oact);
+
+      asm volatile ("stmxcsr %0" : "=m" (cw_sse));
+
+      sigaction (SIGILL, &oact, NULL);
+
+      if (sigill_caught)
+	return 0;
+    }
+#endif /* __sun__ && __svr4__ */
+
   return edx & bit_SSE;
 #else
   return 1;