gcc/testsuite/gcc.target/i386/sse-os-support.h

   1 #if defined(__sun__) && defined(__svr4__)
   2 /* Make sure sigaction() is declared even with -std=c99.  */
   3 #define __EXTENSIONS__
   4 #include <signal.h>
   5 #include <ucontext.h>
   6
   7 static volatile sig_atomic_t sigill_caught;
   8
   9 static void
  10 sigill_hdlr (int sig __attribute((unused)),
  11              siginfo_t *sip __attribute__((unused)),
  12              ucontext_t *ucp)
  13 {
  14   sigill_caught = 1;
  15   /* Set PC to the instruction after the faulting one to skip over it,
  16      otherwise we enter an infinite loop.  */
  17   ucp->uc_mcontext.gregs[EIP] += 4;
  18   setcontext (ucp);
  19 }
  20 #endif
  21
  22 /* Check if the OS supports executing SSE instructions.  This function is
  23    only used in sse-check.h, sse2-check.h, and sse3-check.h so far since
  24    Solaris 8 and 9 won't run on newer CPUs anyway.  */
  25
  26 static int
  27 sse_os_support (void)
  28 {
  29 #if defined(__sun__) && defined(__svr4__)
  30   /* Solaris 2 before Solaris 9 4/04 cannot execute SSE instructions
  31      even if the CPU supports them.  Programs receive SIGILL instead, so
  32      check for that at runtime.  */
  33
  34   struct sigaction act, oact;
  35
  36   act.sa_handler = sigill_hdlr;
  37   sigemptyset (&act.sa_mask);
  38   /* Need to set SA_SIGINFO so a ucontext_t * is passed to the handler.  */
  39   act.sa_flags = SA_SIGINFO;
  40   sigaction (SIGILL, &act, &oact);
  41
  42   /* We need a single SSE instruction here so the handler can safely skip
  43      over it.  */
  44   __asm__ volatile ("movss %xmm2,%xmm1");
  45
  46   sigaction (SIGILL, &oact, NULL);
  47
  48   if (sigill_caught)
  49     exit (0);
  50   else
  51     return 1;
  52 #else
  53   return 1;
  54 #endif /* __sun__ && __svr4__ */
  55 }