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#if defined(__sun__) && defined(__svr4__)

/* Make sure sigaction() is declared even with -std=c99.  */

#define __EXTENSIONS__

#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.  */

  ucp->uc_mcontext.gregs[EIP] += 4;

  setcontext (ucp);

}

#endif

/* Check if the OS supports executing SSE instructions.  This function is

   only used in sse-check.h, sse2-check.h, and sse3-check.h so far since

   Solaris 8 and 9 won't run on newer CPUs anyway.  */

static int

sse_os_support (void)

{

#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.  */

  struct sigaction act, oact;

  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);

  /* We need a single SSE instruction here so the handler can safely skip

     over it.  */

  __asm__ volatile ("movss %xmm2,%xmm1");

  sigaction (SIGILL, &oact, NULL);

  if (sigill_caught)

    exit (0);

  else

    return 1;

#else

  return 1;

#endif /* __sun__ && __svr4__ */

}