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/* Test that exact underflow in __float128 signals the underflow
exception if trapping is enabled, but does not raise the flag
otherwise. */
/* { dg-do run { target i?86-*-*gnu* x86_64-*-*gnu* } } */
/* { dg-options "-D_GNU_SOURCE" } */
/* { dg-require-effective-target fenv_exceptions } */
#include <fenv.h>
#include <setjmp.h>
#include <signal.h>
#include <stdlib.h>
volatile sig_atomic_t caught_sigfpe;
sigjmp_buf buf;
static void
handle_sigfpe (int sig)
{
caught_sigfpe = 1;
siglongjmp (buf, 1);
}
int
main (void)
{
volatile __float128 a = 0x1p-16382q, b = 0x1p-2q;
volatile __float128 r;
r = a * b;
if (fetestexcept (FE_UNDERFLOW))
abort ();
if (r != 0x1p-16384q)
abort ();
feenableexcept (FE_UNDERFLOW);
signal (SIGFPE, handle_sigfpe);
if (sigsetjmp (buf, 1) == 0)
r = a * b;
if (!caught_sigfpe)
abort ();
exit (0);
}
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