diff options
Diffstat (limited to 'sysdeps/ieee754/ldbl-128/s_llrintl.c')
| -rw-r--r-- | sysdeps/ieee754/ldbl-128/s_llrintl.c | 35 |
1 files changed, 31 insertions, 4 deletions
diff --git a/sysdeps/ieee754/ldbl-128/s_llrintl.c b/sysdeps/ieee754/ldbl-128/s_llrintl.c index 77eb2d67e9..b9e2178cf2 100644 --- a/sysdeps/ieee754/ldbl-128/s_llrintl.c +++ b/sysdeps/ieee754/ldbl-128/s_llrintl.c @@ -19,6 +19,8 @@ License along with the GNU C Library; if not, see <http://www.gnu.org/licenses/>. */ +#include <fenv.h> +#include <limits.h> #include <math.h> #include <math_private.h> @@ -47,8 +49,21 @@ __llrintl (long double x) if (j0 < (int32_t) (8 * sizeof (long long int)) - 1) { - w = two112[sx] + x; - t = w - two112[sx]; +#if defined FE_INVALID || defined FE_INEXACT + /* X < LLONG_MAX + 1 implied by J0 < 63. */ + if (x > (long double) LLONG_MAX) + { + /* In the event of overflow we must raise the "invalid" + exception, but not "inexact". */ + t = __nearbyintl (x); + feraiseexcept (t == LLONG_MAX ? FE_INEXACT : FE_INVALID); + } + else +#endif + { + w = two112[sx] + x; + t = w - two112[sx]; + } GET_LDOUBLE_WORDS64 (i0, i1, t); j0 = ((i0 >> 48) & 0x7fff) - 0x3fff; i0 &= 0x0000ffffffffffffLL; @@ -63,8 +78,20 @@ __llrintl (long double x) } else { - /* The number is too large. It is left implementation defined - what happens. */ + /* The number is too large. Unless it rounds to LLONG_MIN, + FE_INVALID must be raised and the return value is + unspecified. */ +#if defined FE_INVALID || defined FE_INEXACT + if (x < (long double) LLONG_MIN + && x > (long double) LLONG_MIN - 1.0L) + { + /* If truncation produces LLONG_MIN, the cast will not raise + the exception, but may raise "inexact". */ + t = __nearbyintl (x); + feraiseexcept (t == LLONG_MIN ? FE_INEXACT : FE_INVALID); + return LLONG_MIN; + } +#endif return (long long int) x; } |