diff options
Diffstat (limited to 'sysdeps/ieee754/ldbl-128/s_llroundl.c')
| -rw-r--r-- | sysdeps/ieee754/ldbl-128/s_llroundl.c | 25 |
1 files changed, 22 insertions, 3 deletions
diff --git a/sysdeps/ieee754/ldbl-128/s_llroundl.c b/sysdeps/ieee754/ldbl-128/s_llroundl.c index 4adc50eaa4..235a433dbe 100644 --- a/sysdeps/ieee754/ldbl-128/s_llroundl.c +++ b/sysdeps/ieee754/ldbl-128/s_llroundl.c @@ -18,6 +18,8 @@ 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> @@ -60,13 +62,30 @@ __llroundl (long double x) if (j0 == 48) result = (long long int) i0; else - result = ((long long int) i0 << (j0 - 48)) | (j >> (112 - j0)); + { + result = ((long long int) i0 << (j0 - 48)) | (j >> (112 - j0)); +#ifdef FE_INVALID + if (sign == 1 && result == LLONG_MIN) + /* Rounding brought the value out of range. */ + feraiseexcept (FE_INVALID); +#endif + } } } 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. */ +#ifdef FE_INVALID + if (x <= (long double) LLONG_MIN - 0.5L) + { + /* If truncation produces LLONG_MIN, the cast will not raise + the exception, but may raise "inexact". */ + feraiseexcept (FE_INVALID); + return LLONG_MIN; + } +#endif return (long long int) x; } |