diff options
Diffstat (limited to 'sysdeps/ieee754/dbl-64/wordsize-64/s_lround.c')
| -rw-r--r-- | sysdeps/ieee754/dbl-64/wordsize-64/s_lround.c | 24 |
1 files changed, 22 insertions, 2 deletions
diff --git a/sysdeps/ieee754/dbl-64/wordsize-64/s_lround.c b/sysdeps/ieee754/dbl-64/wordsize-64/s_lround.c index 390e733ffd..bbc0628c04 100644 --- a/sysdeps/ieee754/dbl-64/wordsize-64/s_lround.c +++ b/sysdeps/ieee754/dbl-64/wordsize-64/s_lround.c @@ -16,6 +16,8 @@ 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> @@ -48,12 +50,30 @@ __lround (double x) i0 += UINT64_C(0x8000000000000) >> j0; result = i0 >> (52 - j0); +#ifdef FE_INVALID + if (sizeof (long int) == 4 + && sign == 1 + && result == LONG_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 LONG_MIN, + FE_INVALID must be raised and the return value is + unspecified. */ +#ifdef FE_INVALID + if (sizeof (long int) == 4 + && x <= (double) LONG_MIN - 0.5) + { + /* If truncation produces LONG_MIN, the cast will not raise + the exception, but may raise "inexact". */ + feraiseexcept (FE_INVALID); + return LONG_MIN; + } +#endif return (long int) x; } |