diff options
Diffstat (limited to 'sysdeps/ieee754/ldbl-128/s_llrintl.c')
| -rw-r--r-- | sysdeps/ieee754/ldbl-128/s_llrintl.c | 46 |
1 files changed, 40 insertions, 6 deletions
diff --git a/sysdeps/ieee754/ldbl-128/s_llrintl.c b/sysdeps/ieee754/ldbl-128/s_llrintl.c index 27196c95a4..84fc576ab6 100644 --- a/sysdeps/ieee754/ldbl-128/s_llrintl.c +++ b/sysdeps/ieee754/ldbl-128/s_llrintl.c @@ -1,6 +1,6 @@ /* Round argument to nearest integral value according to current rounding direction. - Copyright (C) 1997-2015 Free Software Foundation, Inc. + Copyright (C) 1997-2016 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997 and Jakub Jelinek <jj@ultra.linux.cz>, 1999. @@ -19,9 +19,12 @@ 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> +#include <fix-fp-int-convert-overflow.h> static const long double two112[2] = { @@ -34,7 +37,7 @@ __llrintl (long double x) { int32_t j0; u_int64_t i0,i1; - volatile long double w; + long double w; long double t; long long int result; int sx; @@ -47,8 +50,21 @@ __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 +79,26 @@ __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; + } + else if (FIX_LDBL_LLONG_CONVERT_OVERFLOW && x != (long double) LLONG_MIN) + { + feraiseexcept (FE_INVALID); + return sx == 0 ? LLONG_MAX : LLONG_MIN; + } + +#endif return (long long int) x; } |