diff options
Diffstat (limited to 'sysdeps/ieee754/ldbl-128/s_lroundl.c')
| -rw-r--r-- | sysdeps/ieee754/ldbl-128/s_lroundl.c | 63 |
1 files changed, 50 insertions, 13 deletions
diff --git a/sysdeps/ieee754/ldbl-128/s_lroundl.c b/sysdeps/ieee754/ldbl-128/s_lroundl.c index 8421609676..f03262543f 100644 --- a/sysdeps/ieee754/ldbl-128/s_lroundl.c +++ b/sysdeps/ieee754/ldbl-128/s_lroundl.c @@ -1,5 +1,5 @@ /* Round long double value to long int. - 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. @@ -18,10 +18,12 @@ 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> long int __lroundl (long double x) @@ -37,19 +39,26 @@ __lroundl (long double x) i0 &= 0x0000ffffffffffffLL; i0 |= 0x0001000000000000LL; - if (j0 < 48) + if (j0 < (int32_t) (8 * sizeof (long int)) - 1) { - if (j0 < 0) - return j0 < -1 ? 0 : sign; - else + if (j0 < 48) { - i0 += 0x0000800000000000LL >> j0; - result = i0 >> (48 - j0); + if (j0 < 0) + return j0 < -1 ? 0 : sign; + else + { + i0 += 0x0000800000000000LL >> j0; + result = i0 >> (48 - 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 if (j0 < (int32_t) (8 * sizeof (long int)) - 1) - { - if (j0 >= 112) + else if (j0 >= 112) result = ((long int) i0 << (j0 - 48)) | (i1 << (j0 - 112)); else { @@ -60,11 +69,39 @@ __lroundl (long double x) if (j0 == 48) result = (long int) i0; else - result = ((long int) i0 << (j0 - 48)) | (j >> (112 - j0)); + { + result = ((long int) i0 << (j0 - 48)) | (j >> (112 - j0)); +#ifdef FE_INVALID + if (sizeof (long int) == 8 + && sign == 1 + && result == LONG_MIN) + /* Rounding brought the value out of range. */ + feraiseexcept (FE_INVALID); +#endif + } } } else { + /* 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 (FIX_LDBL_LONG_CONVERT_OVERFLOW + && !(sign == -1 && x > (long double) LONG_MIN - 0.5L)) + { + feraiseexcept (FE_INVALID); + return sign == 1 ? LONG_MAX : LONG_MIN; + } + else if (!FIX_LDBL_LONG_CONVERT_OVERFLOW + && x <= (long double) LONG_MIN - 0.5L) + { + /* If truncation produces LONG_MIN, the cast will not raise + the exception, but may raise "inexact". */ + feraiseexcept (FE_INVALID); + return LONG_MIN; + } +#endif /* The number is too large. It is left implementation defined what happens. */ return (long int) x; |