diff options
Diffstat (limited to 'libquadmath/math/llroundq.c')
| -rw-r--r-- | libquadmath/math/llroundq.c | 29 |
1 files changed, 24 insertions, 5 deletions
diff --git a/libquadmath/math/llroundq.c b/libquadmath/math/llroundq.c index d22180d6bba..098fb9ef72b 100644 --- a/libquadmath/math/llroundq.c +++ b/libquadmath/math/llroundq.c @@ -1,8 +1,8 @@ /* Round __float128 value to long long int. - Copyright (C) 1997, 1999, 2004 Free Software Foundation, Inc. + Copyright (C) 1997-2017 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. + Jakub Jelinek <jj@ultra.linux.cz>, 1999. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public @@ -59,13 +59,32 @@ llroundq (__float128 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)); +#if defined FE_INVALID && defined USE_FENV_H + 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 <= (__float128) LLONG_MIN - 0.5Q) + { + /* If truncation produces LLONG_MIN, the cast will not raise + the exception, but may raise "inexact". */ +#ifdef USE_FENV_H + feraiseexcept (FE_INVALID); +#endif + return LLONG_MIN; + } +#endif return (long long int) x; } |