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| author | Joseph Myers <joseph@codesourcery.com> | 2013-12-03 16:25:18 +0000 |
|---|---|---|
| committer | Joseph Myers <joseph@codesourcery.com> | 2013-12-03 16:25:18 +0000 |
| commit | 34e16df5a1a46e128edb9eb44a09ac5762957136 (patch) | |
| tree | d8751230a2270d89531af1f7c12868dae50f534f /sysdeps/ieee754/ldbl-128ibm/s_erfl.c | |
| parent | d8e2dbe3e380729a1552d546da582b02202dde0a (diff) | |
| download | glibc-34e16df5a1a46e128edb9eb44a09ac5762957136.zip glibc-34e16df5a1a46e128edb9eb44a09ac5762957136.tar.gz glibc-34e16df5a1a46e128edb9eb44a09ac5762957136.tar.bz2 | |
Fix erfc errno setting on underflow (bug 6786).
Diffstat (limited to 'sysdeps/ieee754/ldbl-128ibm/s_erfl.c')
| -rw-r--r-- | sysdeps/ieee754/ldbl-128ibm/s_erfl.c | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/sysdeps/ieee754/ldbl-128ibm/s_erfl.c b/sysdeps/ieee754/ldbl-128ibm/s_erfl.c index c861c65..95dc415 100644 --- a/sysdeps/ieee754/ldbl-128ibm/s_erfl.c +++ b/sysdeps/ieee754/ldbl-128ibm/s_erfl.c @@ -101,6 +101,7 @@ * erfc/erf(NaN) is NaN */ +#include <errno.h> #include <math.h> #include <math_private.h> #include <math_ldbl_opt.h> @@ -940,14 +941,22 @@ __erfcl (long double x) r = __ieee754_expl (-z * z - 0.5625) * __ieee754_expl ((z - x) * (z + x) + p); if ((hx & 0x80000000) == 0) - return r / x; + { + long double ret = r / x; + if (ret == 0) + __set_errno (ERANGE); + return ret; + } else return two - r / x; } else { if ((hx & 0x80000000) == 0) - return tiny * tiny; + { + __set_errno (ERANGE); + return tiny * tiny; + } else return two - tiny; } |