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author | Joseph Myers <joseph@codesourcery.com> | 2015-10-23 21:37:33 +0000 |
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committer | Joseph Myers <joseph@codesourcery.com> | 2015-10-23 21:37:33 +0000 |
commit | c643db8792102d1a2efad109f58139977d8608d6 (patch) | |
tree | 174813e539b6cdf509201237756ec2b02e2247ce /sysdeps/ieee754/dbl-64/e_j1.c | |
parent | 846d9a4a3acdb4939ca7bf6aed48f9f6f26911be (diff) | |
download | glibc-c643db8792102d1a2efad109f58139977d8608d6.tar.gz glibc-c643db8792102d1a2efad109f58139977d8608d6.tar.xz glibc-c643db8792102d1a2efad109f58139977d8608d6.zip |
Fix j1, jn missing errno setting on underflow (bug 18611).
j1 and jn can underflow for small arguments, but fail to set errno when underflowing to 0. This patch fixes them to set errno in that case. Tested for x86_64, x86, mips64 and powerpc. [BZ #18611] * sysdeps/ieee754/dbl-64/e_j1.c (__ieee754_j1): Set errno and avoid excess range and precision on underflow. * sysdeps/ieee754/dbl-64/e_jn.c (__ieee754_jn): Likewise. * sysdeps/ieee754/flt-32/e_j1f.c (__ieee754_j1f): Likewise. * sysdeps/ieee754/flt-32/e_jnf.c (__ieee754_jnf): Likewise. * sysdeps/ieee754/ldbl-128/e_j1l.c (__ieee754_j1l): Set errno on underflow. * sysdeps/ieee754/ldbl-128/e_jnl.c (__ieee754_jnl): Likewise. * sysdeps/ieee754/ldbl-128ibm/e_jnl.c (__ieee754_jnl): Likewise. * sysdeps/ieee754/ldbl-96/e_j1l.c (__ieee754_j1l): Likewise. * sysdeps/ieee754/ldbl-96/e_jnl.c (__ieee754_jnl): Likewise. * math/auto-libm-test-in: Do not allow missing errno setting for tests of j1 and jn. * math/auto-libm-test-out: Regenerated.
Diffstat (limited to 'sysdeps/ieee754/dbl-64/e_j1.c')
-rw-r--r-- | sysdeps/ieee754/dbl-64/e_j1.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/sysdeps/ieee754/dbl-64/e_j1.c b/sysdeps/ieee754/dbl-64/e_j1.c index 7f80b3ced0..4827fbf3d3 100644 --- a/sysdeps/ieee754/dbl-64/e_j1.c +++ b/sysdeps/ieee754/dbl-64/e_j1.c @@ -127,8 +127,10 @@ __ieee754_j1 (double x) { if (huge + x > one) /* inexact if x!=0 necessary */ { - double ret = 0.5 * x; + double ret = math_narrow_eval (0.5 * x); math_check_force_underflow (ret); + if (ret == 0 && x != 0) + __set_errno (ERANGE); return ret; } } |