From 9a71f1fcf53615c00b5f9e5da4bba92bccb0efb4 Mon Sep 17 00:00:00 2001 From: Joseph Myers Date: Thu, 14 May 2015 23:51:09 +0000 Subject: Fix atanf spurious underflows (bug 18196). The sysdeps/ieee754/flt-32 version of atanf produces spurious underflow exceptions for some large arguments, because of computations that compute x^-4. This patch fixes this by adjusting the threshold for large arguments (for which +/- pi/2 can just be returned, the correct result being roughly +/- pi/2 - 1/x) from 2^34 to 2^25. Tested for x86_64 and x86. [BZ #18196] * sysdeps/ieee754/flt-32/s_atanf.c (__atanf): Use 2^25 not 2^34 as threshold for large arguments. * math/auto-libm-test-in: Add another test of atan. * math/auto-libm-test-out: Regenerated. --- NEWS | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'NEWS') diff --git a/NEWS b/NEWS index a9b0138b3e..c46ee35103 100644 --- a/NEWS +++ b/NEWS @@ -16,8 +16,8 @@ Version 2.22 17964, 17965, 17967, 17969, 17978, 17987, 17991, 17996, 17998, 17999, 18007, 18019, 18020, 18029, 18030, 18032, 18036, 18038, 18039, 18042, 18043, 18046, 18047, 18068, 18080, 18093, 18100, 18104, 18110, 18111, - 18125, 18128, 18138, 18185, 18197, 18206, 18210, 18211, 18247, 18287, - 18319, 18333, 18346, 18397, 18409. + 18125, 18128, 18138, 18185, 18196, 18197, 18206, 18210, 18211, 18247, + 18287, 18319, 18333, 18346, 18397, 18409. * Cache information can be queried via sysconf() function on s390 e.g. with _SC_LEVEL1_ICACHE_SIZE as argument. -- cgit 1.4.1