From 7ee06ef15827f8f2582a94b1ceaad47eaf502744 Mon Sep 17 00:00:00 2001 From: Joseph Myers Date: Mon, 10 Aug 2015 20:35:30 +0000 Subject: Fix ldbl-128ibm tanhl inaccuracy (bug 18790). ldbl-128ibm tanhl uses a too-small threshold to decide when to return +/-1, resulting in large errors. This patch changes it to a more appropriate threshold (the requirement is for 2*exp(-2|x|) to be small in terms of ulps of 1). Tested for x86_64, x86 and powerpc. [BZ #18790] * sysdeps/ieee754/ldbl-128ibm/s_tanhl.c (__tanhl): Increase threshold for returning +/- 1. * math/auto-libm-test-in: Add more tests of tanh. * math/auto-libm-test-out: Regenerated. * sysdeps/i386/fpu/libm-test-ulps: Update. --- ChangeLog | 9 +++++++++ 1 file changed, 9 insertions(+) (limited to 'ChangeLog') diff --git a/ChangeLog b/ChangeLog index 3c30529b72..8d640e8d62 100644 --- a/ChangeLog +++ b/ChangeLog @@ -1,3 +1,12 @@ +2015-08-10 Joseph Myers + + [BZ #18790] + * sysdeps/ieee754/ldbl-128ibm/s_tanhl.c (__tanhl): Increase + threshold for returning +/- 1. + * math/auto-libm-test-in: Add more tests of tanh. + * math/auto-libm-test-out: Regenerated. + * sysdeps/i386/fpu/libm-test-ulps: Update. + 2015-08-10 Andreas Schwab [BZ #18781] -- cgit 1.4.1