| commit | e6a6b1c3de62f3ae3f0e5ac5bdcc49a3342f03e7 | |
| author | Joseph Myers <joseph@codesourcery.com> | |
| Wed, 9 Dec 2015 23:51:11 +0000 (9 23:51 +0000) | ||
| committer | Joseph Myers <joseph@codesourcery.com> | |
| Wed, 9 Dec 2015 23:51:11 +0000 (9 23:51 +0000) | ||
| tree | a239075b91eca073d80677205d27516017105e63 | treesnapshot (tar.gz zip) |
| parent | f517e06ab71e07b24bf085063b0ba2d072da4a56 | commitdiff |
Fix ldbl-128ibm logl inaccuracy near 1 (bug 19351).
The ldbl-128ibm implementation of logl is inaccurate for arguments
near 1, because when deciding whether to bypass a series expansion for
log(1+z), where z = x-1, it compares the square of z rather than z
itself with an epsilon value. This patch fixes that comparison, so
eliminating the test failures for inaccuracy of logl in such cases.
Tested for powerpc.
[BZ #19351]
* sysdeps/ieee754/ldbl-128ibm/e_logl.c (__ieee754_logl): When
expanding log(1+z), compare z rather than its square with epsilon
to determine when to avoid evaluating the expansion.
The ldbl-128ibm implementation of logl is inaccurate for arguments
near 1, because when deciding whether to bypass a series expansion for
log(1+z), where z = x-1, it compares the square of z rather than z
itself with an epsilon value. This patch fixes that comparison, so
eliminating the test failures for inaccuracy of logl in such cases.
Tested for powerpc.
[BZ #19351]
* sysdeps/ieee754/ldbl-128ibm/e_logl.c (__ieee754_logl): When
expanding log(1+z), compare z rather than its square with epsilon
to determine when to avoid evaluating the expansion.
| ChangeLog | diffblobblamehistory | |
| sysdeps/ieee754/ldbl-128ibm/e_logl.c | diffblobblamehistory |