about summary refs log tree commit diff
path: root/posix
diff options
context:
space:
mode:
authorJoseph Myers <joseph@codesourcery.com>2015-02-26 12:57:21 +0000
committerJoseph Myers <joseph@codesourcery.com>2015-02-26 12:57:21 +0000
commit524ae9ea2e3ae9f5bf5d655595fda827e9dc50a1 (patch)
tree363ab7a9bab473dc18c22b1179d8b549d8497f80 /posix
parent23d43090e0b275e47e09e859823e965a1eb323dc (diff)
downloadglibc-524ae9ea2e3ae9f5bf5d655595fda827e9dc50a1.tar.gz
glibc-524ae9ea2e3ae9f5bf5d655595fda827e9dc50a1.tar.xz
glibc-524ae9ea2e3ae9f5bf5d655595fda827e9dc50a1.zip
Fix ldbl-128ibm ilogbl near powers of 2 (bug 18029).
The ldbl-128ibm implementation of ilogbl produces incorrect results
when the high part of the argument is a power of 2 and the low part a
nonzero number with the opposite sign (and so the returned exponent
should be 1 less than that of the high part).  For example, ilogbl
(0x1.ffffffffffffffp1L) returns 2 but should return 1.  (This is
similar to (fixed) bug 16740 for frexpl, and bug 18030 for logbl.)
This patch adds checks for that case.

Tested for powerpc.

	[BZ #18029]
	* sysdeps/ieee754/ldbl-128ibm/e_ilogbl.c (__ieee754_ilogbl):
	Adjust exponent of power of 2 down when low part has opposite
	sign.
	* math/libm-test.inc (ilogb_test_data): Add more tests.
Diffstat (limited to 'posix')
0 files changed, 0 insertions, 0 deletions