glibc

History

Joseph Myers ce8fc784e6 Fix sign of remquo zero remainder in round-downward mode (bug 17987).

Various remquo implementations produce a zero remainder with the wrong
sign (a zero remainder should always have the sign of the first
argument, as specified in IEEE 754) in round-downward mode, resulting
from the sign of 0 - 0.  This patch checks for zero results and fixes
their sign accordingly.

Tested for x86_64, x86, mips64 and powerpc.

	[BZ #17987]
	* sysdeps/ieee754/dbl-64/s_remquo.c (__remquo): Ensure sign of
	zero result does not depend on the sign resulting from
	subtraction.
	* sysdeps/ieee754/dbl-64/wordsize-64/s_remquo.c (__remquo):
	Likewise.
	* sysdeps/ieee754/flt-32/s_remquof.c (__remquof): Likewise.
	* sysdeps/ieee754/ldbl-128/s_remquol.c (__remquol): Likewise.
	* sysdeps/ieee754/ldbl-128ibm/s_remquol.c (__remquol): Likewise.
	* sysdeps/ieee754/ldbl-96/s_remquol.c (__remquol): Likewise.
	* math/libm-test.inc (remquo_test_data): Add more tests.

2015-02-17 00:41:50 +00:00

bits

Update copyright dates with scripts/update-copyrights.

2015-01-02 16:29:47 +00:00

dbl-64

Fix sign of remquo zero remainder in round-downward mode (bug 17987).

2015-02-17 00:41:50 +00:00

flt-32

Fix sign of remquo zero remainder in round-downward mode (bug 17987).

2015-02-17 00:41:50 +00:00

ldbl-64-128

Update copyright dates with scripts/update-copyrights.