CVS commit: src/lib/libm/complex

["Maya Rashish" <maya%netbsd.org@localhost>]

Module Name:    src
Committed By:   maya
Date:           Sat Dec 31 20:01:15 UTC 2016

Modified Files:
        src/lib/libm/complex: csqrt.c csqrtf.c

Log Message:
csqrt has a branch cut on the negative real axis, and this requires
delicacy in order to maintain continuity around it.

we have an initial case to deal with a fairly common case: getting
a real number. Avoid dealing with the branch cut in this case by
checking if the real part is negative.

later, -0.0 < 0 is not met, so instead, test for a negative number
using signbit, so negative zero is also treated as a negative number.

Fixes last part of PR lib/51427: libm issues triggered by py-numpy

ok riastradh


To generate a diff of this commit:
cvs rdiff -u -r1.2 -r1.3 src/lib/libm/complex/csqrt.c
cvs rdiff -u -r1.1 -r1.2 src/lib/libm/complex/csqrtf.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.