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PR/51427 CVS commit: src/lib/libm/complex
The following reply was made to PR lib/51427; it has been noted by GNATS.
From: "Maya Rashish" <maya%netbsd.org@localhost>
Subject: PR/51427 CVS commit: src/lib/libm/complex
Date: Sat, 31 Dec 2016 20:01:15 +0000
Module Name: src
Committed By: maya
Date: Sat Dec 31 20:01:15 UTC 2016
src/lib/libm/complex: csqrt.c csqrtf.c
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
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.
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