[src/trunk]: src/lib/libm/complex similar to csqrt, spare ourselves a fabsf c...

[maya <maya%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/0152d3b6234c
branches:  trunk
changeset: 820144:0152d3b6234c
user:      maya <maya%NetBSD.org@localhost>
date:      Sat Dec 31 22:54:56 2016 +0000

description:
similar to csqrt, spare ourselves a fabsf call. we already check sign
later on, use this to our advantage.

No functional change.

diffstat:

 lib/libm/complex/csqrtf.c |  11 ++++++-----
 1 files changed, 6 insertions(+), 5 deletions(-)

diffs (27 lines):

diff -r 21f2a09986df -r 0152d3b6234c lib/libm/complex/csqrtf.c
--- a/lib/libm/complex/csqrtf.c Sat Dec 31 22:47:01 2016 +0000
+++ b/lib/libm/complex/csqrtf.c Sat Dec 31 22:54:56 2016 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: csqrtf.c,v 1.2 2016/12/31 20:01:15 maya Exp $ */
+/* $NetBSD: csqrtf.c,v 1.3 2016/12/31 22:54:56 maya Exp $ */
 
 /*-
  * Copyright (c) 2007 The NetBSD Foundation, Inc.
@@ -55,12 +55,13 @@
        }
 
        if (x == 0.0f) {
-               r = fabsf(y);
-               r = sqrtf(0.5f * r);
-               if (y > 0)
+               if (y > 0) {
+                       r = sqrtf(0.5f * y);
                        w = r + r * I;
-               else
+               } else {
+                       r = sqrtf(-0.5f * y);
                        w = r - r * I;
+               }
                return w;
        }