From: Ulrich Drepper <drepper@redhat.com>
Date: Tue, 19 Oct 1999 03:31:52 +0000 (+0000)
Subject: (__cprojf): Fix bug: NaN + i NaN returns now NaN + i NaN.
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1b0a1793135d43ca5bcb386cab51874e78829106;p=thirdparty%2Fglibc.git

(__cprojf): Fix bug: NaN + i NaN returns now NaN + i NaN.
---

diff --git a/sysdeps/libm-ieee754/s_cprojf.c b/sysdeps/libm-ieee754/s_cprojf.c
index b90590835c8..6ec8b660018 100644
--- a/sysdeps/libm-ieee754/s_cprojf.c
+++ b/sysdeps/libm-ieee754/s_cprojf.c
@@ -1,5 +1,5 @@
 /* Compute projection of complex float value to Riemann sphere.
-   Copyright (C) 1997 Free Software Foundation, Inc.
+   Copyright (C) 1997, 1999 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
 
@@ -27,7 +27,9 @@ __cprojf (__complex__ float x)
 {
   __complex__ float res;
 
-  if (!isfinite (__real__ x) || !isfinite (__imag__ x))
+  if (isnan (__real__ x) && isnan (__imag__ x))
+    return x;
+  else if (!isfinite (__real__ x) || !isfinite (__imag__ x))
     {
       __real__ res = INFINITY;
       __imag__ res = __copysignf (0.0, __imag__ x);