re PR libfortran/24313 (complex sqrt function does not return principal value)

PR libgfortran/24313
* c99_functions.c (csqrtf, csqrt): Fix choice of branch cut.  Note
  csqrt{f} were imported from glibc, and this bug is still present
  there. glibc PR is 1146.

From-SVN: r105274

gcc/testsuite/ChangeLog

@@ -1,3 +1,8 @@
+2005-10-11  Steven G. Kargl  <kargls@comcast.net>
+
+	PR libgfortran/24313
+	gfortran.dg/csqrt.f: New test.
+
 2005-10-11  Ian Lance Taylor  <ian@airs.com>
 
 	PR c++/8057

gcc/testsuite/gfortran.dg/csqrt_2.f

@@ -0,0 +1,19 @@
+c { dg-do run { xfail *-*-linux-gnu } }
+c Fix PR libgfortran/24313
+      complex x, y
+      complex z
+      z = cmplx(0.707106, -0.707106)
+      x = cmplx(0.0,-1.0)
+      y = sqrt(x)
+      if (abs(y - z) / abs(z) > 1.e-4) call abort
+
+      x = cmplx(tiny(1.),-1.0)
+      y = sqrt(x)
+      if (abs(y - z) / abs(z) > 1.e-4) call abort
+
+      x = cmplx(-tiny(1.),-1.0)
+      y = sqrt(x)
+      if (abs(y - z) / abs(z) > 1.e-4) call abort
+
+      end
+

libgfortran/ChangeLog

@@ -1,3 +1,10 @@
+2005-10-11  Steven G. Kargl  <kargls@comcast.net>
+
+	PR libgfortran/24313
+	*  c99_functions.c (csqrtf, csqrt): Fix choice of branch cut.  Note
+	csqrt{f} were imported from glibc, and this bug is still present 
+	there. glibc PR is 1146.
+
 2005-10-07  Janne Blomqvist <jblomqvi@cc.hut.fi>
 
 	PR fortran/16339

libgfortran/intrinsics/c99_functions.c

@@ -669,7 +669,7 @@ csqrtf (float complex z)
 
       r = sqrtf (0.5 * fabsf (im));
 
-      COMPLEX_ASSIGN (v, copysignf (r, im), r);
+      COMPLEX_ASSIGN (v, r, copysignf (r, im));
     }
   else
     {
@@ -722,7 +722,7 @@ csqrt (double complex z)
 
       r = sqrt (0.5 * fabs (im));
 
-      COMPLEX_ASSIGN (v, copysign (r, im), r);
+      COMPLEX_ASSIGN (v, r, copysign (r, im));
     }
   else
     {