PR libstdc++/10689

[pf3gnuchains/gcc-fork.git] / libstdc++-v3 / include / std / std_complex.h

diff --git a/libstdc++-v3/include/std/std_complex.h b/libstdc++-v3/include/std/std_complex.h
index 87e4bcb..e943f5e 100644 (file)
--- a/libstdc++-v3/include/std/std_complex.h
+++ b/libstdc++-v3/include/std/std_complex.h
@@ -565,24 +565,30 @@ namespace std
     }
 
   template<typename _Tp>
-    inline complex<_Tp>
+    complex<_Tp>
     pow(const complex<_Tp>& __x, const _Tp& __y)
     {
-      return exp(__y * log(__x));
+      if (__x.imag() == _Tp())
+        return pow(__x.real(), __y);
+
+      complex<_Tp> __t = log(__x);
+      return polar(exp(__y * __t.real()), __y * __t.imag());
     }
 
   template<typename _Tp>
     inline complex<_Tp>
     pow(const complex<_Tp>& __x, const complex<_Tp>& __y)
     {
-      return exp(__y * log(__x));
+      return __x == _Tp() ? _Tp() : exp(__y * log(__x));
     }
 
   template<typename _Tp>
     inline complex<_Tp>
     pow(const _Tp& __x, const complex<_Tp>& __y)
     {
-      return exp(__y * log(__x));
+      return __x == _Tp()
+        ? _Tp()
+        : polar(pow(__x, __y.real()), __y.imag() * log(__x));
     }
 
   // 26.2.3  complex specializations