[PATCH] Use ldexp instead of scalbln for portability (PR other/64370)

[Jakub Jelinek]

Hi!

As mentioned in the PR, HPUX doesn't have scalbln, but does have ldexp and
that function is already used in gcj-dump, so supposedly it is more portable
to use ldexp.  Also in glibc it is defined in libc in addition to libm.

Bootstrapped/regtested on x86_64-linux and i686-linux, ok for trunk?

2015-01-12  Jakub Jelinek  <ja...@redhat.com>

        PR other/64370
        * sreal.c (sreal::to_double): Use ldexp instead of scalbnl.

--- gcc/sreal.c.jj      2015-01-09 12:01:33.000000000 +0100
+++ gcc/sreal.c 2015-01-12 14:26:44.339128332 +0100
@@ -122,7 +122,7 @@ sreal::to_double () const
 {
   double val = m_sig;
   if (m_exp)
-    val = scalbln (val, m_exp);
+    val = ldexp (val, m_exp);
   return val;
 }
 

        Jakub