obtained gcc-4.6.4.tar.bz2 from upstream website;upstream

verified gcc-4.6.4.tar.bz2.sig;
imported gcc-4.6.4 source tree from verified upstream tarball.

downloading a git-generated archive based on the 'upstream' tag
should provide you with a source tree that is binary identical
to the one extracted from the above tarball.

if you have obtained the source via the command 'git clone',
however, do note that line-endings of files in your working
directory might differ from line-endings of the respective
files in the upstream repository.

1 files changed, 50 insertions, 0 deletions

diff --git a/libstdc++-v3/src/hash-long-double-aux.cc b/libstdc++-v3/src/hash-long-double-aux.cc
new file mode 100644
index 000000000..d54d635f8
--- /dev/null
+++ b/libstdc++-v3/src/hash-long-double-aux.cc
@@ -0,0 +1,50 @@
+//  std::hash and std::tr1::hash definitions, long double bits -*- C++ -*-
+
+// Copyright (C) 2010 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// Under Section 7 of GPL version 3, you are granted additional
+// permissions described in the GCC Runtime Library Exception, version
+// 3.1, as published by the Free Software Foundation.
+
+// You should have received a copy of the GNU General Public License and
+// a copy of the GCC Runtime Library Exception along with this program;
+// see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+// <http://www.gnu.org/licenses/>.
+
+  // For long double, careful with random padding bits (e.g., on x86,
+  // 10 bytes -> 12 bytes) and resort to frexp.
+  template<>
+    size_t
+    hash<long double>::operator()(long double __val) const
+    {
+      // 0 and -0 both hash to zero.
+      if (__val == 0.0L)
+	return 0;
+
+      int __exponent;
+      __val = __builtin_frexpl(__val, &__exponent);
+      __val = __val < 0.0l ? -(__val + 0.5l) : __val;
+
+      const long double __mult = __SIZE_MAX__ + 1.0l;
+      __val *= __mult;
+
+      // Try to use all the bits of the mantissa (really necessary only
+      // on 32-bit targets, at least for 80-bit floating point formats).
+      const size_t __hibits = (size_t)__val;
+      __val = (__val - (long double)__hibits) * __mult;
+
+      const size_t __coeff = __SIZE_MAX__ / __LDBL_MAX_EXP__;
+
+      return __hibits + (size_t)__val + __coeff * __exponent;
+    }