libstdc++: Add mem_order_hle_acquire/release to atomic.h v2

The underlying compiler supports additional __ATOMIC_HLE_ACQUIRE/RELEASE
memmodel flags for TSX, but this was not exposed to the C++ wrapper.
Handle it there.

These are additional flags, so some of assert checks need to mask
off the flags before checking the memory model type.

libstdc++-v3/:
2013-01-12  Andi Kleen  <ak@linux.intel.com>
	    Jonathan Wakely  <jwakely.gcc@gmail.com>

        PR libstdc++/55223
	* include/bits/atomic_base.h (__memory_order_modifier): Add
	__memory_order_mask, __memory_order_modifier_mask,
	__memory_order_hle_acquire, __memory_order_hle_release.
	(operator|,operator&): Add.
	(__cmpexch_failure_order):  Rename to __cmpexch_failure_order2.
	(__cmpexch_failure_order): Add.
	(clear, store, load, compare_exchange_weak, compare_exchange_strong):
	Handle flags.
	* testsuite/29_atomics/atomic_flag/test_and_set/explicit-hle.cc:
	Add.

Co-Authored-By: Jonathan Wakely <jwakely.gcc@gmail.com>

From-SVN: r195321

libstdc++-v3/ChangeLog

+2013-01-12  Andi Kleen  <ak@linux.intel.com>
+	    Jonathan Wakely  <jwakely.gcc@gmail.com>
+
+	PR libstdc++/55223
+	* include/bits/atomic_base.h (__memory_order_modifier): Add
+	__memory_order_mask, __memory_order_modifier_mask,
+	__memory_order_hle_acquire, __memory_order_hle_release.
+	(operator|,operator&): Add.
+	(__cmpexch_failure_order):  Rename to __cmpexch_failure_order2.
+	(__cmpexch_failure_order): Add.
+	(clear, store, load, compare_exchange_weak, compare_exchange_strong):
+	Handle flags.
+	* testsuite/29_atomics/atomic_flag/test_and_set/explicit-hle.cc:
+	Add.
+
 2013-01-19  Jonathan Wakely  <jwakely.gcc@gmail.com>
 
 	PR libstdc++/55861

libstdc++-v3/testsuite/29_atomics/atomic_flag/test_and_set/explicit-hle.cc

+// { dg-options "-std=gnu++0x" }
+// { dg-do compile { target i?86-*-* x86_64-*-* } }
+// { dg-final { scan-assembler-times "\(xacquire\|\.byte.*0xf2\)" 14 } }
+// { dg-final { scan-assembler-times "\(xrelease\|\.byte.*0xf3\)" 14 } }
+
+// Copyright (C) 2008, 2009, 2013 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.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3.  If not see
+// <http://www.gnu.org/licenses/>.
+
+#include <atomic>
+
+#define ACQ memory_order_acquire | __memory_order_hle_acquire
+#define REL memory_order_release | __memory_order_hle_release
+
+int main()
+{
+  unsigned zero, one;
+  using namespace std;
+  atomic_flag af = ATOMIC_FLAG_INIT;
+
+  if (!af.test_and_set(ACQ))
+    af.clear(REL);
+
+  atomic_uint au = ATOMIC_VAR_INIT(0);
+
+  if (au.exchange(1, ACQ))
+    au.store(0, REL);
+
+  if (au.exchange(1, ACQ))
+    au.exchange(0, REL);
+
+  zero = 0;
+  one = 1;
+  if (au.compare_exchange_weak(zero, 1, ACQ, memory_order_consume))
+    au.compare_exchange_weak(one, 0, REL, memory_order_consume);
+
+  zero = 0;
+  one = 1;
+  if (au.compare_exchange_strong(zero, 1, ACQ, memory_order_consume))
+    au.compare_exchange_strong(one, 0, REL, memory_order_consume);
+
+  if (!au.fetch_add(1, ACQ))
+    au.fetch_add(-1, REL);
+
+  if (!au.fetch_sub(1, ACQ))
+    au.fetch_sub(-1, REL);
+
+#if 0 /* broken in underlying target */
+  if (!au.fetch_and(1, ACQ))
+    au.fetch_and(-1, REL);
+
+  if (!au.fetch_or(1, ACQ))
+    au.fetch_or(-1, REL);
+
+  if (!au.fetch_xor(1, ACQ))
+    au.fetch_xor(-1, REL);
+
+  if (!au.fetch_nand(1, ACQ))
+    au.fetch_nand(-1, REL);
+#endif
+
+  volatile atomic_flag vaf = ATOMIC_FLAG_INIT;
+
+  if (!vaf.test_and_set(ACQ))
+    vaf.clear(REL);
+
+  volatile atomic_uint vau = ATOMIC_VAR_INIT(0);
+
+  if (!vau.exchange(1, ACQ))
+    vau.store(0, REL);
+
+  if (!vau.exchange(1, ACQ))
+    vau.exchange(0, REL);
+
+  zero = 0;
+  one = 1;
+  if (vau.compare_exchange_weak(zero, 1, ACQ, memory_order_consume))
+    vau.compare_exchange_weak(one, 0, REL, memory_order_consume);
+
+  zero = 0;
+  one = 1;
+  if (vau.compare_exchange_strong(zero, 1, ACQ, memory_order_consume))
+    vau.compare_exchange_strong(one, 0, REL, memory_order_consume);
+
+  if (!vau.fetch_add(1, ACQ))
+    vau.fetch_add(-1, REL);
+
+  if (!vau.fetch_sub(1, ACQ))
+    vau.fetch_sub(-1, REL);
+
+#if 0 /* broken in underlying target */
+
+  if (!vau.fetch_and(1, ACQ))
+    vau.fetch_and(-1, REL);
+
+  if (!vau.fetch_or(1, ACQ))
+    vau.fetch_or(-1, REL);
+
+  if (!vau.fetch_xor(1, ACQ))
+    vau.fetch_xor(-1, REL);
+
+  if (!vau.fetch_nand(1, ACQ))
+    vau.fetch_nand(-1, REL);
+#endif
+
+  return 0;
+}