-/* Copyright (C) 2012 Free Software Foundation, Inc.
+/* Copyright (C) 2012-2015 Free Software Foundation, Inc.
Contributed by Richard Henderson <rth@redhat.com>.
This file is part of the GNU Transactional Memory Library (libitm).
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
<http://www.gnu.org/licenses/>. */
+#ifdef HAVE_SYS_AUXV_H
+#include <sys/auxv.h>
+#endif
+
namespace GTM HIDDEN {
typedef int v128 __attribute__((vector_size(16), may_alias, aligned(16)));
__asm volatile ("" : : : "memory");
}
+// Use HTM if it is supported by the system.
+// See gtm_thread::begin_transaction for how these functions are used.
+#if defined (__linux__) \
+ && defined (HAVE_AS_HTM) \
+ && defined (HAVE_GETAUXVAL) \
+ && defined (AT_HWCAP2) \
+ && defined (PPC_FEATURE2_HAS_HTM)
+
+#include <htmintrin.h>
+
+#define USE_HTM_FASTPATH
+
+#define _TBEGIN_STARTED 0
+#define _TBEGIN_INDETERMINATE 1
+#define _TBEGIN_PERSISTENT 2
+
+/* Number of retries for transient failures. */
+#define _HTM_RETRIES 10
+
+static inline bool
+htm_available (void)
+{
+ return (getauxval (AT_HWCAP2) & PPC_FEATURE2_HAS_HTM) ? true : false;
+}
+
+static inline uint32_t
+htm_init (void)
+{
+ // Maximum number of times we try to execute a transaction
+ // as a HW transaction.
+ return htm_available () ? _HTM_RETRIES : 0;
+}
+
+static inline uint32_t
+htm_begin (void)
+{
+ if (__builtin_expect (__builtin_tbegin (0), 1))
+ return _TBEGIN_STARTED;
+
+ if (_TEXASRU_FAILURE_PERSISTENT (__builtin_get_texasru ()))
+ return _TBEGIN_PERSISTENT;
+
+ return _TBEGIN_INDETERMINATE;
+}
+
+static inline bool
+htm_begin_success (uint32_t begin_ret)
+{
+ return begin_ret == _TBEGIN_STARTED;
+}
+
+static inline void
+htm_commit (void)
+{
+ __builtin_tend (0);
+}
+
+static inline void
+htm_abort (void)
+{
+ __builtin_tabort (0);
+}
+
+static inline bool
+htm_abort_should_retry (uint32_t begin_ret)
+{
+ return begin_ret != _TBEGIN_PERSISTENT;
+}
+
+/* Returns true iff a hardware transaction is currently being executed. */
+static inline bool
+htm_transaction_active (void)
+{
+ return (_HTM_STATE (__builtin_ttest ()) == _HTM_TRANSACTIONAL);
+}
+
+#endif
+
} // namespace GTM