[PATCH 2/8 v2] opensm/complib: define macros for for "if" statements with branch prediction hints
From: Yevgeny Kliteynik <hidden>
Date: 2012-09-11 15:25:49
Subsystem:
the rest · Maintainer:
Linus Torvalds
Defined "PT" and "PF" for "predict true" and "predict false" respectively. Signed-off-by: Yevgeny Kliteynik <redacted> --- include/complib/cl_types_osd.h | 14 +++++++++++++- 1 file changed, 13 insertions(+), 1 deletion(-)
diff --git a/include/complib/cl_types_osd.h b/include/complib/cl_types_osd.h
index ce1a452..2538913 100644
--- a/include/complib/cl_types_osd.h
+++ b/include/complib/cl_types_osd.h@@ -1,6 +1,6 @@ /* * Copyright (c) 2004-2009 Voltaire, Inc. All rights reserved. - * Copyright (c) 2002-2005 Mellanox Technologies LTD. All rights reserved. + * Copyright (c) 2002-2012 Mellanox Technologies LTD. All rights reserved. * Copyright (c) 1996-2003 Intel Corporation. All rights reserved. * * This software is available to you under a choice of one of two
@@ -64,6 +64,18 @@ BEGIN_C_DECLS #include <inttypes.h> #include <assert.h> #include <string.h> + +/* + * Branch prediction hints + */ +#if defined(HAVE_BUILTIN_EXPECT) +#define PT(exp) __builtin_expect( ((uintptr_t)(exp)), 1 ) +#define PF(exp) __builtin_expect( ((uintptr_t)(exp)), 0 ) +#else +#define PT(exp) (exp) +#define PF(exp) (exp) +#endif + #if defined (_DEBUG_) #define CL_ASSERT assert #else /* _DEBUG_ */
--
1.7.11.1
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