From: khizmax <libcds.dev@gmail.com>
Date: Sat, 2 Jul 2016 15:05:09 +0000 (+0300)
Subject: Added cds_likely/cds_unlikely macro
X-Git-Tag: v2.2.0~195
X-Git-Url: http://plrg.eecs.uci.edu/git/?p=libcds.git;a=commitdiff_plain;h=8f3e5dcc1710f1298d40098868a0fcc64683abbf

Added cds_likely/cds_unlikely macro
---

diff --git a/cds/compiler/clang/defs.h b/cds/compiler/clang/defs.h
index 4a84e3a0..7d271354 100644
--- a/cds/compiler/clang/defs.h
+++ b/cds/compiler/clang/defs.h
@@ -122,6 +122,11 @@
 #define CDS_DATA_ALIGNMENT(n)   __attribute__ ((aligned (n)))
 
 
+// likely/unlikely
+
+#define cds_likely( expr )   __builtin_expect( !!( expr ), 1 )
+#define cds_unlikely( expr ) __builtin_expect( !!( expr ), 0 )
+
 #include <cds/compiler/gcc/compiler_barriers.h>
 
 #endif // #ifndef CDSLIB_COMPILER_GCC_DEFS_H
diff --git a/cds/compiler/defs.h b/cds/compiler/defs.h
index 0e663c8f..34706435 100644
--- a/cds/compiler/defs.h
+++ b/cds/compiler/defs.h
@@ -65,6 +65,11 @@
 #   define CDS_EXPORT_API
 #endif
 
+#ifndef cds_likely
+#   define cds_likely( expr )   expr
+#   define cds_unlikely( expr ) expr
+#endif
+
 // Features
 #include <cds/compiler/feature_tsan.h>
 
diff --git a/cds/compiler/gcc/defs.h b/cds/compiler/gcc/defs.h
index e3c91e76..a6028cc6 100644
--- a/cds/compiler/gcc/defs.h
+++ b/cds/compiler/gcc/defs.h
@@ -97,6 +97,11 @@
 #   define CDS_DEPRECATED( reason ) __attribute__((deprecated( reason )))
 #endif
 
+// likely/unlikely
+
+#define cds_likely( expr )   __builtin_expect( !!( expr ), 1 )
+#define cds_unlikely( expr ) __builtin_expect( !!( expr ), 0 )
+
 #include <cds/compiler/gcc/compiler_barriers.h>
 
 #endif // #ifndef CDSLIB_COMPILER_GCC_DEFS_H