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authorMathias Agopian <mathias@google.com>2009-04-17 14:43:36 -0700
committerMathias Agopian <mathias@google.com>2009-04-17 14:43:36 -0700
commitb5fbd75f6c58558a430ce15d077eed0a5ae97d9d (patch)
treef4b9ecb1cd7b9cd0de7b0345b2bcb1fc8740e104 /include/cutils/compiler.h
parent61d8e487e65cba39a4ba98a8157e730f6db1a421 (diff)
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add a compiler.h to libcutils. it's intended to define compiler-dependent macros.
currently, it defines CC_LIKELY and CC_UNLIKELY.
Diffstat (limited to 'include/cutils/compiler.h')
-rw-r--r--include/cutils/compiler.h32
1 files changed, 32 insertions, 0 deletions
diff --git a/include/cutils/compiler.h b/include/cutils/compiler.h
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--- /dev/null
+++ b/include/cutils/compiler.h
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+/*
+ * Copyright (C) 2007 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ANDROID_CUTILS_COMPILER_H
+#define ANDROID_CUTILS_COMPILER_H
+
+/*
+ * helps the compiler's optimizer predicting branches
+ */
+
+#ifdef __cplusplus
+# define CC_LIKELY( exp ) (__builtin_expect( !!(exp), true ))
+# define CC_UNLIKELY( exp ) (__builtin_expect( !!(exp), false ))
+#else
+# define CC_LIKELY( exp ) (__builtin_expect( !!(exp), 1 ))
+# define CC_UNLIKELY( exp ) (__builtin_expect( !!(exp), 0 ))
+#endif
+
+#endif // ANDROID_CUTILS_COMPILER_H