Module: xenomai-3 Branch: wip/heap-bitmap Commit: fd914396b6474a107c3e174c7d0c7e0b40ab75ea URL: http://git.xenomai.org/?p=xenomai-3.git;a=commit;h=fd914396b6474a107c3e174c7d0c7e0b40ab75ea
Author: Philippe Gerum <r...@xenomai.org>
Date: Tue Jun 7 10:10:17 2016 +0200
boilerplate: provide count-leading/trailing-bits ops
---
include/boilerplate/compiler.h | 48 ++++++++++++++++++++++++++++++++++++++++
1 file changed, 48 insertions(+)
diff --git a/include/boilerplate/compiler.h b/include/boilerplate/compiler.h
index e558f73..0509e33 100644
--- a/include/boilerplate/compiler.h
+++ b/include/boilerplate/compiler.h
@@ -58,4 +58,52 @@
#define __deprecated __attribute__((__deprecated__))
#endif
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+void __invalid_operand_size(void);
+
+#define ctz(__v) \
+ ({ \
+ int __ret; \
+ if (!__v) \
+ __ret = sizeof(__v) * 8; \
+ else \
+ switch (sizeof(__v)) { \
+ case sizeof(int): \
+ __ret = __builtin_ctz((unsigned int)__v); \
+ break; \
+ case sizeof(long long): \
+ __ret = __builtin_ctzll(__v); \
+ break; \
+ default: \
+ __invalid_operand_size(); \
+ } \
+ __ret; \
+ })
+
+#define clz(__v) \
+ ({ \
+ int __ret; \
+ if (!__v) \
+ __ret = sizeof(__v) * 8; \
+ else \
+ switch (sizeof(__v)) { \
+ case sizeof(int): \
+ __ret = __builtin_clz((unsigned int)__v); \
+ break; \
+ case sizeof(long long): \
+ __ret = __builtin_clzll(__v); \
+ break; \
+ default: \
+ __invalid_operand_size(); \
+ } \
+ __ret; \
+ })
+
+#ifdef __cplusplus
+}
+#endif
+
#endif /* _BOILERPLATE_COMPILER_H */
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