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authorLennart Poettering <lennart@poettering.net>2014-01-30 16:46:48 +0100
committerLennart Poettering <lennart@poettering.net>2014-01-30 16:47:18 +0100
commitec417ccc276f245382e1dc3c7b0599a878160193 (patch)
tree68927e83b77b0379e1f759859c25f4fc90548551 /src
parent50add2909c2e4b13a04d285b058b1c2270137656 (diff)
util: add u32ctz() call for determining ctz of uint32_t
Diffstat (limited to 'src')
-rw-r--r--src/shared/util.h12
1 files changed, 12 insertions, 0 deletions
diff --git a/src/shared/util.h b/src/shared/util.h
index 117855de81..e4de4728bd 100644
--- a/src/shared/util.h
+++ b/src/shared/util.h
@@ -743,7 +743,19 @@ static inline void _reset_umask_(struct _umask_struct_ *s) {
_saved_umask_.quit = true)
static inline unsigned u64log2(uint64_t n) {
+#if __SIZEOF_LONG_LONG__ == 8
return (n > 1) ? (unsigned) __builtin_clzll(n) ^ 63U : 0;
+#else
+#error "Wut?"
+#endif
+}
+
+static inline unsigned u32ctz(uint32_t n) {
+#if __SIZEOF_INT__ == 4
+ return __builtin_ctz(n);
+#else
+#error "Wut?"
+#endif
}
static inline bool logind_running(void) {