diff options
Diffstat (limited to 'include/qemu/host-utils.h')
| -rw-r--r-- | include/qemu/host-utils.h | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/include/qemu/host-utils.h b/include/qemu/host-utils.h index 81c9a754ae..2a32be4cc0 100644 --- a/include/qemu/host-utils.h +++ b/include/qemu/host-utils.h @@ -26,6 +26,7 @@ #define HOST_UTILS_H 1 #include "qemu/compiler.h" /* QEMU_GNUC_PREREQ */ +#include <string.h> /* ffsl */ #if defined(__x86_64__) #define __HAVE_FAST_MULU64__ @@ -237,4 +238,29 @@ static inline int ctpop64(uint64_t val) #endif } +/* glibc does not provide an inline version of ffsl, so always define + * ours. We need to give it a different name, however. + */ +#ifdef __GLIBC__ +#define ffsl qemu_ffsl +#endif +static inline int ffsl(long val) +{ + if (!val) { + return 0; + } + +#if QEMU_GNUC_PREREQ(3, 4) + return __builtin_ctzl(val) + 1; +#else + if (sizeof(long) == 4) { + return ctz32(val) + 1; + } else if (sizeof(long) == 8) { + return ctz64(val) + 1; + } else { + abort(); + } +#endif +} + #endif |