diff options
Diffstat (limited to 'libcpu')
| -rw-r--r-- | libcpu/aarch64/common/cpuport.c | 18 |
1 files changed, 17 insertions, 1 deletions
diff --git a/libcpu/aarch64/common/cpuport.c b/libcpu/aarch64/common/cpuport.c index 4c1bf01cf3..b2592c854d 100644 --- a/libcpu/aarch64/common/cpuport.c +++ b/libcpu/aarch64/common/cpuport.c @@ -40,4 +40,20 @@ int __rt_ffs(int value) #endif } -#endif /* RT_USING_CPU_FFS */
\ No newline at end of file +unsigned long __rt_ffsl(unsigned long value) +{ +#ifdef __GNUC__ + return __builtin_ffsl(value); +#else + if (!value) + { + return 0; + } + + __asm__ volatile ("rbit %0, %0" : "+r" (value)); + + return __rt_clz(value); +#endif +} + +#endif /* RT_USING_CPU_FFS */ |