[PATCH] Workaround for ffs() on LP64 targets

[Sebastian Huber]

On 27/07/17 10:29, Kito Cheng wrote:

> it's will make aarch64 gen worse code (compare to __builtin_ffs
> version) since aarch64 have clz, but I don't have better idea too...

Maybe we should add a defined(__riscv__). A count leading zeros 
instruction is quite common.

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