[PATCH v2 3/3] Add ffsl(), ffsll(), fls(), flsl(), flsll()

[Sebastian Huber]

On 27/07/17 03:40, Kito Cheng wrote:

> I am testing with RISC-V with newlib/trunk and just hang on ffs,
> after investigate, I saw gcc just generate a ffs call in ffs for riscv64
> and I guess riscv64 is not the only target will hit this bug,
> so maybe we can revert the part of this patch, at least for ffs.c?

We should first investigate why GCC performs this optimization. The file 
is compiled with -fno-builtin, so it some other optimization. Maybe we 
need something like __attribute__ ((__optimize__ 
("-fno-tree-loop-distribute-patterns"))) as in string/local.h.

-- 
Sebastian Huber, embedded brains GmbH

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