[lld] r303797 - Improve parallelism of ICF.

[Davide Italiano via llvm-commits]

On Wed, May 24, 2017 at 12:22 PM, Rui Ueyama via llvm-commits
<llvm-commits at lists.llvm.org> wrote:
> Author: ruiu
> Date: Wed May 24 14:22:34 2017
> New Revision: 303797
>
> URL: http://llvm.org/viewvc/llvm-project?rev=303797&view=rev
> Log:
> Improve parallelism of ICF.
>
> This is the only place we use threads for ICF. The intention of this code
> was to split an input vector into 256 shards and process them in parallel.
> What the code was actually doing was to split an input into 257 shards,
> process the first 256 shards in parallel, and the remaining one in serial.
>
> That means this code takes ceil(256/n)+1 instead of ceil(256/n) where n
> is the number of available CPU cores. The former converges to 2 while
> the latter converges to 1.
>
> This patches fixes the above issue.
>

Nice. Any impact on performances?

Thanks!

-- 
Davide

"There are no solved problems; there are only problems that are more
or less solved" -- Henri Poincare