[llvm-dev] UTF-8 conversion speed

[Joerg Sonnenberger via llvm-dev]

On Wed, Oct 03, 2018 at 09:14:30AM +0100, Stephen Kelly via llvm-dev wrote:
> On 02/10/18 22:58, Friedman, Eli via llvm-dev wrote:
> > On 10/2/2018 2:27 PM, via llvm-dev wrote:
> > > At CPPcon last week, I saw a talk by Bob Steagall called
> > > "Fast Conversion From UTF-8 with C++, DFAs, and SSE Intrinsics."
> > > Part of this talk included data from a half-dozen or so conversion
> > > libraries... one of which was labeled "LLVM".
> > > 
> > > The LLVM converters were invariably the slowest.
> > 
> > UTF conversion is not on any hot paths, as far as I know, so nobody has
> > spent any time optimizing it.  If you're interested in the history of
> > the LLVM code, see https://reviews.llvm.org/rC68208 ; it's mostly
> > untouched since then, except for a few bugfixes.
> 
> Given
> 
>  https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=823100
> 
>  https://bugs.llvm.org/show_bug.cgi?id=32962
> 
> I think moving away from it should be encouraged, assuming use of that file
> can be removed.

That bug is clearly bogus. Whether the copyright indication is correct
is a separate question, but the claim of the PR is just wrong.

Joerg