[llvm-dev] UTF-8 conversion speed (original) (raw)

Joerg Sonnenberger via llvm-dev llvm-dev at lists.llvm.org
Wed Oct 3 03:55:35 PDT 2018

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/showbug.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

More information about the llvm-dev mailing list