[llvm] 2461cdb - [CodeGen][SimplifyCFG] Teach DwarfEHPrepare to preserve DomTree

[Roman Lebedev via llvm-commits]

Fixed by f4ea21947d907c8730fef2be8fbad457f1d96a0e, thanks.

On Sat, Jan 2, 2021 at 2:43 PM Roman Lebedev <lebedev.ri at gmail.com> wrote:
>
> On Sat, Jan 2, 2021 at 1:54 PM Martin Storsjö <martin at martin.st> wrote:
> >
> > On Fri, 1 Jan 2021, Roman Lebedev via llvm-commits wrote:
> >
> > >
> > > Author: Roman Lebedev
> > > Date: 2021-01-02T01:01:19+03:00
> > > New Revision: 2461cdb41724298591133c811df82b0064adfa6b
> > >
> > > URL: https://github.com/llvm/llvm-project/commit/2461cdb41724298591133c811df82b0064adfa6b
> > > DIFF: https://github.com/llvm/llvm-project/commit/2461cdb41724298591133c811df82b0064adfa6b.diff
> > >
> > > LOG: [CodeGen][SimplifyCFG] Teach DwarfEHPrepare to preserve DomTree
> >
> > Hi,
> Hi!
>
> > This caused a notable compile time performance regression. With
> > https://martin.st/temp/libyuv-preproc.cpp compiled with "clang -target
> > x86_64-w64-mingw32 -w -c -O2", the compile time went from around 75
> > seconds to 145 seconds, almost doubling it.
> Yep, i can reproduce, will push the fix in a second.
>
> It's a very stupid bug. I guess i was even warned about this problem
> by my subconsciousness when writing commit message
> for 4b80647367950ba3da6a08260487fd0dbc50a9c5.
>
> > // Martin
> Roman