Frustrated with dmd codegen bug

[H. S. Teoh]

On Tue, Apr 24, 2018 at 08:18:55PM +0000, Basile B. via Digitalmars-d wrote:
> On Tuesday, 24 April 2018 at 18:53:02 UTC, H. S. Teoh wrote:
> > Yesterday afternoon I ran into a performance issue in one of my D
> > projects, and thought, "well, it's simple, just compile with
> > -profile, identify the hotspot, optimize".  Unfortunately, doing
> > that triggered a latent codegen bug in -O that randomly causes
> > runtime segfaults, basically halting all progress.  I spent all
> > morning today to reduce the code in order to identify the codegen
> > bug:
> > 
> > 	https://issues.dlang.org/show_bug.cgi?id=18794
> 
> In the report you forgot to mention that the bug is only visible with
> -O -profile.
> With just -O the provided test case works fine.

Really?! That's weird...  Originally the problem appeared with -O
-profile, but after reduction, I could reproduce the problem even
without -profile. (Just tested it again: the segfault happens without
-profile.)  Possibly it's affected by the OS/architecture?  Or perhaps
it's just very sensitive to the exact combination of flags +
environmental factors.


T

-- 
I'm still trying to find a pun for "punishment"...