Frustrated with dmd codegen bug

[Basile B.]

On Tuesday, 24 April 2018 at 20:44:12 UTC, H. S. Teoh wrote:
> 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 sorry to bring confusion but i've tested on linux x86_64. 
With dmd 2.079.1 and ~master (just updated it right now). Here 
for some reason -profile is always required to get the error :/