Cryptic bug for DMD v2.087.x

[Peter Jacobs]

On Monday, 12 August 2019 at 11:30:58 UTC, Nicholas Wilson wrote:
> On Monday, 12 August 2019 at 11:08:50 UTC, Peter Jacobs wrote:
>> Nicholas, thank you for looking.  Below is the transcript of 
>> compiling from within gdb.
>> [...]
>>> Program received signal SIGILL, Illegal instruction.
>> 0x000000000081df07 in xmmload(unsigned int, bool) ()
>> (gdb) backtrace
>> #0  0x000000000081df07 in xmmload(unsigned int, bool) ()
>
> Thanks, that corresponds to 
> https://github.com/dlang/dmd/blob/eda232a9f72b482c92cefb27a4321afc0aedbb5c/src/dmd/backend/cgxmm.d#L716-L717.
>
> So it would appear that you are trying (apparently successfully 
> with debug DMD (and LDC(?)) to use `real` with xmm somehow???
> I can't really help anymore without a reduced test case.

OK, I will see what I can do about a test case.  Also, I will go 
looking for places where we* might have used real variables or 
values.  I can think of the use of PI from the math module, for 
example.

Cheers,
Peter J.

* There are a few of us writing various parts of the flow solver 
code.