On Tue, 05 Sep 2017 00:36:34 -0700, n...@detonation.org wrote:
> A golfed version that reliably fails:
>
> {
> my Int $test-cont = 42;
> ⚛$test-cont;
> }
> {
> my atomicint $set = 0;
> start { sleep 1; $set ⚛= 1 };
> until ⚛$set { }
> }
>
> The important bit is the Int being read atomicly before reading the
> atomicint. The sleep makes it fail reliably.
And that in turn got it down to being a spesh bug (this golf reliably worked
with MVM_SPESH_DISABLE=1), which was that it mis-optimized the call to the
wrong multi candidate, due to some bogus logging. Fixed with
https://github.com/MoarVM/MoarVM/commit/5bf652edbb7f3eb067e0e753d945109282051c62
(though the spesh output it isn't too great, so I'll now see if I can do some
further tweaks to get it inlining the prefix:<⚛> for atomicint).
/jnthn
