[Bug target/121416] [gcn][MI300][CDNA3] libgomp.oacc-c-c++-common/reduction-cplx-dbl.c produces wrong gang-reduction result

[ams at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121416

--- Comment #2 from Andrew Stubbs <ams at gcc dot gnu.org> ---
Let's look at why the atomic instructions that exist aren't working for us,
before we try to use the big dumb hammer fix (and does that solution *really*
work, if we don't understand the cache architecture properly?)