Kým to opravia bude fungovať multithreading na GCN5 v C++-kových programoch za pomoci gcc ;)
A to nebude tak skoro..

Supporting Quotes

Code Sourcery Posts New AMD Radeon GCN Port, Hoping To Mainline For GCC 9 Compiler
on 5 September 2018 at 08:16 AM EDT.

The company is hoping for this new AMD GCN port to land in time for the GCC 9 stable compiler release (GCC 9.1) due out around the end of Q1'2019.
https://www.phoronix.com/scan.php?page=news_item&px=AMD-GCC9-New-GCN-Port

This patch series contains the non-OpenACC/OpenMP portions of a port to
AMD GCN3 and GCN5 GPU processors. It's sufficient to build
single-threaded programs, with vectorization in the usual way. C and
Fortran are supported, C++ is not supported,
https://gcc.gnu.org/ml/gcc-patches/2018-09/msg00264.html

An Early Port Of GCC To AMD's GCN Architecture
on 22 September 2016
Longtime SUSE toolchain expert Jan Hubicka started a port of GCC to AMD GCN a few weeks back
https://www.phoronix.com/scan.php?page=news_item&px=GCC-For-AMD-GCN-Early

SUSE Developers Publish Radeon GCN Backend Code For GCC Compiler
16 March 2017 at 02:31
This GCN back-end for GCC is primarily focused on compute capabilities rather than compiling graphics shaders.
Hopefully we'll see the code mature to the point where it will be found in next year's GCC 8 release.
https://www.phoronix.com/scan.php?page=news_item&px=GCN-For-GCC-Branch

CodeSourcery Has Ported OpenMP / OpenACC To AMD GCN GPUs With GCC
10 May 2018
Andrew Stubbs of CodeSourcery has completed work on a GCN3/GCN5 port for running OpenMP/OpenACC offloaded kernels on the likes of AMD Fiji and Vega graphics cards

GCC compiler although for now rely upon LLVM for the AMDGPU Assembler and Linker support with there being no AMD GCN support currently in GNU Binutils.
https://www.phoronix.com/scan.php?page=news_item&px=CodeSourcery-AMD-GCN

Porting GCC to AMD GCN microarchitecture
Honza Hubička
SuSE ČR s.r.o
Prague
Joint work with Martin Jambor
GNU Cauldron 2016

AMD Graphics Core Next

First specification released in 2011, Generation 3 in 2015

Primarily designed for graphic cards, but with parallel
computation in mind

Similar to traditional CPUs (unlike the predecessors)
https://gcc.gnu.org/wiki/cauldron2016?action=AttachFile&do=view&target=P...