[Bug target/84786] [miscompilation] vunpcklpd accessing xmm16-22 targeting KNL

[kretz at kde dot org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84786

--- Comment #2 from Matthias Kretz <kretz at kde dot org> ---
Created attachment 43618
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43618&action=edit
unreduced testcase

Compile with `g++ -std=c++17 -O2 -march=knl -o knl-fail knl-fail.cpp`.
The function `Tests::operators_<Vc::v2::simd<double,
Vc::v2::detail::avx_abi<32> > >::run()` countains the invalid instructions.

% g++-7 --version
g++-7 (Ubuntu 7.2.0-1ubuntu1~16.04) 7.2.0