[Bug target/87007] [8/9 Regression] 10% slowdown with -march=skylake-avx512

[hjl.tools at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87007

--- Comment #5 from H.J. Lu <hjl.tools at gmail dot com> ---
The current patch is posted at

https://gcc.gnu.org/ml/gcc-patches/2019-01/msg00298.html