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

[crazylht at gmail dot com]

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

--- Comment #11 from Hongtao.liu <crazylht at gmail dot com> ---
https://gcc.gnu.org/viewcvs/gcc?view=revision&revision=275926

Author: liuhongt
Date:   Thu Sep 19 01:21:39 2019 UTC (30 seconds ago)
Changed paths:  4
Log Message:    
Extend pass rpad to handle avx512f vcvtusi2ss vcvtusi2ss
538.imagick_r improved by 4% with single copy run on SKYLAKE workstation.

gcc/
        * config/i386/i386.md
        (*floatuns<SWI48:mode><MODEF:mode>2_avx512):
        Add avx_partial_xmm_update.

gcc/testsuie
        * gcc.target/i386/pr87007-3.c: New test.