[Bug target/77476] New: [Regression 7] [AVX-512] illegal kmovb instruction on KNL

["babokin at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77476

            Bug ID: 77476
           Summary: [Regression 7] [AVX-512] illegal kmovb instruction on
                    KNL
           Product: gcc
           Version: 7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: babokin at gmail dot com
  Target Milestone: ---

Created attachment 39554
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=39554&action=edit
reproducer

> g++ -std=c++11 -O3 -march=knl -o out init.cpp driver.cpp func.cpp check.cpp hash.cpp -w
> sde -knl -- ./out
TID 0 SDE-ERROR: Executed instruction not valid for specified chip (KNL):
0x4022c6: kmovb ecx, k0
Image: ./out+0x22c6 (in multi-region image, region# 0)
Function: _Z3foov
Instruction bytes are: c5 f9 93 c8

> g++ --version
g++ (Revision=239971/svn-rev:239971/) 7.0.0 20160903 (experimental)
Copyright (C) 2016 Free Software Foundation, Inc.

This is a regression, which appeared between August 22 (rev 239643) and August
23 (rev 239673).