https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70405

            Bug ID: 70405
           Summary: -fcompare-debug failure with -mavx512f
           Product: gcc
           Version: 6.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: rtl-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: zsojka at seznam dot cz
  Target Milestone: ---
            Target: x86_64-pc-linux-gnu, i686-pc-linux-gnu

Created attachment 38087
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=38087&action=edit
reduced testcase

Compiler output:
$ x86_64-pc-linux-gnu-gcc -O -mavx512f -fcompare-debug testcase.c
x86_64-pc-linux-gnu-gcc: error: testcase.c: -fcompare-debug failure (length)

The generated assembly differs significantly.

Tested revisions:
trunk r234391 - FAIL
5-branch r234412 - OK

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