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[Bug target/70421] New: [5/6 Regression] wrong code with v16si vector and useless cast at -O -mavx512f


https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70421

            Bug ID: 70421
           Summary: [5/6 Regression] wrong code with v16si vector and
                    useless cast at -O -mavx512f
           Product: gcc
           Version: 6.0
            Status: UNCONFIRMED
          Keywords: wrong-code
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: zsojka at seznam dot cz
  Target Milestone: ---
            Target: x86_64-pc-linux-gnu

Created attachment 38106
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=38106&action=edit
reduced testcase

Output: (using emulation)
$ x86_64-pc-linux-gnu-gcc -O -mavx512f testcase.c
$ sde64 -- ./a.out 
00001010
Aborted

$ x86_64-pc-linux-gnu-gcc -v                     
Using built-in specs.
COLLECT_GCC=/repo/gcc-trunk/binary-latest/bin/x86_64-pc-linux-gnu-gcc
COLLECT_LTO_WRAPPER=/repo/gcc-trunk/binary-trunk-234469-checking-yes-rtl-df-nographite/bin/../libexec/gcc/x86_64-pc-linux-gnu/6.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: /repo/gcc-trunk//configure --enable-languages=c,c++
--enable-checking=yes,rtl,df --without-cloog --without-ppl --without-isl
--disable-libstdcxx-pch
--prefix=/repo/gcc-trunk//binary-trunk-234469-checking-yes-rtl-df-nographite
Thread model: posix
gcc version 6.0.0 20160324 (experimental) (GCC) 

Tested revisions:
trunk r234469 - FAIL
5-branch r234412 - FAIL
4_9-branch r234243 - OK

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