[Bug tree-optimization/94300] [10 Regression] memcpy vector load miscompiled during const-prop since r10-6809-g7f5617b00445dcc8

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94300

Martin Liška <marxin at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|---                         |10.0
             Status|UNCONFIRMED                 |NEW
                 CC|                            |jakub at gcc dot gnu.org,
                   |                            |marxin at gcc dot gnu.org
      Known to work|                            |9.3.0
           Priority|P3                          |P1
   Last reconfirmed|                            |2020-03-24
            Summary|[10 Regression] memcpy      |[10 Regression] memcpy
                   |vector load miscompiled     |vector load miscompiled
                   |during const-prop           |during const-prop since
                   |                            |r10-6809-g7f5617b00445dcc8
     Ever confirmed|0                           |1
      Known to fail|                            |10.0

--- Comment #1 from Martin Liška <marxin at gcc dot gnu.org> ---
Confirmed, started with r10-6809-g7f5617b00445dcc8.
I can reproduce that on Intel SDE simulator:

$ g++ pr94300.c -O1 -march=skylake-avx512 &&
/home/marxin/Programming/intel-sde-new/sde-external-8.16.0-2018-01-30-lin/sde
-skx -- ./a.out 
Aborted (core dumped)