[Bug tree-optimization/83991] New: [8 regression] gcc.dg/vect/pr79347.c fail

[andrey.y.guskov at intel dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83991

            Bug ID: 83991
           Summary: [8 regression] gcc.dg/vect/pr79347.c fail
           Product: gcc
           Version: 8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: andrey.y.guskov at intel dot com
  Target Milestone: ---

r256888 triggers this:

spawn -ignore SIGHUP /work/gcc/xgcc -B/work/gcc/
/source/gcc/testsuite/gcc.dg/vect/pr79347.c
-B/work/x86_64-pc-linux-gnu/./libmpx/
-B/work/x86_64-pc-linux-gnu/./libmpx/mpxrt
-L/work/x86_64-pc-linux-gnu/./libmpx/mpxrt/.libs
-B/work/x86_64-pc-linux-gnu/./libmpx/
-B/work/x86_64-pc-linux-gnu/./libmpx/mpxwrap
-L/work/x86_64-pc-linux-gnu/./libmpx/mpxwrap/.libs -fno-diagnostics-show-caret
-fdiagnostics-color=never -msse2 -ftree-vectorize -fno-vect-cost-model
-fno-common -O2 -fdump-tree-vect-details -fdump-tree-vect-all -S -o pr79347.s
PASS: gcc.dg/vect/pr79347.c (test for excess errors)
FAIL: gcc.dg/vect/pr79347.c scan-tree-dump-not vect "Invalid sum of "

Option set:
-with-system-zlib --with-demangler-in-ld --with-fpmath=sse --enable-shared
--enable-host-shared --enable-clocale=gnu --enable-cloog-backend=isl
--enable-languages=c,c++,fortran,jit,lto -with-arch=silvermont
--with-cpu=silvermont