[Bug tree-optimization/84232] New: [8 regression] gcc.dg/tree-ssa/ssa-dom-cse-2.c fail

["andrey.y.guskov at intel dot com" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84232

            Bug ID: 84232
           Summary: [8 regression] gcc.dg/tree-ssa/ssa-dom-cse-2.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: ---

r257181 triggers this:

spawn -ignore SIGHUP /work/gcc/xgcc -B/work/gcc/
/source/gcc/testsuite/gcc.dg/tree-ssa/ssa-dom-cse-2.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 -O3 -fno-tree-fre -fno-tree-pre -fdump-tree-optimized
--param sra-max-scalarization-size-Ospeed=32 -S -o ssa-dom-cse-2.s
PASS: gcc.dg/tree-ssa/ssa-dom-cse-2.c (test for excess errors)
FAIL: gcc.dg/tree-ssa/ssa-dom-cse-2.c scan-tree-dump optimized "return 28;"

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