[Bug tree-optimization/81010] New: [8 regression] test case gcc.target/powerpc/pr56605.c fails starting with r248958

["seurer at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81010

            Bug ID: 81010
           Summary: [8 regression] test case gcc.target/powerpc/pr56605.c
                    fails starting with r248958
           Product: gcc
           Version: 8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: seurer at gcc dot gnu.org
  Target Milestone: ---

This only occurs on BE.

spawn -ignore SIGHUP /home/seurer/gcc/build/gcc-test2/gcc/xgcc
-B/home/seurer/gcc/build/gcc-test2/gcc/
/home/seurer/gcc/gcc-test2/gcc/testsuite/gcc.target/powerpc/pr56605.c
-fno-diagnostics-show-caret -fdiagnostics-color=never -O3 -mvsx -mcpu=power7
-fno-unroll-loops -fdump-rtl-loop2_doloop -ffat-lto-objects -S -o pr56605.s
PASS: gcc.target/powerpc/pr56605.c (test for excess errors)
FAIL: gcc.target/powerpc/pr56605.c scan-rtl-dump-times loop2_doloop
"\\(compare:CC \\(subreg:SI \\(reg:DI" 1