[Bug other/101201] New: [12 regression] test case gcc.target/powerpc/pr56605.c fails on BE after r12-1202

[seurer at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101201

            Bug ID: 101201
           Summary: [12 regression] test case gcc.target/powerpc/pr56605.c
                    fails on BE after r12-1202
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: other
          Assignee: unassigned at gcc dot gnu.org
          Reporter: seurer at gcc dot gnu.org
  Target Milestone: ---

g:9080a3bf23297885fdc47221da37a71d6dec93c5, r12-1202
make  -k check-gcc RUNTESTFLAGS="powerpc.exp=gcc.target/powerpc/pr56605.c"
FAIL: gcc.target/powerpc/pr56605.c scan-rtl-dump-times combine "\\(compare:CC
\\((?:and|zero_extend):DI \\(reg:[SD]I" 1
# of expected passes            1
# of unexpected failures        1

This only occurs on BE either power 7 or power 8.

commit 9080a3bf23297885fdc47221da37a71d6dec93c5
Author: Haochen Gui <guihaoc@gcc.gnu.org>
Date:   Fri Jun 4 14:38:53 2021 +0800

    rs6000: Disable mode promotion for pseudos