[Bug target/58574] New: [4.9 Regression] Wrong code due to s390x machine reorg pass

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58574

            Bug ID: 58574
           Summary: [4.9 Regression] Wrong code due to s390x machine reorg
                    pass
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Keywords: wrong-code
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: jakub at gcc dot gnu.org
                CC: krebbel at gcc dot gnu.org

Created attachment 30928
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=30928&action=edit
scipy.C

The attached testcase is miscompiled with -O2 -march=z10 -m64 on s390x-linux.
foo function starts with:
        cfdbr   %r1,5,%f0
        clijle  %r1,93,.L70
.L68:
        larl    %r5,.L586
but doesn't initialize %r5 at all at label .L70 or after it (that is the
switch), while various cases use %r5.