[Bug tree-optimization/58444] New: [4.9 regression] Runfail on spec2006/434.zeusmp after r202516.

[ysrumyan at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58444

            Bug ID: 58444
           Summary: [4.9 regression] Runfail on spec2006/434.zeusmp after
                    r202516.
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: ysrumyan at gmail dot com

We found out that phase loop distribution is responsible for it, namely wrong
cfg is generated (after ldist) for pdv.f if it was compiled with options
-Ofast -funroll-loops -march=corei7

and we can see that 1st loop is duplicated (after __buitin_memcpy bb we see 1st
loop again).