http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60598

--- Comment #4 from Richard Henderson <rth at gcc dot gnu.org> ---
Created attachment 32411
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=32411&action=edit
proposed patch

This appears to fix the bug.

This code has a distinctly weird look to it.  A doloop insn that doesn't
actually loop is the branch we were trying to reorganize.  If we'd used a
normal compare-and-branch sequence, we'd have been able to use a conditional
return here, avoiding the less than ideal branch-over-branch situation.

But that's clearly a different problem.

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