[Bug rtl-optimization/60757] combine uses exponential time in nonzero_bits1 recursion

[amylaar at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60757

--- Comment #4 from Jorn Wolfgang Rennecke <amylaar at gcc dot gnu.org> ---
(In reply to Jorn Wolfgang Rennecke from comment #3)
> Created attachment 32544 [details]
> typescript with backtrace
> 
> It appears that some other epiphany patches I had in my tree I thought were
> unrelated are, in fact, also relevant.
> 
> The exact version I've been using can be retrieved with:
> 
> git clone git@github.com:adapteva/epiphany-gcc.git
> cd epiphany-gcc
> git checkout ee67b804bd922ddcc72695973bed4641ba29801c

P.S.: that version sits on branch epiphany-gcc-4.8, so it should be sufficient
to clone that branch.  And it's based on the gcc git mirror, so if you have
a git local repo with gcc git mirror contents, most of the objects should
already be there.