[Bug tree-optimization/59519] [4.9 Regression] ICE on valid code at -O3 on x86_64-linux-gnu in slpeel_update_phi_nodes_for_guard1, at tree-vect-loop-manip.c:486

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59519

--- Comment #8 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
(In reply to bin.cheng from comment #7)
> (In reply to Jakub Jelinek from comment #6)
> > Created attachment 31562 [details]
> > gcc49-pr59519.patch
> > 
> > I wonder if this isn't just a checking issue, the two PHI nodes created in
> > *new_exit_bb have the same argument, so I think it is just fine if the two
> > PHI results are used interchangeably, later optimization passes should
> > hopefully coalesce them into a single IV.
> 
> I tested one similar patch before.  It passed x86_64 bootstrap and normal
> regression test.  It failed some ada (also one go) cases if I ran regression
> test with "-O3" option.  The failures look like noise to me, which I am not
> sure about.  What's your test results?

I admit I haven't performed -O3 bootstrap but normal, saw no bootstrap failures
nor testsuite regressions.
I'll try to run make check with RUNTESTFLAGS='--target_board=unix/-O3'.