[Bug bootstrap/68404] [6 Regression] PGO/LTO bootstrap failure on ppc64le

[meissner at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68404

--- Comment #28 from Michael Meissner <meissner at gcc dot gnu.org> ---
I agree the 'fix' was a work around.  I think the real fix is to make the
addresses into normal addresses but I need some way of marking the address to
say this is ok as a fused address, but not as a normal non-fused address. 
However, such changes are not appropriate for stage4.

So I will come up with a patch to just disable -mcpu=power8 from turning fusion
on.  I did some tests recently on a power8, and fusion as it is currently
implemented does not help the Spec 2006 benchmarks all that much (most
benchmarks are the same speed or 1% slower, with perlbench being 2% slower if I
disable fusion).