[Bug tree-optimization/60930] [4.8/4.9/4.10 Regression] Wrong folding of - ((unsigned long long) a * (unsigned long long) (unsigned int)-1)

[wschmidt at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60930

--- Comment #4 from Bill Schmidt <wschmidt at gcc dot gnu.org> ---
Created attachment 32664
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=32664&action=edit
Proposed patch

Here's a patch (for trunk) that solves the problem for powerpc64le without
regression.  If you have time, can you please try this on the ports for which
the bug was reported?  Meantime I'll work on the backport versions.

Thanks,
Bill