[Bug lto/49700] LTO compile time hog

[Joost.VandeVondele at pci dot uzh.ch]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49700

--- Comment #5 from Joost VandeVondele <Joost.VandeVondele at pci dot uzh.ch> 2011-07-12 10:17:54 UTC ---
(In reply to comment #3)
> Oh, so it's a sum ...
> 
> Well, the I suppose you run into the usual array-prefetching compile-time hog.
> Try -fno-prefetch-loop-arrays.

This seems to reduce the time by 5x. On a non-LTO run, this doesn't matter, but
I assume LTO makes more info available that triggers some action by that pass.