On 11/06/2014 01:00 PM, Richard Biener wrote:
Shouldn't we never hoist anything from a bb with lower execution frequency
to a bb with higher one? It seems LIM simply assumes that inside a loop
is always higher frequency than outside of it.
So - why artificially have that factor of 0.1 instead o
On Thu, Nov 6, 2014 at 7:08 PM, Pat Haugen wrote:
> It appears to me that both loop invariant motion passes (tree/rtl) don't
> look at basic block frequencies and will gladly hoist invariant code from a
> cold block within a loop. This can impact performance by executing (possibly
> costly) code t
It appears to me that both loop invariant motion passes (tree/rtl) don't
look at basic block frequencies and will gladly hoist invariant code
from a cold block within a loop. This can impact performance by
executing (possibly costly) code that would otherwise not be executed,
adds another regis
