[PATCH][1/3][ARM] Keep ctz expressions together until after reload

[Joseph Myers]

On Thu, 26 May 2016, Kyrill Tkachov wrote:

> the early RTL optimisers.  This better expresses the semantics of the 
> operation as a whole, since the RBIT operation is represented as an 
> UNSPEC anyway and so will not see the benefits of combine,

This doesn't affect your patch, but I think it would make sense for RBIT 
not to be an UNSPEC but to have architecture-independent RTL and built-in 
function - see bug 50481.

-- 
Joseph S. Myers
joseph@codesourcery.com