[Bug target/52055] load of 64-bit pointer reads 64 bits even when only 32 are used

[ebotcazou at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52055

--- Comment #4 from Eric Botcazou <ebotcazou at gcc dot gnu.org> 2012-02-01 16:13:43 UTC ---
> So, shell we do this kind of shortening in fwprop instead?  If a MEM load has
> all uses subregged to a narrower mode, try to subreg it and adjust the callers?

This would be backward combining (a la REE) though, not forward propagating.