Re: Emit more REG_EQUIV notes for function args (PR42235)

[Bernd Schmidt <bernds@codesourcery.com>]

On 07/14/2010 08:54 PM, Jeff Law wrote:
> In theory, given the REG_EQUIV note we ought to get an entry in
> reg_equiv_mem, which the code I'm working on knows it can use instead of
> shoving the pseudo into a stack slot.  Effectively, my code will
> rematerialize the argument from the equivalent memory location
> regardless of the number of uses.

Reload can do that already, I think, but it's not prepared to handle a
(zero_extend (mem)) inside a REG_EQUIV note.  That should be reasonably
trivial to add if the reg is never set other than in the initializing insn.


Bernd