[Bug target/49781] Unnecessary lea in x32 mode

[hjl.tools at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49781

--- Comment #2 from H.J. Lu <hjl.tools at gmail dot com> 2011-07-19 13:06:19 UTC ---
(In reply to comment #1)
> (In reply to comment #0)
> 
> > Many lea insns can be combined with the load/store insn followed.
> 
> No, these are leal insns, they have inherent zero_extend from SImode and they
> clear upper 32bits before address is passed to load/store insn.

There are 2 ways to address this:

1. Use addr_32 prefix.
2. If address wrap-around is ignored, we can use the address as is.