[Bug tree-optimization/54733] Missing opportunity to optimize endian independent load/store

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54733

Richard Guenther <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |missed-optimization
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2012-09-28
     Ever Confirmed|0                           |1

--- Comment #1 from Richard Guenther <rguenth at gcc dot gnu.org> 2012-09-28 10:47:44 UTC ---
Confirmed.  The original idea was to leverage the byte-swap pass for this.
First you need to extend that to work on a memory source (which it currently
does not handle), then you, in addition to detecting bswap, emit a word
load and detect the "noop" pattern which then skips bswap.  (the byte-swap
pass was also supposed to utilize the vector shuffle engine for non-bswap
shuffles).