[Bug rtl-optimization/46888] missed optimization of zero_extract with constant inputs

[pinskia at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46888

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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  Attachment #28428|0                           |1
        is obsolete|                            |

--- Comment #6 from Andrew Pinski <pinskia at gcc dot gnu.org> 2012-10-12 08:49:35 UTC ---
Created attachment 28431
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=28431
New patch

Still does not fix the ARM case but similar thing can be done for the three
combine case.  It does fix the mips case which I was looking into; though
really there should be only one insert and no shift.