[Bug target/55583] Extended shift instruction on x86-64 is not used, producing unoptimal code

[glisse at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55583

--- Comment #5 from Marc Glisse <glisse at gcc dot gnu.org> 2013-04-01 13:45:33 UTC ---
Created attachment 29764
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=29764
Patch from comment #4

I apparently forgot to attach a patch when I posted comment #4. This is just to
show the idea, it doesn't handle many cases, and the length_immediate value was
randomly filled just to let it compile.