[Bug rtl-optimization/59880] ix86_avoid_lea_for_addr is buggy

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59880

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED
           Assignee|unassigned at gcc dot gnu.org      |jakub at gcc dot gnu.org

--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 31893
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=31893&action=edit
gcc49-pr59880.patch

Untested fix.  The reason for the problem is that if it is just a
(zero-extended SI->DI or normal) move from %r13, %rbp or (for k6 %esi), then
decomposition sets parts.disp to const0_rtx and thus we count it as two parts,
even when we wouldn't emit it as a lea insn originally.