[Bug rtl-optimization/46804] [4.5/4.6 Regression] gfortran.dg/char_cshift_2.f90 FAILs with -fregmove

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46804

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

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

--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> 2010-12-08 11:17:00 UTC ---
Ah, it seems Bernd committed a patch for this 9 years ago:
http://gcc.gnu.org/ml/gcc-patches/2001-06/msg01250.html
but probably had just testcase for REG_EQUIV and not REG_EQUAL, so didn't
discover that p at that point is not the p it wants, as there has been a
forward loop too.  I guess if the REG_EQUAL note is identical to the source
operand, it could be sign/zero extended instead of removing it, for anything
else of course we want to remove it, but from the right insn.