[Bug rtl-optimization/52573] [4.5/4.6/4.7/4.8 regression] regrename creates overlapping register allocations for output operands

[bernds at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52573

--- Comment #2 from Bernd Schmidt <bernds at gcc dot gnu.org> 2012-04-13 
13:02:03 UTC ---
     (expr_list:REG_DEAD (reg:SI 3 %d3 [236])
        (expr_list:REG_UNUSED (reg:SI 3 %d3 [236])

The REG_DEAD note is bogus and confuses the renamer. Only REG_UNUSED should be
on this insn.