[Bug rtl-optimization/47763] Useless initialization of register

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47763

Richard Guenther <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2011.02.16 11:04:15
     Ever Confirmed|0                           |1

--- Comment #8 from Richard Guenther <rguenth at gcc dot gnu.org> 2011-02-16 11:04:15 UTC ---
The difference is that with -funroll-loops the init_regs pass isn't presented
with

(insn 8 7 6 2 (clobber (reg:SI 59 [ <retval> ])) t.c:1 -1
     (nil))

and thus inserts a zero-initialization instruction.  I wonder whether
it could instead insert a clobber.