http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50131
--- Comment #4 from Richard Guenther <rguenth at gcc dot gnu.org> 2011-08-21 
09:19:28 UTC ---
I'm sure or $-1,reg doesn't avoid the data dependence on reg and may even
result in hitting partial reg stall issues.  Surely xor reg,reg; not reg
might be another alternative?

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