Hi Szikra, > So it is 2017, but the compiler still cannot optimize away bitwise or > zero... :( I think this is https://gcc.gnu.org/bugzilla/show_bug.cgi?id=41076 (which should be fixed in gcc 7 according to the comments). The fix contains a peephole optimization that I think catches exactly this case:
6831 (define_peephole2
6832 [(set (match_operand:QI 0 "register_operand")
6833 (const_int 0))
6834 (set (match_dup 0)
6835 (ior:QI (match_dup 0)
6836 (match_operand:QI 1
"register_operand")))]
6837 ""
6838 [(set (match_dup 0)
6839 (match_dup 1))])
https://gcc.gnu.org/viewcvs/gcc/trunk/gcc/config/avr/avr.md?r1=242907&r2=242906&pathrev=242907
Gr.
Matthijs
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