Follow-up Comment #3, bug #37778 (project avr-libc):

Question is whether or not NOP should be allowed to be moved across
ordinary memory moves.

For SEI and CLI, for example, I think this is not wanted in general.

NOP is less intrusive than SEI / CLI, of course, but avr-gcc emits
__builtin_avr_nop() with a memory clobber:

http://gcc.gnu.org/viewcvs/trunk/gcc/config/avr/avr.md?revision=195151&view=markup#l5938


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