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lang-cpp
"i"constraint is indeed missing from the avr-libc's Inline Assembler Cookbook. I added a link to the gcc documentation that lists it."i"constraint does not mean "integer"."i"specifies an immediate operand, which is the union of"n"(integral operand known at compile-time) and"s"symbolic operand known at link time. For example, addresses of variables in static storage are known at link time, thus"i"will work for them.