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Line 215: * Accessing read-only data stored in the program memory (flash) requires special LPM instructions; the flash bus is otherwise reserved for instruction memory. ~~Additionally, some~~Some chip-specific differences affect code generation. Code pointers (including return addresses on the stack) are two bytes long on chips with up to 128 KB of flash memory, but three bytes long on larger chips; not all chips have hardware multipliers; chips with over 8 KB of flash have branch and call instructions with longer ranges; and so forth. The mostly regular instruction set makes C (and even Ada) compilers fairly straightforward and efficient. [[GNU Compiler Collection\|GCC]] has included AVR support for quite some time, and that support is widely used. [[LLVM]] also has rudimentary AVR support. In fact, Atmel solicited input from major developers of compilers for small microcontrollers, to determine the instruction set features that were most useful in a compiler for high-level languages.<ref name="codesign" />

AVR microcontrollers: Difference between revisions