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Some of the features include:

  • ASXXXX and ASLINK, a Freeware, retargettable assembler and linker.

  • extensive MCU specific language extensions, allowing effective use of the
    underlying hardware.

  • a host of standard optimizations such as global sub expression elimination,
    loop optimizations (loop invariant, strength reduction of induction variables and
    loop reversing ), constant folding and propagation, copy propagation, dead code
    elimination and jump tables for 'switch' statements.

  • MCU specific optimisations, including a global register allocator.

  • adaptable MCU specific backend that should be well suited for other 8-bit MCUs

  • independent rule based peep hole optimizer.

  • a full range of data types: char (8 bits, 1 byte), short (16 bits, 2 bytes),
    int (16 bits, 2 bytes), long (32 bit, 4 bytes) and float (4 byte IEEE).

  • the ability to add inline assembler code anywhere in a function.

  • the ability to report on the complexity of a function to help decide what
    should be re-written in assembler.

  • a good selection of automated regression tests.


SDCC also comes with the source level debugger SDCDB, using the current version of Daniel's s51 simulator. (Currently not available on Win32 platforms).

SDCC was written by Sandeep Dutta and released under a GPL license. Since its initial release there have been numerous bug fixes and improvements. As of December 1999, the code was moved to SourceForge where all the "users turned developers" can access the same source tree. SDCC is constantly being updated with all the users' and developers' input.

AVR and gbz80 ports are no longer maintained.