SDCC 2.6.0

SDCC is a freeware, retargettable, optimizing ANSI-C compiler. The current version targets Intel 8051-based MCUs, the Zilog Z80, and the DS390. Targets for the Microchip PIC and Amtel AVR series are under development, and the compiler can be retargeted for other 8 bit MCUs or PICs.
The entire source code for the compiler is distributed under GPL. SDCC uses ASXXXX and ASLINK, a freeware, retargettable assembler & linker. SDCC has extensive MCU (8051)-specific language extensions, which lets it utilize the underlying hardware effectively.
SDCC includes a source-level debugger/simulator and can generate debug info for the NoICE debugger.
Main features:
- 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.
Enhancements:
- This release improves the compilers conformance to the C standard.
- Significant progress was also made on the PIC (both 14- and 16-bit) backends.
- For the 8051, SDCC has seen the addition of a new memory model, code banking, and bit variables.
- Numerous feature requests and bugfixes are included as well.