68k Embedded Software Solutions

• Macraigor Wiggler

The Green Hills Optimizing Compiler for 68K uses a common code generator with architecture-specific optimizations. Each supported processor model has its own particular pipeline and instruction set characteristics. These are accommodated in the code generator to produce code best suited for the target processor. The following 68K specific features are supported:

• Use Built-in fp Functions—Uses built-in floating point instructions rather than calling library functions such as fabs(), sqrt(), and sin().
• Position Independent Code (PIC) and Data (PID)—Allows code and data to be created which can be placed anywhere in memory and still run correctly.
• Small Data Area (SDA)—The Green Hills Compilers can collect frequently accessed variables into a block of up to 64KB of memory. This enables efficient access to data within this block resulting in improved code size.
• Optimizing Assembler—Assembler will optimize branch and call instructions to use the smallest possible displacement reducing code size.

Run-time libraries
A comprehensive suite of run-time libraries for C, C++, EC++ and Ada are included in the corresponding compiler distributions for each language. Several different versions of the libraries are provided to accommodate different combinations of processor and memory models. The combinations include hardware vs. software floating point, big endian vs. little endian memory models and CPU specific versions. Full featured start-up code and libraries include automatic copy of data from ROM to RAM and system call emulation.