 C166 User's Guide | |
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C166 User's Guide
C166 Introduction Compiling Programs Language Extensions Preprocessor Advanced Programming Error Messages Library Reference Appendix A. ANSI C Implementation
Implementation-defined Behavior Compiler-Related Library-Related B. Version Differences Version 4.0 Differences Version 3.0 Differences Version 2.6 Differences Version 2.0 Differences Version 1.0 Differences C. Writing Optimum Code Memory Model Variable Location Variable Size Automatic Variables Avoid far/huge Pointer Cast Optimum C16x Code Other Sources D. Compiler Limits Compiler Limitations OMF Limitations E. Byte Ordering F. Hints, Tips, and Techniques Using Interrupts Program Execution Using the PEC Stack Problems Using Monitor-166 Using the bdata Type Using TRAPS.CAutomatic Variables
The C166 Compiler attempts to maintain automatic variables in CPU registers. Since the C16x/ST10 microcontroller has 16 registers, several automatic variables can be located in registers. When determining which automatic variables to store in registers, the optimizer in the C166 Compiler gives priority to index variables used in for and while loops. The best results are achieved by using int or unsigned int variables.
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