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Cx51 User's Guide
Cx51 Introduction Compiling Programs Language Extensions Preprocessor Advanced Programming 8051 Derivatives Error Messages Library Reference 
Appendix A. ANSI C Implementation 
Implementation-defined Behavior Compiler-Related Library-Related B. Version Differences Version 6.0 Differences Version 5.0 Differences Version 4.0 Differences Version 3.4 Differences Version 3.2 Differences Version 3.0 Differences Version 2.0 Differences C. Writing Optimum Code Memory Model Variable Location Variable Size Unsigned Types Local Variables Other Sources D. Compiler Limits E. Byte Ordering F. Hints, Tips, and Techniques Recursive Code References Problems Using printf Uncalled Functions Using Monitor-51 Trouble with bdata Function PointersC. Writing Optimum Code
This section lists a number of ways you can improve the efficiency (i.e., smaller code and faster execution) of the code generated by the Cx51 Compiler. The following is by no means a complete list of things to try. In most cases, these suggestions improve the speed and reduce the code size of your program.
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