 Cx51 User's Guide | |
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Cx51 User's Guide
Cx51 Introduction Compiling Programs Language Extensions Preprocessor Advanced Programming Customization Files
Startup Code Variable Initialization Code XBANKING.A51 Basic I/O Memory Allocation Optimizer Optimizer Options General Optimizations 8051-Specific Optimizations Global Register Coloring Segment Naming Conventions Data Objects Program Objects Parameters and Local Variables Interfacing C to Assembler Global Variables Function Parameters Passing in Memory Passing in Registers Function Return Values Using the SRC Directive Register Usage Overlaying Segments Small Model Example Compact Model Example Large Model Example Interfacing C programs to PL/M-51 Data Storage Formats Bit Variables 1-Byte Scalars 2-Byte Scalars 4-Byte Scalars Generic and Far Pointers Floating-point Numbers Floating-point Errors Absolute Memory Locations Absolute Access Macros Linker Location Controls The _at_ Keyword Debugging 8051 Derivatives Error Messages Library Reference AppendixOptimizer Options
- NOAREGS
Avoids absolute register addressing in the generated code. Programs generated with this directive are independent of the register bank. - NOREGPARMS
Avoids using registers for function parameters. Parameters are always passed in memory. Program code is compatible with earlier versions of the Keil compiler. - OPTIMIZE(SIZE)
Reduces program code by replacing common C operations (such as shift long) with subprograms. - OBJECTADVANCED
Inludes information in the object module for advanced linker optimizations (from the LX51 Linker only).
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