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Startup Code Variable Initialization Code Basic I/O Memory Allocation Optimizer General Optimizations 251-Specific Optimizations Options for Code Generation Global Register Coloring Segment Naming Conventions Segment Types Initialization Segments Function Symbols Parameter Passing Symbols Hardware Stack Calculating Stack Size Interfacing C Programs to Assembler Global Variables Function Parameters Passing in Memory Passing in Registers Function Return Values Using the SRC Directive Register Usage Overlaying Segments TINY Model XTINY Model SMALL Model XSMALL Model LARGE Model Data Storage Formats Bit Variables 1-Byte Scalars 2-Byte Scalars 4-Byte Scalars Floating-point Numbers Floating-point Errors Double Numbers Double Errors Absolute Memory Locations Absolute Access Macros Linker Location Controls The _at_ Keyword Debugging Error Messages Library Reference Appendix251-Specific Optimizations
| Optimization | Description |
|---|---|
| Case/Switch Optimizing | Any switch and case statements are optimized by using a jump table or string of jumps. |
| Data Overlaying | Data and bit segments of functions are identified as OVERLAYABLE and are overlaid with other data and bit segments by the L251 linker/locator. |
| Extended Access Optimizing | Constants and variables are included directly in operations. |
| Peephole Optimization | Complex operations are replaced by simplified operations when memory space or execution time can be saved as a result. |
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