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Technical Support
On-Line Manuals
C251 User's Guide
C251 Introduction
Compiling Programs
Language Extensions
Preprocessor
Advanced Programming
Customization Files
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
Appendix
C251 User's Guide
Optimizer
The C251 compiler is an optimizing compiler. This means that the compiler takes certain steps to ensure that the code that is generated and output to the object file is the most efficient (smaller and/or faster) code possible. The compiler analyzes the generated code to produce more efficient instruction sequences. This ensures that your C251 program runs as quickly as possible.
- General Optimizations
- 251-Specific Optimizations
- Options for Code Generation
- Global Register Coloring
The C251 compiler provides six different levels of optimizing. Each increasing level includes the optimizations of the levels below it. Refer to the OPTIMIZE directive for more information on the various optimization levels that are available.
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