 C166 User's Guide | |
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C166 User's Guide
C166 Introduction Compiling Programs Language Extensions Preprocessor Advanced Programming Sections, Classes, and Groups
Special Sections Locating Sections Customization Files Startup Code STARTUP.A66 START167.A66 Basic I/O Memory Allocation TRAPS.C Optimizer Optimizer Options General Optimizations 80C166-Specific Optimizations Global Register Coloring DPP Registers Stacks System Stack User Stack Stack Sizes System Stack Size User Stack Size XBUS Memory and Peripherals On-chip XRAM XBUS Peripherals Interfacing C to Assembler Function Parameters Function Return Values Using the SRC Directive Register Usage Example Routines TINY Model SMALL Model COMPACT Model MEDIUM Model LARGE Model Data Storage Formats Bit Variables 1-byte Scalars 2-byte Scalars 4-byte Scalars float Scalars float Errors double Scalars double Errors near Pointers far Pointers huge Pointers xhuge Pointers Absolute Memory Access Absolute Access Macros Linker Location Controls Debugging Error Messages Library Reference AppendixGlobal Register Coloring
Global register coloring works across a complete application. When enabled, the linker generates a register definition file that contains a table of registers used by each function. The compiler uses this table to optimize register usage. Your project is re-compiled iteratively until no further register optimization is possible.
When global register coloring is enabled, compiler knows the registers used by each function. Registers that are not altered in external functions can be used to hold register variables. The code generated by the compiler requires less data and code space and executes faster.
To enable global register coloring, the REGFILE compiler directive and the REGFILE linker directive must be specified.
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