 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 Appendixfloat Errors
The C16x/ST10/XC16x does not contain an interrupt vector to trap floating-point errors. Therefore, your software must appropriately respond to these error conditions.
In addition to the normal floating-point values, a float number may contain a binary error value. These values are defined as a part of the IEEE standard and are used whenever an error occurs during normal processing of floating-point operations. Your code should check for possible arithmetic errors at the end of each floating-point operation.
| Name | Value | Meaning |
|---|---|---|
| NaN | 0xFFFFFFF | Not a number |
| +INF | 0x7F80000 | Positive infinity (positive overflow) |
| -INF | 0xFF80000 | Negative infinity (negative overflow) |
Note
- The C166 library function _chkfloat_ allows you to quickly check the floating-point status of float numbers.
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