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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 AppendixDouble Errors
The 251 does not contain an interrupt vector to trap floating-point errors; therefore, your software must respond appropriately to these error conditions.
In addition to the normal floating-point values, a double 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 FFFFFFFF | Not a number |
| +INF | 0x7FF0000 00000000 | Positive infinity (positive overflow) |
| -INF | 0xFFF0000 00000000 | Negative infinity (negative overflow) |
The C251 library function _chkdouble_ allows you to quickly check floating-point status on double type numbers.
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