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double Errors

The C16x/ST10/XC16x does not contain an interrupt vector to trap floating-point errors. Therefore, your software must be prepared to respond to these error conditions.

In addition to the normal floating-point values, a double number can contain a binary error value. Binary error values are defined as a part of the IEEE standard and 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)

Note

  • The C166 library function _chkdouble_ allows you to quickly check the floating-point status of double numbers.
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