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Cx51 User's Guide

FLOATFUZZY Compiler Directive

Abbreviation FF
Arguments A number from 0-7.
Default FLOATFUZZY (3)
µVision Options — C51 — Bits to round for float compare.
Description 

The FLOATFUZZY directive specifies the number of bits rounded before comparing floating-point numbers. The default value of 3 specifies that the three least significant bits of a float value are rounded before the comparison.

Example 
C51 MYFILE.C FLOATFUZZY (2)

#pragma FF (0)