FABS
Usage: FABS Modifies flags: None
Clears the sign bit of ST(0) to create the absolute value of the operand.
Floating-Point Absolute Value
FABS ; D9 E1 [8086,FPU]
FABS computes the absolute value of ST0, by clearing the sign bit, and stores the result back in ST0.
EXAMPLE:
fabs