Evaluating the Bits of the Status Word with Floating- Point Instructions

Floating-point instructions affect the following bits in the status word: CC 1 and

CC 0, OV and OS.

The following tables show the signal state of the bits in the status word for the results of instructions with floating-point numbers (32 bits):

Valid Range for the Result	CC 1	CC 0	OV	OS
+0, -0 (zero)	0	0	0	*
-3.402823E+38 < result < -1.175494E-38 (negative number)	0	1	0	*
+1.175494E-38 < result < 3.402824E+38 (positive number)	1	0	0	*

*    The OS bit is not affected by the result of the instruction.

Invalid Range for the Result	CC 1	CC 0	OV	OS
Underflow -1.175494E-38 < result < - 1.401298E-45 (negative number)	0	0	1	1
Underflow +1.401298E-45 < result < +1.175494E-38 (positive number)	0	0	1	1
Overflow Result < -3.402823E+38 (negative number)	0	1	1	1
Overflow Result > 3.402823E+38 (positive number)	1	0	1	1
Not a valid floating-point number or illegal instruction (input value outside the valid range)	1	1	1	1