Table of Contents        Previous topic       Next topic       

MICROPROCESSOR INSTRUCTION REFERENCE->FCMP

Floating-Point Compare

Compatibility: ColdFire chips with a floating-point unit (FPU)

FPx - Source

    

Assembler Syntax:	FCMP.fmt <ea>,FPx
	FCMP.D FPy,FPx

Format: Byte (B), Word (W), Long (L), Single-precision (S), Double-precision (D)

Converts the source operand to double-precision (if necessary) and subtracts that number from the destination floating point data register.

Floating-Point Status Register:

N	Set if result is negative;else cleared
Z	Set if result is zero;else cleared
I	Set if result is infinity;else cleared
NAN	Set if result is a NAN;else cleared
BSUN	Always cleared
INAN	Set if either input is not-a-number; else cleared
IDE	Set if either input is a denormalised number; else cleared
OPERR	Always cleared
OVFL	Always cleared
UNFL	Always cleared
DZ	Always cleared
INEX	Set if either operand is denormalised and the operands are not exactly the same and the IDE exception is disabled; else cleared

    

	Allowable Addressing Modes

	Dn,FPn
	(An),FPn
	(An)+,FPn
	-(An),FPn
	(d16,An),FPn
	(d16,PC),FPn