Intel 80286 Fstp ST2, Fstp BX.ADJUSTEDRPM, Fstp Totaldosage, Fstp Regsave SI, Fstsw Savestatus

PROGRAMMING NUMERIC APPLICATIONS

FSTP

Operands

ST(i) short-real long-real temp-real

FSTSW/

FNSTSW

Operands

2-bytes

FSTSW AX/

FNSTSWAX

Operands

AX

FSUB

Operands

//ST,ST(i)/ST(i),ST short-real long-real

Table 2-14. Instruction Set Reference Data (Cont'd.)

FSTP destination			Exceptions: 1,0, U, P
Store real and pop
Execution Clocks		Operand Word	Code
				Coding Example
Typical	Range	Transfers	Bytes
20	17-24	0	2	FSTP ST(2)
89	86-92	2	2-4	FSTP [BX].ADJUSTED_RPM
102	98-106	4	2-4	FSTP TOTAL_DOSAGE
55	52-58	5	2-4	FSTP REG_SAVE [SI]
FSTSW destination			Exceptions: None
Store status word
Execution Clocks		Operand Word	Code
				Coding Example
Typical	Range	Transfers	Bytes
15	12-18	1	2-4	FSTSW SAVE_STATUS
FSTSW AX			Exceptions: None
Store status word to AX
Execution Clocks		Operand Word	Code
				Coding Example
Typical	Range	Transfers	Bytes
	10-16	1	2	FSTSW AX
FSUB //source/destination,source			Exceptions: I, D, 0, U, P
Subtract real
Execution Clocks		Operand Word	Code
				Coding Example
Typical	Range	Transfers	Bytes
85	70-100	0	2	FSUB ST,ST(2)
105	90-120	2	2-4	FSUB BASE_VALUE
110	95-125	4	2-4	FSUB COORDINATE.X

FSUBP	FSUBP destination, source			Exceptions: I, D, 0, U, P
	Subtract real and pop
	Execution Clocks		Operand Word	Code
Operands					Coding Example
	Typical	Range	Transfers	Bytes
ST(i),ST	90	75-105	0	2	FSUBP ST(2),ST
			2-35