GXM datasheet(227/244 Pages) NSC

227 / 244 page

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Instruction Set (Continued)

FNOP No Operation

D9 D0

No Operation

FPATAN Function Eval: Tan-1(y/x)

D9 F3

ST(1) <--- ATAN[ST(1) / TOS]; then pop TOS

97 - 161

FPREM Floating Point Remainder

D9 F8

TOS <--- Rem[TOS / ST(1)]

82 - 91

FPREM1 Floating Point Remainder IEEE

D9 F5

TOS <--- Rem[TOS / ST(1)]

82 - 91

FPTAN Function Eval: Tan(x)

D9 F2

TOS <--- TAN(TOS); then push 1.0 onto stack

117 - 129

FRNDINT Round to Integer

D9 FC

TOS <--- Round(TOS)

10 - 20

FRSTOR Load FPU Environment and Register

DD [mod 100 r/m]

Restore state

56 - 72

FSAVE Save FPU Environment and Register

(9B)DD [mod 110 r/m]

Wait, then save state

57 - 67

FNSAVE Save FPU Environment and Register

DD [mod 110 r/m]

Save state

55 - 65

FSCALE Floating Multiply by 2n

D9 FD

TOS <--- TOS

× 2(ST(1))

7-14

FSIN Function Evaluation: Sin(x)

D9 FE

TOS <--- SIN(TOS)

76 - 140

FSINCOS Function Eval.: Sin(x)& Cos(x)

D9 FB

temp <--- TOS;

TOS <--- SIN(temp); then

push COS(temp) onto stack

145 - 161

FSQRT Floating Point Square Root

D9 FA

TOS <--- Square Root of TOS

59 - 60

FST Store FPU Register

TopofStack

DD [11010 n]

ST(n)<--- TOS

64-bit Real

DD [mod 010 r/m]

M.DR <--- TOS

32-bit Real

D9 [mod 010 r/m]

M.SR <--- TOS

FSTP Store FPU Register, Pop

Top of Stack

DB [1101 1 n]

ST(n) <--- TOS; then pop TOS

80-bit Real

DB [mod 111 r/m]

M.XR <--- TOS; then pop TOS

64-bit Real

DD [mod 011 r/m]

M.DR <--- TOS; then pop TOS

32-bit Real

D9 [mod 011 r/m]

M.SR <--- TOS; then pop TOS

FBSTP Store BCD Data, Pop

DF [mod 110 r/m]

M.BCD <--- TOS; then pop TOS

57 - 63

FIST Store Integer FPU Register

32-bit Integer

DB [mod 010 r/m]

M.SI <--- TOS

8 - 13

16-bit Integer

DF [mod 010 r/m]

M.WI <--- TOS

7 - 10

FISTP Store Integer FPU Register, Pop

64-bit Integer

DF [mod 111 r/m]

M.LI <--- TOS; then pop TOS

10 - 13

32-bit Integer

DB [mod 011 r/m]

M.SI <--- TOS; then pop TOS

8 - 13

16-bit Integer

DF [mod 011 r/m]

M.WI <--- TOS; then pop TOS

7 - 10

FSTCW Store FPU Mode Control Register

(9B)D9 [mod 111 r/m]

Wait Memory <--- Control Mode Register

FNSTCW Store FPU Mode Control Register

D9 [mod 111 r/m]

Memory <--- Control Mode Register

FSTENV Store FPU Environment

(9B)D9 [mod 110 r/m]

Wait Memory <--- Env. Registers

14 - 24

FNSTENV Store FPU Environment

D9 [mod 110 r/m]

Memory <--- Env. Registers

12 - 22

FSTSW Store FPU Status Register

(9B)DD [mod 111 r/m]

Wait Memory <--- Status Register

FNSTSW Store FPU Status Register

DD [mod 111 r/m]

Memory <--- Status Register

FSTSW AX Store FPU Status Register to AX

(9B)DF E0

Wait AX <--- Status Register

FNSTSW AX Store FPU Status Register to AX

DF E0

AX <--- Status Register

FSUB Floating Point Subtract

TopofStack

DC [11101 n]

ST(n)<--- ST(n) - TOS

4- 9

80-bit Register

D8 [1110 0 n]

TOS <--- TOS - ST(n

4 - 9

64-bit Real

DC [mod 100 r/m]

TOS <--- TOS - M.DR

4 - 9

32-bit Real

D8 [mod 100 r/m]

TOS <--- TOS - M.SR

4 - 9

FSUBP Floating Point Subtract, Pop

DE [1110 1 n]

ST(n) <--- ST(n) - TOS; then pop TOS

4 - 9

FSUBR Floating Point Subtract Reverse

TopofStack

DC [11100 n]

TOS <--- ST(n) - TOS

4- 9

80-bit Register

D8 [1110 1 n]

ST(n) <--- TOS - ST(n)

4 - 9

64-bit Real

DC [mod 101 r/m]

TOS <--- M.DR - TOS

4 - 9

32-bit Real

D8 [mod 101 r/m]

TOS <--- M.SR - TOS

4 - 9

FSUBRP Floating Point Subtract Reverse, Pop

DE [11100 n]

ST(n) <---TOS -ST(n); thenpop TOS

4 -9

Table 9-29. FPU Instruction Set Summary (Continued)

FPU Instruction

Opcode

Operation

Clock

Count

Notes

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