4 Instruction tables - Agner Fog

AMD K7
Other
NOP (90) 1 0 1/3 ALU
Long NOP (0F 1F) 1 0 1/3 ALU
ENTER i,0 12 12 12
LEAVE 3 3
CLI 8-9 5
STI 16-17 27
CPUID 19-28 44-74
RDTSC 5 11
RDPMC 9 11
Arithmetic instructions
FADD(P),FSUB(R)(P) r/m 1 4 1 FADD
FIADD,FISUB(R) m 2 4 1-2 FADD,FMISC
FMUL(P) r/m 1 4 1 FMUL
FIMUL m 2 4 2 FMUL,FMISC
FDIV(R)(P) r/m 1 11-25 8-22 FMUL
Low values are
for round divisors
Page 11
3 ops, 5 clk if 16
bit
Floating point x87 instructions
Instruction Operands Ops Latency Reciprocal Execution Notes
Move instructions
throughput unit
FLD r 1 2 1/2 FA/M
FLD m32/64 1 4 1/2 FANY
FLD m80 7 16 4
FBLD m80 30 41 39
FST(P) r 1 2 1/2 FA/M
FST(P) m32/64 1 3 1 FMISC
FSTP m80 10 7 5
FBSTP m80 260 188
FXCH r 1 0 0.4
FILD m 1 9 1 FMISC
FIST(P) m 1 7 1 FMISC, FA/M
FLDZ, FLD1 1 1 FMISC
Low latency immediately
after
FCMOVcc st0,r 9 6 5 FMISC, FA/M FCOMI
FFREE r 1 1/3 FANY
FINCSTP, FDECSTP 1 0 1/3 FANY
Low latency immediately
after
FNSTSW AX 2 6-12 12 FMISC, ALU FCOM FTST
FSTSW AX 3 6-12 12 FMISC, ALU do.
FNSTSW m16 2 8 FMISC, ALU do.
FNSTCW m16 3 1 FMISC, ALU
faster if
FLDCW m16 14 42 FMISC, ALU unchanged