4 Instruction tables - Agner Fog
4 Instruction tables - Agner Fog
4 Instruction tables - Agner Fog
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Pentium II and III<br />
a)<br />
Faster under certain conditions: see manual 3: "The microarchitecture of Intel,<br />
AMD and VIA CPUs".<br />
b) Has an implicit LOCK prefix.<br />
c) 3 if constant without base or index register<br />
d) P3 only.<br />
Floating point x87 instructions (Pentium Pro, II and III)<br />
<strong>Instruction</strong> Operands μops Latency Reciprocal<br />
p0 p1 p01 p2 p3 p4<br />
throughput<br />
FLD r 1<br />
FLD m32/64 1 1<br />
FLD m80 2 2<br />
FBLD m80 38 2<br />
FST(P) r 1<br />
FST(P) m32/m64 1 1 1<br />
FSTP m80 2 2 2<br />
FBSTP m80 165 2 2<br />
FXCH r 0 ⅓ f)<br />
FILD m 3 1 5<br />
FIST(P) m 2 1 1 5<br />
FLDZ 1<br />
FLD1 FLDPI FLDL2E etc. 2<br />
FCMOVcc r 2 2<br />
FNSTSW AX 3 7<br />
FNSTSW m16 1 1 1<br />
FLDCW m16 1 1 1 10<br />
FNSTCW m16 1 1 1<br />
FADD(P) FSUB(R)(P) r 1 3 1<br />
FADD(P) FSUB(R)(P) m 1 1 3-4 1<br />
FMUL(P) r 1 5 2 g)<br />
FMUL(P) m 1 1 5-6 2 g)<br />
FDIV(R)(P) r 1 38 h) 37<br />
FDIV(R)(P) m 1 1 38 h) 37<br />
FABS 1<br />
FCHS 3 2<br />
FCOM(P) FUCOM r 1 1<br />
FCOM(P) FUCOM m 1 1 1<br />
FCOMPP FUCOMPP 1 1 1<br />
FCOMI(P) FUCOMI(P) r 1 1<br />
FCOMI(P) FUCOMI(P) m 1 1 1<br />
FIADD FISUB(R) m 6 1<br />
FIMUL m 6 1<br />
FIDIV(R) m 6 1<br />
FICOM(P) m 6 1<br />
FTST 1 1<br />
FXAM 1 2<br />
FPREM 23<br />
FPREM1 33<br />
FRNDINT 30<br />
Page 67
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