AMD K5

4-24 Performance
AMD-K5 Processor Technical Reference Manual 18524C/0—Nov1996
FSCALE 0_0x_11011001_111_xxx F
fpfill 1/2/8
fadd 1/2/8
FST real_32 0_1x_11011001_010_xxx M
ld 1/1
fpfill 1/2/4
fmv 1/2/4
st 1/2/5
FST ST(i) 0_0x_11011101_010_xxx F
fpfill 1/2/4
fmv 1/2/4
FSTP real_32 0_1x_11011001_011_xxx M
ld 1/1
fpfill 1/2/4
fmv 1/2/4
st 1/2/5
FSTP real_64 0_1x_11011101_011_xxx M
ld 1/1
ld 1/2
fpfill 1/2/4
fmv 1/2/4
st 2/3/5
st 2/4/6
FSTP real_80 0_1x_11011011_111_xxx M
ld 1/1
ld 1/2
fpfill 1/2/4
fmv 1/2/4
st 2/3/5
st 2/4/6
FSTP ST(i) 0_0x_11011x01_011_xxx F
fpfill 1/2/4
fmv 1/2/4
FSUB ST, ST(i) 0_0x_11011000_100_xxx F
fpfill 1/2/5
fadd 1/2/5
FSUB ST(i), ST 0_0x_11011100_100_xxx F
fpfill 1/2/5
fadd 1/2/5
FSUB real_32 0_1x_11011000_100_xxx F
ld 1/1
fpfill 1/3/6
fadd 1/3/6
FSUB real_64 0_1x_11011100_100_xxx M
ld 1/1
ld 1/2
fpfill 1/4/7
fadd 1/4/7
FSUBP ST(i), ST 0_0x_11011110_100_xxx F
fpfill 1/2/5
fadd 1/2/5
Table 4-3. Floating-Point Instructions (continued)
Instruction Mnemonic Opcode Format
Fastpath or
Microcoded
Execution
Unit Timing