- then
implicitly address the
topmost ST(0),
while binary operations (FADD,
FMUL, FCOM, etc.)
implicitly address ST(0) and ST(1). The non-strict
stack model...
- C0+i Floating-point
multiply dst <- dst * src
FMUL m32 D8 /1 Yes Yes
FMUL m64 DC /1
FMUL st,st(i) D8 C8+i
FMUL st(i),st DC C8+i Floating-point
subtract dst...
- 2 fload_3 25 0010 0101 →
value load a
float value from
local variable 3
fmul 6a 0110 1010 value1, value2 →
result multiply two
floats fneg 76 0111 0110...
- floating-point unit. Some
instructions showed an
enormous improvement, most
notably FMUL, with up to 15
times higher throughput than in the 80486 FPU. The Pentium...
- pp =
Register pair, W, X, Y or Z y = Y/Z
register pair bit (0=Z, 1=Y) u =
FMUL(S(U))
signed with 0=signed or 1=unsigned s = Store/load bit (0=load, 1=store)...
- of the
Haswell microarchitecture,
released in
September 2014. Three-cycle
FMUL latency, 64
entry scheduler.
Formerly called Rockwell.
Skylake 14 nm microarchitecture...
-
Optional special feature. . . . . X0 8 21 X0 8 21 12-3-8 12-1-2-8 12-3-8 21
FMUL Floating Multiply Optional special feature. ) ) ) ) X0C84 X0C84 12-4-8...
-
fisubr fisubrp fld fld
fldcw fldenv fldl2e fldl2t fldlg2 fldln2
fldpi fldz
fmul fmulp fnclex fnint fnop
fnsave fnstenv fnstew fnstsw fpatan fprem fprem fptan...
- new instructions. Most 8087 ****embly
mnemonics begin with F, such as FADD,
FMUL, FCOM and so on,
making them
easily distinguishable from 8086 instructions...
- 4 07501 FSUB
Floating subtract: 4(Rn) ← 4(Rn) - (Rn), Rn ← Rn + 4 07502
FMUL Floating Multiply: 4(Rn) ← 4(Rn) × (Rn), Rn ← Rn + 4 07503 FDIV Floating...
