Column meaning

Dataset x86 instruction listings - x87 floating-point instructions - Original 8087 instructions

Type : text

Keywords : meaning

Dataset

Data row number Meaning
1 2 x − 1 {displaystyle 2^{x}-1}
2 Absolute value
3 Add
4 Add and pop
5 Load BCD
6 Store BCD and pop
7 Change sign
8 Clear exceptions
9 Compare
10 Compare and pop
11 Compare and pop twice
12 Decrement floating point stack pointer
13 Disable interrupts
14 Divide
15 Divide and pop
16 Divide reversed
17 Divide reversed and pop
18 Enable interrupts
19 Free register
20 Integer add
21 Integer compare
22 Integer compare and pop
23 Integer divide
24 Integer divide reversed
25 Load integer
26 Integer multiply
27 Increment floating point stack pointer
28 Initialize floating point processor
29 Store integer
30 Store integer and pop
31 Integer subtract
32 Integer subtract reversed
33 Floating point load
34 Load 1.0 onto stack
35 Load control word
36 Load environment state
37 Load environment state, 16-bit
38 Load log2(e) onto stack
39 Load log2(10) onto stack
40 Load log10(2) onto stack
41 Load ln(2) onto stack
42 Load π onto stack
43 Load 0.0 onto stack
44 Multiply
45 Multiply and pop
46 Clear exceptions, no wait
47 Disable interrupts, no wait
48 Enable interrupts, no wait
49 Initialize floating point processor, no wait
50 No operation
51 Save FPU state, no wait, 8-bit
52 Save FPU state, no wait, 16-bit
53 Store control word, no wait
54 Store FPU environment, no wait
55 Store FPU environment, no wait, 16-bit
56 Store status word, no wait
57 Partial arctangent
58 Partial remainder
59 Partial tangent
60 Round to integer
61 Restore saved state
62 Restore saved state
63 Save FPU state
64 Save FPU state, 16-bit
65 Scale by factor of 2
66 Square root
67 Floating point store
68 Store control word
69 Store FPU environment
70 Store FPU environment, 16-bit
71 Store and pop
72 Store status word
73 Subtract
74 Subtract and pop
75 Reverse subtract
76 Reverse subtract and pop
77 Test for zero
78 Wait while FPU is executing
79 Examine condition flags
80 Exchange registers
81 Extract exponent and significand
82 y · log2 x
83 y · log2 (x+1)