A.3 Key to Instruction Flags
Given along with each instruction in this appendix is a set of flags,
denoting the type of the instruction. The types are as follows:
- 8086, 186, 286, 386, 486, PENT and P6 denote the lowest processor
type that supports the instruction. Most instructions run on all
processors above the given type; those that do not are documented.
The Pentium II contains no additional instructions beyond the P6
(Pentium Pro); from the point of view of its instruction set, it can
be thought of as a P6 with MMX capability.
- 3DNOW indicates that the instruction is a 3DNow! one, and will run
on the AMD K6-2 and later processors. ATHLON extensions to the
3DNow! instruction set are documented as such.
- CYRIX indicates that the instruction is specific to Cyrix
processors, for example the extra MMX instructions in the Cyrix
extended MMX instruction set.
- FPU indicates that the instruction is a floating-point one, and will
only run on machines with a coprocessor (automatically including
486DX, Pentium and above).
- KATMAI indicates that the instruction was introduced as part of the
Katmai New Instruction set. These instructions are available on the
Pentium III and later processors. Those which are not specifically
SSE instructions are also available on the AMD Athlon.
- MMX indicates that the instruction is an MMX one, and will run on
MMX-capable Pentium processors and the Pentium II.
- PRIV indicates that the instruction is a protected-mode management
instruction. Many of these may only be used in protected mode, or
only at privilege level zero.
- SSE and SSE2 indicate that the instruction is a Streaming SIMD
Extension instruction. These instructions operate on multiple values
in a single operation. SSE was introduced with the Pentium III and
SSE2 was introduced with the Pentium 4.
- UNDOC indicates that the instruction is an undocumented one, and
not part of the official Intel Architecture; it may or may not be
supported on any given machine.
- WILLAMETTE indicates that the instruction was introduced as part of
the new instruction set in the Pentium 4 and Intel Xeon processors.
These instructions are also known as SSE2 instructions.
- X64 indicates that the instruction was introduced as part of the
new instruction set in the x86-64 architecture extension, commonly
referred to as x64, AMD64 or EM64T.