參數(shù)資料
型號: 20726
英文描述: 3DNow!? Technology Manual AMD-K6 Processor Multimedia Technology
中文描述: 3DNow???技術(shù)手冊的AMD - K6處理器多媒體技術(shù)
文件頁數(shù): 21/120頁
文件大小: 1284K
代理商: 20726
Programming Considerations
15
20726D/0—January 2000
AMD-K6 MMX Enhanced Processor Multimedia Technology
Preliminary Information
The x86 opcode and the Mod R/M byte can also be followed by
an SIB byte. This byte is used to describe the Scale, Index and
Base forms of 32-bit addressing.
The format of the x86 instruction allows for certain prefixes to
be placed before each instruction. These prefixes indicate
different types of command overrides.
The MMX instructions follow these rules just like all the
current existing instructions. This allows for an easy
implementation into the x86 architecture. All of the rules that
apply to the x86 architecture apply to MMX instructions,
including accessing registers, memory, and I/O.
Most opcode prefixes can be utilized while using MMX
instructions. The following prefixes can be used with MMX
instructions:
I
The Segment Override prefixes (2Eh/CS, 36h/SS, 3Eh/DS,
26h/ES, 64h/FS, and 65h/GS) affect MMX instructions that
contain a memory operand.
The LOCK prefix (F0h) triggers an invalid opcode exception
(interrupt 6).
The Address Size Override prefix (67h) affects MMX
instructions that contain a memory operand.
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