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??？技術手冊的AMD - K6處理器多媒體技術
文件頁數(shù)： 12/120頁
文件大?。?/td> 1284K
代理商： 20726
6
AMD-K6 Processor Multimedia Technology
AMD-K6 MMX Enhanced Processor Multimedia Technology
20726D/0—January 2000
Preliminary Information
If there is a task switch when MMX applications are running
with older applications that do not include MMX instructions,
the MMX/FP register state is still saved automatically through
the int 7 handler.
Data Types
The AMD-K6 processor multimedia technology uses a packed
data format. The data is packed in a single, 64-bit MMX register
or memory operand as eight bytes, four words, or two double
words. Each byte, word, doubleword, or quadword is an integer
data type.
The form of an instruction determines the data type. For
example, the MOV instruction comes in two different forms—
MOVD moves 32 bits of data and MOVQ moves 64 bits of data.
The four new data types are defined as follows:
Packed byte
Eight 8-bit bytes packed into 64 bits
Signed integer range(–2
7
to 2
7
–1)
Unsigned integer range(0 to 2
8
–1)
Packed word
Four 16-bit words packed into 64-bits
Signed integer range(–2
15
to 2
15
–1)
Unsigned integer range(0 to 2
16
–1)
Packed
doubleword
Two 32-bit doublewords packed into 64 bits
Signed integer range(–2
31
to 2
31
–1)
Unsigned integer range(0 to 2
32
–1)
Quadword
One 64-bit quadword
Signed integer range(–2
63
to 2
63
–1)
Unsigned integer range(0 to 2
64
–1)
Figure 2 on page 7 shows the four new data types.
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