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): 104/120頁
文件大?。?/td> 1284K
代理商: 20726
98
MMX Instruction Set
AMD-K6 MMX Enhanced Processor Multimedia Technology
20726D/0—January 2000
Preliminary Information
Functional Illustration of the PUNPCKHBW Instruction
In the following figure, the destination register is shown at the center to illustrate the
flow of data from the two source operands.
In the functional illustration of the PUNPCKHBW instruction, the 8-bit values from
mmreg1 are stored in the low-order 8 bits of the 16-bit result. The mmreg2/mem64
source operand is set to all zero bits so it can provide zero fill in the high-order 8 bits of
the 16-bit result. This is a method that can be used to expand unsigned 8-bit values
into unsigned 16-bit operands for subsequent processing that requires higher
precision.
Related Instructions
See the PACKSSWB instruction.
See the PACKUSWB instruction.
See the PSRAW instruction.
See the PUNPCKHDQ instruction.
See the PUNPCKHWD instruction.
See the PUNPCKLBW instruction.
See the PUNPCKLDQ instruction.
See the PUNPCKLWD instruction.
source mmreg2/mem64
destination mmreg1
source mmreg1
00h
00h
88h
00h
A8h
80h
00h
00h
00h
FEh
44h
06h
00h
00h
7Fh
00h
80h
A8h
00h
00h
44h
00h
88h
80h
63
63
63
0
0
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