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參數(shù)資料
| 型號(hào)： | 20726 |
| 英文描述： | 3DNow!? Technology Manual AMD-K6 Processor Multimedia Technology |
| 中文描述： | 3DNow??？技術(shù)手冊(cè)的AMD - K6處理器多媒體技術(shù) |
| 文件頁(yè)數(shù)： | 14/120頁(yè) |
| 文件大?。?/td> | 1284K |
| 代理商： | 20726 |
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AMD-K6 Processor Multimedia Technology
AMD-K6 MMX Enhanced Processor Multimedia Technology
20726D/0—January 2000
Preliminary Information
I
U
—Unsigned
SS
—Signed Saturation
US
—Unsigned Saturation
For example, the mnemonic for the PACK instruction that packs
four words into eight unsigned bytes is PACKUSWB. In this
mnemonic, the US designates an unsigned result with
saturation, and the WB means that the source is packed words
and the result is packed bytes.
I
I
The term
saturation
is commonly used in multimedia
applications. Saturation allows mathematical limits to be
placed on the data elements. If a result exceeds the boundary of
that data type, the result is set to the defined limit for that
instruction. A common use of saturation is to prevent color
wraparound.
Instruction Formats
All MMX instructions, except the EMMS instruction that uses
no operands, are formatted as follows:
INSTRUCTION mmreg1, mmreg2/mem64
The source operand (mmreg2/mem64) can be either an MMX
register or a memory location. The destination operand
(mmreg1) can only be an MMX register.
The MOVD and MOVQ instructions also have the following
acceptable formats:
MOVD
MOVD
MOVQ
mmreg1, mreg32/mem32
mreg32/mem32, mmreg1
mem64, mmreg1
In the first example, the source operand (mreg32/mem32) can
be either an integer register or a 32-bit memory address. The
destination operand (mmreg1) can only be an MMX register.
The second example has the source operand as an MMX
register. The destination operand (mreg32/mem32) can be
either an integer register or a 32-bit memory address. The third
example has the source operand as an MMX register and the
destination operand as a 64-bit memory location
The SHIFT instructions can also utilize an immediate source
operand. It is designated as
imm8
.
PSRLW
mmreg1, imm8
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