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| 型號(hào)： | 20726 |
| 英文描述： | 3DNow!? Technology Manual AMD-K6 Processor Multimedia Technology |
| 中文描述： | 3DNow?。考夹g(shù)手冊(cè)的AMD - K6處理器多媒體技術(shù) |
| 文件頁(yè)數(shù)： | 9/120頁(yè) |
| 文件大?。?/td> | 1284K |
| 代理商： | 20726 |
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AMD-K6 Processor Multimedia Technology
3
20726D/0—January 2000
AMD-K6 MMX Enhanced Processor Multimedia Technology
Preliminary Information
multimedia applications. This performance increase is a direct
result of the increased multimedia bandwidth of the processor.
Multimedia applications must process large amounts of data.
Parallel data computing is exemplified by applications that
manipulate screen pixel information. Instead of acting on one
pixel at a time, multimedia technology enables the system to
act on multiple pixels simultaneously. This Single Instruction
Multiple Data (SIMD) model is a key feature of MMX
technology.
The AMD-K6 processor multimedia technology architecture
includes four new MMX data types, 57 new MMX instructions,
eight new 64-bit MMX registers, and an SIMD processing
pipeline. The multimedia technology is compatible with
existing x86 applications.
The 57 new MMX instructions include arithmetic functions,
packing and unpacking functions, logical operations, and
moves. These are the basic functions that are most commonly
used in repetitive computational multimedia programs.
Multimedia applications often use smaller operands—8-bit data
is commonly used for pixel information and 16-bit data is used
for audio samples. The new MMX registers allow data to be
packed into 64-bit operands. For example, 8-bit data (1 byte)
can be packed in sets of eight in a single 64-bit register, and all
eight bytes can be operated on simultaneously by a single MMX
instruction.
For 256-color video modes, this translates to computing eight
pixels per instruction. When an entire screen is being re-drawn,
these pixel manipulation routines often use highly repetitive
loops. Parallel processing of eight pieces of data can reduce the
processing time of a code loop by up to a factor of eight.
Multimedia applications frequently multiply and accumulate
data. The multimedia technology provides instructions that
add, multiply, and even combine these operations. For example,
the PMADDWD instruction can multiply and then add words of
data in a single instruction that uses far less processor cycles
than the equivalent x86 operations.
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