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): 15/120頁
文件大?。?/td> 1284K
代理商: 20726
9
20726D/0—January 2000
AMD-K6 MMX Enhanced Processor Multimedia Technology
Preliminary Information
2
Programming
Considerations
This chapter describes considerations for programmers writing
operating systems, compilers, and applications that utilize
MMX instructions as implemented in the AMD-K6 MMX
enhanced processor.
Feature Detection
To use the AMD-K6 processor multimedia technology, the
programmer must determine if the processor supports them.
The CPUID instruction gives programmers the ability to
determine the presence of multimedia technology on the
processor. Software must first test to see if the CPUID
instruction is supported. For a detailed description of the
CPUID instruction, see the
AMD Processor Recognition
Application Note,
order# 20734.
The presence of the CPUID instruction is indicated by the ID
bit (21) in the EFLAGS register. If this bit is writable, the
CPUID instruction is supported. The following code sample
shows how to test for the presence of the CPUID instruction.
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