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Intel s/ mmx software#
The first situation, providing two different programs, is the easiest solution from a software development point of view. There are two ways to handle this problem - either provide two versions of the program, one with MMX support and one without (and let the user choose which program they wish to run), or the program can dynamically determine whether a processor supports the MMX instruction set and skip the MMX instructions if they are not available. While it's almost a given that any modern CPU your software will run on will support the MMX extended instruction set, there may be times when you want to write software that will run on a machine even in the absence of MMX instructions. Hence, it's a good idea to learn these instructions if you're going to write much assembly code.ฤก1.2 Determining if a CPU Supports the MMX Instruction Set Therefore, writing fast code that uses MMX instructions is mainly the domain of the assembly language programmer. The use of MMX instructions, while not completely limited to assembly language, is one area where assembly language truly shines since most high level languages do not make good use of MMX instructions except in library routines.
Intel s/ mmx how to#
In this chapter we will discuss the MMX Technology instructions and how to use them in your assembly language programs. Since the instruction set has been available for quite some time, you can probably use the MMX instructions without worrying about your software failing on many machines.
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Intel s/ mmx pro#
Earlier Pentiums (and CPUs prior to the Pentium) and the Pentium Pro do not have these instructions available. So later Pentiums, Pentium II, Pentium III, and Pentium IV processors all have the MMX instruction set. The introduction of the MMX instruction set allowed later Pentium processors to handle these multimedia tasks without these expensive digital signal processors (DSPs), thus lowering the cost of multimedia systems. Prior to the invention of the MMX enhancements, good quality multimedia systems required separate digital signal processors and special electronics to handle much of the multimedia workload 1. The end result was their multimedia extensions to the Pentium processor that Intel calls the MMX Technology Instructions. By studying several existing multimedia applications, developing lots of multimedia related algorithms, and through simulation, Intel developed 57 instructions that would greatly accelerate the execution of multimedia applications. While working on the Pentium and Pentium Pro processors, Intel was also developing an instruction set architecture extension for multimedia applications.