隨著多媒體技術的發展，影音格式的種類也越來越多，為了能夠處理多種影音格式，使用DSP (Digital Signal Processor)便成了最佳選擇。

除了硬體的時脈頻率(Clock frequency)之外，DSP的執行速度與其硬體架構，以及編譯器能否有效率的編譯程式有很大的關係，而上述兩點皆受到指令集(Instruction Set)很大的影響，在本篇中，將特別討論指令集與編譯器之間的關係。

Starfish是由清華大學、交通大學多位教授一起開發的低功率DSP，從指令集、編譯器，到整顆DSP，皆是由兩校的教授學生共同完成；在本篇中，將以Starfish為例子，分析不同編譯器對程式使用率的影響，以及執行H.264時為何有某些指令的使用率不高的情況發生。

As the multimedia technology development, there are more and more video/audio standards. In order to encode or decode different video/audio standards in one system, DSP (Digital Signal Processor) is a good choice to do video/audio process.

The speed of DSP is influenced much by the hardware architecture and the efficiency of compiling instructions, and both of them are decided when defining instruction set. In this paper, we profile the instruction usage with different compilers to analyze why some instructions are nearly used in H.264. We use the instruction set and compilers of Starfish DSP, which is developed by TsingHua University and ChiaoTung University to do our experiment.

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