关键词: 超长指令字, 编译器, 分簇, 寄存器压力, 软件流水

Abstract: Register is one of the most valuable resources. Software pipelining could bring about register pressure while scheduling instruction of VLIW DSP, which would cause register spill and software pipelining suspension. In the past research, instruction clustering pay more attension on instruction parallelism, and pass the register pressure to register allocator. In this paper, the authors clustered instruction through runtime inspection of the register command pressure. This is a dynamic method, according to all the pressure of each clusters register, which can reduce register spill and improve the efficiency of the program.

Key words: Very Long Instruction Word (VLIW), compiler, clustering, register pressure, software pipelining