Analysis and design of X86 instruction compatible 32bit multiplier
兼容X86指令的32位乘法器的分析与设计*

Based on the study of various forms of multiply instruction on Intel X86 instruction set reference,proposed the potential types of micro instruction in need.Combine with the micro architecture of Longtium C2,made a compromise between the execution unit and the decoder unit,and took bypass logic into consideration,this paper demonstrated a 3-pipeline sign and no sign unified tree form multiplier,which met the requirements of different types of multiply instruction and different results valid occasions.By means of radix-4 Booth's method,with the analysis of the high bits of sign operands,the conventional 17 partial products wele reduced to 16,resulting of compact structure.In order to cut down the power of the multiplier consumed,some logic switches were employed to decrease the frequency of the circuits transition.