用在hcl中表示指令(參考版)
2025-01-24 15:41本頁(yè)面
【正文】 ]。 PIcode == IRET : pValM。amp。 – 23 – Processor SEQ Hardware (Review) ? Stages occur in sequence ? One operation in process at a time Instr uctionm em or yInstr uctionm em or yPCincrem entPCincrem entCCCC A LUA LUD atam em or yD atam em or yNe wPCrBdstE dstMALUAALUBM em .con tr olAdd rsrcA srcBr e a dw r i t eALUf un .Fet chDecodeExecuteM em oryW ri t e backd a t a o u tR egisterfileR egisterfileA BMEBchdstE dstM srcA srcBi cod e i f un rAPCv al C v al Pv al Bv al ADa tav al Ev al MPCne w PC– 24 – Processor Instruct ionm em oryInstruct ionm em oryPCinc rem entPCinc rem entCCCCA LUA LUDatam em oryDatam em oryPCrBdst E dst MALUAALUBM em .c ont rolAddrsrcA srcBr e a dw r i teALUf un.Fet chDeco deExec ut eM em or yW r i t e bac kd a ta o u tRegi sterfi leRegi sterfi leA BMEBc hdst E dst M srcA srcBicode if un rApBc h pValM pValC pValPpI c odePCv alC v alPv alBv alADat av alEv alMPCSEQ+ Hardware ? Still sequential implementation ? Reorder PC stage to put at beginning PC Stage ? Task is to select PC for current instruction ? Based on results puted by previous instruction Processor State ? PC is no longer stored in register ? But, can determine PC based on other stored information – 25 – Processor PC Computation Int pc= [ pIcode == ICALL : pValC。 1 : valP。 Bch : valC。 icode == IJXX amp。 bool mem_write = icode in { IRMMOVL, IPUSHL, ICALL }。t need address ]。 icode in { IPOPL, IRET } : valA。 – 17 – Processor Condition Set Bool set_cc = icode in { IOPL }。 1 : ALUADD。t need ALU ]。 icode in { IRET, IPOPL } : 4。 icode in { IIRMOVL, IRMMOVL, IMRMOVL } : valC。t need register ]。 1 : RNONE。 – 13 – Processor E Destination None R[%esp] ? valE Update stack pointer None R[rB] ? valE OPl rA, rB Writeback rmmovl rA, D(rB) popl rA jXX Dest call Dest ret Writeback Writeback Writeback Writeback Writeback Write back result R[%esp] ? valE Update stack pointer R[%esp] ? valE Update stack pointer int dstE = [ icode in { IRRMOVL, IIRMOVL, IOPL} : rB。 Don39。 icode in { IPOPL, IRET
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