计算机组成作业(题)

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1、1．ImmediatelyaftertheCPUexecutesaninstructionthatisneitherabranchnorajumpinstruction,theprogramcounter(a)remainsunchanged(b)isincrementedtopointtothefollowinginstruction(c)isincrementedbyone(d)hasavaluethatcannotbedeterminedwithoutfurtherinformation2．Theprogramcountercontains(a)thenumberoftim

2、esaprogramhasbeenexecuted(b)theaddressoftheCPUinstructionthatisabouttobeexecuted(c)theamountofmemoryaprogramiscurrentlyusing(d)thenumberofCPUinstructionsaprogramhasexecutedsofar3．Inonecomputer,thebyteswithaddressesA,A+1,A+2andA+3containtheinteger256,andthevariabledeclaredwithint*a;hasthevalue

3、A.Inadifferentcomputer,thebyteswithaddressesB,B+1,B+2andB+3alsocontaintheinteger256,andthevariabledeclaredwithint*bhasthevalueB.Whichofthefollowingarenecessarilytrue?I．ThecontentsofA+1areequaltothecontentsofB+1.II．ThecontentsofA+1areequaltothecontentsofB+2.III．*a==*b(a)Ionly(b)IIIonly(c)IIand

4、IIIonly(d)IandIIIonly4．Ajumpinstruction(a)changestheprogramcounteronlyifitsoperandisequaltozero(b)changesapointertopointtothenextelementofanarray(c)increasestheprogramcounter(d)unconditionallysetstheprogramcountertoitsoperand5．Abranchinstruction(a)setstheprogramcountertooneofmanypossiblevalue

5、s(b)unconditionallysetstheprogramcountertoitsoperand(c)setstheprogramcountertooneoftwopossiblevalues(d)increasestheprogramcounterbyafixedamount6．ACPUregisterisawordofCPUmemorythat(a)recordstheresultsofperiodicCPUdiagnostics(b)isautomaticallyloadedwhenaCPUinstructionreferstoawordofnormalmemory

6、(c)housesacriticalvariableforthedurationoftheexecutionofaprogram(d)isexplicitlyloadedandunloadedfromnormalmemorybycompiler-generatedinstructions7．Whichofthefollowingisagoodreason(aregoodreasons)toequiptheCPUwithsmallamountsoffastmemory?I．TomakethedesignofthecompilersimplerII．TomakesomeCPUinst

7、ructionssmallerIII．TomakesomeCPUinstructionsfaster(a)IIIonly(b)I,II,andIII(c)IIandIIIonly(d)IIonly8．Whichofthefollowingnumericaloperationsismostlikelytoleadtolossofprecision?(a)Integeraddition(b)Floating-pointmultiplication(c)Floating-pointad