Simplescalar Pipeline

1
Simplescalar Pipeline

• ?????? ???????
• ???

2
SimpleScalar Pipeline ?? 1
3
SimpleScalar Pipeline ?? 2

• Fetch
• ??? ??? ?? ??
• ????
• Dispatch
• ?? ???
• rename , ?????(RUU,LSQ)? ?? ????
• Scheduler
• ???? ??? ???? ?? ??
• Execute
• ?? ??
• ??? ?? ??

4
SimpleScalar Pipeline ?? 3

• Writeback
• ???? ??
• ???? ?? ??
• ???? ????? ? ?? ??? ??
• Commit
• ????? ?? ??? ??? ??? ???? ????? ??
• ??????? ?? ??

5
Sim-Outorder Pipetraces

• ???? ????? ???? ?? ???? ???
• -ptrace ltfilegt ltrangegt
• ltrangegt? ?? ???? ??? ??
• -ptrace foo.trc
• -ptrace foo.trc 1005000
• -ptrace foo.trc 1000
• pipeview.pl perl script? ?????
• pipeview.pl ltptrace_filegt

6
Sim-Outorder Pipetraces
7
Pipetrace ?? ?

• /edu/simplesim-3.0/sim-outorder -ptrace
  test.trc 20002250 -issueinorder -fetchifqsize
  1 -issuewidth 1 -commitwidth 1
  test.sssim-out38 SimpleScalar/PISA Tool Set
  version 3.0 of November, 2000..sim
  starting performance simulation 7sim
  simulation statistics sim_num_insn
  7300 total number of instructions
  committed..sim_total_insn
  7416 total number of instructions
  executedsim_total_refs 4117
  total number of loads and stores
  executedsim_total_loads 625
  total number of loads executedsim_total_stores
  3492.0000 total number of stores
  executedsim_total_branches 986
  total number of branches executedsim_cycle
  23500 total simulation time in
  cyclessim_IPC 0.3106
  instructions per cycle

8
Pipetrace ?? ?

• /edu/simplesim-3.0/pipeview.pl test.trc
• Instruction event legend
• - cache miss
• ! - TLB miss
• / - branch misprediction
• \ - branch misprediction detected
• - address generation execution
• _at_ 6373
• _at_ 6374
• tg 0x0040c178 addiu r8,r8,32'
• IF DA EX WB CT
• tg
  
• _at_ 6375
• th 0x0040c180 addiu r3,r3,-1'
• IF DA EX WB CT
• th tg

9
Pipetrace ?? ?

• _at_ 6376
• ti 0x0040c188 bne r3,r0,0xffffffa8'
• IF DA EX WB CT
• ti th tg
  
• _at_ 6377
• tj 0x0040c130 sw r7,0(r8)'
• IF DA EX WB CT
• tj ti th tg
  
• _at_ 6378
• tk 0x0040c130 internal ld/st'
• tl 0x0040c138 sw r7,-24(r2)'
• IF DA EX WB CT
• tl tj ti th
  tg
• tk