Apple Microarchitecture Research by Dougall Johnson

M1/A14 P-core (Firestorm): Overview | Base Instructions | SIMD and FP Instructions
M1/A14 E-core (Icestorm):  Overview | Base Instructions | SIMD and FP Instructions

CMP (register, lsr, 32-bit)

Test 1: uops

Code:

  cmp w0, w1, lsr #17
  mov x0, 1
  mov x1, 2

(no loop instructions)

1000 unrolls and 1 iteration

Retires: 1.000

Issues: 2.000

Integer unit issues: 2.000

Load/store unit issues: 0.000

SIMD/FP unit issues: 0.000

retire uop (01)cycle (02)031e3f4c4d51schedule uop (52)schedule int uop (53)dispatch int uop (56)int uops in schedulers (59)606d6emap stall dispatch (70)flags prf full (73)map rewind (75)map stall (76)dispatch uop (78)map int uop (7c)map int uop inputs (7f)8283flush restart other nonspec (84)85inst all (8c)inst int alu (97)l1d cache writeback (a8)accfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)f5f6f7f8fd
100470950611000304252000200010004087717097094982135611000100020007097811100110000073222116842000710710710710710
100470960611000304252000200010004087707097094982135611000100020007097811100110000073122116842000710710710710710
100470950611000304252000200010004087707097094982535611000100020007097811100110000073122116842000710710710710710
100470950611000304252000200010004087707097094982135611000100020007097811100110000073122116842000710710710710710
100470950611000304252000200010004087707097094982535611000100020007097811100110000073122116842000710710710710710
100470950611000304252000200010004087707097094982535611000100020007097811100110000073122116842000710710710710710
100470960611000304252000200010004087707097094982535611000100020007097811100110000073122116842000710710710710710
100470960611000304252000200010004087717097094982135611000100020007097811100110000073122116842000710710710710710
1004709502111000304252000200010004087717097094982535611000100020007097811100110000073122116842000710710710710710
100470950611000304252000200010004087707097094982135611000100020007097811100110000073122116842000710710710710710

Test 2: Latency 3->1

Chain cycles: 1

Code:

  cmp w0, w1, lsr #17
  cset x0, cc
  mov x0, 1
  mov x1, 2

(fused SUBS/B.cc loop)

100 unrolls and 100 iterations

Result (median cycles for code, minus 1 chain cycle): 2.0035

retire uop (01)cycle (02)03mmu table walk data (08)091e3f4c4d51schedule uop (52)schedule int uop (53)dispatch int uop (56)int uops in schedulers (59)60696a6d6emap stall dispatch (70)map rewind (75)map stall (76)dispatch uop (78)map int uop (7c)map int uop inputs (7f)8283flush restart other nonspec (84)85inst all (8c)inst branch (8d)inst branch taken (90)inst branch cond (94)inst int alu (97)9fld unit uop (a6)l1d cache writeback (a8)a9acbranch cond mispred nonspec (c5)branch mispred nonspec (cb)cdcfd0d5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? int retires (ef)f5f6f7f8fd
202043003522500061100002989925301003010020107195624014926955300353003527391627487201072022430236300351451120201100991002010010100000011113180116112998130000101003003630036300363003630036
202043003522400061100002989925301003010020107195624014926955300353003527391627487201072022430236300351451120201100991002010010100000011113180116112998130000101003003630036300363003630036
202043003522500061100002989925301003010020107195624004926955300353003527391627487201072022430236300351451120201100991002010010100000011113180116112998130000101003003630036300363003630036
202043003522500061100002989925301003010020107195624004926955300353003527391627487201072022430236300351451120201100991002010010100000011113180116112998130000101003003630036300363003630036
202043003522500061100002989925301003010020107195619804926955300353003527369327478201002020030200300351451120201100991002010010100000000013101231222995430000101003003630036300363003630036
202043003522500061100002989325301003010020100195619804926955300353003527369327478201002020030200300351451120201100991002010010100000000013101231222995430000101003003630036300363003630036
202043003522400061100002989325301003010020100195619804926955300353003527369327478201002020030200300351451120201100991002010010100000000013101231222995430000101003003630036300363003630036
2020430035225001282100002989325301003010020100195619804926955300353003527369327478201002020030200300351451120201100991002010010100000000013101231222995430000101003003630036300363003630036
202043003522500061100002989325301003010020100195619804926955300353003527369327478201002020030200300351451120201100991002010010100000000013101331222995430000101003003630036300363003630036
2020430035225000726100002989325301003010020100195619804926955300353003527369327478201002020030200300351451120201100991002010010100000000013101231222995430000101003003630036300363003630036

1000 unrolls and 10 iterations

Result (median cycles for code, minus 1 chain cycle): 2.0035

retire uop (01)cycle (02)03091e3f4c4d51schedule uop (52)schedule int uop (53)dispatch int uop (56)int uops in schedulers (59)60696a6d6emap stall dispatch (70)map rewind (75)map stall (76)dispatch uop (78)map int uop (7c)map int uop inputs (7f)8283flush restart other nonspec (84)85inst all (8c)inst branch (8d)inst branch taken (90)inst branch cond (94)inst int alu (97)9fl1d cache writeback (a8)a9accfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? int retires (ef)f5f6f7f8fd
200243003522500611000029891253001030010200101956289149269553003530035273913274982001020020300203003514511200211091020010100100001270133112995830000100103003630036300363003630036
200243003522500611000029891253001030010200101956289149270913003530035273913274982001020020300203003514511200211091020010100100001270133112995830000100103003630036300363003630036
200243003522500611000029891253001030010200101956289149269553003530035273913274982001020020300203003514511200211091020010100100001270133212995830000100103003630036300363003630036
200243003522500611000029891253001030010200101956289149269553003530035273913274982001020020300203003514511200211091020010100101001270133112995830000100103003630036300363003630036
200243003522500611000029891253001030010200101956289149269553003530035273913274982001020020300203003514511200211091020010100102001270133112995830000100103003630036300363003630036
2002430035225012611000029891253005630010200101956289149269553003530035273913274982001020020300203003514511200211091020010100100001270133112995830000100103003630036300363003630036
200243003522500611000029891253001030010200101956289149270893003530035273913274982001020020300203003514511200211091020010100100001270133122995830000100103003630036300363003630036
200243003522500611000029891253001030010200101956289149269553003530035273913274982001020020300203003514511200211091020010100100001270133512995830000100103003630036300363003630036
20024300352250211261000029891253001030010200101956289149269553003530035273913274982001020020300203003514511200211091020010100100001270133112995830000100103003630036300363003630036
200243003522500611000029891253001030010200101956289149269553003530035273913274982001020020300203003514511200211091020010100100001270133212995830000100103003630036300363003630036

Test 3: Latency 3->2

Chain cycles: 1

Code:

  cmp w0, w1, lsr #17
  cset x1, cc
  mov x0, 1
  mov x1, 2

(fused SUBS/B.cc loop)

100 unrolls and 100 iterations

Result (median cycles for code, minus 1 chain cycle): 2.0035

retire uop (01)cycle (02)031e3f4c4d51schedule uop (52)schedule int uop (53)dispatch int uop (56)int uops in schedulers (59)60696a6b6d6emap stall dispatch (70)map rewind (75)map stall (76)dispatch uop (78)map int uop (7c)map int uop inputs (7f)8283flush restart other nonspec (84)85inst all (8c)inst branch (8d)inst branch taken (90)inst branch cond (94)inst int alu (97)9fl1d cache writeback (a8)accfd0d5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? int retires (ef)f5f6f7f8fd
202043003522506110000298932530100301002010019561981492695503003530035273693274782010020200302003003514511202011009910020100101000013101431222995430000101003003630036300363003630036
202043003522506110000298932530100301002010019561981492695503003530035273693274782010020200302003003514511202011009910020100101000013101231222995430000101003003630036300363003630036
202043003522506110000298932530100301002010019569220492695503003530035273693274782010020200302003003514511202011009910020100101000013101231222995430000101003003630036300363003630036
202043003522506110000298932530100301002010019561980492695503003530035273693274782010020200302003003514511202011009910020100101000013101331222995430000101003003630036300363003630036
202043003522506110000298932530100301002010019561980492695503003530035273693274782010020200302003003514511202011009910020100101000013101231222995430000101003003630036300363003630036
202043003522506110000298932530100301002010019561980492695503003530035273693274782010020200302003003514511202011009910020100101000013101331222995430000101003003630036300363003630036
202043003522508210000298932530100301002010019561980492695503003530035273693274782010020200302003003514511202011009910020100101000013101231222995430000101003003630036300363003630036
2020430035225067810000298932530100301002010019561980492695503003530035273693274782010020200302003003514511202011009910020100101000013101331222995430000101003003630036300363003630036
202043003522506110000298932530100301002010019561980492695503003530035273693274782010020200302003003514511202011009910020100101000013101231222995430000101003003630036300363003630036
2020430035225074710000298932530100301002010019561980492695503003530035273693274782010020200302003003514511202011009910020100101000013101331222995430000101003003630036300363003630036

1000 unrolls and 10 iterations

Result (median cycles for code, minus 1 chain cycle): 2.0035

retire uop (01)cycle (02)031e3f4c4d51schedule uop (52)schedule int uop (53)dispatch int uop (56)int uops in schedulers (59)5f60696a6d6emap stall dispatch (70)map rewind (75)map stall (76)dispatch uop (78)map int uop (7c)map int uop inputs (7f)8283flush restart other nonspec (84)85inst all (8c)inst branch (8d)inst branch taken (90)inst branch cond (94)inst int alu (97)9fl1d cache writeback (a8)accfd5map dispatch bubble (d6)d9dadbddfetch restart (de)e0? int output thing (e9)eb? int retires (ef)f5f6f7f8fd
200243003522506110000298912530010300102001019562891149269553003530035273913274982001020020300203003514511200211091020010100100012701330001229958300000100103003630036300363003630036
200243003522506110000298912530010300102001019562890149269553003530035273913274982001020020300203003514511200211091020010100100012702330001129958300000100103003630036300363003630036
200243003522406110000298912530010300102001019562890149269553003530035273913274982001020020300203003514511200211091020010100100012701330001129958300000100103003630036300363003630036
200243003522406110000298912530010300102001019562890149269553003530035273913274982001020020300203003514511200211091020010100100012701330001129958300000100103003630036300363003630036
200243003523306110000298912530010300102001019562890149269553003530035273913274982001020020300203003514511200211091020010100100012701330001229958300000100103003630036300363003630036
200243003522506110000298912530010300102001019562890149269553003530035273913274982001020020300203003514511200211091020010100100012702330001129958300000100103003630036300363003630036
200243003522506110000298912530010300102001019562890149269553003530035273913274982001020020300203003514511200211091020010100100012701330001129958300000100103003630036300363003630036
200243003522506110000298912530010300102001019562890149269553003530035273913274982001020020300203003514511200211091020010100100012701330001129958300000100103003630036300363003630036
200243003522506110000298912530010300102001019562890149269553003530035273913274982001020020300203003514511200211091020010100100012702330001129958300000100103003630036300363003630036
200243003522506110000298912530010300102001019562890149269553003530035273913274982001020020300203003514511200211091020010100100012701170001129958300000100103003630036300363003630036

Test 4: throughput

Count: 8

Code:

  cmp w0, w1, lsr #17
  cmp w0, w1, lsr #17
  cmp w0, w1, lsr #17
  cmp w0, w1, lsr #17
  cmp w0, w1, lsr #17
  cmp w0, w1, lsr #17
  cmp w0, w1, lsr #17
  cmp w0, w1, lsr #17
  mov x0, 1
  mov x1, 2

(fused SUBS/B.cc loop)

100 unrolls and 100 iterations

Result (median cycles for code divided by count): 0.6676

retire uop (01)cycle (02)03mmu table walk data (08)l2 tlb miss data (0b)1e3f4c4d51schedule uop (52)schedule int uop (53)dispatch int uop (56)int uops in schedulers (59)60696a6d6emap stall dispatch (70)flags prf full (73)map rewind (75)map stall (76)dispatch uop (78)map int uop (7c)map int uop inputs (7f)8283flush restart other nonspec (84)85inst all (8c)inst branch (8d)inst branch taken (90)inst branch cond (94)inst int alu (97)9fl1d cache writeback (a8)a9accfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? int retires (ef)f5f6f7f8fd
8020453456400000618000048741251601001601008010034400051495033053410534104329820603433608010080200160200534107811802011009910080100100000511022411533921600001005341153411534115341153411
8020453410400000618000048741251601001601008010034400051495033053410534104329820603433608010080200160200534107811802011009910080100100000511012421533921600001005341153411534115341153411
8020453410400110618000048741251601001601008010034400050495033053410534104329820633433608010080200160200534107811802011009910080100100000511012411533921600001005341153411534115341153411
8020453410399000618000048741251601001601008010034400050495033053410534104329820633433608010080200160200534107811802011009910080100100000511012411533921600001005341153411534115341153411
8020453410400000618000048741251601001601008010034400050495033053410534104329820503433608010080200160200534107811802011009910080100100000511012411533921600001005341153411534115341153411
8020453410399000618000048741251601001601008010034400050495033053410534104329820503433608010080200160200534107811802011009910080100100000511012411533921600001005341153411534115341153411
8020453410400000618000048741251601001601008010034400050495033053410534104329820503433608010080200161066534107811802011009910080100100000511012411533921600001005341153411534115341153411
8020453410400000618000048741251601001601008010034400050495033053410534104329820633433608010080200160200534107811802011009910080100100000511012410533921600001005341153411534115345753411
8020453410400000618000048741251601001601008010034400050495033053410534104329820633433608010080200160200534107811802011009910080100100000511012411533921600001005341153411534115341153411
8020453410400000618000048741251601001601008010034400050495033053410534104329820503433608010080200160200534107811802011009910080100100000511012411533921600001005341153411534115341153411

1000 unrolls and 10 iterations

Result (median cycles for code divided by count): 0.6673

retire uop (01)cycle (02)03mmu table walk instruction (07)mmu table walk data (08)l2 tlb miss instruction (0a)l2 tlb miss data (0b)18191e1f3f4c4d51schedule uop (52)schedule int uop (53)dispatch int uop (56)int uops in schedulers (59)60696a6d6emap stall dispatch (70)flags prf full (73)map rewind (75)map stall (76)dispatch uop (78)map int uop (7c)map int uop inputs (7f)8283flush restart other nonspec (84)85inst all (8c)inst branch (8d)inst branch taken (90)inst branch cond (94)inst int alu (97)9fl1d tlb miss (a1)ld unit uop (a6)l1d cache writeback (a8)a9acc2cdcfd0d5map dispatch bubble (d6)d9daddfetch restart (de)e0? int output thing (e9)? int retires (ef)f5f6f7f8fd
80024534024000000000061800004794625160010160010800103438130049503005338053380432902707343352801838002016002053380781180021109108001010000000050200132400141453359160000105338153381533815338153381
80024533804000000000061800004794625160010160010800103438130149503005338053380432902707343352800108002016002053380781180021109108001010000000050200102400161453359160000105338153381533815338153381
80024533804000000000061800004794625160010160010800103438130149503005338053380432902707343352800108021616002053380781180021109108001010000000050200152400121653359160000105338153381533815338153381
80024533804000000000061800004794625160010160010800103438130149503005338053380432902562343352800108002016002053380781180021109108001010000000050200132400131553359160000105338153381533815338153381
80024533804000000000061800004593125160010160010800103438130149503005338053380432902562343352800108002016002053380781180021109108001010000000050200122400161253359160000105338153381533815338153381
80024533804000000000061800004794625160010160010800103438130149503005338053380432902707343352800108002016002053380781180021109108001010000000050200142400131053359160106105338153381533815338153381
80024533804000000000061800004794625160010160010800103438130149503005338053380432902562343352800108002016002053380781180021109108001010000000050200152400151553359160000105338153381533815338153381
80024533804000000000061800004794625160010160010800103438130149503005338053380432902707343352800108002016002053380781180021109108001010000030050200152400121253359160000105338153381533815338153381
800245338039900000000726800004794625160010160010800103438130149503005338053380432902707343352800108002016002053380781180021109108001010000000050200142400141653359160000105338153381533815338153381
80024533804000000000061800004794625160010160010800103438130149503005338053380432902562343352800108002016002053380781180021109108001010000000050200142400121253359160000105338153381533815338153381