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

CMN (uxtb, 64-bit)

Test 1: uops

Code:

  cmn x0, w1, uxtb
  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)03181e3f4c4d51schedule 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
1004709500611000304252000200010004087717097094982135611000100020007097811100110000073222116842000710710710710710
1004709500611000304252000200010004087717097094982135611000100020007097811100110000073122116842000710710710710710
1004709500611000304252000200010004087717097094982135611000100020007097811100110000073122116842000710710710710710
10047095015611000304252000200010004087717097094982535611000100020007097811100110000073122116842000710710710710710
10047095001031000304252000200010004087717097094982535611000100020007097811100110000073122116842000710710710710710
1004709500611000304252000200010004087717097094982535611000100020007097811100110000073122116842000710710710710710
1004709600611000304252000200010004087717097094982135611000100020007097811100110000073122116842000710710710710710
1004709500611000304252000200010004087717097094982135611000100020007097811100110000073122116842000710710710710710
1004709500611000304252000200010004087717097094982135611000100020007097811100110001073122116842000710710710710710
1004709500611000304252000200010004087717097094982135611000100020007097811100110000073122116842000710710710710710

Test 2: Latency 3->1

Chain cycles: 1

Code:

  cmn x0, w1, uxtb
  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)031e3f4c4d51schedule 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 tlb access (a0)l1d tlb miss (a1)ld unit uop (a6)l1d cache writeback (a8)a9acc2branch cond mispred nonspec (c5)cfd0d5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? int retires (ef)f5f6f7f8fd
202043003522439611000029893253010030100201001956198149269553003530035273693274782010020200302003003514511202011009910020100101000000000013101231222995430000101003003630036300363003630036
202043003522539611000029893253010030100201001956198149269553003530035273693274782010020200302003003514511202011009910020100101000000000013101231222995430000101003003630036300363003630036
202043003522515611000029893253010030100201001956198149269553003530035273693274782010020200302003003514511202011009910020100101000000000013101231222995430000101003003630036300363003630036
202043003522527611000029893253010030100201001956198149269553003530035273693274782010020200302003003514511202011009910020100101000000000013101231222995430000101003003630036300363003630036
202043003522424611000029893253010030100201001956198049269553003530035273693274782010020200302003003514511202011009910020100101000000000013101231222995430000101003003630036300363003630036
202043003522536611000029893253010030100201001956198049269553003530035273693274782010020200302003003514511202011009910020100101000000000013101231222995430000101003003630036300363003630036
202043003522527611000029893253010030100201001956198049269553003530035273693274782010020200302003003514511202011009910020100101000000000013101231222995430000101003003630036300363003630036
20204300352250611000029893253010030100201001956198049269553003530035273693274782010020200302003003514511202011009910020100101000000000013101231222995430000101003003630036300363003630036
202043003522412611000029893253010030100201001956198149269553003530035273693274782010020200302003003514511202011009910020100101000000000013101231222995430000101003003630036300363003630036
202043003522433611000029893253010030100201001956198149269553003530035273693274782010020200302003003514511202011009910020100101000000000013101331222995430000101003003630036300363003630036

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)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)9fcfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? int retires (ef)f5f6f7f8fd
20024300352250611000029891253001030010200101956289149269553003530035273913274982001020020300203003514511200211091020010100101270133112995830000100103003630036300363003630036
20024300352250611000029891253001030010200101956289049269553003530035273913274982001020020300203003514511200211091020010100101270133112999730000100103003630036300363003630036
20024300352250611000029891253001030010200101956289149269553003530035273913274982001020020300203003514511200211091020010100101270133112995830000100103003630036300363003630036
20024300352250611000029883253001030010200101956289049269553003530035273913274982001020020300203003514511200211091020010100101270133112995830000100103003630036300363003630036
20024300352250611000029891253001030010200101956289149269553003530035273913274982001020020300203003514511200211091020010100101270233122995830000100103003630036300363003630036
20024300352240611000029891253001030033200101956289049269553003530035273913274982001020020300203003514511200211091020010100101270133112995830000100103003630036300363003630036
20024300352250611000029891253001030010200101956289149269553003530035273913274982001020020300203003514511200211091020010100101270133112995830000100103003630036300363003630036
20024300352250611000029891253001030010200101956289149269553003530035273913274982001020020300203003514511200211091020010100101270133112995830000100103003630036300363003630036
20024300352250611000029891253001030010200101956289049269553003530035273913274982001020020300203003514511200211091020010100101270233112995830000100103003630036300363003630036
20024300352250611000029891253001030010200101956289149269553003530035273913274982001020020300203003514511200211091020010100101270133112995830000100103003630036300363003630036

Test 3: Latency 3->2

Chain cycles: 1

Code:

  cmn x0, w1, uxtb
  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)03mmu table walk data (08)l2 tlb miss data (0b)18191e1f3a3f4c4d51schedule 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 tlb access (a0)l1d tlb miss (a1)ld unit uop (a6)st unit uop (a7)l1d cache writeback (a8)acc2cfd0d5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? int retires (ef)f5f6f7f8fd
20204300352250000450161100002989325301003010020100195619814926955300353003527369327478201002020030200300351451120201100991002010010100000000013101231222995430000101003003630036300363003630036
20204300352251000270061100002989325301003010020100195619814926955300353003527369327478201002020030200300351451120201100991002010010100000000213101231222995430000101003003630036300363003630036
2020430035225000024352061100002989325301003010020100195619814926955300353003527369327478201002020030200300351451120201100991002010010100000000013101231222995430000101003003630036300363003630036
20204300352250000270061100002989325301003010020100195619814926955300353003527369327478201002020030200300351451120201100991002010010100000000013101231222995430000101003003630036300363003630036
20204300352250000180061100002989325301003010020100195693314926955300353003527369327478201002020030200300351451120201100991002010010100000000013101231222995430000101003003630036300363003630036
20204300352250000270061100002989325301003010020100195619814926955300353003527369327478201002020030200300351451120201100991002010010100000000013101231222995430000101003003630036300363003630036
20204300352250000270061100002989325301003010020100195619814926955300353003527369327478201002020030200300351451120201100991002010010100000000013101231222995430000101003003630036300363003630036
2020430035225000000061100002989325301003010020100195619814926955300353003527369327478201002020030200300351451120201100991002010010100000000013101231222995430000101003003630036300363003630036
20204300352250000270061100002989325301003010020100195619814926955300353003527369327478201802020030200300351451120201100991002010010100000000013101231222995430000101003003630036300363003630036
20204300352250000270061100002989325301003020720100195619814926955300353003527369327478201002020030200301281451120201100991002010010100000000013101231222995430000101003003630036300363003630036

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)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)cfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? int retires (ef)f5f6f7f8fd
2002430035225082100002989125300103001020010195628914926955300353003527391032749820010200203002030035145112002110910200101001001270533452995830000100103003630036300363003630036
2002430035225061100002989125300103001020010195628904926955300353003527391032749820010200203002030035145112002110910200101001001270433442995830000100103003630036300363003630036
2002430035224061100002989125300103001020010195628914926955300353003527391032749820010200203002030035145112002110910200101001001270433542995830000100103003630036300363003630036
2002430035225061100002989125300103001020010195628919826955300353003527391032749820010200203002030035145112002110910200101001001270433442995830000100103003630036300363003630036
2002430035225061100002989125300103001020010195628914926955300353003527391032749820010200203002030035145112002110910200101001001270333442995830000100103003630036300363003630036
2002430035225061100002989125300103001020010195628914926955300353003527391032749820010200203002030035145112002110910200101001001270633762995830000100103003630036300363003630036
2002430035225061100002989125300103001020010195628914926955300353003527391032749820010200203002030035145112002110910200101001001270433452995830000100103003630036300363003630036
2002430035224061100002989125300103001020010195628914926955300353003527391032749820010200203002030035145112002110910200101001001270533552995830000100103003630036300363003630036
2002430035225061100002989125300103001020010195628914926955300353003527391032749820010200203002030035145112002110910200101001001270433442995830000100103003630067300363003630036
2002430035225061100002989125300103001020010195628914926955300353003527391032749820010200203002030035145112002110910200101001001270533542995830000100103003630036300363003630036

Test 4: throughput

Count: 8

Code:

  cmn x0, w1, uxtb
  cmn x0, w1, uxtb
  cmn x0, w1, uxtb
  cmn x0, w1, uxtb
  cmn x0, w1, uxtb
  cmn x0, w1, uxtb
  cmn x0, w1, uxtb
  cmn x0, w1, uxtb
  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)0309191e1f3f4c4d51schedule 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)acc2cfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? int retires (ef)f5f6f7f8fd
80204534574000000618000048741251601001601008010034400050495033053410534104329820633433608010080200160200534107811802011009910080100100000511032422533921600001005341153411534115341153411
80204534104000000618000048741251601001601008010034400051495033053410534104329820633433608010080200160200534107811802011009910080100100000511022422533921600001005341153411534115341153411
80204534104000000618000048741251601001601008010034400050495033053410534104329820503433608010080200160200534107811802011009910080100100000511022422533921600001005341153411534115341153411
80204534104000000618000048741251601001601008010034400051495033053410534104329820603433608010080200160200534107811802011009910080100100000511022432533921600001005341153411534115341153411
80204534104000000618003948741251601001601008010034400051495033053410534104329820603433608010080200160200534107811802011009910080100100000511022422533921600001005341153411534115341153411
80204534104000000618000048741251601001601008010034400050495033053410534104329820603433608010080200160200534107811802011009910080100100000511022422533921600001005341153411534115341153411
80204534104000030618000048741251601001601008010034400050495033053410534104329820503433608010080200160200534107811802011009910080100100030511022422533921600001005341153411534115341153411
80204534104000000618000048741251601001601008010034400050495033053410534104329820503433608010080200160200534107811802011009910080100100000511022422533921600001005341153411534115341153411
80204534104000000618000048741251601001601008010034400050495033053410534104329820633433608010080200160200534107811802011009910080100100000511022422533921600001005341153411534115341153411
802045341040000688618000048741251601001601008010034400051495033053410534104329820503433608010080200160200534107811802011009910080100100000511022422533921600001005341153411534115341153411

1000 unrolls and 10 iterations

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

retire uop (01)cycle (02)031e3f4c4d51schedule 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)accfd0d5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? int retires (ef)f5f6f7f8fd
8002453383400061800004794625160010160010800103438130149503005338053380432902707343352800108002016002053380781180021109108001010120502001241153359160000105338153381533815338153381
800245338039906180000479462516001016001080010343813004950300533805338043290270734335280010800201600205342378118002110910800101000502001241153359160000105338153381533815338153381
800245338039906180000479462516001016001080010343813004950300533805338043290256234335280010800201600205338078118002110910800101000502001241153359160000105338153381533815338153381
800245338040006180000479462516001016001080010343813004950300533805338043290270734335280010800201600205338078118002110910800101000502001241153359160000105338153381533815338153381
8002453380400025180000479462516001016001080010343813004950300533805338043290270734335280010800201600205338078118002110910800101000502001241153359160000105338153381533815338153381
800245338039906180000479462516001016001080010343813004950300533805338043290256234335280010800201600205338078118002110910800101000502001241153359160000105338153381533815338153381
8002453380400053680000479462516001016001080010343813004950300533805338043290256234335280010800201600205338078118002110910800101000502001241153359160000105338153381533815338153381
800245338039906180000479462516001016001080010343813004950300533805338043290270734335280010800201600205338078118002110910800101000502001241153359160000105338153381533815338153381
800245338039906180000479462516001016001080010343813004950300533805338043290256234335280010800201600205338078118002110910800101000502001241153359160000105338153381533815338153381
800245338040006180000479462516001016001080010343813004950300533805338043290256234335280010800201600205338078118002110910800101000502001241153359160000105338153381533815338153381