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 (sxtw, 64-bit)

Test 1: uops

Code:

  cmn x0, w1, sxtw
  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)accfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)f5f6f7f8fd
10047095061100030425200020001000408771709709498213561100010002000709781110011000073122116842000710710710710710
10047095061100030425200020001000408771709709498213561100010002000709781110011000073122116842000710710710710710
10047095061100030425200020001000408771709709498253561100010002000709781110011000373122116842000710710710710710
10047095061100030425200020001000408771709709498253561100010002000709781110011000073122116842000710710710710710
10047095061100030425200020001000408771709709498213561100010002000709781110011000073122116842000710710710710710
10047095061100030425200020001000408771709709498213561100010002000709781110011000073122116842000710710710710710
10047095061100030425200020001000408771709709498253561100010002000709781110011000073122116842000710710710710710
10047095061100030425200020001000408771709709498213561100010002000709781110011000073122116842000710710710710710
10047095061100030425200020001000408771709709498213561100010002000709781110011000073122116842000710710710710710
10047096061100030425200020001000408771709709498253561100010002000709781110011000073122116842000710710710710710

Test 2: Latency 3->1

Chain cycles: 1

Code:

  cmn x0, w1, sxtw
  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 instruction (07)l2 tlb miss instruction (0a)18191e3a3f4c4d51schedule 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)9fld unit uop (a6)l1d cache writeback (a8)acbranch cond mispred nonspec (c5)branch mispred nonspec (cb)cdcfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? int retires (ef)f5f6f7f8fd
20204300352241100926810000298992530100301002010719562401492695503003530035273916274872010720316304973003514511202011009910020100101000001111322716252998130000101003003630036300363003630036
20204300352251100026810000298992530100301002010719562401492695503003530035273916274872010720224302363003514511202011009910020100101000001111322716462998130000101003003630036300363003630036
20204300352251100026810000298932530100301002010019561981492695503003530035273693274782010020200302003003514511202011009910020100101000000001314431542995430000101003003630036300363003630036
20204300352251100026810000298932530100301002010019561981492695503003530035273693274782010020200302003003514511202011009910020100101000000001314831892995430000101003003630036300363003630036
20204300352251100026810000298932530100301002010019561981492695503003530035273693274782010020200302003003514511202011009910020100101000000001314831882995430000101003003630036300363003630036
20204300352251110926810000298932530100301002010019561981492695503003530035273693274782010020200302003003514511202011009910020100101000000001314631782995430000101003003630036300363003630036
20204300352251100026810000298932530100301002010019561981492695503003530035273693274782010020200302003003514511202011009910020100101000000001314531892995430000101003003630036300363003630036
20204300352251100026810000298932530100301002010019561981492695503003530035273693274782010020200302003003514511202011009910020100101000000001314831582995430000101003003630036300363003630036
20204300352251100026810000298932530100301002010019561981492695503003530035273693274782010020200302003003514511202011009910020100101000000001314831562995430000101003003630036300363003630036
20204300352251100026810000298932530100301002010019561981492695503003530035273693274782010020200302003003514511202011009910020100101000000001314931782995430000101003003630036300363003630036

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)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)branch cond mispred nonspec (c5)branch mispred nonspec (cb)cdcfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? int retires (ef)f5f6f7f8fd
2002430035225061100002989125300103001020010195628914926955030035300352739132749820010200203002030035145112002110910200101001000001270433132995830000100103003630036300363003630036
2002430035225061100002989125300103001020010195628914926955030035300352739132749820010200203002030035145112002110910200101001000001270433322995830000100103003630036300363003630036
200243003522515455100002989125300103001020010195628904926955030035300352739132749820010200203002030035145112002110910200101001000001270133112995830000100103003630036300363003630036
2002430035225061100002989125300103001020010195628904926955030035300352739132749820010200203002030035145112002110910200101001000001270233212995830000100103003630036300363003630036
2002430035225061100002989125300103001020010195628904926955030035300352739132749820010200203002030035145112002110910200101001000011270133112995830000100103003630036300363003630036
2002430035225061100002989125300103001020010195628904926955030035300352739132749820010200203002030035145112002110910200101001000101270233112995830000100103003630036300363003630036
2002430035225061100002989125300103001020010195628904926955030035300352739132749820010200203002030035145112002110910200101001000001270233232995830000100103003630036300363003630036
2002430035225061100002989125300103001020010195628904926955030035300352739132749820010200203002030035145112002110910200101001000001270133112995830000100103003630036300363003630036
2002430035225061100002989125300103001020010195628904926955030035300352739132749820010200203002030035145112002110910200101001010001270133212995830000100103003630036300363003630036
2002430035225061100002989125300103001020010195628904926955030035300352739132749820010200203002030035145112002110910200101001000001270233112995830000100103003630036300363003630036

Test 3: Latency 3->2

Chain cycles: 1

Code:

  cmn x0, w1, sxtw
  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)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)accfd0d5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? int retires (ef)f5f6f7f8fd
20204300352250611000029893253010030100201001956198049269553003530035273693274782010020200302003003514511202011009910020100101000013101331332995430000101003003630036300363003630036
202043003522512611000029893253010030100201001956198049269553003530035273693274782010020200302003003514511202011009910020100101000013101331322995430000101003003630036300363003630036
202043003522533611000029893253010030100201001956198049269553003530035273693274782010020200302003003514511202011009910020100101000013101331332995430000101003003630036300363003630036
20204300352250611000029893253010030100201001956198149269553003530035273693274782010020200302003003514511202011009910020100101000013101331332995430000101003003630036300363003630036
20204300352250611000029893253010030100201001956198049269553003530035273693274782010020200302003003514511202011009910020100101000013101331332995430000101003003630036300363003630036
20204300352250611000029893253010030100201001956198149269553003530035273693274782010020200302003003514511202011009910020100101000013101331322995430000101003003630036300363003630036
20204300352250611000029893253010030100201001956198149269553003530035273697274782010020200302003003514511202011009910020100101000013101231232995430000101003003630036300363003630036
20204300352250611000029893253010030100201001956198149269553003530035273693274782010020200302003003514511202011009910020100101000013101231222995430000101003003630036300363003630036
20204300352250611000029893253010030100201001956198149269553003530035273693274782010020200302003003514511202011009910020100101000013101331332995430000101003003630036300363003630036
20204300352250611000029893253010030100201001956198049269553003530035273693274782010020200302003003514511202011009910020100101000013101331322995430000101003003630036300363003630036

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)9fl1d cache writeback (a8)accfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? int retires (ef)f5f6f7f8fd
200243003522433726100002989125300103001020010195628904926955300353003527391327498200102002030020300351451120021109102001010010001270233112995830000100103003630036300363003630036
2002430035225061100002989125300103001020010195628914926955300353003527391327498200102002030020300351451120021109102001010010001270233212995830000100103003630036300363003630036
2002430035225061100002989125300103001020010195628904926955300353003527391327498200102002030020300351451120021109102001010010001270133122995830000100103003630036300363003630036
2002430035224061100002989125300103001020010195628904926955300353003527391327498200102002030020300351451120021109102001010010001270233212995830000100103003630036300363003630036
20024300352251861100002989125300103001020010195628914926955300353003527391327498200102002030020300351451120021109102001010010001270133212995830000100103003630036300363003630036
2002430035224061100002989125300103001020010195628904926955300353003527391327498200102002030020300352911120021109102001010010001270133122995830000100103003630036300363003630036
2002430035225961100002989125300103001020010195628904926955300353003527391327498200102002030020300351451120021109102001010010001270233112995830000100103003630036300363003630036
2002430035225061100002989125300103001020010195628904926955300353003527391327498200102002030020300351451120021109102001010010001270133122995830000100103003630036300363003630036
2002430035225061100002989125300103001020010195628904926955300353003527391327498200102002030020300351451120021109102001010010001270133112995830000100103003630036300363003630036
20024300352251861100002989125300103001020010195628914926955300353003527391327498200102002030020300351451120021109102001010010001270233322995830000100103003630036300363003630036

Test 4: throughput

Count: 8

Code:

  cmn x0, w1, sxtw
  cmn x0, w1, sxtw
  cmn x0, w1, sxtw
  cmn x0, w1, sxtw
  cmn x0, w1, sxtw
  cmn x0, w1, sxtw
  cmn x0, w1, sxtw
  cmn x0, w1, sxtw
  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)1e3f4c4d51schedule uop (52)schedule int uop (53)dispatch int uop (56)int uops in schedulers (59)60696a6b6d6emap 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)acbranch mispred nonspec (cb)cfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? int retires (ef)f5f6f7f8fd
8020453433400006180000487412516010016010080100344000514950330053410534104329820633433608010080200160200534107811802011009910080100100000511032422533921600001005341153411534115341153411
8020453410400006180000487412516010016010080100344000504950330053410534104329820503433608010080200160200534107811802011009910080100100000511022422533921600001005341153411534115341153411
80204534104000636180000487412516019116019180100344000514950330053410534104329820633433608010080200160200534107811802011009910080100100000511022422533921600001005345353411534115341153411
8020453410400006180000487412516010016010080100344000514950330053410534104329820503433608010080200160200534107811802011009910080100100000511022422533921600001005341153411534115341153411
80204534104000081480000487412516010016010080100344000504950330053410534104329820633433608010080200160200534107811802011009910080100100000511022422533921600001005341153411534115341153411
8020453410400006180000487412516010016010080100344000504950330053410534104329820603433608010080200160200534107811802011009910080100100000511022422533921600001005341153411534115341153411
8020453410400006180000487412516010016010080100344000504950330053410534104329820633433608010080200160200534107811802011009910080100100000511022422533921600001005341153411534115341153411
8020453410400106180000487412516010016010080100344000504950330053410534104329820603433608010080200160200534107811802011009910080100100000511022422533921600001005341153411534115341153411
8020453410399006180000487412516010016010080100344000504950330053410534104329820633433608010080200160200534107811802011009910080100100000511022422533921600001005341153411534115341153411
802045341040000618000048741251601001601008010034400050495033005341053410432982060343360801008020016020053410781180201100991008010010002310511022422533921600001005341153411534115341153411

1000 unrolls and 10 iterations

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

retire uop (01)cycle (02)03mmu table walk data (08)1e3a3f4c4d51schedule uop (52)schedule int uop (53)dispatch int uop (56)int uops in schedulers (59)6061696a6d6emap 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)acbranch cond mispred nonspec (c5)cfd0d2d5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? int retires (ef)f5f6f7f8fd
800245340140000272780000479462516001016001080010343813010495030053380533804329027073433528001080020160020533807811800211091080010100005024002524222253359160000105338153381533815338153381
800245338040001226280000479462516001016001080010343813010495030053380533804329027073433528001080020160020533807811800211091080010100005024001724221853359160000105338153381533815338153381
800245338040000240680000479462516001016001080010343813010495030053380533804329027073433528001080020160020533807811800211091080010100005024002224202253359160000105338153381533815338153381
80024533804000026280000479462516001016001080010343813010495030053380533804329025623433528001080020160020533807811800211091080010100005024002124222253359160000105342153381533815338153381
80024533804000026280000479462516001016001080010343813010495030053380533804329025623433528001080020160020533807811800211091080010100005024002024242053359160000105338153381533815338153381
80024533804000026280000479462516001016001080010343813010495030053380533804329025623433528001080020160020533807811800211091080010100005024002424242453359160000105338153381533815338153381
80024533804000026280000479462516001016001080010343813010495030053380533804329025623433528001080020160020533807811800211091080010100005024002024222253359160000105338153381533815338153381
80024533803990026280000479462516001016001080010343813010495030053380533804329027073433528001080215160020533807811800211091080010100005024002024241953359160000105338153381533815338153381
80024533804000026280000479462516001016001080010343813000495030053380533804329027073433528001080020160020533807811800211091080010100005024001824222353359160000105338153381533815338153381
80024533804000026280000479462516001016001080010343813010495030053380533804329025623433528001080020160426533807811800211091080010100005024002224182453359160000105338153381533815338153431