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, 32-bit)

Test 1: uops

Code:

  cmn w0, 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)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
100470962461100030425200020001000408771709709498213561100010002000709781110011000073122116842000710710710710710
10047096061100030425200020001000408771709709498253561100010002000709781110011000073122116842000710710710710710
10047095061100030425200020001000408771709709498213561100010002000709781110011000073122116842000710710710710710
10047095061100030425200020001000408770709709498253561100010002000709781110011000073122116842000710710710710710
1004709551103100030425200020001000408770709709498253561100010002000709781110011000073122116842000710710710710710
10047095061100030425200020001000408770709709498253561100010002000709781110011000073122116842000710710710710710
10047096061100030425200020001000408771709709498253561100010002000709781110011000073122116842000710710710710710
10047095061100030425200020001000408771709709498253561100010002000709781110011000073122116842000710710710710710
10047095061100030425200020001000408771709709498253561100010002000709781110011000073122116842000710710710710710
10047095061100030425200020001000408771709709498213561100010002000709781110011000073122116842000710710710710710

Test 2: Latency 3->1

Chain cycles: 1

Code:

  cmn w0, 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)0318191e3f4c4d51schedule 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)accfd0d5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? int retires (ef)f5f6f7f8fd
20204300352250006110007298932530100301002010019561981492695530035300352736932747820100202003020030035145112020110099100201001010000013101231222995430000101003003630036300363003630036
20204300352240006110000298932530100301002010019561981492695530035300352736932747820100202003020030035145112020110099100201001010000013101231222995430000101003003630036300363003630036
20204300352250006110000298932530100301002010019561981492695530035300352736932747820100202003020030035145112020110099100201001010000013101231222995430000101003003630036300363003630036
20204300352240006110000298932530100301002010019561981492695530035300352736932747820100202003020030035145112020110099100201001010000013101231222995430000101003003630036300363003630036
20204300352240008410000298932530100301002010019561981492695530035300352736932747820100202003020030035145112020110099100201001010000013101231222995430000101003003630036300363003630036
20204300352250006110000298932530100301002010019561981492695530035300352736932747820100202003020030035145112020110099100201001010000013101231222995430000101003003630036300363003630036
20204300352250006110000298932530100301002010019561981492695530035300352736932747820100202003020030035145112020110099100201001010000013101231222995430000101003006730036300363003630036
20204300352250006110000298932530100301002010019561981492695530035300352736932747820100202003020030035145112020110099100201001010000013101231222995430000101003003630036300363003630036
20204300352250006110000298932530100301002010019561981492695530035300352736932747820100202003020030035145112020110099100201001010000013101231222995430000101003003630036300363003630036
20204300352250006110000298932530100301002010019561981492695530035300352736932747820100202003020030035145112020110099100201001010000013101231322995430000101003003630036300363003630036

1000 unrolls and 10 iterations

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

retire uop (01)cycle (02)033f4c4d51schedule 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)accdcfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? int retires (ef)f5f6f7f8fd
200243003522519510000298912530010300252001019562891492695530035300352739103274982001020020300203003514511200211091020010100100001270417552995830000100103003630036300363003630036
20024300352256110000298912530010300102001019562891492695530035300352739103274982001020020300203003514511200211091020010100100001270533332995830000100103003630036300363003630036
20024300352256110000298912530010300102001019562891492695530035300352739133274982001020020300203003514511200211091020010100100001270533342995830000100103003630036300363003630036
20024300352256110000298912530010300102001019562891492695530035300352739103274982001020020300203003514511200211091020010100100001270633452995830000100103003630036300363003630036
200243003522561100002989125300103001020010195628914926955300353003527391032749820010200203002030035145112002110910200101001003901270433342995830000100103003630036300363003630036
20024300352256110000298912530010300102001019562891492695530035300352739103274982001020020300203003514511200211091020010100100001270433552995830000100103003630036300363003630036
20024300352256110000298912530010300102001019562891492695530035300352739103274982001020020300203003514511200211091020010100100001270517432995830000100103003630036300363003630036
20024300352256110000298912530010300102001019562891492695530035300352739103274982001020020300203003514511200211091020010100100001270533452995830000100103003630036300363003630036
20024300352256110000298912530010300102001019562891492695530035300352739103274982001020020300203003514511200211091020010100100001270533442995830000100103003630036300363003630036
20024300352256110000298912530010300102001019562891492695530035300352739103274982001020020300203003514511200211091020010100100001270533342995830000100103003630036300363003630036

Test 3: Latency 3->2

Chain cycles: 1

Code:

  cmn w0, 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)033f4c4d51schedule 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 miss (a1)l1d cache writeback (a8)acbranch mispred nonspec (cb)cfd0d5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? int retires (ef)f5f6f7f8fd
202043003522561100002989325301003010020100195619804926955300353003527369327478201002020030200300351451120201100991002010010100000013101231222998930032101003003630036300363003630036
202043003522561100072986525301003010020100195619804926955300353003527369327478201002020030200300351451120201100991002010010100000013101231222995430000101003003630036300363003630036
202043003522561100002989325301003010020100195619804926955300353003527369327478201002020030200300351451120201100991002010010100000013101231222995430000101003003630036300363003630036
202043003522561100002989325301003010020100195619804926955300353003527369327478201002020030200300351451120201100991002010010100000013101231222995430000101003003630036300363003630036
202043003522561100002989325301003010020100195619814926955300353003527369327478201002020030200300351451120201100991002010010100000013101231222995430000101003003630036300363003630036
202043003522561100002989325301003010020100195619804926955300353003527369327478201002020030200300351451120201100991002010010100000013101331222995430000101003003630036300363003630036
202043003522561100002989325301003010020100195619804926955300353003527369327478201002020030200300351451120201100991002010010100000013101231222995430000101003003630036300363003630036
202043003522561100002989325301003010020100195619804926955300353003527369327478201002020030200300351451120201100991002010010100000013101231222995430000101003003630067300363003630036
20204300352251258100002989325301003010020100195619804926955300353003527369327478201002020030200300351451120201100991002010010100000013101231222995430000101003003630036300363003630036
202043003522561100002989325301003010020100195619804926955300353003527369327478201002020030200300351451120201100991002010010100000013101231222995430000101003003630036300363003630036

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)696a6d6emap 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)acbranch cond mispred nonspec (c5)cfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? int retires (ef)f5f6f7f8fd
20024300352240126100002989125300103001020010195628949269553003530035273913274982001020020300203003514511200211091020010100100001270133112995830000100103003630036300363003630036
2002430035225061100002989125300103001020010195628949269553003530035273913274982001020020300203003514511200211091020010100100001270133112995830000100103003630036300363003630036
2002430035225089100002989125300103001020010195628949269553003530035273913274982001020020300203003514511200211091020010100100301270133112995830000100103003630036300363003630036
2002430035225061100002989125300103001020010195628949269553003530035273913274982001020020300203003514511200211091020010100100001270133112995830000100103003630036300363003630036
2002430035225061100002989125300103001020010195628949269553003530035273913274982001020020300203003514511200211091020010100100001270233112995830000100103003630067300363003630036
20024300352257261100002989125300103001020010195628949269553003530035273913274982001020020300203003514511200211091020010100100001270133112995830000100103003630036300363003630036
2002430035225061100002989125300103001020010195628949269553003530035273913274982001020020300203003514511200211091020010100100001270133112995830000100103003630036300363003630036
2002430035225061100002989125300103001020010195628949269553003530035273913274982001020020300203003514511200211091020010100100001270133122995830000100103003630036300363003630036
2002430035225061100072989125300103001020010195628949269553003530035273913274982001020020300203003514511200211091020010100100001270133112995830000100103003630036300363003630036
2002430035225061100002989125300103001020010195628949269553003530035273913274982001020020300203003514511200211091020010100100001270133112995830000100103003630036300363003630036

Test 4: throughput

Count: 8

Code:

  cmn w0, w1, uxtb
  cmn w0, w1, uxtb
  cmn w0, w1, uxtb
  cmn w0, w1, uxtb
  cmn w0, w1, uxtb
  cmn w0, w1, uxtb
  cmn w0, w1, uxtb
  cmn w0, 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)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)696a6d6emap 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 access (a0)l1d tlb miss (a1)ld unit uop (a6)l1d cache writeback (a8)accdcfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? int retires (ef)f5f6f7f8fd
802045345740000001020061800004874125160100160100801003440005495033053410534104329820603433608010080200160200534107811802011009910080100100000000511022411533921600001005341153411534115345953411
802045341040000000006180000487412516010016010080100344000549503305341053410433642060343360801008020016020053410781180201100991008010010000008310511012411533921600001005341153411534115341153411
8020453410400000000061800004874125160100160100801003440005495033053410534104329820633433608010080200160200534107811802011009910080100100000000511012411533921600001005341153411534115341153411
8020453410400000000061800004874125160100160100801003440005495033053410534104329820503433608010080200160200534107811802011009910080100100000000511012411533921600001005341153411534115341153411
80204534104000000270061800004874125160100160100801003440005495033053410534104329820633433608010080200160200534107811802011009910080100100000000511012411533921600001005341153411534115341153452
8020453410400000030061800004874125160100160100801003440005495033053410534104329820503433608010080200160200534107811802011009910080100100000000511012411533921600001005341153411534115341153411
8020453410400000060061800004874125160100160100801003440005495033053410534104331520633433608010080200160200534107811802011009910080100100000000511012411533921600001005341153411534115341153411
8020453410400000000061800004874125160223160100801003440005495033053410534104329820633433608010080200160200534107811802011009910080100100000000513911711533921600001005341153411534115341153411
80204534104000000450061800004874125160100160100801003440005495033053410534104329820633433608010080200160200534107811802011009910080100100000000511012411533921600001005341153411534115341153411
8020453410400000000061800004874125160100160100801003440005495033053410534104329820503433608010080200160200534107811802011009910080100100000000511012411533921600001005341153411534115341153411

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)acbranch cond mispred nonspec (c5)cdcfd2d5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? int retires (ef)f5f6f7f8fd
80024534014000618000047946251600101600108001034381300495030053380533804329027073433528001080020160020533807811800211091080010103000502007243253359160000105338153381533815338153381
80024533803990618000047946251600101600108001034381300495030053380533804329027078433858001080020160020533807811800211091080010100000502006243253359160000105338153381533815338153381
80024533804000618000047946251600101600108001034381300495030053380533804329027073433528001080020160020533807811800211091080010100000502003243253359160000105338153381533815338153381
80024533803990618000047946251600101600108001034381300495030053380533804329025623433528001080020160020533807811800211091080010100000502004242353359160000105338153381533815338153381
80024533804000618000047946251600101600108001034381300495030053380533804329025623433528001080020160020533807811800211091080010100000502003243253359160000105338153381533815338153381
80024533804000618000047946251600101600108001034381300495030053380533804329027073433528001080020160020533807811800211091080010100000502004242353359160000105338153381533815338153381
80024533804000618000047946251600101600108001034381300495030053380533804329027073433528001080020160020533807811800211091080010100000502004243353359160000105338153381533815338153381
80024533804000618000047946251600101600108001034381300495030053380533804329027073433528001080020160020533807811800211091080010100000502004243353359160000105338153381533815338153381
80024533803990618000047946251600101600108001034381300495030053380533804329025623433528001080020160020533807811800211091080010100000502004243253359160000105338153381533815338153381
80024533804000618000047946251600101600108001034381300495030053380533804329027073433528001080020160020533807811800211091080010100000502004243353359160000105338153381533815338153381