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, asr, 64-bit)

Test 1: uops

Code:

  cmp x0, x1, asr #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)6d6emap 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
10047096061100030425200020001000408777097094982135611000100020007097811100110000073222226842000710710710710710
10047096061100030425200020001000408777097094982535611000100020007097811100110000073222226842000710710710710710
10047095061100030425200020001000408777097094982535611000100020007097811100110000073222236842000710710710710710
10047096661100030425200020001000408777097094982135611000100020007097811100110000073222226842000710710710710710
10047095061100030425200020001000408777097094982135611000100020007097811100110000073222226842000710710710710710
10047096061100030425200020001000408777097094982135611000100020007097811100110000073222226842000710710710710710
10047095061100030425200020001000408777097094982135611000100020007097811100110000073222226842000710710710710710
10047095061100030425200020001000408777097094982535611000100020007097811100110000073222226842000710710710710710
10047096061100030425200020001000408777097094982135611000100020007097811100110000073222226842000710710710710710
10047095061100030425200020001000408777097094982135611000100020007097811100110000073222226842000710710710710710

Test 2: Latency 3->1

Chain cycles: 1

Code:

  cmp x0, x1, asr #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 instruction (07)mmu table walk data (08)191e3f4c4d51schedule 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)accdcfd0d5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? int retires (ef)f5f6f7f8fd
2020430035225100061100002990825301003014320100195619814926955300353008027382327478201002020030200300351451120201100991002010010100000013271231322995430000101003003630036300363003630036
2020430035224000082100002989325301003010020100195619814926955300353003527369327478201002020030200300351451120201100991002010010100000013101231222995430000101003003630036300363003630036
2020430035224000061100002989325301003010020100195619814926955300353003527369327478201002020030200300351451120201100991002010010100000013101231222995430000101003003630036300363003630036
2020430035225000061100002989325301003010020100195619814926955300353003527369327478201002020030200300351451120201100991002010010100000013101231222995430000101003003630036300363003630036
2020430035225000061100002989325301003010020100195619814926955300353003527369327478201002020030200300351451120201100991002010010100000013101231222995430000101003003630036300363003630036
2020430035225000061100062989325301003010020100195619814926955300353003527369327478201002020030200300351451120201100991002010010100000113101231222995430000101003003630036300363003630036
2020430035225000061100002989325301003010020100195619814926955300353003527369327478201002020030200300351451120201100991002010010100000013101231222995430000101003003630036300363003630036
2020430035225000061100002989325301003010020100195619814926955300353003527369327478201002020030200300351451120201100991002010010100000013101231222995430000101003003630036300363003630036
2020430035224000061100002989325301003010020100195619814926955300353003527369327478201002020030200300351451120201100991002010010100000013101231222995430000101003003630036300363003630036
2020430035225000061100002989325301003010020100195619814926955300353003527369327478201002020030200300351451120201100991002010010100000013101231222995430000101003003630036300363003630036

1000 unrolls and 10 iterations

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

retire uop (01)cycle (02)030918191e1f3f4c4d51schedule 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 cache writeback (a8)a9accfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? int retires (ef)f5f6f7f8fd
2002430035225000006110000298912530010300102001019562891492695530035300352739132749820010200203002030035145112002110910200101001000001270233112995830000100103003630036300363003630036
2002430035225000006110000298912530010300102001019562891492695530035300352739132749820010200203002030035145112002110910200101001001001270133112995830000100103003630036300363003630036
2002430035224000006110000298912530010300102001019562891492695530035300352739132749820010200203002030035145112002110910200101001000001270133112995830000100103003630036300363003630036
2002430035225000006110000298912530010300102001019562891492695530035300352739132749820010200203002030035145112002110910200101001000001270133112995830000100103003630036300363003630036
20024300352250000054710000298912530010300102001019562891492695530035300352739132749820010200203002030035145112002110910200101001000001270133112995830000100103003630036300363003630036
20024300352250000023110000298912530010300102001019562891492695530035300352739132749820010200203002030035145112002110910200101001000001270133112995830000100103003630036300363003630036
200243003522500000142910000298912530010300102001019562891492695530035300352739132749820010200203042230035145112002110910200101001000001270133112995830000100103003630036300363003630036
2002430035225011006110000298912530010300992001019562891492695530035300352739132749820010200203002030035145112002110910200101001000001270133112995830000100103003630036300363003630036
2002430035226000006110000298912530010300102001019562891492695530035300352739132749820010200203002030035145112002110910200101001000001270233112995830000100103003630036300363003630036
20024300352250000023110000298912530010300102001019562891492704730035300352739132749820010200203002030035145112002110910200101001000001270133112995830000100103003630036300363003630036

Test 3: Latency 3->2

Chain cycles: 1

Code:

  cmp x0, x1, asr #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)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)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
202043003522506110000298992530100301002010719562401492695530035300352739162748720107202243023630035145112020110099100201001010000011113180116112998130000101003003630036300363003630036
202043003522406110000298992530100301002010719562400492695530035300352739162748720107202243023630035145112020110099100201001010000011113180116112998130000101003003630036300363003630036
202043003522506110000298932530100301002010019561980492695530035300352736932747820100202003020030035145112020110099100201001010000000013101231222995430000101003003630036300363003630036
202043003522506110000298932530100301002010019561980492695530035300352736932747820100202003020030035145112020110099100201001010000000013101231222995430000101003003630036300363003630036
202043003522506110000298932530100301002010019561980492695530035300352736932747820100202003020030035145112020110099100201001010000000013101231222995430000101003003630036300363003630036
202043003522506110000298932530100301002021019561981492695530035300352736932747820100202003020030035145112020110099100201001010000000013101231222995430000101003003630036300363003630036
202043003522506110000298932530100301002010019561980492695530035300352736932747820100202003020030035145112020110099100201001010000000013101231222995430000101003003630036300363003630036
202043003522506110000298932530100301002010019561980492695530035300352736932747820100202003020030035145112020110099100201001010000000013101231222995430000101003003630036300363003630036
202043003522506110000298932530100301002010019561980492695530035300352736932747820100202003020030035145112020110099100201001010000000013101231222995430000101003003630036300363003630036
202043003522506110000298932530100301002010019561980492695530035300352736932747820100202003020030035145112020110099100201001010000000013101231222995430000101003003630036300363003630036

1000 unrolls and 10 iterations

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

retire uop (01)cycle (02)03l2 tlb miss instruction (0a)18191e1f3f4c4d51schedule 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)accfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? int retires (ef)f5f6f7f8fd
200243003522500000611000029891253001030010200101956289049269550300353003527391327498200102002030020300351451120021109102001010010001270133112995830000100103003630036300363003630036
200243003522510000611000029891253001030010200101956289149269550300353003527391327498200102002030020300351451120021109102001010010601270133112995830000100103003630036300363003630036
200243003522500000611000029891253001030010200101956289049269550300353003527391327498200102002030020300351451120021109102001010010001270133112999130000100103003630036300363003630036
200243003522500000611000029891253001030010200101956289049269550300353003527391327498200102002030020300351451120021109102001010010001270133112995830000100103003630036300363003630036
200243003523200000611000029891253001030010200101956289049269550300353003527391327498200102002030020300351451120021109102001010010001270133122995830000100103003630036300363003630036
200243003522500000611000029891253001030010200101956289049269550300353003527391327498200102002030020300351451120021109102001010010001270133112995830000100103003630036300363003630036
200243003522500000611000029891253001030010200101956289049269550300353003527391327498200102002030020300351451120021109102001010010101270133112995830000100103003630036300363003630036
200243003522500000611000029891253001030010200101956289049269550300353003527391327498200102002030020300351451120021109102001010010001270133112995830000100103003630036300363003630036
200243003522400000611000029891253001030010200101956289049269550300353003527391327498200102002030020300351451120021109102001010010001270133112995830000100103003630036300363003630036
200243003522400000611000029891253001030010200101956289049269550300353003527391327498200102002030020300351451120021109102001010010001270133112995830000100103003630036300823012630036

Test 4: throughput

Count: 8

Code:

  cmp x0, x1, asr #17
  cmp x0, x1, asr #17
  cmp x0, x1, asr #17
  cmp x0, x1, asr #17
  cmp x0, x1, asr #17
  cmp x0, x1, asr #17
  cmp x0, x1, asr #17
  cmp x0, x1, asr #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)031e3f4c4d51schedule 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 cache writeback (a8)acbranch cond mispred nonspec (c5)cdcfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? int retires (ef)f5f6f7f8fd
80204534124000618000048741251601001601008010034400054950330534105341043366205034336080100802001602005341078118020110099100801001000000511032422533921600001005341153411534115341153411
802045341040002338000048741251601001601008010034400054950330534105341043298205034336080100802001602005341078118020110099100801001000000511022422533921600001005341153411534115341153411
8020453410400017038000048741251601001601008010034400054950330534105341043298206334336080100802001604125341078118020110099100801001000000511022422533921600001005341153411534115341153411
80204534104000233800004874125160100160100801003440005495033053410534104329820603433608010080200160200534107811802011009910080100100024900511022422533921600001005341153411534115341153411
80204534104005498568000048741251601001601008010034400054950330534105341043298206334336080100802001602005341078118020110099100801001000000511022422533921600001005341153411534115341153411
802045341040001918000048741251601001601008010034400054950330534105341043298206334336080100802001602005341078118020110099100801001000000511022422533921600001005341153411534115341153411
802045341040003648000048741251601001601008010034400054950330534105341043298205034336080100802001602005341078118020110099100801001000000511022422533921600001005341153411534115341153411
802045341040001038000048741251601001601008010034400054950330534105341043298206334336080100803061602005341078118020110099100801001000000511022422533921600001005341153411534115341153411
802045341040001498000048741251601001601008010034400054950330534105341043298206334336080100802001602005341078118020110099100801001000000511022422533921600001005341153411534115341153411
802045341040001918000048741251601001601008010034400054950330534105341043298205034336080100802001602005341078118020110099100801001000000511022422533921600001005341153411534115345553411

1000 unrolls and 10 iterations

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

retire uop (01)cycle (02)03l2 tlb miss data (0b)1e3f4c4d51schedule uop (52)schedule int uop (53)dispatch int uop (56)int uops in schedulers (59)5f60696a6d6emap 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)accfd0l1i cache miss demand (d3)d5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? int retires (ef)f5f6f7f8fd
8002453383400021618000047946251600101600108001034381300049503005338053380432902562343352800108002016002053380781180021109108001010005020004244253359160000105338153423533815338153381
800245338040000618000047946251600101600108001034381300049503005338053380432902562343352800108002016002053380781180021109108001010005020004244253359160000105338153381533815338153381
800245338040000618000047946251600101600108001034381300049503005338053380432902707343352800108002016002053380781180021109108001010005020012245453359160000105338153381533815338153381
800245338039900618000047946251600101600108001034381300049503005338053380432902562343352800108002016002053380781180021109108001010005020004242453359160000105338153381533815338153381
800245338040000618000047946251600101601168001034381300049503005338053380432902707343352800108002016002053380781180021109108001010005020002242453359160000105338153381533815338153381
800245338039900618000047946251600101600108001034381300049503005338053380432902707343352800108002016002053380781180021109108001010005020002242453359160000105338153381533815338153381
800245338040000618000047946251600101600108001034381300049503005338053380432902562343352800108002016002053380781180021109108001010005020002244253359160000105338153381533815338153381
800245338039900618000047946251600101600108001034381300049503005338053380432902707343352800108002016002053380781180021109108001010005020002242453359160000105338153381533815338153381
800245338040000618000047946251600101600108001034381300049503005338053380432902562343352800108002016002053380781180021109108001010005020004242453359160000105338153381533815338153381
800245338040000618000047946251600101600108001034381300049503005338053380432902707343352800108002016002053380781180021109108001010005020004246353359160000105338153381533815338153381