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 (sxth, 32-bit)

Test 1: uops

Code:

  cmn w0, w1, sxth
  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)acc3cfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)f5f6f7f8fd
1004709508210003042520002000100040877170970949825356110001000200070978111001100000073222116842000710710710710710
1004709506110003042520002000100040877170970949825356110001000200070978111001100000073122116842000710710710710710
1004709506110003042520002000100040877170970949821356110001000200070978111001100000073122116842000710710710710710
1004709506110003042520002000100040877170970949825356110001000200070978111001100000073122116842000710710710710710
1004709506110003042520002000100040877170970949821356110001000200070978111001100000073122116842000710710710710710
1004709606110003042520002000100040877170970949825356110001000200070978111001100003073122116842000710710710710710
10047096306110003042520002000100040877170970949825356110001000200070978111001100000073122116842000710710710710710
1004709606110003042520002000100040877170970949821356110001000200070978111001100000073122116842000710710710710710
1004709506110003042520002000100040877170970949825356110001000200070978111001100000073122116842000710710710710710
1004709506110003042520002000100040877170970949825356110001000200070978111001100000073122116842000710710710710710

Test 2: Latency 3->1

Chain cycles: 1

Code:

  cmn w0, w1, sxth
  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)181e3f4c4d51schedule 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
202043003522500061100002989325301003010020100195619804926955300353003527369327478201002020030200300351451120201100991002010010100023113101331322995430000101003003630036300363003630036
202043003522500061100002989325301003010020100195619804926955300353003527369327478201002020030200300351451120201100991002010010100023413101231222995430000101003003630036300363003630036
2020430035225000611000029893253010030100201001956198049269553003530035273693274782010020200302003003514511202011009910020100101000013101231222995430000101003003630036300363003630036
2020430035225000611000029893253010030100201001956198049269553003530035273693274782010020200302003003514511202011009910020100101000013101231222995430000101003003630036300363003630036
2020430035225000841000029893253010030100201001956198149269553003530035273693274782010020200302003003514511202011009910020100101000013101231222995430000101003003630036300363003630036
2020430035225000611000029893253010030100201001956198049269553003530035273693274782010020200302003003514511202011009910020100101002013101231222995430000101003003630036300363017330036
2020430218225036611000029893253010030100201001956198049269553003530217273693274782010020200302003003514511202011009910020100101001013101231222995430000101003003630036300363003630036
2020430035225009611000029893253010030100201001956198049269553003530035273693274782010020200302003003514511202011009910020100101000013101231222995430000101003003630036300363003630036
20204300352250006110000298932530100301002010019561980492695530035300352736932747820100202003020030035145112020110099100201001010001513101231222995430000101003003630036300363003630036
2020430035225000611000029893253010030100201001956198049269553003530035273693274782010020200302003003514511202011009910020100101000013101231222995430000101003003630036300363003630036

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 tlb miss (a1)cfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? int retires (ef)f5f6f7f8fd
200243003522506110000298912530010300102001019562890492695530035300352739132749820010200203002030035145112002110910200101001001270233232995830000100103003630036300363003630036
2002430035225010310000298912530010300102001019562890492695530035300352739132749820010200203002030035145112002110910200101001021270233222995830000100103003630036300363003630036
200243003522506110000298912530010300102001019562890492695530035300352739132749820010200203002030035145112002110910200101001001270233222995830000100103003630036300363003630036
200243003522506110000298912530010300102001019562890492695530035300352739132749820010200203002030035145112002110910200101001001270233222995830000100103003630036300363003630036
200243003522406110000298912530010300102001019562890492695530035300352739132749820010200203002030035145112002110910200101001001270233222995830000100103003630036300363003630036
200243003522506110000298912530010300102001019562890492695530035300352739132749820010200203002030035145112002110910200101001001270333322995830000100103003630036300363003630036
200243003522506110000298912530010300102001019562890492695530035300352739132749820010200203002030035145112002110910200101001001270233222995830000100103003630036300363003630036
200243003522506110000298912530010300102001019562890492695530035300352739132749820010200203002030035145112002110910200101001001270233222995830000100103003630036300363003630036
200243003522506110000298912530010300102001019562890492695530035300352739132749820010200203002030035145112002110910200101001001270233222995830000100103003630036300363003630036
20024300352246426110000298912530010300102001019562890492695530035300352739132749820010200203002030035145112002110910200101001001270233232995830000100103003630036300363003630036

Test 3: Latency 3->2

Chain cycles: 1

Code:

  cmn w0, w1, sxth
  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)1e3f4c4d51schedule 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)acbranch cond mispred nonspec (c5)cfd0d5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? int retires (ef)f5f6f7f8fd
2020430035225006110000298932530100301002010019561981492695530035300352736932747820100202003020030035145112020110099100201001010020013101331222995430000101003003630036300363003630036
2020430035225006110000298932530100301002010019561981492695530035300352736932747820100202003020030035145112020110099100201001010010013101231232995430000101003003630036300363003630036
2020430035225006110000298932530100301002010019561980492695530035300352736932747820100202003020030035145112020110099100201001010010013101331222995430000101003003630036300363003630036
2020430035225006110000298932530100301002010019561980492695530035300352736932747820100202003020030035145112020110099100201001010013013101331322995430000101003003630036300363003630036
2020430035225009410000298932530100301002010019561980492695530035300352736932747820100202003020030035145112020110099100201001010010013101331332995430000101003003630036300363003630036
2020430035225006110000298932530100301002010019561980492695530035300352736932747820100202003020030035145112020110099100201001010010013101331332995430000101003003630036300363003630036
2020430035225006110000298932530100301002010019561980492695530035300352736932747820100202003020030035145112020110099100201001010010013101331232995430000101003003630036300363003630036
2020430035225006110000298932530100301002010019561980492695530035300352736932747820100202003020030035145112020110099100201001010020013101231232995430000101003003630036300363003630036
20204300352250061100002989325301003010020100195619804926955300353003527369112747820100202003020030035145112020110099100201001010010013101231332995430000101003003630036300363012530036
2020430035225006110000298932530100301002010019561980492695530035300352736932747820100202003020030035145112020110099100201001010010113101331322995430000101003003630036300363003630036

1000 unrolls and 10 iterations

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

retire uop (01)cycle (02)03l1i tlb fill (04)mmu table walk data (08)09l2 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)l1d cache writeback (a8)a9acc2branch cond mispred nonspec (c5)cfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? int retires (ef)f5f6f7f8fd
200243003522500000000061100002989125300103001020010195628914926955300353003527391327498200102002030020300351451120021109102001010010000000001270133313122995830000100103003630036300363003630036
200243003522500000000061100002989125300353001020010195628904926955300353003527391327498200102002030020300351451120021109102001010010000000001270123311132995830000100103003630036300363003630036
20024300352250000000006110000298912530010300102001019562891492695530035300352739132749820010200203002030035145112002110910200101001000000000127012331352995830000100103003630036300363003630036
20024300352250000000006110000298912530010300102001019562891492695530035300352739132749820010200203002030035145112002110910200101001000000000127013331352995830000100103003630036300363003630036
200243003522500000000061100002989125300103001020010195628914926955300353003527391327498200102002030020300351451120021109102001010010000000001270123313122995830000100103003630036300363003630036
20024300352250000001830061100002989125300103001020010195628914926955300353003527391327498200102002030020300351451120021109102001010010000000001270123313132995830000100103003630036300363003630036
20024300352250000000001021100002989125300103001020010195628914926955300353003527391327498200102002030020300351451120021109102001010010000000001270133313112995830000100103003630036300363003630036
200243003522500000000061100122992625300103001020010195628914926955300353003527391327498200102002030020300351451120021109102001010010000000001270113312142995830000100103003630036300363003630036
200243003522500000000061100002989125300103001020010195628914926955300353003527391327498200102002030020300351451120021109102001010010000000001270113313112995830000100103003630036300363003630036
200243003522500000000061100002989125300103001020010195628904926955300353003527391327498200102002030020300351451120021109102001010010000000001270133312122995830000100103003630036300363003630036

Test 4: throughput

Count: 8

Code:

  cmn w0, w1, sxth
  cmn w0, w1, sxth
  cmn w0, w1, sxth
  cmn w0, w1, sxth
  cmn w0, w1, sxth
  cmn w0, w1, sxth
  cmn w0, w1, sxth
  cmn w0, w1, sxth
  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 instruction (07)mmu table walk data (08)09l2 tlb miss data (0b)18191e1f3f4c4d51schedule 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 tlb access (a0)l1d tlb miss (a1)ld unit uop (a6)l1d cache writeback (a8)a9acafc2cfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? int retires (ef)f5f6f7f8fd
802045345641500000000618000048741251601001601008010034400051495033005341053410432982063343360801008020016020053410781180201100991008010010000000000511042411533921600001005341153411534115341153411
802045341040000000000618000048741251601001601008010034400050495033005341053410432982060343360801008020016020053410781180201100991008010010000000000511012411533921600001005341153411534115341153411
802045341040000000000618000048741251601001601008010034400051495033005341053410432982063343360801008020016020053410781180201100991008010010000000000511012411533921600001005341153411534115341153411
8020453410400000000007268000048741251601001601008010034400050495033005341053410432982050343360801008020016020053410781180201100991008010010000000000511012411533921600001005341153411534115341153411
802045341040000000000618000048741251601001601008010034400050495033005341053410432982050343360801008020016020053410781180201100991008010010000000000511012411533921600001005341153411534115341153411
802045341041200000000618000048741251601001601008010034400050495033005341053410432982063343360801008020016020053410781180201100991008010010000000000511012411533921600001005341153411534115341153411
802045341040000000000618000048741251601001601008010034400051495033005341053410432982060343360801008020016020053410781180201100991008010010000000000511012411533921600001005341153411534115341153411
8020453410400000000180618000048741251601001601008010034400051495033005341053410432982063343360801008020016020053410781180201100991008010010000000000511012411533921600001005341153411534555341153411
802045341040000000000618000048741251601001601008010034400051495033005341053410432982050343360801008020016020053410781180201100991008010010000000000511012411533921600001005341153411534115341153411
802045341040000000000618000048741251601001601008010034400051495033005341053410432982050343360801008020016020053410781180201100991008010010000000000511012411533921600001005341153411534115341153411

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)181e3f4c4d51schedule 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)daddfetch restart (de)e0? int output thing (e9)ec? int retires (ef)f5f6f7f8fd
8002453401399000618000047946251600101600108001034381301495030053380533804329027073433528001080020160020533807811800211091080010100050200924057533591600000105338153381533815338153381
80024533803990007268000047946251600101600108001034381301495030053380533804329027073433528001080020160020533807811800211091080010100050200724077533591600000105338153381533815338153381
8002453380399000618000047946251600101600108001034381301495030053380533804329027073433528001080020160020533807811800211091080010100050200524057533591600000105338153381533815338153381
8002453380400000618000047946451600101600108001034381301495030053380533804329025623433528001080020160020533807811800211091080010101350200524057533591600000105338153381533815338153381
8002453380399000618000047946251600101600108001034381301495030053380534234329027073433528001080020160020533807811800211091080010100050200724057533591600000105338153381533815338153381
8002453380400000618000047946251600101600108001034381301494806753380533804329025623433528001080020160020533807811800211091080010100050200524057533591600000105338153381533815338153381
800245338040000885618000047946251600101600108001034381301495030053380533804329025623433528001080020160020533807811800211091080010100050200524075533591600000105338153489533815338153381
8002453380400000828003947946251600981600108011434400031495030053380533804329027073433528001080020160020533807811800211091080010101142050200524057533591600000105338153381533815338153381
8002453380400000618003747946251600101600108001034381301495030053380533804329027073433528001080020160020533807811800211091080010100050200724075533591600000105338153381533815338153381
800245338040000447618000047946251600101600108001034381301495030053380533804329027073433528001080020160020533807811800211091080010100050200524057533591600000105338153381533815338153381