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 (sxth, 64-bit)

Test 1: uops

Code:

  cmp x0, 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)cfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)f5f6f7f8fd
10047096061100030425200020001000408771709709498213561100010002000709781110011000073222226842000710710710710710
10047096061100030425200020001000408771709709498253561100010002000709781110011000073222226842000710710710710710
10047096061100030425200020001000408771709709498253561100010002000709781110011000073222226842000710710710710710
10047095082100030425200020001000408771709709498253561100010002000709781110011000073222226842000710710710710710
10047095082100030425200020001000408771709709498213561100010002000709781110011000073222226842000710710710710710
10047095061100030425200020001000408771709709498213561100010002000709781110011000073222226842000710710710710710
10047095061100030425200020001000408771709709498213561100010002000709781110011000073222226842000710710710710710
10047095061100030425200020001000408771709709498213561100010002000709781110011000073222226842000710710710710710
10047095082100030425200020001000408771709709498253561100010002000709781110011000073222226842000710710710710710
10047095061100030425200020001000408771709709498253561100010002000709781110011000073222226842000710710710710710

Test 2: Latency 3->1

Chain cycles: 1

Code:

  cmp x0, 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)03091e3f4c4d51schedule 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)ld unit uop (a6)l1d cache writeback (a8)a9acc2branch cond mispred nonspec (c5)branch mispred nonspec (cb)cdcfd0d5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? int retires (ef)f5f6f7f8fd
2020430035225006110000298992530100301002010719562401492695530035300352739162748720107202243023630035145112020110099100201001010000000011113180116112998130000101003003630036300363003630036
20204300352250053610000298992530100301002010719562401492695530035300352739162748720107202243023630035145112020110099100201001010000000011113180116112998130000101003003630036300363003630036
20204300352250072610000298992530100301002010719562401492695530035300352739162748720107202243023630035145112020110099100201001010000000011113180116112998130000101003003630036300363003630036
20204300352240053610000298992530100301002010719562401492695530035300352739162748720107202243023630035145112020110099100201001010000000011113180116112998130000101003003630036300363003630036
20204300352250044110000298932530100301002010019561981492695530035300352736932747820100202003020030035145112020110099100201001010000000000013101331222995430000101003003630036300363003630036
2020430035225066110000298932530100301002010019561981492695530035300352736932747820100202003020030035145112020110099100201001010000000000013101231222995430000101003003630036300363003630036
2020430035225006110000298932530100301002010019561981492695530035300352736932747820100202003020030035145112020110099100201001010010010000013101231222995430000101003003630036300363003630036
20204300352250072610000298932530100301002010019561981492695530035300352736932747820100202003033130081145112020110099100201001010000000000013101231222995430000101003003630036300363003630036
2020430035225006110000298932530100301002010019561981492695530035300352736932747820100202003020030035145112020110099100201001010000000000013101231222995430000101003003630036300363003630036
2020430035225006110000298932530100301002010019561981492695530035300352736932747820100202003020030035145112020110099100201001010000000000013101231222995430000101003003630036300363003630036

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 access (a0)l1d cache writeback (a8)a9acbranch mispred nonspec (cb)cfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)ea? int retires (ef)f5f6f7f8fd
20024300352250611000029891253001030010200101956289149269553003530035273913274982001020128300203003514511200211091020010100100000012703332229958300000100103003630036300363003630036
200243003522503461000029891253001030010200101956289049269553003530035273913274982001020020300203003514511200211091020010100100000012702332229958300000100103003630036300363003630036
20024300352250611000029891253001030010200101956289149269553003530035273913274982001020020300203003514511200211091020010100100006012702332229958300000100103003630036300363003630036
20024300352250611000029891253001030010200101956289149269553003530035273913274982001020020300203003514511200211091020010100100000012702332229958300000100103003630036300363003630036
20024300352250611000029891253001030010200101956289049269553003530035273913274982001020020300203003514511200211091020010100100000012702332229958300000100103003630036300363003630036
20024300352250611000029891253001030010200101956289149269553003530035273913274982001020020300203003514511200211091020010100100000012702332229958300000100103003630036300363003630036
200243003522504411000029891253001030010200101956289049269553003530035273913274982001020020300203003514511200211091020010100100000012702332229958300000100103003630036300363003630036
20024300352250611000029891253001030010200101956289149269553003530035273913274982001020020300203003514511200211091020010100100020012702333229958300000100103003630036300363003630036
20024300352250611000029891253001030010200101956289049269553003530035273913274982001020020300203003514511200211091020010100100000012702332329958300000100103003630036300363003630036
20024300352250611000029891253001030010200101956289149269553003530035273913274982001020020300203003514511200211091020010100100000012702332229958300000100103003630036300363003630036

Test 3: Latency 3->2

Chain cycles: 1

Code:

  cmp x0, 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)03l2 tlb miss data (0b)181e1f3a3f4c4d51schedule 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 tlb access (a0)l1d tlb miss (a1)l1d cache writeback (a8)a9accfd0d5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? int retires (ef)f5f6f7f8fd
2020430035225000001741100002989325301003010020100195619849269553003530035273693274782010020200302003003514511202011009910020100101000000013101231222995430000101003003630036300363003630036
20204300352250093007261000029893253010030100201001956198492695530035300352736913274782010020200302003003514511202011009910020100101000000013101231222995430000101003003630036300363003630036
202043003522500000536100002989325301003010020100195619849269553003530035273693274782010020200302003003514511202011009910020100101000000013101231222995430000101003003630036300363003630036
20204300352250000061100002989325301003010020100195619849269553003530035273693274782010020200302003003514511202011009910020100101000000013101231222995430000101003003630036300363003630036
20204300352250000061100002989325301003010020100195619849269553003530035273693274782010020200302003003514511202011009910020100101000000013101231222995430000101003003630036300363003630036
202043003522500000103100002989325301003010020100195619849269553003530035273693274782010020200302003003514511202011009910020100101000000013101231222995430000101003003630036300363003630036
20204300352250000061100002989325301003010020100195619849269553003530035273693274782010020200302003003514511202011009910020100101000000013101231222995430000101003003630036300363003630036
20204300352240300061100002989325301003010020100195619849269553003530035273693274782010020200302003003514511202011009910020100101000000013101231322995430000101003003630036300363003630036
20204300352240000061100002989325301003010020100195619849269553003530035273693274782010020200302003003514511202011009910020100101000000013101231222995430000101003003630036300363003630036
20204300352250000061100002989325301003010020100195619849269553003530035273693274782010020200302003003514511202011009910020100101000000013101231222995430000101003003630036300363003630036

1000 unrolls and 10 iterations

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

retire uop (01)cycle (02)03091e3f4c4d51schedule 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)accfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)ea? int retires (ef)f5f6f7f8fd
2002430035225006110000298912530010300102001019562890492695530035300352739132749820010200203002030035145112002110910200101001000012701331129958300000100103003630036300363003630036
2002430035225006110000298912530010300102001019562890492695530035300352739132749820010200203002030035145112002110910200101001000012701331129958300000100103003630036300363003630036
2002430035225006110000298912530010300102001019562890492695530035300352739132749820010200203002030035145112002110910200101001000012701331129958300000100103003630036300363003630036
2002430035225036110000298912530010300102001019562890492695530035300352739132749820010200203002030035145112002110910200101001000012702331129958300000100103003630036300363003630036
2002430035225008210000298912530010300102001019562890492695530035300352739132749820010200203002030035145112002110910200101001000012701331129958300000100103003630036300363003630036
2002430035225006110000298912530010300102001019562890492695530035300352739132749820010200203002030035145112002110910200101001000012701331129958300000100103003630036300363003630036
2002430035224006110000298912530010300102001019562890492695530035300352739132749820010200203002030035145112002110910200101001000012701331129958300000100103003630036300363003630036
2002430035225006110000298912530010300102001019562890492695530035300352739132749820010200203002030035145112002110910200101001000012701331129958300000100103003630036300363003630036
2002430035225006110000298912530010300102001019562890492695530035300352739132749820010200203002030066145112002110910200101001000012702331129958300000100103003630036300363003630036
2002430035225006110000298912530010300102001019562891492695530035300352739132749820010200203002030035145112002110910200101001000012701331129958300000100103003630036300363003630036

Test 4: throughput

Count: 8

Code:

  cmp x0, w1, sxth
  cmp x0, w1, sxth
  cmp x0, w1, sxth
  cmp x0, w1, sxth
  cmp x0, w1, sxth
  cmp x0, w1, sxth
  cmp x0, w1, sxth
  cmp x0, 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)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 tlb miss (a1)acc2branch cond mispred nonspec (c5)branch mispred nonspec (cb)cdcfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? int retires (ef)f5f6f7f8fd
802045343940133288001348791271601371601378017634418901495033253412534124334520606433558017680288160376534127811802011009910080100100000111512201600534091600371005341353413534135341353413
8020453412400219288001348791271601371601378017634418900495033253412534124334520636433558017680288160376534127811802011009910080100100000111512201600534091600371005341353413534135341353413
80204534124000288001348791271601371601378017634418900495033253412534124334520636433558017680288160376534127811802011009910080100100030111512201600534091600371005341353413534135341353413
80204534124000288001348791271601371604108017634418900495033253412534124334520636433558017680288160376534127811802011009910080100100000111512201600534091600371005341353413534135341353413
802045341240002880013487912716010016010080100344000504950330534105341043298206319433608010080200160200534107811802011009910080100100000000511012411533921600001005341153411534115341153411
80204534104000618000048741251601001601008010034400050495033053410534104329820603433608010080200160200534107811802011009910080100100000000511012411533921600001005341153411534115341153411
802045341040097268000048741251601001601008010034400050495033053410534104329820603433608010080200160200534107811802011009910080100100000000511012411533921600001005341153411534115341153411
80204534104000618000048741251601001601008010034400051495033053410534104329820633433608010080200160200534107811802011009910080100100000000511012411533921600001005341153411534115341153411
80204534104000618000048741251601001601008010034400050495033053410534104329820633433608010080200160200534107811802011009910080100100000000511012411533921600001005341153411534115341153411
80204534104000618000048741251601001601008010034400050495033053456534104329820503433608010080200160200534107811802011009910080100100000000511012411533921600001005341153411534115341153411

1000 unrolls and 10 iterations

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

retire uop (01)cycle (02)03mmu table walk instruction (07)mmu table walk data (08)09l2 tlb miss instruction (0a)l2 tlb miss data (0b)18191e1f3a3f4c4d51schedule uop (52)schedule int uop (53)dispatch int uop (56)int uops in schedulers (59)5f6061696a6d6emap 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)a9acc2cfd0d2l1i cache miss demand (d3)d5map dispatch bubble (d6)daddfetch restart (de)e0? int output thing (e9)? int retires (ef)f5f6f7f8fd
80024534014000000000000862800004794625160010160010800103438130000495030053380533804329024603433528001280237160020533807811800211091080010100000000502000012401153359160000105338153381533815338153381
80024533804001000000000216800004794625160010160010800103438130000495030053380533804329025623433528001080020160020533807811800211091080010100000000502000012401153359160002105338153381533815338153381
800245338040000000002700168800004794625160010160010800103438130000495030053380533804329025623433528001080020160020533807811800211091080010100000000502000012401153359160002105338153381533815338153381
80024533803990000000000191800004794625160010160010800103438130000495030053380533804329027073433528001080020160020533807811800211091080010100000000502250012401153359160000105338153381533815338153381
80024533803990000000000105800004794625160010160010800123438130000495030053380533804329025623433528001080020160020533807811800211091080010100000000502000012401153359160000105338153381533815338153381
80024533804000000000000103800004794625160010160010800103438130000495030053380533804329027073433528011180020160020533807811800211091080010100000000502000012401153359160000105338153381533815338153423
80024533804000000000000191800004794625160010160010800103438130000495030053380533804329027073433528001080020160020533808211800211091080010100000000502000012401153359160000105338153381533815338153381
80024533804000000000000191800004794625160010160010800103438130015495030053380533804329027073433528001080020160020533807811800211091080010100000000502000012401153359160000105338153381533815338153381
80024533804000000000000191800004794625160010160010800103438130000495030053380533804329025623433528001280020160020533807811800211091080010100000000502000012401153359160000105338153381533815338153381
80024533804000000000000191800004794625160010160010800103438130000495030053380533804329025623433528001080020160020533807811800211091080010100000000502000012401153359160000105338153381533815338153381