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 (sxtw, 64-bit)

Test 1: uops

Code:

  cmp 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)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)accfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)f5f6f7f8fd
1004709506110003042520002000100040877709709498213561100010002000709781110011000073122116842000710710710710710
1004709506110003042520002000100040877709709498253561100010002000709781110011000073122116842000710710710710710
1004709506110003042520002000100040877709709498213561100010002000709781110011000073122116842000710710710710710
1004709506110003042520002000100040877709709498213561100010002000709781110011000073122116842000710710710710710
10047095015110003042520002000100040877709709498253561100010002000709781110011000073122116842000710710710710710
1004709506110003042520002000100040877709709498213561100010002000709781110011000073122116842000710710710710710
1004709506110003042520002000100040877709709498253561100010002000709781110011000073122116842000710710710710710
1004709506110003042520002000100040877709709498253561100010002000709781110011000073122116842000710710710710710
1004709506110003042520002000100040877709709498253561100010002000709781110011000073122116842000710710710710710
1004709506110003042520002000100040877709709498253561100010002000709781110011000073122116842000710710710710710

Test 2: Latency 3->1

Chain cycles: 1

Code:

  cmp 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)03191e1f3a3f4c4d51schedule 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)a9accfd0d5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? int retires (ef)f5f6f7f8fd
202043003522500006110000298932530100301002010019561981492695530035300352736932747820100202003020030035145112020110099100201001010000013101231222995430000101003003630036300363003630036
202043003522500006110000298932530100301002010019561981492695530035300352736932747820100202003020030035145112020110099100201001010000013101231222995430000101003003630036300363003630036
202043003522500006110000298932530100301002010019561981492695530035300352736932747820100202003020030035145112020110099100201001010000013101231322995430000101003003630036300363003630036
202043003522500006110000298932530100301002010019561981492695530035300352736932747820100202003020030035145112020110099100201001010000013101231222995430000101003003630036300363003630036
202043003522500006110000298932530100301002010019561981492695530035300352736932747820100202003020030035145112020110099100201001010000013101231222995430000101003003630036300363003630036
2020430035225000041910000298932530100301002010019561981492695530035300352736932747820100202003020030035145112020110099100201001010000013101231222995430000101003003630036300363003630036
2020430035225000036910000298932530100301002010019561981492695530035300352736932747820100202003020030035145112020110099100201001010000013101231222995430000101003003630036300363003630036
2020430035225000061100002989325301003010020100195619814926955300353003527369327478201002020030200300351451120201100991002010010100001813101231222995430000101003003630036300363003630036
2020430035225000010310000298934730100301002010019583071492695530035300352736932747820100202003020030035145112020110099100201001010000013101231222995430000101003003630036300363003630036
202043003522500006110000298932530100301002010019561980492695530035300352736932747820100202003020030035145112020110099100201001010000013351231222995430000101003003630036300363003630036

1000 unrolls and 10 iterations

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

retire uop (01)cycle (02)03mmu table walk data (08)l2 tlb miss data (0b)3f4c4d51schedule 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)acbranch cond mispred nonspec (c5)cfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? int retires (ef)f5f6f7f8fd
200243003522500201510000298912530010300102001019562891492695530035300352739132749820010200203002030035145112002110910200101001000001270133112995830000100103003630036300363003630036
2002430035225006110000298912530010300102001019562891492695530035300352739132749820010201363002030035145112002110910200101001000001270133112995830000100103003630036300363003630036
2002430035225006110000298912530010300102001019562891492695530035300352739162749820010200203002030035145112002110910200101001000001270133112995830000100103003630036300363003630036
2002430035225006110000298912530010300342001019562891492695530035300352739132749820010200203002030035145112002110910200101001000001270133112995830000100103003630036300363003630036
2002430035224006110000298912530010300102001019562891492695530035300352739132749820010200203002030035145112002110910200101001000001270133112995830000100103003630036300363003630036
200243003522500495210000298912530010300102001019562891492695530035300352739132749820010200203002030035145112002110910200101001000001270133112995830000100103003630036300363003630036
2002430035225006110000298912530010300102001019562891492695530035300352739132749820010200203002030035145112002110910200101001000001270133112995830000100103003630036300363003630036
2002430035225016110000298912530010300102001019562891492695530081300352739132749820010200203002030035145112002110910200101001000011270133112995830000100103003630036300363003630036
2002430035225006110000298912530010300102001019562891492695530035300352739132749820010200203002030035145112002110910200101001000001270133112995830000100103003630036300363003630036
2002430035225006110000298912530010300102001019562891492695530035300352739132749820010200203002030035145112002110910200101001000001270133112995830000100103003630036300363003630036

Test 3: Latency 3->2

Chain cycles: 1

Code:

  cmp 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)03l2 tlb miss data (0b)18191e1f3f4c4d51schedule 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
202043003522600000231100002989325301003010020100195619849269553003530035273693274782010020200302003003514511202011009910020100101000040013100331222995430000101003003630036300363003630036
2020430035225000120103100002989345301003010020100195619849269553003530035273693274782010020200302003003514511202011009910020100101000000013100231232995430000101003017330036300363003630036
202043003522500012061100002989325301003010020100195619849269553003530035273693274782010020200302003003514511202011009910020100101000000013101231222995430000101003003630036300363003630036
20204300352250000061100002989325301003010020100195619849269553003530035273693274782010020200302003003514511202011009910020100101000000013101231222995430000101003003630036300363003630036
20204301252250000061100002989325301003010020100195619849269553003530035273693274782010020200302003003514511202011009910020100101000030013101231222995430000101003003630036300363003630036
20204300352250000061100002989325301003010020100195619849269553003530035273693274782010020200302003003514511202011009910020100101000000013101233222995430000101003003630036300363003630036
20204300352240040061100002989325301773010020100195619849269553003530035273693274782010020200302003003514511202011009910020100101000000013101331222995430000101003003630036300363003630036
20204300352251000061100002989325301003010020182195619849269553003530035273693274782010020200302003003514511202011009910020100101000000013101231222995430000101003003630036300363003630036
20204300352240000061100002989325301003021120100195619849269553003530035273693274782010020200302003003514511202011009910020100101000001013101231222995430000101003003630036300363003630036
20204300352250000061100002989325301003010020100195619849269553003530035273693274782010020200302003003514511202011009910020100101000000013101249222995430000101003003630036300363003630036

1000 unrolls and 10 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)l2 tlb miss data (0b)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)accfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? int retires (ef)f5f6f7f8fd
2002430035224000061100002989125300103001020010195628914926955300353003527391327498200102002030020300351451120021109102001010010001270233222995830000100103003630036300363003630036
2002430035225000061100002989125300103001020010195628914926955300353003527391327498200102002030020300351451120021109102001010010001270133123001330000100103003630036300363003630036
2002430035225000061100002989125300103001020010195628904926955300353003527391327498200102002030020300351451120021109102001010010001270233122995830000100103003630036300363003630036
2002430035225010061100002989125300103001020010195628904926955300353003527391327498200102002030020300351451120021109102001010010001270133122995830000100103003630036300363003630036
2002430035225000061100002989125300103001020010195628904926955300353003527391327498200102002030020300351451120021109102001010010001270233222995830000100103003630036300363003630036
2002430035225000061100002989125300103001020010195628904926955300353003527391327498200102002030020300351451120021109102001010010001270233212995830000100103003630036300363003630036
200243003522500001051000029891253001030010200101956289049269553003530035273913274982001020020300203003514511200211091020010100100451270333222995830000100103003630036300363003630036
2002430035224000061100002989125300103001020010195628904926955300353003527391327498200102002030020300351451120021109102001010010001270233122995830000100103003630036300363003630036
2002430035225000061100002989125300103001020010195628904926955300353003527391327498200102002030020300351451120022109102001010010001270233212995830000100103003630036300363003630036
2002430035225000061100002989125300103001020010195628904926955300353003527391327498200102002030020300351451120021109102001010010001270233212995830000100103003630036300363003630036

Test 4: throughput

Count: 8

Code:

  cmp x0, w1, sxtw
  cmp x0, w1, sxtw
  cmp x0, w1, sxtw
  cmp x0, w1, sxtw
  cmp x0, w1, sxtw
  cmp x0, w1, sxtw
  cmp x0, w1, sxtw
  cmp 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)031e3f4c4d51schedule 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)9facc2branch mispred nonspec (cb)cfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? int retires (ef)f5f6f7f8fd
802045345540008480000487412516010016010080100344000514950330053410534104329820603433608010080200160200534107811802011009910080100100000511032411533921600001005341153411534115341153411
802045341040006180000487412516010016010080100344000504950330053410534104329820633433608010080200160200534107811802011009910080100100000511012411533921600001005341153411534115341153411
8020453410400077080000487412516010016010080100344000504950330053410534104329820633433608010080200160200534107811802011009910080100100000511012411533921600001005341153411534115341153411
802045341040006180000487412516010016010080100344000504950330053410534104329820503433608010080632160200534107811802011009910080100100000511012411533921600001005341153411534115341153411
802045341040006180000487412516010016010080100344000504950330053410534104329820633433608010080200160200534107811802011009910080100100300511012411533921600001005341153411534115341153411
802045341040006180000487412516010016010080100344000504950330053410534104329820503433608010080200160200534107811802011009910080100100020511012411533921600001005341153411534115341153411
802045341040006180000487412516010016010080100344000504950330053410534104329820633433608010080200160200534107811802011009910080100100000511012411533921600001005341153411534115341153411
802045341040006180000487412516010016010080100344000504950330053410534104329820603434888010080200160200534107811802011009910080100100000511012411533921600001005341153411534115341153411
802045341040006180000487412516010016010080100344000504950330053410534104329820633433608010080200160200534107811802011009910080100100000511012411533921600001005341153411534115341153411
802045341040006180000487412516010016010080100344000504950330053410534104329820633433608010080200160200534107811802011009910080100100000511012411534371600001005341153411534115341153411

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)191e3f4c4d51schedule 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)d9ddfetch restart (de)e0? int output thing (e9)ea? int retires (ef)f5f6f7f8fd
800245340139904061800004794625160010160010800103438130049503005338053380432902707343352800108002016002053380781180021109108001010026705020124011533591600000105338153381533815338153421
80024533804000012618000047946251600101600108001034381300495030053380533804329027073433528001080020160020533807811800211091080010100005020124011533591600000105338153381533815338153381
8002453380400000618000047946251600101600108001034381301495030053380533804329027073433528001080020160020533807811800211091080010100005020124011533591600000105338153381533815338153381
8002453380400003618000047946251600101600108001034381301495030053380533804329025623433528001080020160020533807811800211091080010100005020124011533591600000105338153381533815338153381
8002453380399000618000047946251600101600108001034381301495030053380533804329027073433528001080020160020533807811800211091080010100005020124011533591600000105338153381533815338153381
8002453380400000618000047946251600101600108001034381301495030053380533804329027073433528001080020160020533807811800211091080010100005020124011533591600000105338153381534245338153381
80024533804000007268000047946251600101600108001034381301495030053380533804329025623433528001080020160020533807811800211091080010100005051124011533591600000105338153381533815338153381
80024533804000006180000479462516001016001080010343813014950300533805338043290256234335280010800201600205338078118002110910800101007505020124011533591600000105338153381533815338153381
8002453380399000618000047946251600101600108001034381301495030053380533804329027073433528001080020160020533807811800211091080010100005020124011533591600000105338153381533815338153381
800245338040000061800004794625160010160010800103438130149503005338053380432902707343352800108002016002053380781180021109108001010026405020124011533591600000105338153381533815338153381