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

ADD (uxtb, 64-bit)

Test 1: uops

Code:

  add x0, x0, 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)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)ld unit uop (a6)cfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? int retires (ef)f5f6f7f8fd
100420351506110001735252000200010003257012035203515753184210001000200020354211100110000732672217812000100020362036203620362036
100420351506110001735252000200010003257002035203515753184210001000200020354211100110000732672217812000100020362036203620362036
100420351506110001735252000200010003257012035203515753184210001000200020354211100110000732672217812000100020362036203620362036
100420351536110001735252000200010003257002035203515753184210001000200020354211100110000732672217812000100020362036203620362036
100420351506110001735252000200010003257012035203515753184210001000200020354211100110000732672217812000100020362036203620362036
100420351506110001735252000200010003257012035203515753184210001000200020354211100110000732672217812000100020362036203620362036
100420351506110001735252000200010003257012035203515753184210001000200020354211100110000732672217812000100020362036203620362036
100420351566110001735252000200010003257002035203515753184210001000200020354211100110000732672217812000100020362036203620362036
100420351506110001735252000200010003257002035203515753184210001000200020354211100110000732672217812000100020362036203620362036
100420351506110001735252000200010003257012035203515753184210001000200020354211100110000732672217812000100020362036203620362036

Test 2: Latency 1->2

Code:

  add x0, x0, w1, uxtb
  mov x0, 1
  mov x1, 2

(fused SUBS/B.cc loop)

100 unrolls and 100 iterations

Result (median cycles for code): 2.0035

retire uop (01)cycle (02)03mmu table walk instruction (07)l2 tlb miss instruction (0a)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)branch mispred nonspec (cb)cdcfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? int retires (ef)f5f6f7f8fd
1020420035150110611000019803252010020100101111849851491695520035200351847771873510111102322026420035421110201100991001010010013111719116111984820000101002003620036200362003620036
1020420035150110611000019803252010020100101111849850491695520035200351842931870010100102002020020035421110201100991001010010000000710259221979120000101002003620036200362003620036
102042003515000061100001980325201002010010100185342149169552003520035184293187001010010200202002003542111020110099100101001000144000710259221979120000101002003620036200362003620036
1020420035149000611000019803252010020100101001853420491695520035200351842931870010100102002020020035421110201100991001010010000000710259221979120000101002003620036200362003620036
1020420224150000611000019803252010020100101001853420491695520035200351842931870010100102002020020035421110201100991001010010000000710259221979120000101002003620036200362003620036
10204200351500006110000198032520100201001010018534204916955200352003518429318700101001020020200200354211102011009910010100100090000710259221979120000101002003620036200362003620036
10204200351500002511000019803252010020100101001853420491695520035200351842931870010100102002020020035421110201100991001010010016000710259221979120000101002003620036200362003620036
1020420035150000611000019803252010020100101001853420491695520035200351842931870010100102002020020035421110201100991001010010000000710259221979120000101002003620036200362003620036
1020420035150000611000019803252010020100101001853420491695520035200351842931870010100102002020020035421110201100991001010010000000710259221979120000101002003620079200362003620036
102042003515100098510000198032520100201001010018534204916955200352003518429318700101001020020200200354211102011009910010100100376000710259221979120000101002003620036200362003620036

1000 unrolls and 10 iterations

Result (median cycles for code): 2.0035

retire uop (01)cycle (02)0309l2 tlb miss data (0b)1e1f3f4c4d51schedule 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 tlb miss (a1)l1d cache writeback (a8)acbranch mispred nonspec (cb)cfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? int retires (ef)f5f6f7f8fd
1002420035150000061100001974325200102001010010185310049169550200352003518451318718100101002020020200354211100211091010010100700640263221979220000100102003620036200362003620036
100242003515000006110000197432520010200101001018531004916955020035200351845131871810010100202002020035421110021109101001010021230640263221979220000100102003620036200362003620036
1002420035150000061100001974325200102001010010185310049169550200352003518451318718100101002020020200354211100211091010010100000640263221979220000100102003620036200362003620036
10024200351500000611000019743252001020010100101853100491695502003520035184513187181001010020200202003542111002110910100101000600640263221979220000100102003620036200362003620036
1002420035149000061100001974325200102001010010185310049169550200352003518451318718100101002020020200354211100211091010010100000640263221979220000100102003620036200362003620036
1002420035150000061100001974325200102001010010185310049169550200352003518451318718100101002020020200354211100211091010010100200640263221979220000100102003620036200362003620036
1002420035150000061100001974325200102001010010185310049169550200352003518451318718100101002020020200354211100211091010010100000640263221979220000100102003620036200362003620036
1002420035150000061100001974325200102001010010185310049169550200352003518451318718100101002020020200354211100211091010010100000640263221979220000100102003620036200362003620036
1002420035150000061100001974325200102001010010185310049169550200352003518451318718100101002020020200354211100211091010010100000640263221979220000100102003620036200362003620036
1002420035150000061100001974325200102001010010185310049169550200352003518451318718100101002020020200354211100211091010010100000640263221979220000100102003620036200362003620036

Test 3: Latency 1->3

Code:

  add x0, x1, w0, uxtb
  mov x0, 1
  mov x1, 2

(fused SUBS/B.cc loop)

100 unrolls and 100 iterations

Result (median cycles for code): 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)accfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? int retires (ef)f5f6f7f8fd
10204200351500611000019803252010020100101001853421491695520035200351842931870010100102002020020035421110201100991001010010000710159111979120000101002003620036200362003620036
10204200351500611000019803252010020100101001853420491695520035200351842981871710100102002020020035421110201100991001010010000710159111979120000101002003620036200362003620036
10204200351500611000019803252010020100101001853420491695520035200351842931870010100102002020020035421110201100991001010010000710159111979120000101002003620036200362003620036
10204200351500611000019803252010020100101001853420491695520035200351842931870010100102002020020035421110201100991001010010010710159111979120000101002003620036200362003620036
10204200351500611000019803252010020100101001853420491695520035200351842931870010100102002020020035421110201100991001010010000710159111979120000101002003620036200362003620036
10204200351500611000019803252010020100101001853420491695520035200351842931870010100102002020020035421110201100991001010010000710159111979120000101002003620036200362003620036
102042003515006110000198032520100201001010018534204916955200352003518429318700101001020020200200354211102011009910010100100223710159111979120000101002003620036200362003620036
102042003515006110000198032520100201001010018534204916955200352003518429318700101001020020200200354211102011009910010100100563710159111979120000101002003620036200362003620036
10204200351500611000019803252010020100101001853421491695520035200351842931870010100102002020020035421110201100991001010010000710159111979120000101002003620036200362003620036
10204200351500611000019803252010020100101001853420491695520035200351842931870010100102002020020035421110201100991001010010000710159111979120000101002003620036200362003620036

1000 unrolls and 10 iterations

Result (median cycles for code): 2.0035

retire uop (01)cycle (02)03mmu table walk data (08)091e3f4c4d51schedule 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
100242003515000061100001974325200102001010010185310049169552003520035184513187181001010020200202003542111002110910100101000640263221979220000100102003620036200362003620036
100242003515000061100001974325200102001010010185310049169552003520035184513187181001010020200202003542111002110910100101020640263221979220000100102003620036200362003620036
1002420035150000726100001974325200102001010010185310149169552003520035184513187181001010020200202003542111002110910100101006640263221979220000100102003620036200362003620036
1002420035150000611000019743252001020010100101853100491695520035200351845131871810010100202002020035421110021109101001010018640263221979220000100102003620036200362003620036
100242003515000061100001974325200102001010010185310049169552003520035184983187181001010020200202003542111002110910100101000640263221979220000100102003620036200362003620036
100242003515000061100001974325200102001010010185310049169552003520035184513187181001010020200202003542111002110910100101000640263221979220000100102003620036200362003620036
100242003515000061100001974325200102001010010185310049169552003520035184513187181001010020200202003542111002110910100101000640263221979220000100102003620036200362003620036
100242003515000061100001974325200102001010010185310049169552003520035184513187181001010020200202003542111002110910100101000640263221979220000100102003620036200362003620036
100242006815000061100001974325200102001010010185310049169552003520035184513187181001010020200202003542111002110910100101006640263221979220000100102003620036200362003620036
100242003515000061100001974325200102001010010185310049169552003520035184513187181001010020200202003542111002110910100101010640263221979220000100102003620036200362003620036

Test 4: throughput

Count: 8

Code:

  add x0, x8, w9, uxtb
  add x1, x8, w9, uxtb
  add x2, x8, w9, uxtb
  add x3, x8, w9, uxtb
  add x4, x8, w9, uxtb
  add x5, x8, w9, uxtb
  add x6, x8, w9, uxtb
  add x7, x8, w9, uxtb
  mov x8, 9
  mov x9, 10

(fused SUBS/B.cc loop)

100 unrolls and 100 iterations

Result (median cycles for code divided by count): 0.3341

retire uop (01)cycle (02)031e1f3f4c4d51schedule 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)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
802042673220000288003126146281601821601828026216190614923652267322673216651816661802628037616055226732391180201100991008010010000003011151293160026728160082801002673326732267332673326733
8020426732200002188003126146281601821601828026216190604923652267322673216651816661802628037616055226732391180201100991008010010000000011151290160026729160082801002673326732267332673326733
802042673220000618000026094251601001601008010016431814923645267252672516615316677801008020016020026725391180201100991008010010000000000051101221126717160000801002672626726267262672626726
802042672520000618000026094251601001601008010016431814923703267252672516615316677801008020016020026725391180201100991008010010000000000051101221126717160000801002672626726267262672626726
802042672520000618000026094251601001601008010016431814923645267252672516615316677801008020016020026725391180201100991008010010000000000051101221126717160000801002672626726267262672626726
802042672520000618000026094251601001601008010016431814923645267252672516615316677801008020016020026725391180201100991008010010000000000051101221126717160231801002672626726267262672626726
802042672520000618000026094251601001601008010016431814923645267252672516615316677801008020016020026725391180201100991008010010000000000051101221126717160000801002672626726267262672626726
80204267252002040618000026094251601001601008010016431814923645267252672516615316677801008020016020026725391180201100991008010010000000000051101221126717160000801002672626726267262672626726
802042672520000618000026094251601001601008010016431814923645267252672516615316677801008020016020026725391180201100991008010010000000000051101221126717160000801002672626726267262672626726
802042672520000618000026094251601001601008010016431814923645267252672516615316677801008020016020026725391180201100991008010010000000000051101221126717160000801002672626726267262672626726

1000 unrolls and 10 iterations

Result (median cycles for code divided by count): 0.3339

retire uop (01)cycle (02)03mmu 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)5f60696a6b6d6emap stall dispatch (70)int prf full (71)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)a9acc2cfd5map dispatch bubble (d6)dbddfetch restart (de)e0? int output thing (e9)? int retires (ef)f5f6f7f8fd
80024267352000000000061800002128025160010160010800101631421149236313267112671116623031668580010800201600202671139118002110910800101000000005020722010526704160000800102671226712267122671226712
8002426711200000000006180000212802516001016001080010163142004923631026711267111662303166858001080020160020267113911800211091080010100000000502042204626704160000800102671226712267122671226712
80024267112000000012006180000212802516001016001080010163142004923631026711267111662303166858001080020160020267113911800211091080010100000000502042205726704160000800102671226712267122671226712
8002426711200000000006180000212802516001016001080010163142004923631026711267111662303166858001080020160020267113911800211091080010100000000502062205726704160000800102671226712267122671226712
8002426711200000000006180000212802516001016001080010163142004923688026768267111662303166858001080020160020267113911800211091080010100000000502042205626704160000800102671226712267122671226712
8002426711200000000006180000212802516001016001080010163142004923631026711267111662303166858001080020160020267113911800211091080010100000000502062207526704160000800102671226712267122671226712
8002426711200000000006180000212802516001016001080010163142004923631026711267111662303166858001080020160020267113911800211091080010100000000502062206426704160000800102671226712267122671226712
8002426711200000000006180000212802516001016001080010163142004923631026711267111662303166858001080020160020267113911800211091080010100000000502062206426704160000800102671226712267122671226712
8002426711200000000006180000212802516001016001080010163142014923631026711267111662303166858001080020160020267113911800211091080010100000000502062207726704160000800102671226712267122671226712
8002426711200000000006180000212802516001016001080010163142004923631026711267111662303166858001080020160020267113911800211091080010100000000502072206426704160000800102671226712267122671226712