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 (sxtw, 64-bit)

Test 1: uops

Code:

  add x0, 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)031e3a3f4c4d51schedule 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)l1d cache writeback (a8)accfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? int retires (ef)f5f6f7f8fd
10042035150061100017352520002000100032570120352035157531842100010002000203542111001100010732672217812000100020362036203620362036
10042035169061100017352520002000100032570120352035157531842100010002000203542111001100000732672217812000100020362036203620362036
10042035150061100017352520002000100032570120352035157531842100010002000203542111001100000732672217812000100020362036203620362036
10042035150061100017352520002000100032570020352035157531842100010002000203542111001100000732672217812000100020362036203620362036
10042035150061100017352520002000100032570120352035157531842100010002000203542111001100000732672217812000100020362036203620362036
10042035150061100017352520002000100032570120352035157531842100010002000203542111001100000732672217812000100020362036203620822036
10042035150061100017352520002000100032570120352035157531842100010002000203542111001100000732672217812000100020362036203620362036
10042035150061100017352520002000100032570020352035157531842100010002000203542111001100000732672217812000100020362036203620362036
10042035150061100017352520002000100032570120352035157531842100010002000203542111001100000732672217812000100020362036203620362036
100420351515061100017352520002000100032570120352035157531842100010002000203542111001100001760732672217812000100020362036203620362036

Test 2: Latency 1->2

Code:

  add x0, x0, w1, sxtw
  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 data (08)1e3f4c4d51schedule 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)9fst unit uop (a7)l1d cache writeback (a8)acbranch cond mispred nonspec (c5)cfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? int retires (ef)f5f6f7f8fd
1020420035150006110000198032520100201001010018534249169552003520035184293187001010010200202002003542111020110099100101001000000710259221979120000101002003620036200362003620036
1020420035150006110000198032520100201001010018534249169552003520035184293187001010010200202002003542111020110099100101001000060710259221979120000101002003620036200362003620036
1020420035150008410009198032520100201001010018534249169552003520035184293187001010010200202002003542111020110099100101001000000710259221979120000101002003620036200362003620036
1020420035150006110000198032520100201001010018534249169552003520035184293187001010010200202002003542111020110099100101001000000710259221979120000101002003620036200362003620036
1020420035150006110000198032520100201001010018534249169552003520035184293187001010010200202002003542111020110099100101001000000710259221979120000101002003620036200362003620036
1020420035150008210000198032520100201001010018534249169552003520035184293187001010010200202002003542111020110099100101001000000710259221979120000101002003620036200362003620036
1020420035150006110000198032520100201001010018534249169552003520035184293187001010010200202002003542111020110099100101001000000710259221979120000101002003620036200362003620036
1020420035150006110000198032520100201001010018534249169552003520035184293187001010010200202002003542111020110099100101001000000710259221979120000101002003620036200362003620036
10204200351500021010000198032520100201001010018534249169552003520035184293187001010010200202002003542111020110099100101001000000710259221979120000101002003620036200362003620036
10204200351490021210000198032520100201241010018721749169552003520035184293187001010010200202002003542111020110099100101001000000710259221979120000101002003620036200362003620036

1000 unrolls and 10 iterations

Result (median cycles for code): 2.0035

retire uop (01)cycle (02)03mmu table walk data (08)l2 tlb miss data (0b)18191e1f3f4c4d51schedule 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)st unit uop (a7)l1d cache writeback (a8)a9acc2branch mispred nonspec (cb)cfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? int retires (ef)f5f6f7f8fd
10024200351490000004841000019743252001020010100101853101491695520035200351845131871810010100202002020035421110021109101001010000000000640263221979220000100102007920036200362003620036
1002420035150000000611000019743252001020010100101853101491695520035200351845131871810010100202002020035421110021109101001010000000000640263221979220000100102003620036200362003620036
1002420035150000000611000019743252001020010100101853101491695520035200351845131871810010100202002020035421110021109101001010000010300640263221979220000100102003620036200362003620036
10024200351490000001241000019743252001020010100101853101491695520035200351845131871810010100202002020035421110021109101001010000020000640263221979220000100102003620036200362003620036
10024200351500000005321000019743252001020010100101853101491695520035200351845131871810010100202002020035421110021109101001010000000000640263221979220000100102003620036200362003620036
1002420035150000000611000019743252001020010100101853101491695520035200351845131871810010100202002020035421110021109101001010000000000640263221979220000100102003620036200362003620036
100242003515000000012181000019743252001020010100101853101491695520035200351845131871810010100202002020035421110021109101001010000000000640263221979220000100102003620036200362003620036
1002420035150000000821000019743252001020010100101853101491695520035200351845131871810010100202002020035421110021109101001010000000000640263231979220000100102003620036200362003620036
1002420035150000100611000019743252001020010100101853101491695520035200351845131871810010100202002020035421110021109101001010000000000640263241979220000100102003620036200362003620036
1002420035150000000841000019743252001020010100101853101491695520035200351845131871810010100202002020035421110021109101001010000000000640263231979220000100102003620036200362003620036

Test 3: Latency 1->3

Code:

  add x0, x1, w0, sxtw
  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)03181e3f4c4d51schedule 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
102042003515000821000019803252010020100101001853421491695520035200351842931870010100102002020020035421110201100991001010010000710259211979120000101002003620036200362003620036
1020420035150001451000019803252010020100101001853420491695520035200351842931870010100102002020020035421110201100991001010010000710259221979120000101002003620036200362003620036
102042003515000611000019803252010020100101001853420491695520035200351842931870010100102002020020035421110201100991001010010000710259221979120000101002003620036200362003620036
102042003515000821000019803252010020100101001853421491695520035200351842931870010100102002020020035421110201100991001010010000710259221979120000101002003620036200362003620036
102042003515000841000019803252010020100101001853421491695520035200351842931870010100102002020020035421110201100991001010010000710259221979120000101002003620036200362003620036
102042003515000611000019803252010020100101001853420491695520035200351842931870010100102002020020035421110201100991001010010000710259221979120000101002003620036200362003620036
102042003515000611000019803252010020100101001853421491695520035200351842931870010100102002020020035421110201100991001010010000710259221979120000101002003620036200362003620036
102042003515000611000019803252010020100101001853420491695520035200351842931870010100102002020020035421110201100991001010010000710259221979120000101002003620036200362003620036
102042003515000611000019803252010020100101001853420491695520035200351842931870010100102002020020035421110201100991001010010000710259221979120000101002003620036200362003620036
102042003514900611000019803252010020100101001853421491695520035200351842931870010100102002020020035421110201100991001010010000710259221979120000101002003620036200362003620036

1000 unrolls and 10 iterations

Result (median cycles for code): 2.0035

retire uop (01)cycle (02)03mmu 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)a9acc2cfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? int retires (ef)f5f6f7f8fd
1002420035150002076110000197432520010200101001018531004916955200352003518451318718100101002020020200354211100211091010010100000640263221979220000100102003620036200362003620036
100242003515000276110000197432520010200101001018531004916955200352003518451318718100101002020020200354211100211091010010100000640263221979220000100102003620036200362003620036
1002420035150003036110000197432520010200101001018531004916955200352003518451318718100101002020020200354211100211091010010100000640263221979220000100102003620036200362003620036
10024200351500049825110000197432520010200101001018531004916955200352003518451318718100101002020020200354211100211091010010100030640263221979220000100102003620036200362003620036
100242003514900276110000197432520010200101001018531004916955200352003518451318718100101002020020200354211100211091010010100000640263221979220000100102003620036200362003620080
10024200351500006110000197432520010200101001018531004916955200352003518451318718100101002020020200354211100211091010010100000640263221979220000100102003620036200362003620036
100242003515000156110000197432520010200101001018531004916955200352003518451318718100101002020020200354211100211091010010100000640263221979220000100102003620036200362003620036
10024200351500006110000197432520010200101001018531004916955200352003518451318718100101002020020200354211100211091010010100000640263221979220000100102003620036200362003620036
1002420035150001815610000197432520010200101001018531004916955200352003518451318718100101002020020200354211100211091010010100000640263221979220000100102003620036200362003620036
100242003514900156110000197432520010200101001018531004916955200352003518451318718100101002020020200354211100211091010010100000640263221979220000100102003620036200362003620036

Test 4: throughput

Count: 8

Code:

  add x0, x8, w9, sxtw
  add x1, x8, w9, sxtw
  add x2, x8, w9, sxtw
  add x3, x8, w9, sxtw
  add x4, x8, w9, sxtw
  add x5, x8, w9, sxtw
  add x6, x8, w9, sxtw
  add x7, x8, w9, sxtw
  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)031e3f4c4d51schedule uop (52)schedule int uop (53)dispatch int uop (56)int uops in schedulers (59)67696a6d6emap 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)9faccfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? int retires (ef)f5f6f7f8fd
8020426767200276180000260942516010016010080100164318049236452672526963166153166778010080200160200267253911802011009910080100100051102221126717160000801002672626726267262672626726
802042672520006180000260942516010016010080100164318049236452672526725166153166778010080200160200267253911802011009910080100100051101221126717160000801002672626726267262672626726
802042672520006180000260942516010016010080100164318049236452672526725166153166778010080200160200267253911802011009910080100100051101221126717160000801002672626726267262672626726
802042672520006180000260942516010016010080100164318049236452672526725166153166778010080200160200267253911802011009910080100100051101221126717160000801002672626726267262672626726
802042672520006180000260942516010016010080100164318049236452672526725166153166778010080200160200267253911802011009910080100100051101221126717160000801002672626726267262672626726
8020426725200015680000260942516010016010080100164318049236452684926725166153166778010080200160200267253911802011009910080100100051101221126717160000801002672626726267262672626726
80204267252003336180000260942516010016010080100164318049236452672526725166153166778010080200160200267253911802011009910080100100051101221126717160000801002672626726267262672626726
802042672520006180000260942516010016010080100164318049236452672526725166153166778010080200160200267253911802011009910080100100051101221126717160000801002672626726267262672626726
802042672520006180000260942516010016010080100164318049236452672526725166153166778010080200160200267253911802011009910080100100051101221126717160000801002672626726267262672626726
802042672520006180000260942516010016010080100164318049236452672526725166153166778010080200160200267253911802011009910080100100051101221126717160000801002672626726267262672626726

1000 unrolls and 10 iterations

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

retire uop (01)cycle (02)03181e3f4c4d51schedule 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)ld unit uop (a6)l1d cache writeback (a8)a9acc2branch mispred nonspec (cb)cfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? int retires (ef)f5f6f7f8fd
800242673420000618000021280251600101600108001016314249236312671126711166233166858001080020160020267113911800211091080010100000000050206225626704160000800102671226712267122671226712
800242671120009618000021280251600101600108001016314249236312671126711166233166858001080020160020267113911800211091080010100000000050206225826704160000800102671226712267122671226712
800242671120000618000021280251600101600108001016314249236312671126711166233166858001080020160020267113911800211091080010100000000050207179626704160000800102671226712267122671226712
800242671120000828000021280251600101600108001016314249236312671126711166233166858001080020160020267113911800211091080010100000000050205226626704160000800102671226712267122671226712
800242671120000618000021280251600101600108001016314249236312671126711166233166858001080020160020267113911800211091080010100000002050208228826704160000800102671226712267122671226712
800242671120000618000021280251600101600108001016314249236312671126711166233166858001080020160020267113911800211091080010100000000050206225626704160000800102671226712267122671226712
800242671120000618000021280251600101600108001016314249236312671126711166233166858001080020160020267113911800211091080010100000000050205227726704160000800102671226712267122671226712
80024267112000366180000212802516001016001080010163142492363126711267111662331668580010800201600202671139118002110910800101000000300502062271026704160000800102671226712267122671226712
8002426711200001038000021280251600101600108001016314249236312671126711166233166858001080020160020267113911800211091080010100002000050207226726749160000800102671226712267122671226829
800242671120111259480000212807416038516001080010163142492363126711267111662310166858001080020160020267113911800211091080010100000030050207226626704160000800102671226712267122671226712