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 (uxth, 64-bit)

Test 1: uops

Code:

  add x0, x0, w1, uxth
  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)l1d tlb access (a0)l1d tlb miss (a1)accfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? int retires (ef)f5f6f7f8fd
10042035150611000173525200020001000325700203520351575318421000100020002035421110011000000731671117812000100020362036203620362036
10042035150611000173525200020001000325701203520351575318421000100020002035421110011000006731671117812000100020362036208220362036
10042035150611000173525200020001000325700203520351575318421000100020002035421110011000006731671117812000100020362036203620362036
10042035150611000173525200020001000325700208020351575318421000100020002035421110011000000731671117812000100020362036203620362036
10042035160611000173525200020001000325701203520351575318421000100020002035421110011000000731671117812000100020362036203620362036
10042035160611000173525200020001000325700203520351575318421000100020002035421110011000000731671117812000100020362036203620362036
1004203515061100017352520002000100032570020352035157531842100010002000203542111001100002141731671117812000100020362036203620362036
10042035150611000173525200020001000325701203520351575318421000100020002035421110011000000731671117812000100020362036203620362036
10042035150611000173525200020001000325701203520351575318421000100020002035421110011000000731671117812000100020362036203620362036
10042035150611000173525200020001000325700203520351575318421000100020002035421110011000000731671117812000100020362036203620362036

Test 2: Latency 1->2

Code:

  add x0, x0, w1, uxth
  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 tlb miss (a1)ld unit uop (a6)l1d cache writeback (a8)accfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? int retires (ef)f5f6f7f8fd
1020420035150061100001980325201002010010100185342049169552003520035184293187001010010200202002003542111020110099100101001000000710159111979120000101002003620036200362003620036
1020420035150061100001980325201002010010100185342049169552003520035184293187001010010200202002003542111020110099100101001000000710159111979120000101002003620036200362003620036
1020420035150061100001980325201002010010100185342049169552003520035184293187001010010200202002003542111020110099100101001000000710159111979120000101002003620036200362003620036
1020420035150061100001980325201002010010100185342049169552003520035184293187001010010200202002003542111020110099100101001000000710159111979120000101002003620036200362003620036
1020420035150061100001980325201002010010100185342149169552003520035184293187001010010200202002003542111020110099100101001000000710159111979120000101002003620036200362003620036
1020420035150061100001980325201002010010100185342049169552003520035184293187001010010200202002003542111020110099100101001000000710159111979120000101002003620036200362003620036
1020420035150061100001980325201002010010100185342149169552003520035184293187001010010200202002003542111020110099100101001000000710159111979120000101002003620036200362003620036
1020420035150061100001980325201002010010100185342049169552003520035184293187001010010200202002003542111020110099100101001000000710159111979120000101002003620036200362003620036
1020420035150061100001980325201002010010100185342049169552003520035184293187001010010200202002003542111020110099100101001000000710159111979120000101002003620036200362003620036
1020420035150061100001980325201002010010100185342049169552003520035184293187001010010200202002003542111020110099100101001000010735159111979120000101002003620036200362003620036

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 instruction (0a)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)l1d cache writeback (a8)acc2cfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? int retires (ef)f5f6f7f8fd
10024200351500000000611000019743252001020010100101853100491695520035200351845131871810010100202002020035421110021109101001010000100640363341979220000100102003620036200362003620036
10024200351500000000611000019743252001020010100101853100491695520035200351845131871810010100202002020035421110021109101001010000000640363431979220000100102003620036200362003620036
10024200351500000000611000019743252001020010100101853100491695520035200351845131871810010100202002020035421110021109101001010000000640463441979220000100102003620036200362003620036
10024200351490000000611000019743252001020010100101853100491695520035200351845131871810010100202002020035421110021109101001010000000640363441979220000100102003620036200362003620036
1002420035150000000011191000019743252001020010100101853101491695520035200351845131871810010100202002020035421110021109101001010000000640363441979220000100102003620036200362003620036
10024200351500000000611000019743252001020010100101853100491695520035200351845131871810010100202002020035421110021109101001010002100640363331979220000100102003620036200362003620036
100242003515000000240611000019743252001020010100101853101491695520035200351845131871810010100202002020035421110021109101001010000000640263341979220000100102003620036200362003620036
10024200351500000000611000019743252001020010100101853100491695520035200351845131871810010100202002020035421110021109101001010000000640363341979220000100102003620036200362003620036
10024200351500000000611000019743252001020010100101853100491695520035200351845131871810010100202002020035421110021109101001010000000670363331979220000100102003620036200362003620036
10024200351500000000611000019743252001020010100101853101491695520035200351845131871810010100202002020035421110021109101001010000100640463341979220000100102003620036200362003620036

Test 3: Latency 1->3

Code:

  add x0, x1, w0, uxth
  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)l2 tlb miss data (0b)191e3f4c4d51schedule 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)ld unit uop (a6)l1d cache writeback (a8)a9accfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? int retires (ef)f5f6f7f8fd
10204200351500000611000019803252010020100101001853421491695520035200351842931870010100102002020020035421110201100991001010010000100710159111979120000101002003620036200362003620036
10204200351500000611000019803252010020100101001853421491695520035200351842931870010100102002020020035421110201100991001010010000000710159111979120000101002003620036200362003620036
10204200351500000611000019803252010020100101001853421491695520035200351842931870010100102002020020035421110201100991001010010000106710159111979120000101002003620036200362003620036
10204200351500000611000019803252010020100101001853421491695520035200351842931870010100102002020020035421110201100991001010010000000710159111979120000101002003620036200362003620036
10204200351500000611000019803252010020100101001853421491695520035200351842931870010100102002020020035421110201100991001010010000000710159111979120000101002003620036200362003620036
10204200351500000611000019803252010020100101001853421491695520035200351842931870010100102002020020035421110201100991001010010000000710159111979120000101002003620036200362003620036
102042003515000006110000198032520100201001010018534214916955200352003518429318700101001020020200200354211102011009910010100100001012710159111979120000101002003620036200362003620036
10204200351500000611000019803252010020100101001853421491695520035200351842931870010100102002020020035421110201100991001010010000000710159111979120000101002003620036200362003620036
10204200351500000611000019803252010020100101001853421491695520035200351842931870010100102002020020035421110201100991001010010000000710159111979120000101002003620036200362003620036
10204200351500000611000019803252010020100101001853421491695520035200351842931870010100102002020020035421110201100991001010010000006710159111979120000101002003620036200362003620036

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)l1d cache writeback (a8)a9acc2cfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? int retires (ef)f5f6f7f8fd
10024200351490000006110000197432520010200101001018531014916955200352003518451318718100101002020020200354211100211091010010100000000640263221979220000100102003620036200362003620036
100242003515000000017310000197432520010200101001018531014916955200352003518451318718100101002020020200354211100211091010010100000000640263221979220000100102003620036200362003620036
10024200351500000006110000197432520010200101001018531014916955200352003518451318718100101002020020200354211100211091010010100000030640263221979220000100102003620036200362003620036
10024200351490000006110000197432520010200101044818531014916955200352003518451318718100101002020020200354211100211091010010100002000640263221979220000100102003620036200362003620036
10024200351500000006110000197432520010200101001018531014916955200352003518451318718100101002020020200354211100211091010010100000000640263221979220000100102003620036200362003620036
10024200351500000006110000197432520010200101001018531014916955200352003518451318718101551002020020200354211100211091010010100000000640263221979220000100102003620036200362003620036
10024200351500000006110000197432520010200101001018531014916955200352003518451318718100101002020020200354211100211091010010100000000640263221979220000100102003620036200362003620036
10024200351500000006110000197432520010200101001018531014916955200352003518451318718100101002020020200354211100211091010010100000000640263221979220000100102003620036200362003620036
10024200351500000006110000197432520010200101001018531014916955200352003518451318718100101002020020200354211100211091010010100001000640263221979220000100102003620036200362003620036
10024200351500000006110000197432520010200771001018531014916955200352003518451318718100101002020020200354211100211091010010100001020080640263221979220000100102003620036200362003620036

Test 4: throughput

Count: 8

Code:

  add x0, x8, w9, uxth
  add x1, x8, w9, uxth
  add x2, x8, w9, uxth
  add x3, x8, w9, uxth
  add x4, x8, w9, uxth
  add x5, x8, w9, uxth
  add x6, x8, w9, uxth
  add x7, x8, w9, uxth
  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)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 access (a0)l1d tlb miss (a1)l1d cache writeback (a8)a9accdcfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? int retires (ef)f5f6f7f8fd
802042676720100618000026094251601001601008010016431814923645267252672516615316677801008020016020026725391180201100991008010010000000051102221126717160000801002672626726267262672626726
802042672520000618000026094251601001601008010016431814923645267252672516615316677801008020016020026725391180201100991008010010000000051101221126717160000801002672626726267262672626726
802042672520000618000026094251601001601008010016431814923645267252672516615316677801008020016020026725391180201100991008010010000000051101221126717160000801002672626726267262672626726
802042672520000618000026094251601001601008010016431814923645267252672516615316677801008020016020026725391180201100991008010010000300051101221126717160000801002672626726267262672626726
802042672520000618000026094251601001601008010016431804923645267252672516615316677801008020016020026725391180201100991008010010000000051101221126717160000801002672626726267262672626726
802042672520000618000026094251601001601008010016431814923645267252672516615316677801008020016020026725391180201100991008010010000000051101221126717160000801002672626726267262672626726
802042672520100618000026094251601001601008010016431804923645267252672516615316677801008020016020026725391180201100991008010010000000051101221126717160000801002672626726267262672626726
802042672520000618000026094251601001601008010016431804923645267252672516615316677801008020016020026725391180201100991008010010000000051101221126717160000801002672626726267262672626726
802042672520000618000026094251601001601008010016431814923645267252672516615316677801008020016020026725391180201100991008010010000000051101221126717160000801002672626726267262672626726
802042672520000618000026094251601001601008010016431814923645267252672516615316677801008020016020026725391180201100991008010010000000051101221126717160000801002672626726267262672626726

1000 unrolls and 10 iterations

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

retire uop (01)cycle (02)03191e3f4c4d51schedule uop (52)schedule int uop (53)dispatch int uop (56)int uops in schedulers (59)5f60696a6d6emap 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)acbranch cond mispred nonspec (c5)cfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)ea? int retires (ef)f5f6f7f8fd
80024267512000061800002128025160010160010800101631420049236312671126711166233166858001080020160020267113911800211091080010100001300502052223267041600000800102671226712267122671226712
80024267112000017480000212802516001016001080010163142004923631267112671116623316685800108002016002026711391180021109108001010000000502032253267041600000800102671226712267122671226712
8002426711200006180000212802516001016001080010163142004923631267112671116623316685800108002016002026711391180021109108001010000000502072233267041600000800102671226712267122671226712
8002426711200006180000212802516001016001080010163142014923631267112671116623316685800108002016002026711391180021109108001010000000502062225267041600000800102671226712267122671226712
8002426711200006180000212802516001016001080010163142014923631267112671116623316685800108002016002026711391180021109108001010000000502032232267041600000800102671226712267122671226712
8002426711200106180000212802516001016001080010163142014923631267112671116623316685800108002016002026711391180021109108001010000001502032246267041600000800102671226712267122671226712
8002426711200006180000212802516001016001080010163142004923631267112671116623316685800108002016002026711391180021109108001010000000502062265267041600000800102671226712267122671226712
8002426711200006180000212802516001016001080010163142004923631267112671116623316685800108002016002026711391180021109108001010000000502052233267041600000800102671226712267122671226712
8002426711200006180000212802516001016001080010163142014923631267112671116623316685800108002016002026711391180021109108001010000000502062265267041600000800102671226712267122671226712
8002426711200006180000212802516001016001080010163142014923631267112671116623316685800108002016002026711391180021109108001010000000502032253267041600000800102671226712267122671226712