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

SUB (sxtw, 64-bit)

Test 1: uops

Code:

  sub 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)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)l1d cache writeback (a8)accfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? int retires (ef)f5f6f7f8fd
10042035160611000173525200020001000325701203520351575318421000100020002035421110011000000731671117812000100020362036203620362036
10042035150611000173525200020001000325700203520351575318421000100020002035421110011000000731671117812000100020362036203620362036
10042035160611000173525200020001000325700203520351575318421000100020002035421110011000000731671117812000100020362036203620362036
100420351696110001735252000200010003257012035203515753184210001000200020354211100110000012731671117812000100020362036203620362036
100420351524611000173525200020001000325701203520351575318421000100020002035421110011000000731671117812000100020362036203620362036
10042035150611000173544200020001000325700203520351575318421000100020002035421110011000000731671117812000100020362036203620362036
10042035156611000173525200020001000325701203520351575318421000100020002035421110011000000731671117812000100020362036203620362036
10042035160611000173525200020001000325701203520351575318421000100020002035421110011000000731671117812000100020362036203620362036
100420351512611000173525200020001000325701203520351575318421000100020002035421110011000000731671117812000100020362036203620362036
10042035150611000173525200020001000325701203520351575318421000100020002035421110011000080731671117812000100020362036203620362036

Test 2: Latency 1->2

Code:

  sub 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 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
1020420035150110611000019803252010020100101111849851491695520035200351847771873610111102322026420035421110201100991001010010000111720116111984820000101002003620036200362003620036
10204200351501106110000198032520100201001011118498514916955200352003518477718735101111023220264200354211102011009910010100100057111720116111984820000101002003620036200362003620036
1020420035150110611000019803252010020100101001853420491695520035200351842931870010100102002020020035421110201100991001010010000000710259221979120000101002003620036200362003620036
1020420035150000611000019803252010020100101001853420491695520035200351842931870010100102002020020035421110201100991001010010000000710259221979120000101002003620036200362003620036
10204200351510006110000198032520100201001010018534204916955200352003518429318700101001020020200200354211102011009910010100100051000710259221979120000101002003620036200362003620036
1020420035150000611000019803252010020100101001853420491695520035200351842931870010100102002020020035421110201100991001010010000000710259221979120000101002021720036200362003620036
10204200351500007261000019803252010020100101001853421491695520035200351842931870010100102002020020035421110201100991001010010000000710259221979120000101002003620036200362003620036
1020420035150000611000019803252010020100101001853420491695520035200351842931870010100102002020020035421110201100991001010010000000710259221979120000101002003620036200362003620036
10204200351500006110000198032520100201001010018534204916955200352003518429318700101001020020200200354211102011009910010100100051000710259221979120000101002003620036200362003620036
1020420035150000611000019803252010020100101001853420491695520035200351842931870010100102002020020035421110201100991001010010000000710259221989620000101002003620036200362003620036

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)18191e1f3a3f4c4d51schedule 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)a9acc2cfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? int retires (ef)f5f6f7f8fd
1002420035150000000061100001974325200102001010010185310149169552003520035184513187181001010020200202003542111002110910100101000000000640263221979220000100102003620036200362003620036
1002420035150000090061100001974325200102001010010185310149169552003520035184513187181001010020200202003542111002110910100101000001430640263221979220000100102003620036200362003620036
1002420035150010000061100001974325200102001010010185310149169552003520035184513187181001010020200202003542111002110910100101000000000640263221979220000100102003620036200362003620036
10024200351500000210061100001974325200102001010010185310149169552003520035184513187181001010020200202003542111002110910100101000000000640263221979220000100102003620036200362003620036
1002420035150000000061100001974325200102001010010185310149169552003520035184513187181001010020200202003542111002110910100101000012000640263221979220000100102003620036200362003620036
1002420035150000000061100001974325200102001010010185310149169552003520035184513187181001010020200202003542111002110910100101000000000640263221979220000100102003620036200362003620036
10024200351490000000611000019743252001020010100101853101491695520035200351845131871810010100202002020035421110021109101001010000036000640263221979220000100102003620036200362003620036
10024200351500000000441100001974325200102001010010185310149169552003520035184513187181001010020200202003542111002110910100101000000000640263221979220000100102003620036200362003620036
1002420035150000000061100001974325200102001010010185310149169552003520035184513187181001010020200202003542111002110910100101000000000640263421979220000100102003620036200362003620036
10024200351500000000611000019743252001020010100101853101491695520035200351845111187181001010020200202003542111002110910100101000000000640263221979220000100102003620036200362003620036

Test 3: Latency 1->3

Code:

  sub 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)03mmu table walk data (08)l2 tlb miss data (0b)18191e1f3a3f4c4d51schedule 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)a9acc2cfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? int retires (ef)f5f6f7f8fd
102042003515000000007281000019803252010020100101001853421491695520035200351842931870010100102002020020035421110201100991001010010000000000710159111979120000101002003620036200362003620036
102042003515000000001451000019803252010020100101001853420491695520035200351842931870010100102002020020035421110201100991001010010000000000710159111979120000101002003620036200362003620036
1020420035150000000011941000019803252010020100101001853421491695520035200351842931870010100102002020020035421110201100991001010010000000000710159111979120000101002003620036200812003620036
10204200351500000000611000019803252010020100101001853420491695520035200351842931870010100102002020020035421110201100991001010010000200002710175111979120000101002008220082200362003620036
10204200351500000000611000019803252010020100101001853421491695520035200351842931870010100102002020020035421110201100991001010010000010000710159111979120000101002003620036200362003620036
10204200351500000000611000019803252010020100101001853420491695520035200351842931870010100102002020020035421110201100991001010010000000000710159111979120000101002003620036200362003620036
102042003515000000001031000019803252010020100101001853421491695520035200351842931870010100102002020020035421110201100991001010010000000000710159111979120000101002003620036200362003620036
102042003515000000001031000019803252010020100101001853421491695520035200351842931870010100102002020020035421110201100991001010010000000002710159111979120000101002003620036200362008220036
1020420035149001127600611000019803462010020100101001853420491695520035200351842931870010100102002020020035421110201100991001010010000000000710159111979120000101002003620036200362003620036
10204200351500000000611000019803252010020100101001853421491695520035200351842931870010100102002020020035421110201100991001010010000001000710159111979120000101002003620036200362003620036

1000 unrolls and 10 iterations

Result (median cycles for code): 2.0035

retire uop (01)cycle (02)03mmu table walk data (08)09l2 tlb miss data (0b)1e1f3f4c4d51schedule 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)a9accfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? int retires (ef)f5f6f7f8fd
10024200351500000021210000197432520010200101001018531004916955200352003518451318718100101002020020200354211100211091010010100000640263221979220000100102003620036200362003620036
10024200351500000023610000197432520010200101001018531014916955200352003518451318718100101002020020200354211100211091010010100000640263221979220000100102003620036200362003620036
10024200351500000049110000197432520010200101001018531014916955200352003518451318718100101002020020200354211100211091010010100000640263221979220000100102003620036200362003620036
10024200351500000023710000197432520010200101001018531004916955200352003518451318718100101002020020200354211100211091010010100000640263221979220000100102003620036200362003620036
1002420035150000006110000197432520010200101001018531004916955200352003518451318718100101002020020200354211100211091010010100000640263221979220000100102003620036200362003620036
1002420035150000008210000197432520010200101001018531004916955200352003518451318718100101002020020200354211100211091010010100000640263221979220000100102003620036200362003620036
100242003515000000129510000197432520010200101001018531004916955200352003518451318718100101002020020200354211100211091010010100000640263221979220000100102003620036200362003620036
1002420035150000001434100001974325200102001010010185310049169552003520035184513187181001010020200202003542111002110910100101003503640263221979220000100102003620036200362003620036
10024200351500000024810000197432520010200101001018531004916955200352003518451318718100101002020020200354211100211091010010100000640263221979220000100102003620036200362003620036
100242003515000000113610000197432520010200101001018531004916955200352003518451318718100101002020020200354211100211091010010100000640263221979220000100102003620036200362003620036

Test 4: throughput

Count: 8

Code:

  sub x0, x8, w9, sxtw
  sub x1, x8, w9, sxtw
  sub x2, x8, w9, sxtw
  sub x3, x8, w9, sxtw
  sub x4, x8, w9, sxtw
  sub x5, x8, w9, sxtw
  sub x6, x8, w9, sxtw
  sub 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)03mmu table walk data (08)1e3f4c4d51schedule uop (52)schedule int uop (53)dispatch int uop (56)int uops in schedulers (59)60696a6d6emap 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 cache writeback (a8)accfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? int retires (ef)f5f6f7f8fd
8020426772200001378000026094251601001601008010016431804923645267252672516615031667780100802001602002672539118020110099100801001000051102221126717160000801002672626726267262672626726
802042672520000618000026094251601001601008010016431804923645267252672516615031667780100802001602002672539118020110099100801001001051101222126717160000801002672626726267262672626726
8020426725200006180163245424816010116028780312164318049236452678526844166140111667780100802001602002672539118020110099100801001000051101311126717160000801002672626726267262672626726
8020426725200001038000026094251601001601008010016431804923645267252672516615031667780100802001602002672539118020110099100801001000051101221126717160000801002672626726267262672626726
802042672520000618000026094251601001601008031016431804923645267252672516615031667780100802001602002672539118020110099100801001000051101221126717160000801002672626726267262672626726
8020426725200004418000026094251601001601008010016431804923645267252672516615031667780100802001602002672539118020110099100801001000051101221126717160000801002672626726267262672626726
80204267252000010988000026094251601001601008010016431814923645267252672516615031667780100802001602002672539118020110099100801001000051101221126717160000801002672626726267262672626726
802042672520000618000026094251601001601008010016431804923645267252672516615031667780100802001602002672539118020110099100801001000051101221126717160000801002672626726267262672626726
802042672520000618000026094251601001601008010016431804923645267252672516615031667780100802001602002672539118020110099100801001000051101221126891160000801002672626726267262672626726
802042672520000618000026094251601001601008010016431804923645267252672516615031667780100802001602002672539118020110099100801001000051101220126717160000801002672626726267262672626726

1000 unrolls and 10 iterations

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

retire uop (01)cycle (02)031e3f4c4d51schedule uop (52)schedule int uop (53)dispatch int uop (56)int uops in schedulers (59)5f6061696a6d6emap 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)acc2branch mispred nonspec (cb)cfd0d2l1i cache miss demand (d3)d5map dispatch bubble (d6)d9daddfetch restart (de)e0? int output thing (e9)eaeb? int retires (ef)f5f6f7f8fd
800242671720006180000212802516001016001080010163142110492363126711267111662331668580010800201600202671139118002110910800101000000502000072200352670416000000800102671226712267122671226712
800242671120008280000212802516001016001080010163142010492363126711267111662331668580010800201600202671139118002110910800101000000502000032200352670416000000800102671226712267122671226712
8002426711200014580000212802516001016001080010163142010492363126711267111662331668580010800201600202671139118002110910800101000000502000032200352670416000000800102671226712267122671226712
8002426711200014580000212802516001016001080010163142010492363126711267111662331668580010800201600202671139118002110910800101000000502000052200532670416000000800102671226712267122671226712
8002426711200014580000212802516001016001080010163142010492363126711267111662331668580010800201600202671139118002110910800101000000502000052200532670416000000800102671226712267122671226712
8002426711200050380000212802516001016001080010163142010492363126711267111662331668580010800201600202671139118002110910800101000000502000032200352670416000000800102671226712267122671226712
80024267112000126800002128025160010160010800101631420104923631267112671116623316685800108002016002026711391180021109108001010001200502000032200552670416000000800102671226712267122671226712
8002426711200012480000212802516001016001080010163142010492363126711267111662331668580010800201600202671139118002110910800101000000502000052200552670416000000800102671226712267122671226712
8002426711200014580000212802516001016001080364163142010492363126711267111662331668580010800201600202671139118002110910800101000000502201032200352670416000000800102671226712267122671226712
80024267112000166800002128025160010160010800101631420104923631267112671116623316685800108002016002026711391180021109108001010000005020000522005526704160000013800102671226712267122671226712