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 (register, lsr, 32-bit)

Test 1: uops

Code:

  add w0, w0, w1, lsr #17
  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 cache writeback (a8)accfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? int retires (ef)f5f6f7f8fd
1004203515061100017352520002000100032570120352035157531842100010002000203542111001100000731671117812000100020362036203620362036
1004203515061100017352520002000100032570120352035157531842100010002000203542111001100000731671117812000100020362036203620362036
1004203515061100017352520002000100032570120352035157531842100010002000203542111001100000731671117812000100020362036203620362036
1004203515061100017352520002000100032570120352035157531842100010002000203542111001100000731671117812000100020362036203620362036
1004203515061100017352520002000100032570120352035157531842100010002000203542111001100000731671117812000100020362036203620362036
10042035150131100017352520002000100032570120352035157531842100010002000203542111001100000731671117812000100020362036203620362036
1004203515061100017352520002000100032570120352035157531842100010002000203542111001100000731671117812000100020362036203620362036
1004203516061100017352520002000100032570120352035157531842100010002000203542111001100000731671117812000100020362036203620362036
100420351512661100017352520002000100032570120352035157531842100010002000203542111001100000731671117812000100020362036203620362036
1004203515361100017352520002000100032570120352035157531842100010002000203542111001100000731671117812000100020362036203620362036

Test 2: Latency 1->2

Code:

  add w0, w0, w1, lsr #17
  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)9faccfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? int retires (ef)f5f6f7f8fd
102042003515047761100001980325201002010010100185342049169552003520081184293187001010010200202002003542111020110099100101001003710259221979120000101002003620036200362003620036
1020420035150061100001980325201002010010100185342049169552003520035184293187001010010200202002003542111020110099100101001000710259221979120000101002003620036200362003620036
1020420035150061100001980325201002010010100185342049169552003520035184293187001010010200202002003542111020110099100101001000710259221979120000101002003620036200362003620036
1020420035150361100001980325201002010010100185342049169552003520035184293187001010010200202002003542111020110099100101001000710259221979120000101002003620036200362003620036
10204200351502761100001980325201002010010100185342049169552003520035184293187001010010200202002003542111020110099100101001000710259221979120000101002003620036200362003620081
10204200351498161100001980325201002010010100185342049169552003520035184293187001010010200202002003542111020110099100101001000710259221979120000101002003620036200362003620036
1020420035150361100001980325201002010010100185342049169552003520035184293187001010010200202002003542111020110099100101001000710259221979120000101002003620036200362003620036
1020420035150061100001980325201002010010100185342049169552003520035184293187001010010200202002003542111020110099100101001000710259221979120000101002003620036200362003620036
1020420035150061100001980325201002010010100185342049169552003520035184293187001010010200202002003542111020110099100101001000710259221979120000101002003620036200362003620036
1020420035150061100001980325201002010010100185342049169552003520035184293187001010010200202002003542111020110099100101001000710259221979120000101002003620036200362003620036

1000 unrolls and 10 iterations

Result (median cycles for code): 2.0035

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)9faccfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? int retires (ef)f5f6f7f8fd
1002420035150096110000197432520010200101001018531014916955200352003518451318718100101002020020200354211100211091010010100640263221979220000100102003620036200362003620036
1002420035150106110000197432520010200101001018531014916955200352003518451318718100101002020020200354211100211091010010100640263221979220000100102003620036200362003620036
1002420035150006110000197432520010200101001018531014916955200352003518451318718100101002020020200354211100211091010010100640263221979220000100102003620036200362003620036
1002420035150006110000197432520010200101001018531014916955200352003518451318718100101002020020200354211100211091010010100640263221979220000100102003620036200362003620036
1002420035150006110000197432520010200101001018531014916955200352003518451318718100101002020020200354211100211091010010100640263221979220000100102003620036200362003620036
100242003515003276110000197432520010200101001018531014916955200352003518451318718100101002020020200354211100211091010010100640263221979220000100102003620036200362003620036
1002420035149006110000197432520010200101001018531014916955200352003518451318718100101002020020200354211100211091010010100640263221979220000100102003620036200362003620036
1002420035150006110000197432520010200101001018531014916955200352003518451318718100101002020020200354211100211091010010100640263221986020000100102003620036200362003620036
1002420035150006110000197432520010200101001018531014916955200352003518451318718100101002020020200354211100211091010010100640263221979220000100102003620036200362003620036
1002420035149045072610000197432520010200101001018531014916955200352003518451318718100101002020020200354211100211091010010100640263221979220000100102003620036200362003620036

Test 3: Latency 1->3

Code:

  add w0, w1, w0, lsr #17
  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)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 miss (a1)accfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? int retires (ef)f5f6f7f8fd
10204200351503661100001980325201002010010100185342491695520035200351842931870010100102002020020035421110201100991001010010000710159111979120000101002003620036200362003620036
1020420035150061100001980325201002010010100185342491695520035200351842931870010100102002020020035421110201100991001010010000710159111979120000101002003620036200362003620036
1020420035150061100001980325201002010010100185342491695520035200351842931870010100102002020020035421110201100991001010010000710159111979120000101002003620036200362003620036
1020420035150061100001980325201002010010100185342491695520035200351842931870010100102002020020035421110201100991001010010000710159111979120000101002003620036200362003620036
1020420035150061100001980325201002010010100185342491695520035200351842931870010100102002020020035421110201100991001010010000710159111979120000101002003620036200362003620036
1020420035150174105100001980325201002010010100185342491695520035200351842931870010100102002020020035421110201100991001010010000710159111979120000101002003620036200362003620036
1020420035150061100001980325201002010010100185342491695520035200351842931871110100102002020020035421110201100991001010010000710159111979120000101002003620036200362003620036
1020420035150061100001980325201002010010100185342491695520035200351842931870010100102002020020035421110201100991001010010000710159111979120000101002003620036200362003620036
1020420035150061100001980325201002010010100185342491695520035200351842931870010100102002020020035421110201100991001010010000710159111979120000101002003620036200362003620036
10204200351503661100001980325201002010010100185342491695520035200351842931870010100102002020020035421110201100991001010010000710159111979120000101002003620036200362003620036

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)0e18191e1f3a3f4c4d51schedule 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
100242003515000020033006110000197432520010200101001018531004916955200352003518451318718100101002020020200354211100211091010010100000000640363331979220000100102003620036200362003620036
10024200351500000003006110000197432520010200101001018531004916955200352003518451318718100101002020020200354211100211091010010100000000640363331979220000100102003620036200362003620036
10024200351500000000006110000197432520010200101001018531004916955200352003518451318718100101002020020200354221100211091010010100000000640363331979220000100102003620036200362003620036
10024200351500000000006110000197432520010200101001018531004916955200352003518451318718100101002020020200354211100211091010010100000000640363331979220000100102003620036200362003620036
10024200351500000000006110000197432520010200101001018531014916955200352003518451318718100101002020020200354211100211091010010100003000640363331979220000100102003620036200362003620036
10024200351500000000006110000197432520010200101001018531014916955200352003518451318718100101002020020200354211100211091010010100000000640363331979220000100102003620036200362003620036
100242003515000000024006110000197432520010200101001018531014916955200352003518451318718100101002020020200354211100211091010010100000000640363331979220000100102003620036200362003620036
10024200351500000000006110000197432520010200101001018531004916955200352003518451318718100101002020020200354211100211091010010100000000640363331979220000100102003620036200362003620036
10024200351500000000006110000197432520010200101001018531004916955200352003518451318718100101002020020200354211100211091010010100000000640363331979220000100102003620036200362003620036
10024200351500000000006110000197432520010200101001018531014916955200352003518451318718100101002020020200354211100211091010010100000000640363331979220000100102003620036200362003620036

Test 4: throughput

Count: 8

Code:

  add w0, w8, w9, lsr #17
  add w1, w8, w9, lsr #17
  add w2, w8, w9, lsr #17
  add w3, w8, w9, lsr #17
  add w4, w8, w9, lsr #17
  add w5, w8, w9, lsr #17
  add w6, w8, w9, lsr #17
  add w7, w8, w9, lsr #17
  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)03l2 tlb miss data (0b)18191e3f4c4d51schedule 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)acbranch cond mispred nonspec (c5)cfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? int retires (ef)f5f6f7f8fd
802042677120000006180000260942516010016010080100164318492364526725267251661531667780100802001602002672539118020110099100801001000000051102221126717160000801002672626726267262672626726
802042672520000006180000260942516010016010080100164318492364526725267251661531667780100802001602002672539118020110099100801001000000051101221126717160000801002672626726267262672626726
802042672520000006180000260942516010016010080100164318492364526725267251661531667780100802001602002672539118020110099100801001000000051101221126717160000801002672626726267262672626726
802042672520000006180000260942516010016010080100164318492364526725267251661531667780100802001602002672539118020110099100801001000000051341221126717160000801002672626726267262672626726
8020426725200000094380000260942516010016010080100164318492364526725267251661531667780100802001602002672539118020110099100801001000000051101221126717160000801002672626726267262672626726
802042672520000006180000260942516010016010080100164318492364526725267251661531667780100802001602002672539118020110099100801001000000051101221126717160000801002672626726267262672626726
802042672520000006180000260942516010016010080100164318492364526725267251661531667780100802001602002672539118020110099100801001000000051101221126717160000801002672626726267262672626726
802042672520000006180000260942516010016010080100164318492364526725267251661531667780100802001602002672539118020110099100801001000000051101221126717160000801002672626726267262672626726
802042672520000006180000260942516010016010080100164318492364526725267251661531667780100802001602002672539118020110099100801001000000051101221126717160000801002672626726267262672626726
802042672520000006180000260942516010016010080100164318492364526725267251661531667780100802001602002672539118020110099100801001000000051101221126717160000801002672626726267262672626726

1000 unrolls and 10 iterations

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

retire uop (01)cycle (02)033f4c4d51schedule 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)accfd0d5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? int retires (ef)f5f6f7f8fd
800242673420061800002128025160010160010800101631421492363126711267111662331668580010800201600202671139118002110910800101000502005228526704160000800102671226712267122671226712
800242671120061800002128025160010160010800101631421492363126711267111662331668580010800201600202671139118002110910800101000502002223626704160000800102671226712267122671226712
800242671120061800002128025160010160010800101631421492363126711267111662331668580010800201600202671139118002110910800101000502002223626704160000800102671226712267122671226712
800242671120061800002128025160010160010800101631421492363126711267111662331668580010800201600202671139118002110910800101000502005225526704160000800102671226712267122671226712
800242671120061800002128025160010160010800101631421492363126711267111662331668580010800201600202671139118002110910800101000502003223426704160000800102671226712267122671226712
800242671120061800002128025160010160010800101631421492363126711267111662331668580010800201600202671139118002110910800101000502003222326704160000800102671226712267122671226712
800242671120061800002128025160010160010800101631421492363126711267111662331668580010800201600202671139118002110910800101000502005223226704160000800102671226712267122671226712
800242671120061800002128025160010160010800101631420492363126711267111662331668580010800201600202671139118002110910800101000502003223226704160000800102671226712267122671226712
800242671120061800002128025160010160010800101631420492363126711267111662331668580010800201600202671139118002110910800101000502003223226704160000800102671226712267122671226712
800242671120061800002128025160010160010800101631420492363126711267111662331668580010800201600202671139118002110910800101000502005223326704160000800102671226712267122671226712