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, 64-bit)

Test 1: uops

Code:

  add x0, x0, x1, 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)ld unit uop (a6)accfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? int retires (ef)f5f6f7f8fd
1004205815061100017352520002000100032570020352035157531842100010002000203542111001100000731671117812000100020362036203620362036
1004203515061100017352520002000100032570120352035157531842100010002000203542111001100000731671117812000100020362036203620362036
1004203515061100017352520002000100032570120352035157531842100010002000203542111001100000731671117812000100020362036203620362036
1004203515061100017352520002000100032570120352035157531842100010002000203542111001100000731671117812000100020362036203620362036
1004203515061100017352520002000100032570120352035157531842100010002000203542111001100000731671117812000100020362036203620362036
1004203516061100017352520002000100032570120352035157531842100010002000203542111001100000731671117812000100020362036203620362036
1004203515961100017352520002000100032570020352035157531842100010002000203542111001100009731671117812000100020362036203620362036
10042035151861100017352520002000100032570120352035157531842100010002000203542111001100000731671117812000100020362036203620362036
1004203515061100017352520002000100032570120352035157531842100010002000203542111001100000731671117812000100020362036203620362036
1004203515061100017352520002000100032570020352035157531842100010002000203542111001100000731671117812000100020362036203620362036

Test 2: Latency 1->2

Code:

  add x0, x0, x1, 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)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)9fld 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
102042003515000216110000198032520100201001010018534214916955200352003518429318700101001020020200200354211102011009910010100100000000710159111979120000101002003620036200362003620036
102042003515000456110000198032520100201001010018534214916955200352003518429318700101001020020200200354211102011009910010100100000000710159111979120000101002003620036200362003620036
10204200351500006110000198032520100201001010018534204916955200352003518429318700101001020020200200354211102011009910010100100000000710159111979120000101002003620036200362003620036
10204200351500006110000198032520100201001010018534214916955200352003518429318700101001020020200200354211102011009910010100100000000710159111979120000101002003620036200362003620036
10204200351500006110000198032520100201001010018534214916955200352003518429318700101001020020200200354211102011009910010100100000000710159111979120000101002003620036200362003620036
10204200351500006110000198032520100201001010018534204916955200352003518433318700101001020020200200354211102011009910010100100000000710159111979120000101002003620036200362003620036
10204200351500006110000198032520100201001010018534214916955200352003518429318700101001020020200200354211102011009910010100100000000710159111979120000101002003620036200362003620036
102042003515000156110000198032520100201001010018534214916955200352003518429318700101001020020200200354211102011009910010100100000000710159111979120000101002003620036200362003620036
10204200351500006110000198032520100201001010018534214916955200352003518429318700101001020020200200354211102011009910010100100000000710159111979120000101002003620036200362003620036
10204200351500006110000198032520100201001010018534204916955200352003518429318700101001020020200200354211102011009910010100100000000710159111979120000101002003620036200362003620036

1000 unrolls and 10 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 cache writeback (a8)a9acbranch mispred nonspec (cb)cfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? int retires (ef)f5f6f7f8fd
10024200351500611000019743252001020010100101853104916955200352003518451318718100101002020020200354211100211091010010100000640263221979220000100102003620036200362003620036
10024200351500611000019743252001020010100101853104916955200352003518451318718100101002020020200354211100211091010010100000640263231979220000100102003620036200362003620036
1002420035150186611000019743252001020010100101853104916955200352003518451318718100101002020020200354211100211091010010100000640263221979220000100102003620036200362003620036
10024200351500611000019743252001020010100101853104916955200352003518451318718100101002020020200354211100211091010010100000640263221979220000100102003620036200362003620036
1002420035150123611000019743252001020010100101853104916955200352003518451318718100101002020020200354211100211091010010100000640263221979220000100102003620036200362003620036
100242003515001241000019743252001020010100101853104916955200352003518451318718100101002020020200359611100211091010010100000640263221979220000100102003620036200362003620036
10024200351502104411000019743252001020010100101853104916955200352003518451318718100101002020020200354211100211091010010100001640263221979220000100102003620036200362003620036
1002420035150168611000019743252001020010100101853104916955200352003518451318718100101002020020200354211100211091010010100000640263221979220000100102003620036200362003620036
10024200351500611000019743252001020010100101853104916955200352003518451318718100101002020020200354211100211091010010100000640263221979220000100102003620036200362003620036
1002420035150231611000019743252001020010100101853104916955200352003518451318718100101002020020200354211100211091010010100000640263221979220000100102003620036200362003620036

Test 3: Latency 1->3

Code:

  add x0, x1, x0, 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)0318191e1f3f4c4d51schedule 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)a9accfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? int retires (ef)f5f6f7f8fd
10204200351500002646110000198032520100201001010018534204916955200352003518429318700101001020020200200354211102011009910010100100000710159111979120000101002003620036200362003620036
102042003515020006110000198032520100201001010018534204916955200352003518429318700101001020020200200354211102011009910010100100000710159111979120000101002003620036200362003620036
102042003515000144886110000198032520100201001010018534204916955200352003518429318700101001020020200200354211102011009910010100100000710159111979120000101002008120036200362003620036
102042003515000006110000198032520100201001010018534204916955200352003518429318700101001020020200200354211102011009910010100100000710159111979120000101002003620081200812003620036
102042003515000006110000198032520100201001010018534214916955200352003518429318700101001020020200200804211102011009910010100100000757159111979120000101002003620036200362003620036
102042003515000006110000198032520100201001010018534204916955200352003518429318700102491020020200200354211102011009910010100100000710159111979120000101002003620036200362003620036
102042003515000006110000198032520100201001010018534214916955200352003518429318700101001020020200200354211102011009910010100100000710159111979120000101002003620036200362003620036
102042003515000008410000198032520100201001010018534214916955200832003518429318700101001020020200202204211102011009910010100100000710159111979120000101002003620036200362003620036
102042003515000006110000198032520100201001010018534204916955200352003518429318700101001020020200200354211102011009910010100100000710159111979120000101002003620036200362003620036
102042003515000906110000198032520100201001010018534204916955200352003518429318700101001020020200200354211102011009910010100100000710159111979120000101002003620036200362003620036

1000 unrolls and 10 iterations

Result (median cycles for code): 2.0035

retire uop (01)cycle (02)0309l2 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
100242003514900000010310000197432520010200101001018531004916955200352003518451318718100101002020020200354211100211091010010100000000640263221979220000100102003620036200362003620036
10024200351500000006110000197432520010200101001018531004916955200352003518451318718100101002020020200354211100211091010010100000000640263221979220000100102003620036200362003620036
10024200351500000006110000197432520010200101001018531014916955200352003518451318718100101002020020200354211100211091010010100000000640263221979220000100102003620036200362003620036
10024200351500000006110000197432520010200101001018531004916955200352003518451318718100101002020020200354211100211091010010100000000640263221979220000100102003620036200362003620036
1002420035150000027906110000197432520010200101001018531004916955200352003518451318718100101002020020200354211100211091010010100000000640263221979220000100102003620036200362003620036
10024200351500000006110000197432520010200101001018531004916955200352003518451318718100101002020020200354211100211091010010100000000640263221979220000100102003620036200362003620036
10024200351500000006110000197434420010200101001018531004916955200352003518451318718100101002020020200354211100211091010010100000000640263221979220000100102003620036200362003620036
10024200351500000006110000197432520010200101001018531004916955200352003518451318718100101002020020200354211100211091010010100000000640263221979220000100102003620036200362003620036
10024200351500000006110000197432520010200101001018531004916955200352003518451318718104461002020020200354211100211091010010104400000640263221979220000100102003620036200362003620036
10024200351500000006110000197432520010200101001018531004916955200352003518451318718100101002020020200354211100211091010010100000000640263221979220000100102003620036200362003620036

Test 4: throughput

Count: 8

Code:

  add x0, x8, x9, lsr #17
  add x1, x8, x9, lsr #17
  add x2, x8, x9, lsr #17
  add x3, x8, x9, lsr #17
  add x4, x8, x9, lsr #17
  add x5, x8, x9, lsr #17
  add x6, x8, x9, lsr #17
  add x7, x8, x9, 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)03mmu table walk data (08)1e3f4c4d51schedule 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 access (a0)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)? int retires (ef)f5f6f7f8fd
802042677420000618000026094251601001601008010016431814923645026725267251661531667780100802001602002672539118020110099100801001000000051104224426717160000801002672626726267262672626726
802042672520100618000026094251601001601008010016431814923645026725267251661531667780100802001602002672539118020110099100801001000000151105225426717160000801002672626726267262672626726
802042672520000618000026094251601001601008010016431814923645026725267251661531667780100802001602002672539118020110099100801001000000051104224326717160000801002672626726267262672626726
802042672520000618000026094251601001601008010016431814923645026725267251661531667780100802001602002672539118020110099100801001000000051105224526717160000801002672626726267262672626726
802042672520000618000026094251601001601008010016431814923645026725267251661531667780100802001602002672539118020110099100801001000000051374224526717160000801002672626726267262672626726
802042672520000618000026094251601001601008010016431814923645326725267251661531667780100802001602002672539118020110099100801001000000051105225426717160000801002672626726267262672626726
802042672520000618000026094251601001601008010016431814923645026725267251661531667780100802001602002672539118020110099100801001000000051104224426717160000801002672626726267262672626726
802042672520000618000026094251601001601008010016431814923645026725267871661531667780100802001602002672539118020110099100801001000000051105224426717160000801002672626726267262672626726
802042672520000618000026094251601001601008010016431814923645026725267251661531667780100802001602002672539118020110099100801001000000051105225426717160000801002672626726267262672626726
802042672520100618000026094251601001601008010016431814923645026725267251661531667780100802001602002672539118020110099100801001000000051105224526717160000801002672626726267262672626726

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)5f60696a6d6emap 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)ec? int retires (ef)f5f6f7f8fd
800242673520006180078212802516001016019680010163142014923631267112671116623031668580010800201600202671139118002110910800101000502032233267041600000800102671226712267122671226712
800242671120006180000212802516001016001080010163142014923631267112671116623031668580010800201600202671139118002110910800101000502042254267041600000800102671226712267122671226712
8002426711200061800002128025160010160010800101631420149236312671126711166230316685800108002016002026711391180021109108001010039502042244267041600000800102671226712267122671226712
800242671120006180000212802516001016001080010163142014923631267112671116623031668580010800201600202671139118002110910800101000502042234267041600000800102671226712267122671226712
800242671120066180000212802516001016001080010163142014923631267112671116623731668580010800201600202671139118002110910800101000502032244267041600000800102671226712267122671226712
800242671120006180000212802516001016001080010163142014923631267112671116623031668580010800201600202671139118002110910800101000502032245267041600000800102671226712267122671226712
800242671120006180000212802516001016001080010163142014923631267112671116623031668580010800201600202671139118002110910800101000502032245267041600000800102671226712267122671226712
800242671120006180000212802516001016001080010163142014923631267112671116623031668580010800201600202671139118002110910800101000502032253267041600000800102671226712267122671226712
800242671120006180000212802516001016001080010163142114923631267112671116623031668580010800201600202671139118002110910800101000502052244267041600000800102671226712267122671226712
800242671120006180000212802516001016001080010163142014923631267112671116623031668580010800201600202671139118002110910800101000502042244267041600000800102671226712267122671226712