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 (register, asr, 64-bit)

Test 1: uops

Code:

  sub x0, x0, x1, asr #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)033f4c4d51schedule 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)cfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)ec? int retires (ef)f5f6f7f8fd
100420351561100017352520002000100032570020352035157531842100010002000203542111001100007326722178120000100020362036203620362036
100420351561100017352520002000100032570020352035157531842100010002000203542111001100007326722178120000100020362036203620362036
100420351561100017352520002000100032570020352035157531842100010002000203542111001100007326722178120000100020362036203620362036
100420351561100017352520002000100032570020352035157531842100010002000203542111001100007326722178120000100020362036203620362036
100420351661100017352520002000100032570020352035157531842100010002000203542111001100007326722178120000100020362036203620362036
100420351589100017352520002000100032570020352035157531842100010002000203542111001100007326722178120000100020362036203620362036
100420351877100017352520002000100032570020352035157531842100010002000203542111001100007326722178120000100020362036203620362036
100420351561100017352520002000100032570020352035157531842100010002000203542111001100007326722178120000100020362036203620362036
100420351682100017352520002000100032570020352035157531842100010002000203542111001100007326722178120000100020362036203620362036
100420351561100017352520002000100032570020352035157531842100010002000203542111001100007326722178120000100020362036203620362036

Test 2: Latency 1->2

Code:

  sub x0, x0, x1, asr #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)03l2 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)9fld 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
102042003515001566100001980325201002010010100185342049169552003520035184293187001010010200202002003542111020110099100101001000000710159111979120000101002003620036200362003620036
10204200351500961100001980325201002010010100185342149169552003520035184293187001010010200202002003542111020110099100101001000000710159111979120000101002003620036200362003620036
102042003515000103100001980325201002010010100185342149169552003520035184293187001010010200202002003542111020110099100101001000000710159111979120000101002003620036200362003620036
10204200351500061100001980325201002010010100185342149169552003520035184293187001010010200202002003542111020110099100101001000000710159111979120000101002003620036200362003620036
10204200351500061100001980325201002010010100185342149169552003520035184293187551010010200202002003542111020110099100101001000000710159111979120000101002003620036200362003620036
10204200351500061100001980325201002010010100185342149169552003520035184293187001010010200202002003542111020110099100101001000000710159111979120000101002003620036200362003620036
10204200351500061100001980325201002010010100185342149169552003520035184293187001010010200202002003542111020110099100101001000000710159111979120000101002003620036200362003620036
1020420035150053761100001980325201002010010100185342149169552003520035184293187001010010200202002003542111020110099100101001000000710159111979120000101002003620036200362003620036
10204200351500061100001980325201002010010100185342149169552003520035184293187001010010200202002003542111020110099100101001000000710159111979120000101002003620036200362003620036
10204200351500061100001980325201002010010100185342149169552003520035184293187001010010200202002003542111020110099100101001000000710159111979120000101002003620036200362003620036

1000 unrolls and 10 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)acbranch mispred nonspec (cb)cfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? int retires (ef)f5f6f7f8fd
1002420035149015611000019743252001020010100101853100491695520035200351845131871810010100202002020035421110021109101001010000640263221979220000100102003620036200362003620036
1002420035150001051000019743252001020010100101853100491695520035200351845131871810010100202002020035422110021109101001010000640263221979220000100102003620036200362003620036
100242003515000611000019743252001020010100101853100491695520035200351845131871810010100202002020035421110021109101001010000640263221979220000100102003620036200362003620036
10024200351500141611000019743252001020010100101853100491695520035200351845131871810010100202002020035421110021109101001010600640263221979220000100102003620036200362003620036
100242003515000611000019743252001020010100101853100491695520035200351845131871810010100202002020035421110021109101001010000640263221979220000100102003620036200362003620036
100242003515500611000019743252001020010100101853100491695520035200351845131871810010100202002020035421110021109101001010000640263221979220000100102003620036200362003620036
100242003515000611000019743252003320010100101853100491695520035200351845131871810010100202002020035421110021109101001010000640263221979220000100102003620036200362003620036
100242003515006611000019743252001020010100101853100491695520035200351845131871810010100202002020035421110021109101001010000640263221979220000100102003620036200362003620036
100242003515030611000019743252001020010100101853100491695520035200351845131871810010100202002020035421110021109101001010000640263221979220000100102003620036200362003620036
100242003515000611000019743252001020010100101853100491695520035200351845131871810010100202002020035421110021109101001010000640263221979220000100102003620036200362003620036

Test 3: Latency 1->3

Code:

  sub x0, x1, x0, asr #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)l2 tlb miss data (0b)1e3a3f4c4d51schedule 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)accdcfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? int retires (ef)f5f6f7f8fd
102042003515000006110000198032520100201001010018534214916955200352003518429318700101001020020200200354211102011009910010100100000710259221979120000101002003620036200362003620036
102042003515000006110000198032520100201001010018534214916955200352003518429318700101001020020200200354211102011009910010100100000710259221979120000101002003620036200362003620036
10204200351500027061100001980325201002010010100185342149169552003520035184293187001010010200202002003542111020110099100101001000810710259221979120000101002003620036200362003620036
102042003515000240611000019803252010020100101001853421491695520035200351842931870010100102002020020035421110201100991001010010001200710259221979120000101002003620036200362003620036
102042003514900006110000198032520100201001010018534214916955200352003518429318700101001020020200200354211102011009910010100100000710259221979120000101002003620036200362003620036
102042003514900006110000198032520100201001010018534214916955200352003518429318700101001020020200200354211102011009910010100100000710259221979120000101002003620036200362003620036
102042003515000006110000198032520100201001010018534214916955200352003518429318700101001020020200200354211102011009910010100100000710259221979120000101002003620036200362003620036
10204200351500000611000019803252010020100101001853421491695520035200351842931870010100102002020020035421110201100991001010010001020710259221979120000101002003620036200362003620036
102042003515000006110000198032520100201001010018534214916955200352003518429318700101001020020200200354211102011009910010100100000710259221979120000101002003620036200362003620036
10204200351500000611000019803252010020100101001853421491695520035200351842931870010100102002020020035421110201100991001010010001260710259221979120000101002003620036200362003620036

1000 unrolls and 10 iterations

Result (median cycles for code): 2.0035

retire uop (01)cycle (02)03181e1f3f4c4d51schedule 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)ld unit uop (a6)l1d cache writeback (a8)accfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? int retires (ef)f5f6f7f8fd
10024200351500180611000019743252001020010100101853104916955200352003518451318718100101002020020200354211100211091010010100000640263221979220000100102003620036200362003620036
1002420035150000611000019743252001020010100101853104916955200352003518451318718100101002020020200354211100211091010010100000640263221979220000100102003620036200362003620036
1002420035150000611000019743252001020010100101853104916955200352003518451318718101651002020020200354211100211091010010100000640263221979220000100102003620036200362003620036
1002420035150000611000019743252001020010100101853104916955200352003518451318718100101002020020200354211100211091010010100000640263221979220000100102003620036200362003620036
100242003515000176611000019743252001020010100101853104916955200352003518451318718100101002020020200354211100211091010010100000640263221979220000100102003620036200362003620036
1002420035150000611000019743252001020010100101853104916955200352003518451318718100101002020020200354211100211091010010100000640263221979220000100102003620036200362003620036
1002420035150000611000019743252001020010100101853104916955200352003518451318718100101002020020200354211100211091010010100000640263221979220000100102003620036200362003620036
1002420035150000611000019743252001020010100101853104916955200352003518451318718100101002020020200354211100211091010010100000640263221979220000100102003620036200362003620036
1002420035150000611000019743252001020010100101853104916955200352003518451318718100101002020020200354211100211091010010100000640263221979220000100102003620036200362003620036
100242003515005370611000019743252001020010100101853104916955200352003518451318718100101002020020200354211100211091010010100000640263221979220000100102003620036200362003620036

Test 4: throughput

Count: 8

Code:

  sub x0, x8, x9, asr #17
  sub x1, x8, x9, asr #17
  sub x2, x8, x9, asr #17
  sub x3, x8, x9, asr #17
  sub x4, x8, x9, asr #17
  sub x5, x8, x9, asr #17
  sub x6, x8, x9, asr #17
  sub x7, x8, x9, asr #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)0309l2 tlb miss data (0b)191e3f4c4d51schedule uop (52)schedule int uop (53)dispatch int uop (56)int uops in schedulers (59)6067696a6d6emap 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)acbranch mispred nonspec (cb)cfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? int retires (ef)f5f6f7f8fd
802042677120000006180000260942516010016010080100164318104923645267252672516615316677801008020016020026725391180201100991008010010020138051102221126717160000801002672626726267262672626726
8020426725200000061800002609425160100160100801001643180049236452672526725166153166778010080200160200267253911802011009910080100100000051101221126717160000801002672626726267262672626726
8020426725200000061800002609425160100160100801001643180049236452672526725166153166778010080200160200267253911802011009910080100100000051372221126717160207801002678826726267262672626726
802042672520000130361800002609425160100160100801001643181049236452672526725166153166778010080200160200267253911802011009910080100100013051101221126717160000801002672626726267262672626726
80204267252001001261800002609425160100160100801001688651049236452672526725166153166778010080200160200267253911802011009910080100100010051101221126717160000801002672626726267262672626726
802042672520100012726800002609425160100160100801001643181049236452672526725166153166778010080200160200267253911802011009910080100100000051101221126717160000801002672626726267262672626726
80204267252000000618000026094251601001601008010016431810492364526725267251661531667780100802001602002672539118020110099100801001000057051101221126717160000801002672626726267262672626726
80204267252000000618000026094251601001601008010016431810492364526725267251661531667780100802001602002672539118020110099100801001000051051101222126717160000801002672626726267262672626726
80204267252010000618000026094251601001601008010016431810492364526725267251661531667780100802001602002672539118020110099100801001000066051101221126717160000801002672626726267262672626726
80204267252000000618000026094251601001601008010016431810492364526725267251661531667780100802001602002672539118020110099100801001000075051101221126717160000801002672626726267262672626726

1000 unrolls and 10 iterations

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

retire uop (01)cycle (02)03mmu table walk instruction (07)l2 tlb miss instruction (0a)191e1f3a3f4c4d51schedule uop (52)schedule int uop (53)dispatch int uop (56)int uops in schedulers (59)6061696a6b6d6emap 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)accfd0d5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? int retires (ef)f5f6f7f8fd
80024267352001100037180000212802516001016001080010163142004923631026711267111662331668580010800201600202671139118002110910800101000003502601922171026704160000800102671226712267122671226712
80024267112001100037180000212802516001016001080010163142104923631026711267111662331668580010800201600202671139118002110910800101000013502651622161626704160000800102671226712267122671226712
80024267112001100037180000212802516001016001080010163142104923631026711267111662331668580010800201600202671139118002110910800101000010502601422161826704160000800102671226712267122671226712
80024267112001100039480000212802516001016001080010163142054923631026711267111662331668580010800201600202671139118002110910800101000020502601622161326704160000800102671226712267122671226712
80024267112001100037180000212802516001016001080010163142054923631026711267111662331668580010800201600202671139118002110910800101000010502601822151526704160000800102671226712267122671226712
80024267112001100037180000212802516001016001080010163142104923631026711267111662331668580010800201600202671139118002110910800101000013503301522151626704160000800102671226712267122671226712
8002426711200110150571800772128025160010160010800101679310549236310267112671116623316685800108023916045226768393180021109108001010220039502601522151226746160000800102671226712267122671226712
800242671120011015037180000212802516001016001080010163142104923631026711267111662331668580010800201600202671139118002110910800101000010502651622111326704160000800102671226712267122671226712
80024267112001100037180000212802516001016001080010163142054923631026711267111662331668580010800201600202671139118002110910800101000030502601422161626704160000800102671226712267122671226712
8002426711200110003356800002128025160010160010800101631421049236310267112671116623251668580010800201600202671139118002110910800101000010502651522141526704160000800102671226712267122671226712