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, lsr, 32-bit)

Test 1: uops

Code:

  sub 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)03mmu table walk data (08)09l2 tlb miss data (0b)18191e3f4c4d51schedule 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
100420351500000061100017352520002000100032570120352035157531842100010002000203542111001100000732673317812000100020362036203620362036
100420351500000061100017352520002000100032570120352035157531842100010002000203542111001100000732673317812000100020362036203620362036
100420352100000061100017352520002000100032570020352035157531842100010002000203542111001100000733673317812000100020362036203620362036
1004203516000009128100017352520002000100032570020352035157531842100010002000203542111001100000733673317812000100020362036203620362036
100420351510000061100017352520002000100032570020352035157531842100010002000203542111001100010733673317812000100020362036203620362036
100420351500000061100017352520002000100032570020352035157531842100010002000203542111001100000732673317812000100020362036203620362036
100420351600000061100017352520002000100032570020352035157531842100010002000203542111001100000733672317812000100020362036203620362036
100420351700000061100017352520002000100032570120352035157531842100010002000203542111001100000732672317812000100020362036203620362036
100420351600000061100017352520002000100032570020352035157531842100010002000203542111001100000733673317812000100020362036203620362036
100420351500000095100017352520002000100032570120352035157531842100010002000203542111001100000733673317812000100020362036203620362036

Test 2: Latency 1->2

Code:

  sub 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)03191e3f4c4d51schedule 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)acbranch mispred nonspec (cb)cfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? int retires (ef)f5f6f7f8fd
102042003515000251100001980325201002010010100185342149169552003520035184293187001010010200202002003542111020110099100101001000000710159111979120000101002003620036200362003620036
10204200351500061100001980325201002010010100185342149169552003520035184293187001010010200202002003542111020110099100101001000000710159111979120000101002003620036200362003620036
10204200351500061100001980325201002010010100185342049169552003520035184293187001010010200202002003542111020110099100101001000000710159111979120000101002003620036200362003620036
102042003515000445100001980325201002010010100185342149169552003520035184293187001010010200202002003542111020110099100101001000000710159111979120000101002003620036200362003620036
102042003515000219100001980325201002010010100185342149169552003520035184293187001010010200202002003542111020110099100101001000000710159111979120000101002003620036200362003620036
10204200351500061100001980325201002010010100185342149169552003520035184293187001010010200202002003542111020110099100101001000000710159111979120000101002003620036200362003620036
10204200351500061100001980325201002010010100185342149169552003520035184293187001010010200202002003542111020110099100101001000000710159111979120000101002003620036200362003620036
10204200351500061100001980325201002010010100185342149169552003520035184293187001010010200202002003542111020110099100101001000000710159111979120000101002003620036200362003620036
10204200351500061100001980325201002010010100185342149169552003520035184293187001010010200202002003542111020110099100101001000000710159111979120000101002003620036200362003620036
102042003515000536100001980325201002010010100185342149169552003520035184293187001010010200202002003542111020110099100101001000000710159111979120000101002003620036200362003620036

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)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
100242003515096110000197432520010200101001018531014916955200352003518451318718100101002020020200354211100211091010010100640363221979220000100102003620036200362003620036
100242003515006110000197432520010200101001018531004916955200352003518451318718100101002020020200354211100211091010010100640263221979220000100102003620036200362003620036
100242003515006110000197432520010200101001018531004916955200352003518451318718100101002020020200354211100211091010010100640263221986020000100102003620036200362003620036
100242003515006110000197432520010200101001018531004916955200352003518451318718100101002020020200354211100211091010010100640263221979220000100102003620036200362003620036
100242003515006110000197432520010200101001018531014916955200352003518451318718100101002020020200354211100211091010010100640263221979220000100102003620036200362003620036
100242003515006110000197432520010200101001018531014916955200352003518451318718100101002020020200354211100211091010010100640263221979220000100102003620036200362003620036
100242003515006110000197432520010200101001018531004916955200352003518451318718100101002020020200354211100211091010010100640263221979220000100102003620036200362003620036
100242003515006110000197432520010200101001018531004916955200352003518451318718100101002020020200354211100211091010010100640263221979220000100102003620036200362003620036
100242003515006110000197432520010200101001018531004916955200352003518451318718100101002020020200354211100211091010010100640263221979220000100102003620036200362003620036
100242003515006110000197432520010200101001018531014916955200352003518451318718100101002020020200354211100211091010010100640263221979220000100102003620036200362003620036

Test 3: Latency 1->3

Code:

  sub 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)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)accfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? int retires (ef)f5f6f7f8fd
10204200351500611000019803252010020100101001853421491695520035200351842931870010100102002020020035421110201100991001010010000710159111979120000101002003620036200362003620036
10204200351490611000019803252010020100101001853420491695520035200351842931870010100102002020020035421110201100991001010010000710159111979120000101002003620036200362003620036
102042003515021611000019803252010020100101001853420491695520035200351842931870010100102002020020035421110201100991001010010000710159111979120000101002003620036200362003620036
10204200351500611000019803252010020100101001853421491695520035200351842931870010100102002020020035421110201100991001010010000710159111979120000101002003620036200362003620036
10204200351500611000019803252010020100101001853420491695520035200351842931870010100102002020020035421110201100991001010010000710159111979120000101002003620036200362003620036
10204200351500611000019803252010020100101001853420491695520035200351842931870010100102002020020035421110201100991001010010000710159111979120000101002003620036200362003620036
102042003515005071000019803252010020100101001853421491695520035200351842931870010100102002020020035421110201100991001010010000710159111979120000101002003620036200362003620036
10204200351500611000019803252010020100101001853420491695520035200351842931870010100102002020020035421110201100991001010010033710159111979120000101002003620036200362003620036
10204200351500611000019803252010020100101001853421491695520035200351842931870010100102002020020035421110201100991001010010000710159111979120000101002003620036200362003620036
10204200351500611000019803252010020100101001853420491695520035200351842931870010100102002020020035421110201100991001010010000710159111979120000101002003620036200362003620036

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)9fl1d cache writeback (a8)accfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? int retires (ef)f5f6f7f8fd
10024200351500961100001974325200102001010010185310049169552003520035184513187181001010020200202003542111002110910100101003640263221979220000100102003620036200362003620036
100242003515011261100181975025200102001010010185310049169552003520080184513187181001010020200202003542111002110910100101003640263221979220000100102003620036200362003620036
1002420035150030659100091978825200102003410010185310049169552003520035184513187181001010020200202003542111002110910100101000640263221979220000100102003620036200362003620036
10024200351500061100001974325200102001010010185310049169552003520035184513187181001010020200202003542111002110910100101010640263221979220000100102003620036200362003620036
10024200351500061100001974325200102001010010185310149169552003520035184513187181001010020200202003542111002110910100101000640263221979220000100102003620036200362003620036
100242003515003156100001974325200102001010010185310049169552003520035184513187181001010020200202003542111002110910100101003640263221979220000100102003620036200362003620036
10024200351500061100001974345200102001010010185310049169552003520035184513187181001010020200202003542111002110910100101000640263221979220000100102003620036200362003620036
10024200351500061100001974325200102001010010185310149169552003520035184513187181001010020200202003542111002110910100101000640263221979220000100102003620036200362003620036
10024200351500061100001974325200102001010010185310049169552003520035184513187181001010020200202003542111002110910100101000640263221979220000100102003620036200362003620036
10024200351500061100001974325200102001010010185310049169552003520035184513187181001010020200202003542111002110910100101000640263221979220000100102003620036200362003620036

Test 4: throughput

Count: 8

Code:

  sub w0, w8, w9, lsr #17
  sub w1, w8, w9, lsr #17
  sub w2, w8, w9, lsr #17
  sub w3, w8, w9, lsr #17
  sub w4, w8, w9, lsr #17
  sub w5, w8, w9, lsr #17
  sub w6, w8, w9, lsr #17
  sub 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)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)9fbranch mispred nonspec (cb)cfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? int retires (ef)f5f6f7f8fd
80204267502010618000026094251601001601008010016431849236452672526725166153166778010080200160200267253911802011009910080100100051102221126717160000801002672626726267262672626726
80204267252000618000026094251601001601008010016431849236452672526725166153166778010080200160200267253911802011009910080100100051101221126717160000801002672626726267262672626726
80204267252000618000026094251601001601008010016431849236452672526725166153166778010080200160200267253911802011009910080100100051101221126717160000801002672626726267262672626726
80204267252000618000026094251601001601008010016431849236452672526725166153166778010080200160200267253911802011009910080100100051101221126717160000801002672626726267262672626726
80204267252000618000026094251601001601008010016431849236452672526725166153166778010080200160200267253911802011009910080100100051101221126717160000801002672626726267262672626726
80204267252000618000026094251601001601008010016431849236452672526725166153166778010080200160200267253911802011009910080100100051101221126717160000801002672626726267262672626726
80204267252000618000026094251601001601008010016431849236452672526725166153166778010080200160200267253911802011009910080100100051101221126717160000801002672626726267262672626726
80204267252000618000026094251601001601008010016431849236452672526725166153166778010080200160200267253911802011009910080100100051101221126717160000801002672626726267262672626726
80204267252000618000026094251601001601008010016431849236452672526725166153166778010080200160200267253911802011009910080100100051101221126717160000801002672626726267262672626726
80204267252000618000025208251601001601008010016431849236452672526725166153166778010080200160200267253911802011009910080100100051101221126717160000801002672626726267262672626726

1000 unrolls and 10 iterations

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

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)9fl1d cache writeback (a8)acc2cfd0d5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)ec? int retires (ef)f5f6f7f8fd
8002426717200006180000212802516001016001080010163142049236312671126711166233166858001080020160020267113911800211091080010100005020072286267041600000800102671226712267122671226712
8002426711200006180000212802516001016001080010163142149236312671126711166233166858001080020160020267113911800211091080010100005020052277267041600000800102671226712267122671226712
8002426711200006180000212802516001016001080010163142149236312671126711166233166858001080020160020267113911800211091080010100005020062285267041600000800102671226712267122671226712
8002426711200006180000212802516001016001080010163142049236312671126711166233166858001080020160020267118811800211091080010100005020082255267041600000800102671226712267122671226712
8002426711200006180000212802516001016001080010163142149236312671126711166233166858001080020160020267113911800211091080010100005020082275267041600000800102671226712267122671226712
8002426711200006180000212802516001016001080010163142049236312671126711166233166858001080020160020267113911800211091080010100005020052256267041600000800102671226712267122671226712
8002426711200006180000212802516001016001080010163142049236312671126711166233166858001080020160020267113911800211091080010100005020082268267041600000800102671226712267122671226712
8002426711200006180000212802516001016001080010163142149236312671126711166233166858001080020160020267113911800211091080010100005020052275267041600000800102671226712267122671226712
80024267112000063180000212802516001016001080010163142149236312671126711166233166858001080020160020267113911800211091080010100005020062257267041600000800102671226712267122671226712
80024267112000061800002128025160010160010800101631421492363126711267111662331668580010800201600202671139118002110910800101000050200722762670416000017800102671226712267122671226712