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 (sxth, 64-bit)

Test 1: uops

Code:

  sub x0, x0, w1, sxth
  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
1004203516061100017352520002000100032570020352035157531842100010002000203542111001100000731671117812000100020362036203620362036
1004203516061100017352520002000100032570020352035157531842100010002000203542111001100000731671117812000100020362036203620362036
1004203515061100017352520002000100032570020352035157531842100010002000203542111001100000731671117812000100020362036203620362036
1004203515061100017352520002000100032570020352035157531842100010002000203542111001100000731671117812000100020362036203620362036
1004203515061100017352520002000100032570020352035157531842100010002000203542111001100000731671117812000100020362036203620362036
1004203515061100017352520002000100032570020352035157531842100010002000203542111001100000731671117812000100020362036203620362036
1004203515061100017352520002000100032570020352035157531842100010002000203542111001100000731671117812000100020362036203620362036
1004203515061100017352520002000100032570020352035157531842100010002000203542111001100000731671117812000100020362036203620362036
1004203516982100017352520002000100032570020352035157531842100010002000203542111001100000731671117812000100020362036203620362036
1004203516061100017352520002000100032570020352035157531842100010002000203542111001100000731671117812000100020362036203620362036

Test 2: Latency 1->2

Code:

  sub x0, x0, w1, sxth
  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)03191e1f3f4c4d51schedule uop (52)schedule int uop (53)dispatch int uop (56)int uops in schedulers (59)696a6d6emap 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 tlb miss (a1)l1d cache writeback (a8)accfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? int retires (ef)f5f6f7f8fd
10204200351500006110000198032520100201001010018534249169552003520035184297318700101001020020200200354211102011009910010100100000710259221979120000101002003620036200362003620036
10204200351500006110000198032520100201001010018534249169552003520035184290318700101001020020200200354211102011009910010100100000710259221979120000101002003620036200362003620036
102042003515000053610000198032520100201001010018534249169552003520035184290318700101001020020200200354211102011009910010100100000710259221979120000101002003620036200362003620036
10204200351500006110000198032520100201001010018534249169552003520035184290318700101001020020200200354211102011009910010100100006710259221979120000101002003620036200362003620036
10204200351500006110000198032520100201001010018534249169552003520035184290318700101001020020200200354211102011009910010100100000710259221979120000101002003620036200362003620036
102042003515001806110000198032520100201001010018534249169552003520035184290318700101001020020200200354211102011009910010100100000710259221979120000101002003620036200362003620036
102042003515006606110000198032520100201001010018534249169552003520035184290318700101001020020200200354211102011009910010100100000710259221979120000101002003620036200362003620036
102042003515000025110000198032520100201001010018534249169552003520035184290318700101001020020200200354211102011009910010100100000710259221979120000101002003620036200362003620036
10204200351500008210000198032520100201001010018534249169552003520035184290318700101001020020200200354211102011009910010100100000710259221979120000101002003620036200362003620036
102042003515001806110000198032520100201001010018534249169552003520035184290318700101001020020200200354211102011009910010100100000710259221979120000101002003620036200362003620036

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)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
1002420035150015061100001974325200102001010010185310149169552003520035184513187181001010020200202003542111002110910100101000640263221979220000100102003620036200362003620036
100242003515000061100001974325200102001010010185310049169552003520035184513187181001010020200202003542111002110910100101000640263221979220000100102003620036200362003620036
100242003515000061100001974325200102001010010185310149169552003520035184513187181001010020200202003542111002110910100101000640263221979220000100102003620036200362003620036
100242003515003061100001974325200102001010010185310149169552003520035184513187181001010020200202003542111002110910100101000640263221979220000100102003620036200362003620036
1002420035150012061100001974325200102001010010185310149169552003520035184513187181001010020200202003542111002110910100101000640263221979220000100102003620036200362003620036
1002420035150012061100001974325200332001010010185310149169552003520035184513187181001010020200202003542111002110910100101000640263221979220000100102003620036200362003620036
100242003515000061100001974325200102001010010185310049169552003520035184513187181001010020200202003542111002110910100101000640263221979220000100102003620036200362003620036
100242003515000061100001974325200102001010010185310049169552003520035184513187181001010020200202003542111002110910100101000640263221979220000100102003620036200362003620036
100242003515000022721000019743252001020010100101853101491695520035200351845131871810010100202002020035421110021109101001010112640263221979220000100102003620036200362003620036
1002420035150012061100001974325200102001010010185310149169552003520035184513187181001010020200202003542111002110910100101000640263221979220000100102003620036200362003620036

Test 3: Latency 1->3

Code:

  sub x0, x1, w0, sxth
  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 cache writeback (a8)acbranch mispred nonspec (cb)cfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? int retires (ef)f5f6f7f8fd
102042003515003010710000198032520100201001010018534204916955200352003518429318700101001020020200200354211102011009910010100100000710259111979120000101002003620036200362003620036
102042003515001212410000198032520100201001010018534204916955200352003518429318700101001020020200200354211102011009910010100100100710159111979120000101002003620080200362003620036
10204200351500248210000198034520144201001010018534204916955200352003518429318700101001020020200200354211102011009910010100100030710159111979120000101002003620036200362003620083
1020420035150006110000198032520100201001010018534204916955200352003518429318700101001020020200200354211102011009910010100100000710159111979120000101002003620036200362003620036
1020420035150006110000198032520100201001010018534204916955200352003518429318700101001020020200200354211102011009910010100100000710159111979120000101002003620036200362003620036
102042003515002410310000198032520100201001010018534204916955200352003518429318700101001020020200200354211102011009910010100100000732159111987220000101002003620036200362003620036
102042003515002754610000198032520100201301010018534204916955200352003518429318700101001020020200200354211102011009910010100100100710159111979120000101002003620036200362003620036
102042003514901510310000198032520100201001010018534204916955200352003518429318700101001020020200200354211102011009910010100100030710159111979120000101002003620036200362003620036
1020420035150066110000198032520100201001010018534214916955200352003518429318700101001020020200200354211102011009910010100100000710159111979120000101002003620036200362003620036
102042003515001418210000198032520100201001010018534214916955200352003518429318700101001020020200200354211102011009910010100100100710159111979120000101002003620036200362003620036

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)9fcfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? int retires (ef)f5f6f7f8fd
100242003515012611000019743252001020010100101853101491695520035200351845131871810010100202002020035421110021109101001010640263221979220000100102003620036200362003620036
100242003515015611000019743252001020010100101853101491695520035200351845131871810010100202002020035421110021109101001010640263221979220000100102003620036200362003620036
100242003515035571000019743252001020010100101853100491695520035200351845131871810010100202002020035421110021109101001010640263221979220000100102003620036200362003620036
100242003515042611000019743252001020010100101853100491695520035200351845131871810010100202002020035421110021109101001010640263221979220000100102003620036200362003620036
10024200351500611000019743252001020010100101853100491695520035200351845131871810010100202002020035421110021109101001010640263221979220000100102003620036200362003620036
10024200351500611000019743252001020010100101853101491695520035200351845131871810010100202002020035421110021109101001010640263221979220000100102003620036200362003620036
100242003515021611000019743252001020010100101853101491695520035200351845131871810010100202002020035421110021109101001010640263221979220000100102003620036200362003620036
10024200351500611000019743252001020010100101853100491695520035200351845131871810010100202002020035421110021109101001010640263221979220000100102003620036200362003620036
10024200351500611000019743252001020010100101853101491695520035200351845131871810010100202002020035421110021109101001010640263221979220000100102003620036200362008120036
10024200351509821000019743252001020010100101853100491695520035200351845131871810010100202002020035421110021109101001010640263221979220000100102003620036200362003620036

Test 4: throughput

Count: 8

Code:

  sub x0, x8, w9, sxth
  sub x1, x8, w9, sxth
  sub x2, x8, w9, sxth
  sub x3, x8, w9, sxth
  sub x4, x8, w9, sxth
  sub x5, x8, w9, sxth
  sub x6, x8, w9, sxth
  sub x7, x8, w9, sxth
  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)l2 tlb miss data (0b)0f191e3f4c4d51schedule 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 miss (a1)l1d cache writeback (a8)accfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? int retires (ef)f5f6f7f8fd
8020426773200000063618000026094251601001601008010016431814923645267252672516615316677801008020016020026725391180201100991008010010000051102221126717160000801002672626726267262672626726
802042672520000000618000026094251601001601008010016431814923645267252672516615316677801008020016020026725391180201100991008010010000051101221126717160000801002672626726267262672626726
802042672520000200618000026094251601001601008010016431814923645267252672516615316677801008020016020026725391180201100991008010010000051101221126717160000801002672626726267262672626726
802042672520000000618000026094251601001601008010016431804923645267252672516615316677801008020016020026725391180201100991008010010000051101221126717160000801002672626726267262672626726
802042672520000000618000026094251601001601008010016431814923645267252672516615316677801008020016020026725391180201100991008010010000051101221126717160000801002672626726267262672626726
80204267252000003366180000260942516010016010080100164318049236452672526725166153166778010080200160200267903911802011009910080100100050051101221126717160000801002672626726267262672626726
802042672520100000618000026094251601001601008010016431814923645267252672516615316677801008020016020026725391180201100991008010010000051101221126717160000801002672626726267262672626726
802042672520000000618000026094251601001601008010016431814923645267252672516615316677801008020016020026725391180201100991008010010000051101221126717160000801002672626726267262672626726
802042672520000000898000026094251601001601008010016431814923645267252672516615316677801008020016020026725391180201100991008010010000051101221126717160000801002672626726267262672626726
802042672520000000618000026094251601001601008045716431814923645267252672516615316677801008020016020026725391180201100991008010010000051101221126717160000801002672626726267262672626726

1000 unrolls and 10 iterations

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

retire uop (01)cycle (02)03l1i tlb fill (04)mmu table walk data (08)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 tlb access (a0)l1d tlb miss (a1)l1d cache writeback (a8)a9cfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)eb? int retires (ef)f5f6f7f8fd
80024267352001063618000021280251600101600108001016314214923631267112671116623316685800108002016002026711391180021109108001010000050201722166267041600000800102671226712267122671226712
8002426711200002076180000212802516001016001080010163142149236312671126711166233166858001080020160020267113911800211091080010100000502016221616267041600000800102671226712267122671226712
80024267112000039618000021280251600101600108001016314214923631267112671116623316685800108002016002026711391180021109108001010000050201622165267041600000800102671226712267122671226712
8002426711200000618000021280251600101600108001016314214923631267112671116623316685800108002016002026711391180021109108001010000050201422136267041600000800102671226712267122671226712
800242671120000010680000212802516001016001080010163142149236312671126711166233166858001080020160020267113911800211091080010100000502016221616267041600000800102671226712267122671226712
8002426711200000618000021280251600101600108001016314214923631267112671116623316685800108002016002026711391180021109108001010000050201622616267041600000800102671226712267122671226712
800242671120000061800002128025160010160010800101631421492363126711267111662331668580010800201600202671139118002110910800101000005020622516267041600000800102671226712267122671226712
80024267112000019261800002128025160010160010800101631421492363126711267111662331668580010800201600202671139118002110910800101000005020622613267041600000800102671226712267122671226712
800242671120000186180000212802516001016001080010163142149236312671126711166233166858001080020160020267113911800211091080010100000502016221616267041600000800102671226712267122671226712
80024267112000036180000212802516001016001080010163142149236312671126711166232316685800108002016002026711391180021109108001010000050201622166267041600000800102671226712267122671226712