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 (sxth, 64-bit)

Test 1: uops

Code:

  add 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)031e1f3f4c4d51schedule 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
10042035150061100017352520002000100032570020352035157531842100010002000203542111001100000731671117812000100020362036203620362036
10042035150061100017352520002000100032570020352035157531842100010002000203542111001100000731671117812000100020362036203620362036
10042035153061100017352520002000100032570020352035157531842100010002000203542111001100000731671117812000100020362036203620362036
10042035160061100017352520002000100032570020352035157531842100010002000203542111001100000731671117812000100020362036203620362036
10042035160061100017352520002000100032570020352035157531842100010002000203542111001100000731671117812000100020362036203620362036
10042035150061100017352520002000100032570020352035157531842100010002000203542111001100000731671117812000100020362036203620362036
10042035150061100017352520002000100032570020352035157531842100010002000203542111001100000731671117812000100020362036203620362036
100420351521061100017352520002000100032570120352035157531842100010002000203542111001100000731671117812000100020362036203620362036
10042035150061100017352520002000100032570020352035157531842100010002000203542111001100000731671117812000100020362036203620362036
10042035150061100017352520002000100032570020352035157531842100010002000203542111001100000731671117812000100020362036203620362036

Test 2: Latency 1->2

Code:

  add 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)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)ld unit uop (a6)l1d cache writeback (a8)accfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? int retires (ef)f5f6f7f8fd
102042003515000061100001980325201002010010100185342149169552003520035184293187001010010200202002003542111020110099100101001000000710159111979120000101002003620036200362003620036
102042003515000061100001980345201002010010100185342149169552003520035184293187001010010200202002003542111020110099100101001000000710159111979120000101002003620036200362003620036
102042003515006061100001980325201002010010100185342149169552003520035184293187001010010200202002003542111020110099100101001000000710159111979120000101002003620036200362003620036
102042003515000061100001980325201002010010100185342149169552003520035184293187001010010200202002003542111020110099100101001000000710159111979120000101002003620036200362003620036
102042003515000061100001980325201002010010100185342149169552003520035184293187001010010200202002003542111020110099100101001000000710159111979120000101002003620036200362003620036
102042003515000061100001980325201002010010100185342149169552003520035184293187001010010200202002003542111020110099100101001000000710159111979120000101002003620036200362003620036
102042003515000061100001980325201002010010100185342149169552003520035184293187001010010200202002003542111020110099100101001000000710159111979120000101002003620036200362003620036
102042003515000061100001980325201002010010100185342149169552003520035184293187001010010200202002003542111020110099100101001000000710159111979120000101002003620036200362003620036
102042003515000061100001980325201002010010100185342149169552003520035184293187001010010200202002003542111020110099100101001000000710159111979120000101002003620036200362003620036
102042003515000061100001980325201002010010100185342149169552003520035184293187001010010200202002003542111020110099100101001000000710159111979120000101002003620036200362003620036

1000 unrolls and 10 iterations

Result (median cycles for code): 2.0035

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)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
100242003515000001241000019743252001020010100101853101491695520035200351845131871810010100202002020035421110021109101001010000640263221979220000100102003620036200362003620036
100242003515000039611000019743252001020010100101853100491695520035200351845131871810010100202002020035421110021109101001010000640263221979220000100102003620036200362003620036
10024200351500000611000019743252001020010100101853100491695520035200351845131871810010100202002020035421110021109101001010000640263221979220000100102003620036200362003620036
100242003515000001031000019743252001020010100101853101491695520035200351845131871810010100202002020035421110021109101001010000640263221979220000100102003620036200362003620036
10024200351500000611000019743252001020010100101853100491695520035200351845131871810010100202002020035421110021109101001010000640263221979220000100102003620036200362003620036
100242003515000012611000019743252001020010100101853101491695520035200351845131871810010100202002020035421110021109101001010000640263221979220000100102003620036200362003620036
10024200351500000611000019743252001020010100101853101491695520035200351845131871810010100202002020035421110021109101001010000640363221979220000100102003620036200362003620036
10024200351500000611000019743252001020010100101853101491695520035200351845131871810010100202002020035421110021109101001010103640263221979220000100102003620036200362003620036
10024200351490000611000019743252001020010100101853101491695520035200351845131871810010100202002020035421110021109101001010000640263221979220000100102003620036200362003620036
10024200351500000611000019743252001020010100101853101491695520035200351845131871810010100202002020035421110021109101001010000682263221979220000100102003620036200362003620036

Test 3: Latency 1->3

Code:

  add 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)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
1020420035150486110000198032520100201001010018534214916955200352003518429318700101001020020200200354211102011009910010100100710159111979120000101002003620036200362003620036
1020420035150186110000198032520100201001010018534214916955200352003518429318700101001020020200200354211102011009910010100100710159111979120000101002003620036200362003620036
102042003515006110000198032520100201001010018534219816955200352003518429318700101001020020200200354211102011009910010100100710159111979120000101002003620036200362003620036
102042003515006110000198032520100201001010018534214916955200352003518429318700101001020020200200354211102011009910010100100710159111979120000101002003620036200362003620036
102042003515006110000198032520100201001010018534214916955200352003518429318700101001020020200200354211102011009910010100100710159111979120000101002003620036200362003620036
1020420035150216110000198032520100201001010018534214916955200352003518429318700101001020020200200354211102011009910010100100710159111979120000101002003620036200362003620036
1020420035150216110000198032520100201001010018534214916955200352003518429318700101001020020200200354211102011009910010100100710159111979120000101002003620036200362003620036
102042003515006110000198032520100201001010018534214916955200352003518429318700101001020020200200354211102011009910010100100710159111979120000101002003620036200362003620036
102042003515006110000198032520100201001010018534214916955200352003518429318700101001020020200200354211102011009910010100100710159111979120000101002003620036200362003620036
1020420035150666110000198032520100201001010018534214916955200352003518429318700101001020020200200354211102011009910010100100710159111979120000101002003620036200362003620036

1000 unrolls and 10 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)9fl1d cache writeback (a8)accfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? int retires (ef)f5f6f7f8fd
1002420035150022261100001974325200102001010010185310149169552003520035184513187181001010020200202003542111002110910100101000640263221979220000100102003620036200362003620036
10024200351500061100001974325200102001010010185310149169552003520035184513187181001010020200202003542111002110910100101003640263221979220000100102003620036200362003620036
100242003515005161100001974325200102001010010185310149169552003520035184513187181001010020200202003542111002110910100101000640263221979220000100102003620036200362003620036
10024200351500061100001974325200102001010010185310149169552003520035184513187181001010020200202003542111002110910100101000640263221979220000100102003620036200362003620036
1002420035150044161100001974325200102001010010185310149169552003520035184513187181001010020200202003542111002110910100101000640263221979220000100102003620036200362003620036
100242003515000536100001974325200102001010010185310149169552003520035184513187181001010020200202003542111002110910100101000640263221979220000100102003620036200362003620036
10024200351500061100001974325200102001010010185310149169552003520035184513187181001010020200202003542111002110910100101000640263221979220000100102003620036200362003620036
100242003515005461100001974325200102001010010185310149169552003520035184513187181001010020200202003542111002110910100101000640263221979220000100102003620036200362003620036
10024200351500361100001974325200102001010010185310149169552003520035184513187181001010020200202003542111002110910100101000640263221979220000100102003620036200362003620036
10024200351500061100001974325200102003410010185310149169552003520035184513187181001010020200202003542111002110910100101000640263221979220000100102003620036200362003620036

Test 4: throughput

Count: 8

Code:

  add x0, x8, w9, sxth
  add x1, x8, w9, sxth
  add x2, x8, w9, sxth
  add x3, x8, w9, sxth
  add x4, x8, w9, sxth
  add x5, x8, w9, sxth
  add x6, x8, w9, sxth
  add 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)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)a9accfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? int retires (ef)f5f6f7f8fd
802042676720001416180000260942516010016010080100164318149236452672526725166153166778010080200160200267253911802011009910080100100000051102221126717160000801002672626726267262672626726
80204267252000156180000260942516010016010080100164318049236452672526725166153166778010080200160200267253911802011009910080100100000051101221126717160000801002672626726267262672626726
8020426725200096180000260942516010016010080100164318049236452672526725166153166778010080200160200267253911802011009910080100100000051101221126717160000801002672626726267262672626726
80204267252010186180000260942516010016010080100164318149236452672526725166153166778010080200160200267253911802011009910080100100000051102221126717160000801002672626726267262672626726
8020426725200006180000260942516010016010080100164318049236452672526725166153166778010080200160200267253911802011009910080100100000051101221126717160000801002672626726267262672626726
8020426725201008480000260942516010016010080100164318149236452672526725166153166778010080200160200267253911802011009910080100100000051101221126717160000801002672626726267262672626726
8020426725200066180000260942516010016010080100164318049236452672526725166153166778010080200160200267253911802011009910080100100000051101221126717160000801002672626726267262672626726
80204267252000126180000260942516010016010080100164318049236452672526725166153166778010080200160200267253911802011009910080100100000051101221126717160000801002672626726267262672626726
80204267252000156180000260942516010016010080100164318049236452672526725166153166778010080200160200267253911802011009910080100100000051101221126717160000801002672626726267262672626726
802042672520001296180000260942516010016010080100164318149236452672526725166153166778010080200160200267253911802011009910080100100000051101221126717160000801002672626726267262672626726

1000 unrolls and 10 iterations

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

retire uop (01)cycle (02)03mmu table walk data (08)l2 tlb miss instruction (0a)l2 tlb miss data (0b)18191e1f3f4c4d51schedule uop (52)schedule int uop (53)dispatch int uop (56)int uops in schedulers (59)6061696a6d6emap 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 access (a0)l1d tlb miss (a1)ld unit uop (a6)l1d cache writeback (a8)a9accdcfd0d2d5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? int retires (ef)f5f6f7f8fd
800242671820000000006180000212802516001016001080010163142104923631267112671116623031668580010800201600202671139118002110910800101000000005020003226526704160000800102671226771267122671226770
800242671120000000006180000212802516001016001080010163142154923631267112671116623031668580010800201600202671139118002110910800101000000005020515223226704160000800102671226712267122671226712
800242671120000000006180000212802516001016001080010163142154923631267112671116623731668580010800201600202671139118002110910800101000000005020525225326704160000800102671226712267122671226712
800242671120000000006180000212802516001016001080010163142004923631267112671116623031668580010800201600202671139118002110910800101000000005020525225526704160000800102671226712267122671226712
80024267112000000021606180000212802516001016001080010163142154923631267112671116623031668580010800201600202671139118002110910800101000000005020522223626704160000800102671226712267122671226712
800242671120000000606180000212802516001016001080010163142154923631267112671116623031668580010800201600202671139118002110910800101000000005020522222326704160000800102671226712267122671226712
80024267112000000018306180000212802516001016001080010163142154923631267112671116623031668580010800201600202671139118002110910800101000000005020525223226704160000800102671226712267122671226712
800242671120000000006180000212802516001016001080010163142154923631267112671116623031668580010800201600202671139118002110910800101000000005020003223226704160000800102671226712267122671226712
800242671120000000006180000212802516001016001080010163142154923631267112671116623031668580010800201600202671139118002110910800101000000005020003223826704160000800102671226712267122671226712
8002426711200000002406180000212802516001016001080010163142154923631267112671116623031668580010800201600202671139118002110910800101000000005020532223226704160000800102671226712267122671226712