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 (uxtw, 32-bit)

Test 1: uops

Code:

  add w0, w0, w1, uxtw
  mov x0, 1
  mov x1, 2

(no loop instructions)

1000 unrolls and 1 iteration

Retires: 1.000

Issues: 1.000

Integer unit issues: 1.000

Load/store unit issues: 0.000

SIMD/FP unit issues: 0.000

retire uop (01)cycle (02)031e3f4d51schedule 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 tlb access (a0)l1d cache writeback (a8)accfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? int retires (ef)f5f6f7f8fd
10041035806186225102210001000169161103510357283868100010002000103541111001100000073141119371000100010361036103610361036
10041035706186225100010001000169160103510357283868100010002000103541111001100000073141119371000100010361036103610361036
10041035806186225100010001000169160103510357283868100010002000103541111001100000073141119371000100010361036103610361036
10041035706186225100010001000169160103510357283868100010002000103541111001100000073141119371000100010361036103610361036
10041035706186225100010001000169160103510357273868100010002000103541111001100000373141119371000100010361036103610361036
10041035806186225100010001000169160103510357283868100010002000103541111001100000073141119371000100010361036103610361036
10041035806187025100010001000169161103510357283868100010002000103541111001100000073141119371000100010361036103610361036
10041035806186225100010001000169161103510357283868100010002000103541111001100000073141119371000100010361036103610361036
10041035806186225100010001000169160103510357283868100010002000103541111001100000073141119371000100010361036103610361036
10041035806186225100010001000169160103510357283868100011712000103541111001100000073141119371000100010361036103610361036

Test 2: Latency 1->2

Code:

  add w0, w0, w1, uxtw
  mov x0, 1
  mov x1, 2

(fused SUBS/B.cc loop)

100 unrolls and 100 iterations

Result (median cycles for code): 1.0035

retire uop (01)cycle (02)031e3f4d51schedule 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)9fcfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? int retires (ef)f5f6f7f8fd
102041003575366198772510100101001010088664496955100351003585803872210100102002020010035411110201100991001010010071013711994110000101001003610036100361003610036
1020410035753876198772510100101001010088664496955100351003585803872210100102002020010035411110201100991001010010071013711994110000101001003610036100361003610036
10204100357506198772510100101001010088664496955100351003585803872210100102002020010035411110201100991001010010071013711994110000101001003610036100361003610036
10204100357506198772510100101001010088664496955100351003585803872210100102002020010035411110201100991001010010071013711994110000101001003610036100361003610036
10204100357506198772510100101001010088664496955100351003585803872210100102002020010035411110201100991001010010071013711994110000101001003610036100361003610036
10204100357506198772510100101001010088664496955100351003585803872210100102002020010035411110201100991001010010071013711994110000101001003610036100361003610036
102041003575216198772510100101001010088664496955100351003585803872210100102002020010035411110201100991001010010071013711994110000101001003610036100361003610036
10204100357506198772510100101001010088664496955100351003585803872210100102002020010035411110201100991001010010071013711994110000101001003610036100361003610036
10204100357506198772510100101001010088664496955100351003585803876810100102002020010035412110201100991001010010071013711994110000101001003610036100361003610036
10204100357506198772510100101001010088664496955100351003585803872210100102002020010035411110201100991001010010071013711994110000101001003610036100361003610036

1000 unrolls and 10 iterations

Result (median cycles for code): 1.0035

retire uop (01)cycle (02)03l2 tlb miss data (0b)191e1f3f4d51schedule 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)accfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? int retires (ef)f5f6f7f8fd
10024100807600450943986325100121001210012887794969551003510035860238740100101002020020100354111100211091010010100364024122994010000100101003610036100361003610036
100241003575000061986325100101001010010887844969551003510035860238740100101002020020100354111100211091010010101121364024122994010000100101003610036100361003610036
100241003575000061986325100101001010010887844969551003510035860238740100121002020020100354111100211091010010100064024122994010000100101003610036100361003610036
100241003575000061986325100101001010010887844969551003510035860238740100101002020020100354111100211091010010100064024122994010000100101003610036100361003610036
100241003575000061986325100101001010010887844969551003510035860238740100101002020020100354111100211091010010100064224122994010000100101003610036100361003610036
1002410035750015061986325100101001010010887844969551003510035860238740100101002020020100354111100211091010010100064024122994010000100101003610036100361003610036
100241003576000061986325100101001010010887794969551003510035860238740100101002020020100354111100211091010010100064023922994010002100101003610036100361003610036
100241012775100061986325100101001010010887844969551003510035860288740100101002020020100354111100211091010010100064224122994010002100101003610036100361003610036
100241003575000061986325100101001010010887844969551003510035860238740100101002020020100354111100211091010010100064024122994010000100101003610036100361003610036
100241003575000061986325100121001210010887794969551003510035860338740101651002020020100354111100211091010010100064024122994010000100101003610036100361003610036

Test 3: Latency 1->3

Code:

  add w0, w1, w0, uxtw
  mov x0, 1
  mov x1, 2

(fused SUBS/B.cc loop)

100 unrolls and 100 iterations

Result (median cycles for code): 1.0035

retire uop (01)cycle (02)03mmu table walk data (08)1e1f3f4d51schedule 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 access (a0)ld unit uop (a6)l1d cache writeback (a8)acc2cdcfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? int retires (ef)f5f6f7f8fd
1020410035750006198772510100101001010088664496955100801003585803872210100102002020010035411110201100991001010010000000071013711994110000101001003610036100361003610036
1020410035750006198774510100101001010088664496955100351003585803872210100102002020010035411110201100991001010010000000071013711994110000101001003610036100361003610036
1020410035760006198772510100101001010088664496955100351003585803872210100102002020010035411110201100991001010010000000071013711994110000101001003610036100361003610036
1020410035750606198772510100101001010088664496955100351003585803872210100102002020010035411110201100991001010010000000071013711994110000101001003610036100361003610036
1020410035750006198772510100101001010088664496955100351003585803872210100102002020010070411110201100991001010010000000071013711994110000101001003610036100361003610036
1020410035750906198772510100101001010088664496955100351003585803872210100102002020010035411110201100991001010010000000071013711994110000101001003610036100361003610036
1020410035750906198772510100101001010088664496955100351003585803872210100102002020010035411110201100991001010010000000071013711994110000101001003610036100361003610036
102041003575001766198772510100101001010088664496955100351003585803872210100102002020010035411110201100991001010010000000071013711994110000101001003610036100361003610036
1020410128750006198772510100101001010088664496955100351003585803872210100102002020010035413110201100991001010010000000071013711994110000101001003610036100361003610036
1020410035750006198772510100101001010088664496955100351003585803872210100102002020010035411110201100991001010010030030071013711994110000101001003610036100361003610036

1000 unrolls and 10 iterations

Result (median cycles for code): 1.0035

retire uop (01)cycle (02)031e3f4d51schedule 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)cfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? int retires (ef)f5f6f7f8fd
100241003575061986325100101001010010887841496955100351003586023874010010100202002010035411110021109101001010064024122994010000100101003610036100361003610036
100241003575061986325100101001010010887841496955100351003586023874010010100202002010035411110021109101001010064024122994010000100101003610036100361003610036
100241003575061986325100101001010010887841496955100351003586023874010010100202002010035411110021109101001010064024122994010000100101003610036100361003610036
100241003575061986325100101001010010887841496955100351003586023874010010100202002010035411110021109101001010064024112994010000100101003610036100361003610036
100241003575061986325100101001010174887840496955100351003586023874010010100202002010035411110021109101001010064024122994010000100101003610036100361003610036
100241003576061986325100101001010010887840496955100351003586023874010010102322002010035411110021109101001010064024122994010000100101003610036100361003610036
100241003575061986325100101001010010887841496955100351003586023874010010100202002010035411110021109101001010064024122994010000100101003610036100361003610036
100241003575061986325100101001010010887841496955100351003586023874010010100202002010035411110021109101001010064024122994010000100101003610036100361003610036
100241003575061986325100101001010010887841496955100351003586023874010010100202002010035411110021109101001010064024122994010000100101003610036100361003610036
100241003575061986325100101001010010887841496955100351003586023874010010100202002010035411110021109101001010064024122994010000100101003610036100361003610036

Test 4: throughput

Count: 8

Code:

  add w0, w8, w9, uxtw
  add w1, w8, w9, uxtw
  add w2, w8, w9, uxtw
  add w3, w8, w9, uxtw
  add w4, w8, w9, uxtw
  add w5, w8, w9, uxtw
  add w6, w8, w9, uxtw
  add w7, w8, w9, uxtw
  mov x8, 9
  mov x9, 10

(fused SUBS/B.cc loop)

100 unrolls and 100 iterations

Result (median cycles for code divided by count): 0.1673

retire uop (01)cycle (02)03181e1f3f51schedule uop (52)schedule int uop (53)dispatch int uop (56)int uops in schedulers (59)60696a6b6d6emap 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)a9accfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? int retires (ef)f5f6f7f8fd
8020413420100024035258010080100801004005000491030601338613386332303334180100802001602001338639118020110099100801001000005110419331338380000801001338713387133871338713387
8020413386100000119258010080100801004005000491030601338613386332303334180100802001602001338639118020110099100801001000005111319321338380000801001338713387133871338713387
802041338610000035258010080100801004005000491030601338613386333003334180100802001602001338639118020110099100801001000005111319321338380000801001338713387133871338713387
802041338610000035258010080100801004005000491030601338613386332303334180100802001602001338639118020110099100801001000005110219331338380000801001338713387133871338713387
802041338610000035258010080100801004005000491030601338613386332303334180100802001602001338639118020110099100801001000005111319321338380000801001338713387133871338713387
802041338610000035258010080100801004005000491030601338613386332303334180100802001602001338639118020110099100801001000005110219231338380000801001338713387133871338713387
802041338610000035258010080100801004005000491030601338613386332303334180100802001602001338639118020110099100801001000005110219331338380000801001338713387133871338713387
802041338610000035258010080100801004005000491030601338613386332303334180100802001602001338639118020110099100801001000005110319321338380000801001338713387133871338713387
802041338610000035258010080100801004005000491030601338613386332303334180100802001602001338639118020110099100801001000005111319331338380000801001338713387133871338713387
802041338610100035258010080100801004005000491030601338613386332303334180100802001602001338639118020110099100801001000005111319231338380000801001338713387133871338713387

1000 unrolls and 10 iterations

Result (median cycles for code divided by count): 0.1671

retire uop (01)cycle (02)03mmu table walk instruction (07)l2 tlb miss instruction (0a)l2 tlb miss data (0b)18191e3f51schedule 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
80024133861000000093525800108001080010400050149102911337113371333033348800108002016002013371391180021109108001010005022719871336880000800101337213372133721337213372
80024133711000000003525800108001080010400050049102911337113371333033348800108002016002013371391180021109108001010005021719881336880000800101337213372133721337213372
80024133711000000003525800108001080010400050149102911337113371333033348800108002016002013371391180021109108001010005021819681336880000800101337213372133721337213372
80024133711000000003525800108001080010400050149102911337113371333033348800108002016029413371391180021109108001010005021619761336880000800101337213372133721337213372
80024133711000000003525800108001080010400050149102911337113371333033348800108002016002013371391180021109108001010005021719661336880000800101337213372133721337213372
80024133711000000003525800108001080010400050049102911337113371333033348800108002016002013371391180021109108001010005021719761336880000800101337213372133721337213372
80024133711000000003525800108001080010400050049102911337113371333033348800108002016002013371391180021109108001010005022719781336880000800101337213372133721337213372
80024133711000000003525800108001080010400050049102911337113371333033348800108002016002013371391180021109108001010005021719981336880000800101337213372133721337213372
80024133711000000003525800108001080010400050149102911337113371333033348800108002016002013371391180021109108001010005021919771336880000800101337213372133721337213372
800241337110000000123525800108001080010400050149102911337113371333033348800108002016002013371391180021109108001010105022719781336880000800101337213372171341337213372