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, 32-bit)

Test 1: uops

Code:

  sub w0, w0, w1
  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)03091e3f4d51schedule uop (52)schedule int uop (53)dispatch int uop (56)int uops in schedulers (59)6d6emap 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)st unit uop (a7)l1d cache writeback (a8)a9accfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? int retires (ef)f5f6f7f8fd
100410358006186225100010001000169161035103572838681000100020001035411110011000030073141119371000100010361036103610361036
100410358006186225100010001000169161035103572838681000100020001035411110011000000073141119371000100010361036103610361036
100410358006186225100010001000169161035103572838681000100020001035411110011000000073141119371000100010361036103610361036
100410358006186225100010001000169161035103572838681000100020001035411110011000000073141119371000100010361036103610361036
100410358006186225100010001000169161035103572838681000100020001035411110011000000073141119371000100010361036103610361036
100410358106186225100010001000169161035103572838681000100020001035411110011000000073141119371000100010361036103610361036
100410358006186225100010001000169161035103572838681000100020001035411110011000010073141119371000100010361036103610361036
100410358006186225100010001000169161035103572838681000100020001035411110011000000073141119371000100010361036103610361036
100410358006186225100010001000169161035103572838681000100020001035411110011000000073141119371000100010361036103610361036
100410357006186225100010001000169161035103572838681000100020001035411110011000010073141119371000100010361036103610361036

Test 2: Latency 1->2

Code:

  sub w0, w0, w1
  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)60696a6d6emap 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
1020410035750619877251010010100101008866404969551003510035858003872210100102002020010035411110201100991001010010000071023722994110000101001003610036100361003610036
10204100357518619877251010010100101008866404969551003510035858003872210100102002020010035411110201100991001010010000071023722994110000101001003610036100361003610036
10204100357504169877251010010100101008866404969551003510035858003872210100102002020010035411110201100991001010010000071023722994110000101001003610036100361003610036
10204100357503999877251010010100101008866404969551003510035858003872210100102002020010035411110201100991001010010000071023722994110000101001003610036100361003610036
10204100357503119877251010010100101008866404969551003510035858003872210100102002020010035411110201100991001010010000071023722994110000101001003610036100361003610036
10204100357501309877251010010100101008866404969551003510035858003872210100102002020010082412110201100991001010010000071023722994110000101001003610036100361003610036
1020410035750619877251010010100101008866404969551003510035858003872210100102002020010035411110201100991001010010000071023722994110000101001003610036100361003610036
1020410035750619877251010010100101008866404969551003510035858003872210100102002020010035411110201100991001010010020371023722994110000101001003610036100361003610036
1020410035750619877251010010100101008866414969551003510035858003872210100102002020010035411110201100991001010010000071023722994110000101001003610036100361003610036
1020410035750619877251010010100101008866414969551003510035858003872210100102002020010035411110201100991001010010000071023722994110000101001003610036100361003610036

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)9fld unit uop (a6)l1d cache writeback (a8)accfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? int retires (ef)f5f6f7f8fd
10024100357506198632510010100101001088784049695510035100358602387401001010020200201003541111002110910100101000064044144994010000100101003610036100361003610036
100241003576786198632510010100101001088784049695510035100358602387401001010020200201003541111002110910100101000064044144994010000100101003610036100361003610036
10024100357506198632510010100101001088784049695510035100358602387401001010020200201003541111002110910100101000064034134994010000100101003610036100361003610036
10024100357506198632510010100101001088784049695510035100358602387401001010020200201003541111002110910100101000064044143994010000100101003610036100361003610036
10024100357506198632510010100101001088784149695510035100358602387401001010020200201003541111002110910100101000064044143994010000100101003610036100361003610036
1002410035750536986325100101001010010887840496955100351003586023874010010100202002010035411110021109101001010013064044134994010000100101003610036100361003610036
10024100357506698632510010100101001088784149695510035100358602387401001010020200201003541111002110910100101000064044143994010000100101003610036100361003610036
10024100357506198634610010100101001088784049695510035100358602387401001010020200201003541111002110910100101000064044134994010000100101003610036100361003610036
10024100357515061986325100101001010010887840496955100351003586023874010010100202002010035411110021109101001010014064034144994010000100101003610036100361003610036
100241003575061986325100101001010010887841496955100351003586023874010010100202002010035411110021109101001010011064034144994010000100101003610036100361003610036

Test 3: Latency 1->3

Code:

  sub w0, w1, w0
  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)181e3a3f4d51schedule 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)accfd0d5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? int retires (ef)f5f6f7f8fd
1020410035750000439987725101001010010100886641496955100351003585803872210100102002020010035411110201100991001010010000710013711994110000101001003610036100361003610036
1020410035750000752987725101001010010100886640496955100351003585803872210100102002020010035411110201100991001010010000710113711994110000101001003610036100361003610036
102041003575001980616987725101001010010100886640496955100351003585803872210100102002020010035411110201100991001010010000710023711994110000101001003610036100361003610036
1020410035750000201987725101001010010100886641496955100351003585803872210100102002020010035411110201100991001010010000710013711994110000101001003610036100361003610036
102041003575000061987725101001010010100886641496955100351003585803872210100102002020010035411110201100991001010010000710013711994110000101001003610036100361003610036
1020410035750000361987725101001010010100886640496955100351003585803872210100102002020010035411110201100991001010010000710013711994110000101001003610036100361003610036
1020410035750000254987725101001010010100886640496955100351003585803872210100102002020010035411110201100991001010010000710013711994110000101001003610036100361003610036
1020410035750000165987725101001010010100886640496955100351003585803872210100102002020010035411110201100991001010010000710013711994110000101001003610036100361003610036
1020410035750000141987725101001010010100886640496955100351003585803872210100102002020010035411110201100991001010010000710013711994110000101001003610036100361003610036
1020410035750000198987725101001010010100886640496955100351003585803872210100102002020010035411110201100991001010010000710014511994110000101001003610036100361003610036

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)acbranch cond mispred nonspec (c5)cfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? int retires (ef)f5f6f7f8fd
10024100357506198632510010100101001088784149695510035100358602387401001010020200201003541111002110910100101000064024122994010000100101003610036100361003610036
10024100357514761986325100101001010010887840496955100351003586023874010010100202002010035411110021109101001010170064024122994010000100101003610036100361003610036
1002410035751326198632510010100101001088784049695510035100358602387401001010020200201003541111002110910100101000064024122994010000100101003610036100361003610036
10024100357506198632510010100101001088784049695510035100358602387401001010020200201003541111002110910100101000064024122994010000100101003610036100361003610036
10024100357506198632510010100101001088784049695510035100358602387401001010020200201003541111002110910100101000064024122994010000100101003610036100361003610036
100241003575061986325100101001010010887840496955100351003586023874010010100202002010035411110021109101001010233064024122994010000100101003610036100361003610036
100241003575061986325100101001010010887841496955100351003586023874010010100202002010035411110021109101001010163064024122994010000100101003610036100361003610036
10024100357506198632510010100101001088784149695510035100358602387401001010020200201003541111002110910100101000064024122994010000100101003610036100361003610036
10024100357506198632510010100101001088784149695510035100358602387401001010020200201003541111002110910100101000064024122994010000100101003610036100361003610036
1002410035750619863251001010010100108878414969551003510035860238740100101002020020100354111100211091010010100111064024122994010000100101003610036100361003610036

Test 4: throughput

Count: 8

Code:

  sub w0, w8, w9
  sub w1, w8, w9
  sub w2, w8, w9
  sub w3, w8, w9
  sub w4, w8, w9
  sub w5, w8, w9
  sub w6, w8, w9
  sub w7, w8, w9
  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)03191e1f3f51schedule 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)l1d cache writeback (a8)accfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? int retires (ef)f5f6f7f8fd
802041339010000056258010080100801004005004910306133861338633233334180100802001602001338639118020110099100801001000005110219111338380000801001338713387133871338713387
8020413386101000484258010080100801004005004910306133861338633233334180100802001602001338639118020110099100801001000005110119111338380000801001338713387133871338713387
802041338610000035258010080100801004005004910306133861338633233334180100802001602001338639118020110099100801001000035110119111338380000801001347213387133871338713387
802041338610100035258010080100801004005004910306133861338633233334180100802001602001338639118020110099100801001000005110119211338380000801001338713387133871338713387
802041338610000035258010080100801004005004910306133861338633233334180100802001602001338639118020110099100801001000005110119111338380000801001338713387133871338713387
802041338610000077258010080100801004005004910306133861338633233334180100802001602001338639118020110099100801001000005110119111338380000801001338713387133871338713387
8020413386100330035258010080100801004005004910306133861338633233334180100802001602001338639118020110099100801001000005110119111338380000801001338713387133871338713387
802041338610000098258010080100801004005004910306133861338633233334180100802001602001338639118020110099100801001000005110119111338380000801001338713387133871338713387
8020413386100000172258010080100801004005004910306133861338633233334180100802001602001338639118020110099100801001000005110119211338380000801001338713387133871338713387
802041338610000056258010080100801004005004910306133861338633233334180100802001602001338639118020110099100801001000005110119111338380000801001338713387133871338713387

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)mmu table walk data (08)181e3f51schedule 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 cond mispred nonspec (c5)cfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? int retires (ef)f5f6f7f8fd
80024133871000000352580010800108001040005014910291133711337133303334880010800201600201337139118002110910800101001805020819551336880000800101337213372133721337213372
8002413371101000035258001080010800104000501491029113371133713330333488001080020160020133713911800211091080010100005020419451336880000800101337213372133721337213372
8002413371100000035258001080010800104000501491029113371133713330333488001080020160020133713911800211091080010100005020519551336880000800101337213372133721337213372
80024133711000000130258001080010800104006911491029113371133713330333488001080020160020133713911800211091080010100005020519541336880000800101337213372133721337213372
8002413371100001035258001080010800104000501491029113371133713330333488001080020160020133713911800211091080010100005020519451336880000800101337213372133721337213372
8002413371100000035258001080010800104000501491029113371133713330333488001080020160020133713911800211091080010100005020519541336880000800101337213372133721337213372
80024133711000000352580010800108001040005014910291133711337133303334880010800201600201337139118002110910800101001805020519551336880000800101337213372133721337213372
8002413371100000035258001080010800104000501491029113371133713330333488001080020160020133713911800211091080010100005020519551336880000800101337213372133721337213372
8002413371100000035258001080010800104000501491029113371133713330333488001080020160020133713911800211091080010100005020419451336880000800101337213372133721337213372
8002413371100000035258001080010800104000501491029113371133713330333488001080020160020133713911800211091080010100005020419451336880000800101337213372133721337213372