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 (sxtx, 64-bit)

Test 1: uops

Code:

  sub x0, x0, x1, sxtx
  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
10041035806186225100010001000169161103510357283868100010002000103541111001100000073141119371000100010361036103610361036
10041035806186225100010001000169161103510357283868100010002000103541111001100000073141119371000100010361036103610361036
10041035806186225100010001000169161103510357283868100010002000103541111001100001073141119371000100010361036103610361036
10041035706186225100010001000169161103510357283868100010002000103541111001100000073141119371000100010361036103610361036
100410358016886225100010001000169161103510357283868100010002000103541111001100000073141119371000100010361036103610361036
10041035806186225100010001000169161103510357283868100010002000103541111001100000073141119371000100010361036103610361036
10041035806186225100010001000169161103510357283868100010002000103541111001100003073141119371000100010361036103610361036
100410358014686225100010001000169161103510357283868100010002000103541111001100000073141119371000100010361036103610361036
10041035808286225100010001000169161103510357283868100010002000103541111001100001073141119371000100010361036103610361036
10041035806186225100010001000169161103510357283868100010002000103541111001100000073141119371000100010361036103610361036

Test 2: Latency 1->2

Code:

  sub x0, x0, x1, sxtx
  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)1e3f4d51schedule 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)cfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? int retires (ef)f5f6f7f8fd
10204100357501266198772510100101001010088664149695510035100358580387221010010200202001003541111020110099100101001000071013711994110000101001003610036100361003610036
102041003575006198772510100101001010088664149695510035100358580387221010010200202001003541111020110099100101001000071013711994110000101001003610036100361003610036
1020410035750023298772510100101001010088664149695510035100358580387221010010200202001003541111020110099100101001000071013711994110000101001003610036100361003610036
102041003575006198772510100101001010088664149695510035100358580387221010010200202001003541111020110099100101001000071013711994110000101001003610036100361003610036
102041003575106198772510100101001010088664149695510035100358580387221010010200202001003541111020110099100101001000071013711994110000101001003610036100361003610036
102041003575006198772510100101001010088664149695510035100358580387221010010200202001003541111020110099100101001000071013711994110000101001003610036100361003610036
1020410035750156198772510100101001010088664149695510035100358580387221010010200202001003541111020110099100101001000071013711994110000101001003610036100361003610036
102041003575006198772510100101001010088664149695510035100358580387221010010200202001003541111020110099100101001000071013711994110000101001003610036100361003610036
102041003575006198772510100101001010088664149695510035100358580387221010010200202001003541111020110099100101001000071013711994110000101001003610036100361003610036
1020410035750126198772510100101001010088664149695510035100358580387221010010200202001003541111020110099100101001000071013711994110000101001003610036100361003610036

1000 unrolls and 10 iterations

Result (median cycles for code): 1.0035

retire uop (01)cycle (02)03l2 tlb miss data (0b)1e1f3a3f4d51schedule 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)a9accfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? int retires (ef)f5f6f7f8fd
10024100357500001039863251001010010100108878449695510035100358602387401001010020200201003541111002110910100101000064024122994010000100101003610036100361003610036
1002410035750000619863251001010010100108878449695510035100358602387401001010020200201003541111002110910100101000064024122994010000100101003610036100361003610036
1002410035750000619863251001010010100108878449695510035100358602387401001010020200201003541111002110910100101010064024122994010000100101003610036100361003610036
1002410035760000619863251001010010100108878449695510035100358602387401001010020200201003541111002110910100101000064024122994010000100101003610036100361003610036
1002410035750000619863251001010010100108878449695510035100358602387401001010020200201003543111002110910100101000064024122994110000100101003610036100361003610036
1002410035750000619863251001010010100108878449695510035100358602387401001010020200201003541111002110910100101000064024122994010000100101003610036100361003610036
10024100357500001499863251001010010100108878449695510035100358602387401001010020200201003543111002110910100101000064024122994010000100101003610036100361003610036
1002410035750000619863251001010010100108878449695510035100358602387401001010020200201003541111002110910100101000064024122994010000100101003610036100361003610036
1002410035750000619863251001210010100108878449695510035100358602387401001010020200201003541111002110910100101000064024122994010000100101003610036100361003610036
1002410035750000619863251001010010100108878449695510035100358602387401001010020200201003541111002110910100101010064024122994010000100101003610036100361003610036

Test 3: Latency 1->3

Code:

  sub x0, x1, x0, sxtx
  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)1e3f4d51schedule 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
1020410035750661987725101001010010100886641496955100351003585803872210100102002020010035411110201100991001010010000071013711994110000101001003610036100361003610036
102041003575023461987725101001010010100886641496955100351003585803872210100102002020010035411110201100991001010010000071013711994110000101001003610036100361003610036
1020410035750061987725101001010010100886641496955100351003585803872210100102002020010035411110201100991001010010000071013711994110000101001003610036100361003610036
1020410035750061987725101001010010100886641496955100351003585803872210100102002020010035411110201100991001010010000071013711994110000101001003610036100361003610036
1020410035750061987725101001010010100886641496955100351003585803872210100102002020010035411110201100991001010010000071013711994110000101001003610036100361003610036
1020410035750061987725101001010010100886641496955100351003585803872210100102002020010035411110201100991001010010000071013711994110000101001003610036100361003610036
10204100357501261987725101001010010100886641496955100351003585803872210100102002020010035411110201100991001010010000071013711994110000101001003610036100361003610036
10204100357502161987725101001010010100886641496955100351003585803872210100102002020010035411110201100991001010010000071013711994110000101001003610036100361003610036
1020410035750061987725101001010010100886641496955100351003585803872210100102002020010035411110201100991001010010000071013711994110000101001003610036100361003610036
1020410035750961987725101001010010100886641496955100351003585803872210100102002020010035411110201100991001010010000071013711994110000101001003610036100361003610036

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)60696a6b6d6emap 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)ld unit uop (a6)l1d cache writeback (a8)accfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? int retires (ef)f5f6f7f8fd
1002410035750619863251001010010100108878414969550100351003586023874010010100202002010035411110021109101001010000064034122994010000100101003610036100361003610036
1002410035750619863251001010010100108878414969550100351003586023874010010100202002010035411110021109101001010000064024122994010000100101003610036100361003610036
1002410035750619863251001010010100108878414969550100351003586023874010010100202002010035411110021109101001010000064024122994010000100101003610036100361003610036
1002410035750619863251001010010100108878414969550100351003586023874010010100202002010035411110021109101001010000064024122994010000100101003610036100361003610036
1002410035750619863251001010010100108878404969550100351003586023874010010100202002010035411110021109101001010000064024122994010000100101003610036100361003610036
1002410035750619863251001010010100108878404969550100351003586023874010010100202002010035411110021109101001010200064024122994010000100101003610036100361003610036
1002410035750619863251001010010100108878414969550100351003586023874010010100202002010035411110021109101001010000064024122994010000100101003610036100361003610036
1002410035750619863251001010010100108878404969550100351003586023874010010100202002010035411110021109101001010000064024122994010000100101003610036100361003610036
1002410035750619863251001010010100108878414969550100351003586023874010010100202002010035411110021109101001010000064024122994010000100101003610036100361003610036
1002410035760619863251001010010100108878404969550100351003586023874010010100202002010171411110021109101001010000064024122994010000100101003610036100361003610036

Test 4: throughput

Count: 8

Code:

  sub x0, x8, x9, sxtx
  sub x1, x8, x9, sxtx
  sub x2, x8, x9, sxtx
  sub x3, x8, x9, sxtx
  sub x4, x8, x9, sxtx
  sub x5, x8, x9, sxtx
  sub x6, x8, x9, sxtx
  sub x7, x8, x9, sxtx
  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)031e3f51schedule 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)9fa9acc2cfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? int retires (ef)f5f6f7f8fd
802041341610039352580100801008010040050014910306133861338633233334180100802001602001338639118020110099100801001000005110219111338380000801001338713387133871338713387
802041338610018352580100801008010040050014910306133861338633233334180100802001602001338639118020110099100801001000005110119111338380000801001338713387133871338713387
80204133861000352580100801008010040050014910306133861338633233334180100802001602001338639118020110099100801001002305110119111338380000801001338713387133871338713387
80204133861000352580100801008010040050014910306133861338633233334180100802001602001338639118020110099100801001000005110119111338380000801001338713387133871338713387
80204133861000352580100801008010040050014910306133861338633233334180100802001602001338639118020110099100801001000005110119111338380000801001338713387133871338713387
802041338610003202580100801008010040050014910306133861338633233334180100802001602001338639118020110099100801001000005110119111338380000801001338713387133871338713387
80204133861000352580100801008010040050014910306133861338633233334180100802001602001338639118020110099100801001000005110119111338380000801001338713387133871338713387
802041338610024352580100801008010040050014910306133861338633233334180100802001602001338639118020110099100801001000005110119111338380000801001338713387133871338713387
80204133861000352580100801008010040050014910306133861338633233334180100802001602001338639118020110099100801001000005110119111338380000801001338713387133871338713387
80204133861000352580100801008010040050014910306133861338633233334180100802001602001338639118020110099100801001000005110119111338380000801001338713387133871338713387

1000 unrolls and 10 iterations

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

retire uop (01)cycle (02)031e3f51schedule 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)accfd0d5map dispatch bubble (d6)daddfetch restart (de)e0? int output thing (e9)eb? int retires (ef)f5f6f7f8fd
800241338810003525800108001080010400050491029113371133713330333488001080020160020133713911800211091080010100005024014190121213368800000800101337213372133721337213372
800241337110003525800108001080010400050491029113371133713330333488001080020160020133713911800211091080010100005024011190121213368800000800101337213372133721337213372
800241337110003525800108001080010409394491029115403133823330333488001080020160020133713911800211091080010100005025011190101213368800000800101337213372133721337213372
800241337110003525800108001080010400050491029113371133713330333488001080020160020133713911800211091080010100005026012190111313368800000800101337213372133721337213372
80024133711000352580010800108001040005049102911337113371382133348800108002016002013371391180021109108001010013502609190141413368800000800101337213372133721337213372
8002413371100020925800108001080010409394491029113371133713330333488001080020160020133713911800211091080010100205026012190131313419800000800101337213372134441337213372
80024133711000352580010800108001040005049102911337113371333033348800108002016002013371391180021109108001010000502401019010913368800000800101337213372133721337213372
80024133711000352580140800108001040005049102911337113442333033368800108002016002013433391180021109108001010210502608190131313368800000800101337213372133721337213372
800241337110003525800108001080010400050491029113371133713330333488001080020160020133713911800211091080010100005024011190121213368800000800101337213372133721337213372
8002413371100070025800108001080010400050491029113371133713330333488001080020160020133713911800211091080010100005027011190121213368800000800101337213372133721337213372