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

USRA (vector, 8H)

Test 1: uops

Code:

  usra v0.8h, v1.8h, #3
  movi v0.16b, 1
  movi v1.16b, 2

(no loop instructions)

1000 unrolls and 1 iteration

Retires: 1.000

Issues: 1.000

Integer unit issues: 0.000

Load/store unit issues: 0.000

SIMD/FP unit issues: 1.000

retire uop (01)cycle (02)03l1i tlb fill (04)mmu table walk data (08)09l2 tlb miss data (0b)18191e1f3a3f4e51schedule uop (52)schedule simd uop (54)dispatch simd uop (57)ldst uops in schedulers (5b)60696d6emap stall dispatch (70)map rewind (75)map stall (76)dispatch uop (78)map simd uop (7e)map simd uop inputs (81)8283flush restart other nonspec (84)85inst all (8c)inst simd alu (9a)l1d tlb miss (a1)ld unit uop (a6)l1d cache writeback (a8)a9acc2cfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)f5f6f7f8fd
100430372300000000282254825100010001000398313030183037303724153289510001000200030373037111001100000000077416442630100030383038303830383038
100430372410000000282254825100010001000398313030183037303724153289510001000200030373037111001100000000077416442630100030383038303830383038
100430372310000000282254825100010001000398313030183037303724153289510001000200030373037111001100000000077416442630100030383038303830383038
100430372410000000282254825100010001000398313030183037303724153289510001000200030373037111001100000000077416442630100030383038303830383038
100430372310000000282254825100010001000398313030183037303724153289510001000200030373037111001100000000077416442630100030383038303830383038
100430372410000000282254825100010001000398313030183037303724153289510001000200030373037111001100000000077416442630100030383038303830383038
100430372410000000282254825100010001000398313030183037303724153289510001000200030373037111001100000000077416442630100030383038303830383038
1004303723100000002822548251000100010003983130301830373037241532895100010002000303730371110011000000084077416442630100030383038303830383038
1004303723100000002124254825100010001000398313030183037303724153289510001000200030373037111001100000000077416442630100030383038303830383038
1004303724100000002822548251000100010003983130301830373037241532895100010002000303730371110011000001063077416442630100030383038303830383038

Test 2: Latency 1->1

Code:

  usra v0.8h, v1.8h, #3
  movi v0.16b, 1
  movi v1.16b, 2

(fused SUBS/B.cc loop)

100 unrolls and 100 iterations

Result (median cycles for code): 3.0037

retire uop (01)cycle (02)03191e3f4e51schedule uop (52)schedule int uop (53)schedule simd uop (54)dispatch int uop (56)dispatch simd uop (57)int uops in schedulers (59)ldst uops in schedulers (5b)60696d6emap stall dispatch (70)map rewind (75)map stall (76)dispatch uop (78)map int uop (7c)map simd uop (7e)map int uop inputs (7f)map simd uop inputs (81)8283flush restart other nonspec (84)85inst all (8c)inst branch (8d)inst branch taken (90)inst branch cond (94)inst int alu (97)inst simd alu (9a)9fl1d cache writeback (a8)a9accdcfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? simd retires (ee)? int retires (ef)f5f6f7f8fd
1020430037241006129548251010010010000100100005004277313130018300373003728265328745101002001000020020000300373003711102011009910010010000100100071011611296340100001003003830038300383003830038
1020430037232006129548251010010010000100100005004277313030018300373003728265328745101002001000020020000300373003711102021009910010010000100000071011611296340100001003003830038300383003830038
10204300372320025329548251010010010000100100005004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100000071011611296340100001003003830038300383003830038
1020430037233008929548251010010010000100100005004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100000071011612296340100001003003830038300383003830038
102043003723201211729548251010010010000100100005004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100000071011611296340100001003003830038300383003830038
1020430037233006129548251010010010000100100005004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100000071011611296340100001003003830038300383003830038
1020430037233006129548251010010010000100100005004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100000071011611296340100001003003830038300383003830038
10204300372330061295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000000710116112963417100001003003830038300383003830038
1020430037233006129548251012510010000100100005004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100000071011611296340100001003003830038300383003830038
1020430037233006129548251010010010000100100005004277313030018300373003728265328764101002001000020020000300373003711102011009910010010000100000071011611296340100001003003830038300383003830038

1000 unrolls and 10 iterations

Result (median cycles for code): 3.0037

retire uop (01)cycle (02)031e3f4e51schedule uop (52)schedule int uop (53)schedule simd uop (54)dispatch int uop (56)dispatch simd uop (57)int uops in schedulers (59)ldst uops in schedulers (5b)60696d6emap stall dispatch (70)map rewind (75)map stall (76)dispatch uop (78)map int uop (7c)map simd uop (7e)map int uop inputs (7f)map simd uop inputs (81)8283flush restart other nonspec (84)85inst all (8c)inst branch (8d)inst branch taken (90)inst branch cond (94)inst int alu (97)inst simd alu (9a)9fl1d cache writeback (a8)accfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)? int retires (ef)f5f6f7f8fd
1002430037232061295482510010101000010100005042773130300183003730037282873287671001020100002020000300373003711100211091010100001000640216222963010000103003830038300383003830038
1002430037233061295482510010101000010100005042773130300183003730037282873287671001020100002020000300373003711100211091010100001000640216222963010000103003830038300383003830038
1002430037233061295482510010101000010100005042773131300183003730037282873287671001020100002020998300373003711100211091010100001000640216222963010000103003830038300383003830038
1002430037233061295482510010101000010100005042773131300183003730037282873287671001020100002020000300373003711100211091010100001000640216222963010000103003830038300383003830038
1002430037245061295482510010101000010100005042773130300183003730037282873287671001020100002020000300373003711100211091010100001006640216222963010000103003830038300383003830038
100243003723306129548251001010100001010000504277313030018300373003728287328767100102010000202000030037300371110021109101010000104815640216222963010000103003830038300383003830038
1002430037233061295482510010101000010100005042773130300183003730037282873287671001020100002020000300373003711100211091010100001003640216222963010000103003830038300383003830038
10024300372320103295482510010101000010100005042773130300183003730037282873287671001020100002021334300373003711100211091010100001000640216222963010000103003830038300383003830038
1002430037233061295482510010101000010100005042773130300183003730037282873287671001020100002020000300373003711100211091010100001000640216222963010000103003830038300383003830038
1002430037233061295482510010101000010100005042773130300183003730037282873287671001020100002020000300373003711100211091010100001000640216222963010000103003830038300383003830038

Test 3: Latency 1->2

Code:

  usra v0.8h, v0.8h, #3
  movi v0.16b, 1

(fused SUBS/B.cc loop)

100 unrolls and 100 iterations

Result (median cycles for code): 3.0037

retire uop (01)cycle (02)03mmu table walk data (08)l2 tlb miss data (0b)1e1f3a3f4e51schedule uop (52)schedule int uop (53)schedule simd uop (54)dispatch int uop (56)dispatch simd uop (57)int uops in schedulers (59)ldst uops in schedulers (5b)60696d6emap stall dispatch (70)map rewind (75)map stall (76)dispatch uop (78)map int uop (7c)map simd uop (7e)map int uop inputs (7f)map simd uop inputs (81)8283flush restart other nonspec (84)85inst all (8c)inst branch (8d)inst branch taken (90)inst branch cond (94)inst int alu (97)inst simd alu (9a)9fl1d tlb miss (a1)ld unit uop (a6)l1d cache writeback (a8)acc2branch cond mispred nonspec (c5)branch mispred nonspec (cb)cdcfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? simd retires (ee)? int retires (ef)f5f6f7f8fd
10204300372330000061295472510100100100001001000050042771601300183003730037282716287411010020010008200200163003730037211020110099100100100001000000211171711600296460100001003003830038300863003830038
10204300372330000061295472510112100100161001000050042771601300183003730037282756287411025420010008200200163008630037111020110099100100100001000000011171701600296460100001003008530038300383003830038
1020430037233000880612954725101001001000010010000500427716013005430037300372827111287411010020010008200203583003730037111020110099100100100001004000011171801600296460100001003003830038300383003830038
1020430037233001320061295472510100100100001001000050042771601300183003730037282711228741101002001000820020348300373003711102011009910010010000100000220011171701600296450100001003003830038300383003830038
10204300372330000061295472510100100100001001000050042771601300183003730037282716287401010020010008200200163003730037211020110099100100100001000003011171802400296840100001003008630038300383003830038
102043003723200900124295472510100100100001001000050042771601300903003730037282716287401010020010008200200163003730037111020110099100100100001000003011171701600296460100001003003830038300383003830038
1020430037232000001856295472510100100100001001000050042771601300183017930037282716287411010020010008200200163003730037111020110099100100100001000000011171701600296450100001003003830038300383003830038
102043003723300000699295472510100100100001001000050042771601300183003730037282716287411010020010008200200163003730037111020110099100100100001000000011171701600296450100001003003830038300383003830038
102043003723300120061295472510100100100001001000050042771601300183003730037282717287411010020010008200200163008630037111020110099100100100001000000011171802600296450100001003003830038300873003830038
10204300372330000061295472510100100100001001000050042771601300183003730037282717287411010020010008200200163003730037111020110099100100100001000005590011171701600296460100001003003830038300383003830038

1000 unrolls and 10 iterations

Result (median cycles for code): 3.0037

retire uop (01)cycle (02)031e1f3f4e51schedule uop (52)schedule int uop (53)schedule simd uop (54)dispatch int uop (56)dispatch simd uop (57)int uops in schedulers (59)ldst uops in schedulers (5b)60696b6d6emap stall dispatch (70)map rewind (75)map stall (76)dispatch uop (78)map int uop (7c)map simd uop (7e)map int uop inputs (7f)map simd uop inputs (81)8283flush restart other nonspec (84)85inst all (8c)inst branch (8d)inst branch taken (90)inst branch cond (94)inst int alu (97)inst simd alu (9a)9fl1d cache writeback (a8)a9accfd5map dispatch bubble (d6)ddfetch restart (de)e0eaec? simd retires (ee)? int retires (ef)f5f6f7f8fd
100243003723200612954725100101010000101000050427716003001803003730037282863287671001020100002020000300373003711100211091010100001000064021622296290010000103003830038300383003830038
100243003723300612954725100101010000101000050427716003001803003730037282863287671001020100002020000300373003711100211091010100001000064021622296290010000103003830038300383003830038
100243003723300612954725100101010000101000050427716013001803003730037282863287671001020100002020000300373003711100211091010100001000064021622296290010000103003830038300383003830038
1002430037233004002954725100101010000101000050428121613001803003730037282863287671001020100002020000300373003711100211091010100001000064021621296290010000103003830038300383003830038
100243003723200612954725100101010000101000050427716003001803003730037282867287671001020100002020000300373003711100211091010100001000064021622296292010000103003830038300383003830038
100243003723300612954725100101010000101000050427716003001803003730037282863287671001020100002020000300373003711100211091010100001000064021622296290010000103003830038300383003830038
100243003723200612954725100101010000101000050427716013001803003730037282863287671001020100002020000300373003711100211091010100001010064021622296290010000103003830038300383003830038
1002430037233180612954725100101010000101000050427716003001803003730037282863287671001020100002020000300373003711100211091010100001000064021622296290010000103003830038300383003830038
100243003723300612954725100101010000101000050427716003001803003730037282863287671001020100002020000300373003711100211091010100001000064021622296290010000103003830038300383003830038
100243003723300612954725100101010000101000050427716003001803003730037282863287671001020100002020000300373003711100211091010100001000064021622296290010000103003830038300383003830038

Test 4: throughput

Count: 8

Code:

  movi v0.16b, 0
  usra v0.8h, v8.8h, #3
  movi v1.16b, 0
  usra v1.8h, v8.8h, #3
  movi v2.16b, 0
  usra v2.8h, v8.8h, #3
  movi v3.16b, 0
  usra v3.8h, v8.8h, #3
  movi v4.16b, 0
  usra v4.8h, v8.8h, #3
  movi v5.16b, 0
  usra v5.8h, v8.8h, #3
  movi v6.16b, 0
  usra v6.8h, v8.8h, #3
  movi v7.16b, 0
  usra v7.8h, v8.8h, #3
  movi v8.16b, 9

(fused SUBS/B.cc loop)

100 unrolls and 100 iterations

Result (median cycles for code divided by count): 0.2509

retire uop (01)cycle (02)031e3f51schedule uop (52)schedule int uop (53)schedule simd uop (54)dispatch int uop (56)dispatch simd uop (57)int uops in schedulers (59)ldst uops in schedulers (5b)60696d6emap rewind (75)map stall (76)dispatch uop (78)map int uop (7c)map simd uop (7e)map int uop inputs (7f)map simd uop inputs (81)8283flush restart other nonspec (84)85inst all (8c)inst branch (8d)inst branch taken (90)inst branch cond (94)inst int alu (97)inst simd alu (9a)9fl1d cache writeback (a8)acbranch cond mispred nonspec (c5)branch mispred nonspec (cb)cdcfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)? int retires (ef)f5f6f7f8fd
160204200651550712580116100800161008002850064019602004520065200656128012820080028200160056200652006511160201100991001001600001000751111011901600200621600001002006620066200662006620066
160204200651550292580116100800161008002850064019602004520065200656128012820080028200160056200652006511160201100991001001600001000751111011901600200621600001002006620066200662006620066
16020420065155029258011610080016100800285006401960200452006520065612801282008002820016005620065200651116020110099100100160000100001111017101600200621600001002006620066200662006620066
1602042006515602925801161008001610080028500640196020045200652006561280128200800282001600562006520065111602011009910010016000010001711111011901600200621600001002006620066200662006620066
160204200651560292580116100800161008002850064019602004520065200656128012820080028200160056200652006511160201100991001001600001000631111011901600200621600001002006620066200662006620066
160204200651560292580116100800161008002850064019602004520065200656128012820080028200160056200652006511160201100991001001600001001781111011901600200621600001002006620066200662006620066
16020420065156029258011610080016100800285006401960200452006520065612801282008002820016005620065200651116020110099100100160000100001111011901600200621600001002006620066200662006620066
16020420065155029258011610080016100800285006401960200452006520065612801282008002820016005620065200651116020110099100100160000100001111011901600200621600001002006620066200662006620066
16020420065155029258011610080016100800285006401960200452006520065612801282008002820016005620065200651116020110099100100160000100001111011901600200621600001002006620066200662006620066
1602042006515502925801161008001610080028500640196020045200652006561280128200800282001600562006520065111602011009910010016000010001051111011901600200621600001002006620066200662006620066

1000 unrolls and 10 iterations

Result (median cycles for code divided by count): 0.2506

retire uop (01)cycle (02)03mmu table walk instruction (07)mmu table walk data (08)09l2 tlb miss instruction (0a)l2 tlb miss data (0b)18191e1f3a3f51schedule uop (52)schedule int uop (53)schedule simd uop (54)dispatch int uop (56)dispatch simd uop (57)int uops in schedulers (59)ldst uops in schedulers (5b)5f6061696d6emap rewind (75)map stall (76)dispatch uop (78)map int uop (7c)map simd uop (7e)map int uop inputs (7f)map simd uop inputs (81)8283flush restart other nonspec (84)85inst all (8c)inst branch (8d)inst branch taken (90)inst branch cond (94)inst int alu (97)inst simd alu (9a)9fl1d tlb access (a0)l1d tlb miss (a1)l1d cache miss ld (a3)ld unit uop (a6)st unit uop (a7)l1d cache writeback (a8)a9acc2branch cond mispred nonspec (c5)cfd0d2l1i cache miss demand (d3)d5map dispatch bubble (d6)d9dadbddfetch restart (de)e0eaebec? simd retires (ee)? int retires (ef)f5f6f7f8fd
16002420054155200100000045258001010800001080000506400001152002720046200463228001020800002016000020046200461116002110910101600001000000000001003782114202111615200431500160000102004720047200472004720047
16002420046156400100000045258001010800001080000506400001152002720050200463228001020800002016000020046200461116002110910101600001000000000001003982117202111416200441500160000102004720047200472004720047
16002420046156100000030045258001010800801080000506400001152002720047200463228001020800002016000020046200461116002110910101600001000000000001003982116202111416200431500160000102004720047200472004720047
16002420046155200100000045258001010800001080000506400001152002720046200463228001020800002016000020046200461116002110910101600001000000000001004082114202111416200431500160000102004720047200472004720047
16002420046155100000000045258001010800001080000506400001152002720046200463228001020800002016000020046200471116002110910101600001000000000001003682115202111614200431500160000102004720047200472004720047
16002420046155000000000045258001010800001080000506400001152002920046200463228001020800002016000020046200461116002110910101600001000000000001003882115202111417200431500160000102004720047200472004720047
16002420046155000000030073258001010800001080000506400001152002720046200463228001020800002016000020046200461116002110910101600001000000000001003882116202111613200431500160000102004720047200482004720047
16002420046155000000000045258001010800001080000506400001152002820046200463228001020800002016000020046200461116002110910101600001000000000001003782114202111516200431500160000102004720047200472004720047
16002420046155000000000045258001010800001080000506400001152002720046200463228001020800002016000020046200461116002110910101600001000000000001003882115202111715200431500160000102004720047200472004720047
16002420046155000000000045258001010800001080000506400001152002720046200463228001020800002016000020046200461116002110910101600001000000000001003882114202111715200431500160000102004720047200472004720047

Test 5: throughput

Count: 16

Code:

  usra v0.8h, v16.8h, #3
  usra v1.8h, v16.8h, #3
  usra v2.8h, v16.8h, #3
  usra v3.8h, v16.8h, #3
  usra v4.8h, v16.8h, #3
  usra v5.8h, v16.8h, #3
  usra v6.8h, v16.8h, #3
  usra v7.8h, v16.8h, #3
  usra v8.8h, v16.8h, #3
  usra v9.8h, v16.8h, #3
  usra v10.8h, v16.8h, #3
  usra v11.8h, v16.8h, #3
  usra v12.8h, v16.8h, #3
  usra v13.8h, v16.8h, #3
  usra v14.8h, v16.8h, #3
  usra v15.8h, v16.8h, #3
  movi v16.16b, 17

(fused SUBS/B.cc loop)

100 unrolls and 100 iterations

Result (median cycles for code divided by count): 0.2502

retire uop (01)cycle (02)03mmu table walk data (08)18191e1f3a3f51schedule uop (52)schedule int uop (53)schedule simd uop (54)dispatch int uop (56)dispatch simd uop (57)int uops in schedulers (59)ldst uops in schedulers (5b)60696d6emap stall dispatch (70)map rewind (75)map stall (76)dispatch uop (78)map int uop (7c)map simd uop (7e)map int uop inputs (7f)map simd uop inputs (81)8283flush restart other nonspec (84)85inst all (8c)inst branch (8d)inst branch taken (90)inst branch cond (94)inst int alu (97)inst simd alu (9a)9fl1d tlb access (a0)l1d tlb miss (a1)ld unit uop (a6)l1d cache writeback (a8)a9acbranch cond mispred nonspec (c5)branch mispred nonspec (cb)cdcfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? simd retires (ee)? int retires (ef)f5f6f7f8fd
16020440039311000000302516010810016000810016002050012801321400204003940039199776199901601202001600322003200644003940039111602011009910010016000010000010011110118016004003601600001004004040040400404004040040
16020440039310000000302516010810016000810016002050012801320400204003940039199776199901601202001600322003200644003940039111602011009910010016000010000000011110118016004003601600001004004040040400404004040040
16020440039310000000722516010810016000810016002050012801320400204003940039199776199901601202001600322003200644003940039111602011009910010016000010000000011110118016114063901600001004057040872408234082740772
1602044082231611615211213201730232416119110316166710016174750012930261407064061940983201278020473161765200161689202323362406164081416116020110099100100160000100223008005222103512206114069511600001004097940870409344052240623
1602044092731501313106811440478217416147010416117110016132150012905161405514072740675200816320345160820200161322200322684407184070514116020110099100100160000100002043530111103422179324036601600001004071640727407174072840726
16020440689316081010625280642616011610016001610016002850012801960400294004840049199769199861601282001600382003200764004940048111602011009910010016000010000000022210128123114004601600001004004940049400494005040050
160204400483110000006426160116100160016100160028500128019604002940048400481997610199861601282001600382003200764004840048111602011009910010016000010000000022210128123114004501600001004005040050400504004940050
160204400483100000001592616011610016001610016002850012801960400294004840049199769199861601282001600382003200764004840048111602011009910010016000010000010022210145123114004501600001004004940049400494005040049
16020440048310000000642716011610016001610016002850012801960400294004940048199769199861601282001600382003200764004840048111602011009910010016000010000000022210129123114004501600001004005040049400494004940049
16020440048311000000642616011610016001610016002850012801960400294004940049199769199861601282001600382003200764004840049111602011009910010016000010000000022210128123114004501600001004005040050400504005040050

1000 unrolls and 10 iterations

Result (median cycles for code divided by count): 0.2502

retire uop (01)cycle (02)03mmu table walk instruction (07)1e3f51schedule uop (52)schedule int uop (53)schedule simd uop (54)dispatch int uop (56)dispatch simd uop (57)int uops in schedulers (59)ldst uops in schedulers (5b)5f60696d6emap stall dispatch (70)map rewind (75)map stall (76)dispatch uop (78)map int uop (7c)map simd uop (7e)map int uop inputs (7f)map simd uop inputs (81)8283flush restart other nonspec (84)85inst all (8c)inst branch (8d)inst branch taken (90)inst branch cond (94)inst int alu (97)inst simd alu (9a)9fl1d tlb access (a0)ld unit uop (a6)l1d cache writeback (a8)a9acb8c2branch cond mispred nonspec (c5)branch mispred nonspec (cb)cfd0d2l1i cache miss demand (d3)l1i tlb miss demand (d4)d5map dispatch bubble (d6)d9dadbddfetch restart (de)e0eaeb? simd retires (ee)? int retires (ef)f5f6f7f8fd
1600244005031110462516001010160000101600005012800001140020400394003919996320019160010201600002032000040039400391116002110910101600001000680000001002231102216211171740036206160000104004040040400404004040040
1600244003931000462516001010160000101600005012800001140020400394003919996320019160010201600002032000040039400391116002110910101600001000760000001002231101116111141740036206160000104004040040400404004040040
1600244003932210462516001010160000101600005012800000140020400394003919996320019160010201600002032000040039400391116002110910101600001000001200001002231101616211171740036155160000104004040040400404004040040
16002440039310007112516001010160388101600005012800001140020400394003919996320019160010201600002032000040039400391116002110910101600001000480000001002231101516111201440036155160000104004040040400404004040040
160024400393100279462516001010160000101600005012800001140020400394003919996320019160010201600002032000040039400391116002210910101600001000390000001002231101516111181640036155160000104004040040400404004040040
160024400393110067891600101016000010160000501280000114002040039400391999632001916001020160000203200004003940039111600211091010160000100080600001002231101516111171740036155160000104004040040400404004040040
16002440039310004032516001010160000101600005012800001140020400394003919996320019160010201600002032000040039400391116002110910101600001000620000001002231101416111191740036155160000104004040040400404004040040
1600244003931100462516001010160000101600005012800001140020400394003919996320019160010201600002032000040039400391116002110910101600001000360000001002231101616211201840036165160000104004040040400404004040040
1600244003931000462516001010160395101600005012800001140020400394003919996320019160010201600002032000040039400391116002110910101600001000001800001002231101816211161640036165160000104004040040400404004040040
160024400393100046251600101016000010160000501280000114002040039400391999632001916001020160000203200004003940039111600211091010160000100070300001002231101716211171640036155160000104004040040400404004040040