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

UMULL2 (by element, 4S)

Test 1: uops

Code:

  umull2 v0.4s, v0.8h, v1.h[1]
  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)1e3a3f4e51schedule 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 cache writeback (a8)acc2cfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)f5f6f7f8fd
100430372300282254825100010001000398313030183037303724153289510001000200030373037111001100000077416442630100030383038303830383038
100430372310282254825100010001000398313030183037303724153289510001000200030373037111001100000077416442630100030383038303830383038
100430372310282254825100010001000398313130183037303724153289510001000200030373037111001100003077416442630100030383038303830383038
100430372210282254825100010001000398313030183037303724153289510001000200030373037111001100000077416442630100030383038303830383038
100430372310282254825100010001000398313030183037303724153289510001000200030373037111001100000477416442630100030383038303830383038
100430372210282254825100010001000398313030183037303724153289510001000200030373037111001100030077416442630100030383038303830383038
100430372200282254825100010001000398313030183037303724153289510001000200030373037111001100020077416442630100030383038303830383038
100430372210282254825100010001000398313030183037303724153289510001000200030373037111001100000077416442630100030383038303830383038
100430372210282254825100010001000398313030183037303724153289510001000200030373037111001100000077416442630100030383038303830383038
100430372310282254825100010001000398313030183037303724153289510001000200030373037111001100000077416442630100030383038303830383038

Test 2: Latency 1->2

Code:

  umull2 v0.4s, v0.8h, v1.h[1]
  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)03mmu table walk data (08)l2 tlb miss data (0b)191e3f4e51schedule 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)9fld unit uop (a6)st unit uop (a7)l1d cache writeback (a8)acc2cfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? simd retires (ee)? int retires (ef)f5f6f7f8fd
10204300372250008761295482510100100100001001000050042773131300183003730037282653287451010020010000200200003003730037111020110099100100100001000000071011611296340100001003003830038300383003830038
10204300372250000612954825101251001000010010000500427731313001830037300372826532874510100200100002002000030037300371110201100991001001000010020475071011611296340100001003003830038300383003830038
1020430037224000061295482510125100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000010071011611296340100001003003830038300383003830038
1020430037225000061295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000060071011611296340100001003003830038300383003830038
1020430037224000061295482510125100100001001000050042773131300183003730037282653287451010020010000200200003003730037111020110099100100100001000000071011611296340100001003003830038300383003830038
1020430037225000061295482510125100100001001000050042773131300183003730037282653287451010020010000200200003003730037111020110099100100100001000010071011611296340100001003003830038300383003830038
10204300372250000612954825101001001000010010000500427731303001830037300372826532874510100200100002002000030037300371110201100991001001000010021230710116112963425100001003003830038300383003830038
1020430037225000061295482510125100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000010071011611296340100001003003830038300383003830038
10204300372250000103295482510100100100001001000050042773130300183003730037282653287451026020010000200200003003730037111020110099100100100001000023071011611296340100001003003830038300383003830087
1020430037225000061295482510100100100001251000062642773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000019071011611296340100001003003830038300383003830038

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)696d6emap stall dispatch (70)simd prf full (72)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)9fld unit uop (a6)l1d cache writeback (a8)a9accfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)? int retires (ef)f5f6f7f8fd
1002430037225061295482510010101000010100005042773133001830037300372828703287671001020100002020000300373003711100211091010100001004015640216222963010000103003830038300383003830038
100243003722506129548251001010100001010000504277313300183003730037282870328767100102010000202000030037300371110021109101010000100200640216222963010000103003830038300383003830038
100243003722506129548251001010100001010000504277313300183003730037282870328767100102010000202000030037300371110021109101010000100000640216222963010000103003830038300383003830038
100243003722506129548251001010100001010000504277313300183003730037282870328767100102010000202000030037300371110021109101010000100000640216222963010000103003830038300383003830038
100243003722506129548251001010100001010000504277313300183003730037282870328767100102010000202000030037300371110021109101010000100000640216222963010000103003830038300383003830038
100243003722505362954825100101010000101000050427731330018300373003728287032876710010201000020200003003730037111002110910101000010000141640216222963010000103003830038300383003830038
100243003722506129548251001010100001010000504277313300183003730037282870328767100102010000202000030037300371110021109101010000100003640216222963010000103003830038300383003830038
10024300372250126929548251001010100001010000504277313300183003730037282870328767100102010000202000030037300371110021109101010000100100640216222963010000103003830038300383003830038
100243003722506129548251001010100001010000504277313300183003730037282870328767100102010000202000030037300371110021109101010000100000640216222963010000103003830038300383003830038
100243003722506129548251001010100001010000504277313300183003730037282870328767100102010000202000030037300371110021109101010000100000640216222963010000103003830038300383003830038

Test 3: Latency 1->3

Code:

  umull2 v0.4s, v1.8h, v0.h[1]
  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)03mmu table walk data (08)09l2 tlb miss data (0b)18191e1f3f4e51schedule 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)696d6emap 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)st unit uop (a7)l1d cache writeback (a8)a9acc2cfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)ec? simd retires (ee)? int retires (ef)f5f6f7f8fd
10204300372250010021061295482510100100100001001000050042773133001830037300372826572874510100200100002002000030037300371110201100991001001000010000000000710116112963400100001003003830038300383003830038
1020430037224000000061295482510100100100001001000050042773133001830037300372826532874510100200100002002000030037300371110201100991001001000010000000000710116112963400100001003003830038300383003830038
1020430037225000000061295482510100100100001001000050042773133001830037300372826532874510100200100002002000030037300371110201100991001001000010000000000710116112963400100001003003830038300383003830038
10204300372250000000822954825101001001000010010000500427731330018300373003728265328745101002001000020020000300373008611102011009910010010000100000028060710119112963400100001003003830038300383003830038
1020530037225000000061295482510100100100001001000050042773133001830037300372826532874510100200100002002000030037300371110201100991001001000010000000000710116112963400100001003003830038300383003830038
1020430037225000000061295482510100100100001001000050042773133001830037300372826532874510100200100002002000030037300371110201100991001001000010000000000710116112963400100001003003830038300383003830038
1020430037225000000061295482510100100100001001000050042773133001830037300372826532874510100200100002002000030037300371110201100991001001000010000000000710116112963400100001003003830038300383003830038
1020430037225000000061295482510100100100001001000050042773133001830037300372826532874510100200100002002000030037300371110201100991001001000010000000000710116112963400100001003003830038300383003830038
1020430037225000000061295482510100100100001001000050042773133001830037300372826532874510100200100002002000030037300371110201100991001001000010000000000710116112963400100001003003830038300383003830038
10204300372240000042061295482510100100100001001000050042773133001830037300372826532874510100200100002002000030037300371110201100991001001000010000000000710116112963400100001003003830038300383003830038

1000 unrolls and 10 iterations

Result (median cycles for code): 3.0037

retire uop (01)cycle (02)03l2 tlb miss data (0b)1e3f4e51schedule 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)l1d cache writeback (a8)acc2branch mispred nonspec (cb)cfd5map dispatch bubble (d6)ddfetch restart (de)e0ea? simd retires (ee)? int retires (ef)f5f6f7f8fd
100243003722500612954825100101010000101000050427731313001830037300372828732876710010201000020200003003730037111002110910101000010000006404164429630010000103003830038300383003830038
100243003722500612954825100101010000101000050427731313001830037300372828732876710010201000020200003003730037111002110910101000010000006406165629630010000103003830038300383003830038
100243003722500612954825100101010000101000050427731313001830037300372828732876710010201000020200003003730037111002110910101000010013006406166629630010000103003830038300383003830038
100243003722500612954825100101010000101000050427731313001830037300372828732876710010201000020200003003730037111002110910101000010000006406166629630010000103003830038300383003830038
100243003722500612954825100101010000101000050427731313001830037300372828732876710010201000020200003003730037111002110910101000010000006406166629630010000103003830038300383003830038
1002430037225006062954825100101010000101000050427731313001830037300372828732876710010201000020200003003730037111002110910101000010000006405166629630010000103003830038300383003830038
100243003722500612954825100101010000101000050427731313001830037300372828732876710010201000020200003003730037111002110910101000010000006405165629630010000103003830038300383003830038
100243003722500612954825100101010000101000050427731313001830037300372828732876710010201000020200003003730037111002110910101000010209006406166529630010000103003830038300383003830038
100243003722500612954836100101010000101000050427731313001830037300372828732876710010201000020200003003730037111002110910101000010000006405165629630010000103003830038300383003830038
100243003722500612954825100101010000101000050427731313001830037300372828732876710010201000020200003003730037111002110910101000010000006404165529630010000103003830038300383003830038

Test 4: throughput

Count: 8

Code:

  umull2 v0.4s, v8.8h, v9.h[1]
  umull2 v1.4s, v8.8h, v9.h[1]
  umull2 v2.4s, v8.8h, v9.h[1]
  umull2 v3.4s, v8.8h, v9.h[1]
  umull2 v4.4s, v8.8h, v9.h[1]
  umull2 v5.4s, v8.8h, v9.h[1]
  umull2 v6.4s, v8.8h, v9.h[1]
  umull2 v7.4s, v8.8h, v9.h[1]
  movi v8.16b, 9
  movi v9.16b, 10

(fused SUBS/B.cc loop)

100 unrolls and 100 iterations

Result (median cycles for code divided by count): 0.2505

retire uop (01)cycle (02)03mmu table walk data (08)1e3f5051schedule 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)accfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? simd retires (ee)? int retires (ef)f5f6f7f8fd
802042006015000421200232580100100800001008000050064000012002020039200399973399978010020080000200160000200392003911802011009910010080000100000120511021611200360800001002004020040200402004020040
802042003915000410258010010080000100800005006400001200202003920039997339997801002008000020016000020039200391180201100991001008000010000000511011611200360800001002004020040200402004020040
8020420039150004102580100100800001008000050064000012002020039200399973399978010020080000200160000200392003911802011009910010080000100000093511011611200360800001002004020040200402004020040
802042003915000410258010010080000100800005006400001200202003920039997339997801002008000020016000020039200391180201100991001008000010000000511011611200360800001002004020040200402004020040
802042003915000410258010010080000100800005006400001200202003920039997339997801002008000020016000020039200391180201100991001008000010000090511011611200360800001002004020040200402004020040
802042003915000410258010010080000100800005006400001200202003920039997339997801002008000020016000020039200391180201100991001008000010000000511011611200360800001002004020040200402004020040
802042003915000410258010010080000100800005006400001200202003920039997339997801002008000020016000020039200391180201100991001008000010000000511011611200360800001002004020040200402004020040
802042003915000410258010010080000100800005006400001200702003920039997339997801002008000020016000020039200391180201100991001008000010000000511011611200360800001002004020040200402004020040
802042003915000410258010010080000100800005006400001200202003920039997339997801002008000020016000020039200391180201100991001008000010000000511011611200360800001002004020040200402004020040
802042003915000410258010010080000100800005006400001200202003920039997339997801002008000020016000020039200391180201100991001008000010000010511011611200360800001002004020040200402004020040

1000 unrolls and 10 iterations

Result (median cycles for code divided by count): 0.2505

retire uop (01)cycle (02)03mmu table walk data (08)181e3f51schedule 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)ld unit uop (a6)l1d cache writeback (a8)acbranch cond mispred nonspec (c5)cfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)? int retires (ef)f5f6f7f8fd
80024200481500004025800101080000108000050640000120020200392003999963100198001020800002016000020039200391180021109101080000100000050208161272003680000102004020040200402004020040
80024200391500004025800101080000108000050640000020020200392003999963100198001020800002016000020039200391180021109101080000100000050207165122003680000102004020040200402004020040
800242003915000040258001010800001080000506400001200202003920039999631001980010208000020160000200392003911800211091010800001000000502012165122003680000102004020040200402004020040
800242003915000040258001010800001080000506400001200202003920039999631001980010208000020160000200392003911800211091010800001000000502011165122003680000102004020040200402004020040
8002420039150000402580010108000010800005064000012002020039200399996310019800102080000201600002003920039118002110910108000010001305020416562003680000102004020040200402004020040
800242003915010040258001010800001080000506400000200202003920039999631001980010208000020160000200392003911800211091010800001000000502011164102003680000102004020040200402004020040
8002420039150000402580010108000010800005064000012002020039200399996310019800102080000201600002003920039118002110910108000010000005020516652003680000102004020040200402004020040
80024200391500004025800101080000108000050640000020020200392003999963100198001020800002016000020039200391180021109101080000100000050204165112003680000102004020040200402004020040
800242003915000092225800101080000108000050640000020020200392003999963100198001020800002016000020039200391180021109101080000100000050201116452003680000102004020040200402004020040
80024200391500004025800101080000108000050640000020020200392003999963100198001020800002016000020039200391180021109101080000100000050209165112003680000102004020040200402004020040