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

SQDMULL (by element, 4S)

Test 1: uops

Code:

  sqdmull v0.4s, v0.4h, 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)03181e3f4e51schedule uop (52)schedule simd uop (54)dispatch simd uop (57)ldst uops in schedulers (5b)60696d6emap stall dispatch (70)simd prf full (72)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)accfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)f5f6f7f8fd
10043037230061254825100010001000398313130183037303724150328951000100020003037303711100110000073316332630100030383038303830383038
10043037230061254825100010001000398313130183037303724150328951000100020003037303711100110002073316332630100030383038303830383038
10043037230061254825100010001000398313130183037303724150328951000100020003037303711100110000073316332630100030383038303830383038
10043037220061254825100010001000398313130183037303724150328951000100020003037303711100110000073316332630100030383038303830383086
10043037220061254825100010001000398313130183037303724150328951000100020003037303711100110000073316332630100030383038303830383038
10043037220061254825100010001000398313130183037303724150328951000100020003037303711100110000073316332630100030383038303830383038
100430372300200254825100010001000398313130183037303724150328951000100020003037303711100110000073316332630100030383038303830383038
100430372300307254825100010001000398313130183037303724150328951000100020003037303711100110000073316332630100030383038303830383038
10043037230061254825100010001000398313130183037303724150328951000100020003037303711100110000073316332630100030383038303830383038
100430372309061254825100010001000398313130183037303724150328951000100020003037303711100110001073316332630100030383038303830383038

Test 2: Latency 1->2

Code:

  sqdmull v0.4s, v0.4h, 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)0318191e3f4e51schedule 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)l1d cache writeback (a8)a9acc2cfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? simd retires (ee)? int retires (ef)f5f6f7f8fd
1020430037225000929295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000500071011611296340100001003003830038300383003830038
1020430228225000166295482510159107100161001000050042773131300183003730037282653287451010020010000200200003003730037111020110099100100100001000000071011611296340100001003003830038300383003830038
1020430037225000277295482510100100100001001000050042773131300183003730037282653287451010020010000200200003003730037111020110099100100100001000000271011611296340100001003003830038300383003830038
1020430037225000126295482510100100100001001000050042773131300183003730037282653287451010020010000200200003003730037111020110099100100100001000000071011611296340100001003003830038300383003830038
1020430037225000191295482510100100100001001000050042773131300183003730037282653287451010020010000200200003003730037111020110099100100100001000000071011611296340100001003003830038301343008630038
1020430037225000146295482510100100100001001000050042813490300183003730037282653287451010020010000200200003003730037111020110099100100100001000000071031611296340100001003003830038300383003830038
1020430037225000187295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000003071011611296340100001003003830038300383003830038
10204300372253101452954825101001001000010010000500427731313001830037300372826532874510100200100002002000030037300375110201100991001001000010001039071011611296340100001003003830038300383003830038
1020430037225000147295482510100100100001001000050042773131300183003730037282653287451010020010000206200003003730037111020110099100100100001002022780471011611296670100001003003830038300383008630038
1020430037226000147295484510100100100081001014950042786701300183003730037282653287451010020010000200200003003730037111020110099100100100001000003071011611296340100001003003830038300383003830038

1000 unrolls and 10 iterations

Result (median cycles for code): 3.0037

retire uop (01)cycle (02)03mmu table walk data (08)l2 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)696b6d6emap 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)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)? simd retires (ee)? int retires (ef)f5f6f7f8fd
10024300372250000006129548251001010100001010000504277313300180300373003728287032876710010201000020200003003730037111002110910101000010000000006403163329630010000103003830038300383003830038
10024300372240000006729548251001010100001010000504277313300180300373003728287032876710010201000020200003003730037111002110910101000010000000006403163329630010000103003830038300383003830038
100243003722500000040629548251001010100001010000504277313300180300373003728287032876710010201000020200003003730037111002110910101000010000000006403163329630010000103003830038300383003830038
10024300372250000008229548251001010100001010000504277313300180300373003728287032876710010201000020200003003730037111002110910101000010000000006403163329630010000103003830038300383003830038
10024300372250000008229548251001010100001010000504277313300183300373003728287032876710010201000020200003003730037111002110910101000010000000006403163329630410000103007930038300383003830038
10024300372250000008229548251001010100001010000504277313300180300373003728287032876710010201000020200003003730037111002110910101000010000000006403163329630010000103003830038300383003830038
100243003722500000010329548251001010100001010000504277313300180300373003728287032876710010201000020200003003730037111002110910101000010000000006403163329630010000103003830038300383003830038
10024300372250000008429548251001010100001010000504277313300180300373003728287732876710010201000020200003003730037111002110910101000010000000006403163329630010000103003830038300383003830038
100243003722400000017029548251001010100001010000504277313300180300373003728287032876710010201000020200003003730037111002110910101000010000000006403163329630010000103003830038300383003830038
10024300372250000008229548251001010100001010000504277313300180300373003728287032876710010201000020200003003730037111002110910101000010000000006403163329630010000103003830038300383003830038

Test 3: Latency 1->3

Code:

  sqdmull v0.4s, v1.4h, 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)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)accdcfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)? int retires (ef)f5f6f7f8fd
1020430037225061295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000007102161129634100001003003830038300383003830038
10204300372250124295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000007101161129634100001003003830038300383003830038
1020430037225061295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000007101161129634100001003003830038300383003830038
1020430037224061295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000007101161129634100001003003830038300383003830038
1020430037225089295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000007101161129634100001003003830038300383003830038
1020430037225061295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000007101161129634100001003003830038300383003830038
1020530037225061295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000007101161129634100001003003830038300383003830038
1020430037225061295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000007101161129634100001003003830038300383003830038
1020430037225061295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000007101161129634100001003003830038300383003830038
1020430037224061295482510100100100001021000050042773131300183003730037282653287451010020010000200200003003730037111020110099100100100001000007101161129634100001003003830038300383003830038

1000 unrolls and 10 iterations

Result (median cycles for code): 3.0037

retire uop (01)cycle (02)03mmu table walk data (08)l2 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)60696d6emap 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)9fl1d 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)? simd retires (ee)? int retires (ef)f5f6f7f8fd
1002430037225000000842954825100101010000101000050427731313001830037300372828703287671001020100002020000300373003711100211091010100001000000006403163329630010000103003830038300383003830038
10024300372250000001832954825100101010000101000050427731313001830037300372828703287671001020100002020000300373003721100211091010100001000000006403163329630010000103003830038300383003830038
10024300372250000007262954825100101010000101000050427731313001830037300372828703287671001020100002020000300373003711100211091010100001000000006403163329630010000103003830038300383003830038
10024300372250000001562954825100101010000101000050427731313001830037300372828703287671001020100002020344300373003711100211091010100001000000006403163329630010000103003830038300383003830038
1002430037225000000612954825100101010000101000050427731313001830037300372828703287671001020100002020000300373003711100211091010100001000010306403163329630010000103003830038300383003830038
1002430037225000000612954825100101010000101000050427731303001830037300372828703287671001020100002020000300373003711100211091010100001000000006403163329630010000103003830038300383003830038
1002430037225000000612954825100101010000101000050427731303001830037300372828703287671001020100002020000300373003711100211091010100001000000006403163329630010000103003830038300383003830038
100243003722500000108612954825100101010000101000050427731303001830037300372828703287671001020100002020000300373003711100211091010100001000000006403163329700010000103003830038300383003830038
1002430037225000000612954825100101010000101000050427731313001830037300372828703287671001020100002020000300373003711100211091010100001000000006403163329630010000103003830038300383003830083
10024300372250000001472954825100101010000101000050427731303001830037300372828703287671001020100002020000300373003711100211091010100001000000006403163329630010000103003830038300383003830038

Test 4: throughput

Count: 8

Code:

  sqdmull v0.4s, v8.4h, v9.h[1]
  sqdmull v1.4s, v8.4h, v9.h[1]
  sqdmull v2.4s, v8.4h, v9.h[1]
  sqdmull v3.4s, v8.4h, v9.h[1]
  sqdmull v4.4s, v8.4h, v9.h[1]
  sqdmull v5.4s, v8.4h, v9.h[1]
  sqdmull v6.4s, v8.4h, v9.h[1]
  sqdmull v7.4s, v8.4h, 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)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)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)9fst unit uop (a7)l1d cache writeback (a8)acbranch cond mispred nonspec (c5)cfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? simd retires (ee)? int retires (ef)f5f6f7f8fd
8020420058150004125801001008000010080000500640000020020200392003999733999780100200800002001600002003920039118020110099100100800001000000511021611200360800001002004020040200402004020040
8020420039150006225801001008000010080000500640000020020200392003999733999780100200800002001600002003920039118020110099100100800001000000511031611200360800001002004020040200402004020040
8020420039150004125801001008000010080000500640000020020200392003999733999780100200800002001600002003920039118020110099100100800001000090511011611200360800001002004020040200402004020040
8020420039150004125801001008000010080000500640000020020200392003999733999780100200800002001600002003920039118020110099100100800001000000511011611200360800001002004020040200402004020040
8020420039150004125801001008000010080000500640000020020200392003999733999780100200800002001600002003920039118020110099100100800001000000511021611200360800001002009620040200402004020040
8020420039150004125801001008000010080000500640000020020200392003999733999780100200800002001600002003920039118020110099100100800001000000511021611200360800001002004020040200402004020040
8020420039150004125801001008000010080000500640000020020200392003999733999780100200800002001600002003920039118020110099100100800001000000511021611200360800001002004020040200402004020040
8020420039150004125801001008000010080000500640000020020200392003999733999780100200800002001600002003920039118020110099100100800001000000511011611200360800001002004020040200402004020040
8020420039150004125801001008000010080000500640000020020200392003999733999780100200800002001600002003920039118020110099100100800001000000511011611200360800001002004020040200402004020040
8020420039150004125801001008000010080000500640000020020200392003999733999780100200800002001600002003920039118020110099100100800001000000511021611200360800001002004020040200402004020040

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)l2 tlb miss data (0b)18191e1f3f51schedule 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)accfd2d5map dispatch bubble (d6)d9daddfetch restart (de)e0? int output thing (e9)? simd retires (ee)? int retires (ef)f5f6f7f8fd
800242003915000000010525800101080000108000050640000020020200392003999963100198001020800002016000020039200391180021109101080000100050200416004620036080000102004020040200402004020040
800242003915000000040258001010800001080000506400000200202003920039999631001980010208000020160000200392003911800211091010800001000502002160051820036080000102004020040200402004020040
800242003915000000040258001010800001080000506400001200202003920039999631001980010208000020160000200392003911800211091010800001000502004160041520036080000102004020040200402004020040
800242003915000000040258001010800001080000506400001200202003920039999631001980010208000020160000200392003911800211091010800001000502004160041920036080000102004020040200402004020040
800242003915000000040258001010800001080000506400000200202003920039999631004680010208000020160000200392003911800211091010800001000502004160041320036080000102004020040200402004020040
8002420039150000000103258001010800001080000506400000200202003920039999631001980010208000020160000200392003911800211091010800001000502004160021120036080000102004020040200402004020040
8002420039160000000221258001010800001080000506400000200202003920039999631001980010208000020160000200392003911800211091010800001000502004160041720036080000102004020040200402004020040
8002420039150000015063258001010800001080000506400000200202003920039999631001980010208000020160000200392003911800211091010800001000502004160041720036080000102004020040200402004020040
800242003915000000040258001010800001080000506400000200202003920039999631001980010208000020160000200392003911800211091010800001000502004160041420036080000102004020040200402004020040
800242003915000000040258001010800001080000506400001200202003920039999631001980010208000020160000200392003911800211091010800001000502002160041820036080000102004020040200402004020040