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

MUL (by element, 4H)

Test 1: uops

Code:

  mul v0.4h, 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)696d6emap 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)accfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)f5f6f7f8fd
100430372300612548251000100010003983133018303730372415328951000100020003037303711100110000673116112630100030383038303830383038
100430372200612548251000100010003983133018303730372415328951000100020003037303711100110000073116112630100030383038303830383038
100430372200612548251000100010003983133018303730372415328951000100020003037303711100110000373116112630100030383038303830383038
100430372200612548251000100010003983133018303730372415328951000100020003037303711100110001073116112630100030383038303830383038
100430372300612548251000100010003983133018303730372415328951000100020003037303711100110000073116112630100030383038303830383038
100430372300612548251000100010003983133018303730372415328951000100020003037303711100110000073116112630100030383038303830383038
100430372200612548251000100010003983133018303730372415328951000100020003037303711100110000073116112630100030383038303830383038
100430372210612548251000100010003983133018303730372415328951000100020003037303711100110000073116112630100030383038303830383038
100430372200822548251000100010003983133018303730372415328951000100020003037303711100110000073116112630100030383038303830383038
100430372300612548251000100010003983133018303730372415328951000100020003037303711100110000073116112630100030383038303830383038

Test 2: Latency 1->2

Code:

  mul v0.4h, 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)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)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 cache writeback (a8)accfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)? int retires (ef)f5f6f7f8fd
1020430037224007062954825101001001000010010000500427731330018300373003728265328745101002001000020020000300373003711102011009910010010000100107101161129634100001003003830038300383003830038
1020430037224002292954825101001001000010010000500427731330018300373003728265328745101002001000020020000300373003711102011009910010010000100007101161129634100001003003830038300383003830038
1020430037225001262954825101001001000010010000500427731330018300373003728265328745101002001000020020000300373003711102011009910010010000100007101161129634100001003003830038300383003830038
1020430037225005032954825101001001000010010000500427731330018300373003728265328745101002001000020020000300373003711102011009910010010000100007101161129634100001003003830038300383003830038
102043003722500842954825101001001000010010000500427731330018300373003728265328745101002001000020020000300373003711102011009910010010000100007101162129634100001003003830038300383003830038
102043003722500612954825101001001000010010000500427731330018300373003728265328745101002001000020020000300373003711102011009910010010000100007101161129634100001003003830038300383003830038
1020430037225001872954825101001001000010010000500427731330018300373003728265328745101002001017520020000300373003711102011009910010010000100007101160129634100001003003830038300383003830038
1020430037224002142954825101001001000010010000500427731330018300373003728265328745101002001000020020000300373003711102011009910010010000100007101161129634100001003003830038300383003830038
102043003722500612954825101001001000010010000500427731330018300373003728265328745101002001000020020000300373003711102011009910010010000100007101161129634100001003003830038300383003830038
1020430037225001662954825101001001000010010000500427731330018300373003728265328745101002001000020020000300373003711102011009910010010000100037101161129670100001003003830038300383003830086

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)accdcfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)? int retires (ef)f5f6f7f8fd
100243003722501032954825100101010000101000050427731313001830037300372828732876710010201000020200003003730037111002110910101000010100640216222963010000103003830038300383003830038
10024300372250612954825100101010000101000050427731313001830037300372828732876710010201000020200003003730037111002110910101000010000640216222963010000103003830038300383003830038
10024300372250612954825100101010000101000050427731313001830037300372828732876710010201000020200003003730037111002110910101000010000640216222963010000103003830038300383003830038
10024300372250612954825100101010000101000050427731303001830037300372828732876710010201000020200003003730037111002110910101000010000640216222963010000103003830038300383003830038
10024300372250612954825100101010000101000050427731313001830037300372828732876710010201000020200003003730037111002110910101000010000640216322963010000103003830038300383003830038
10024300372251291452954825100101010000101000050427731313001830037300372828732876710010201000020200003003730037111002110910101000010000640216322963010000103003830038300383003830038
10024300372250662954825100101010000101000050427731313001830037300372828732876710010201000020200003003730037111002110910101000010000640216322963010000103003830038300383003830038
10024300372250612954825100101010000101000050427731303001830037300372828732876710010201000020200003003730037111002110910101000010000640216222963010000103003830038300383003830038
10024300372250612954825100101010000101000050427731313001830037300372828732876710010201000020200003003730037111002110910101000010000640216322963010000103003830038300383003830038
10024300372250612954825100101010000101000050427731313001830037300372828732878710010201000020200003003730037111002110910101000010000640216332966810000103003830038300383003830038

Test 3: Latency 1->3

Code:

  mul v0.4h, 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)0318191e1f3f4e51schedule 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 cache writeback (a8)acc2cfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)? int retires (ef)f5f6f7f8fd
1020430037225000012629548251010010010000100100005004277313300183003730037282653287451010020010000200200003003730037111020110099100100100001000007101163129634100001003003830038300383003830038
1020430037225000017029548251010010010000100100005004277313300183003730037282653287451010020010000200200003003730037111020110099100100100001000007101162129634100001003003830038300383003830038
102043003722500006129548251010010010000100100005004277313300183003730037282653287451010020010000200200003003730037111020110099100100100001000007101162129634100001003003830038300383003830038
102043003722500006129548251010010010000100100005004277313300183003730037282653287451010020010000200200003003730037111020110099100100100001000007101162229634100001003003830038300383003830038
102043003722500006129548251010010010000100100005004277313300183003730037282653287451010020010000200200003003730037111020110099100100100001000007101162129634100001003003830038300383003830038
102043003722500006129548251010010010000100100005004277313300183003730037282653287451010020010000200200003003730037111020110099100100100001000007101162129634100001003003830038300383003830038
102043003722500006129548251010010010000100100005004277313300183003730037282653287451010020010000200200003003730037111020110099100100100001000007101161129634100001003003830038300383003830038
102043003722500006129548251010010010000100100005004277313300183003730037282653287451010020010000200200003003730037111020110099100100100001000007101162129634100001003003830038300383003830038
102043003722500006129548251010010010000100100005004277313300183003730037282653287451010020010000200200003003730037111020110099100100100001000007101161229634100001003003830038300383003830038
102043003722500006129548251010010010000100100005004277313300183003730037282653287451010020010000200200003003730037111020110099100100100001000007101162129634100001003003830038300383003830038

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 tlb miss (a1)ld unit uop (a6)l1d cache writeback (a8)a9acc2cfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)? int retires (ef)f5f6f7f8fd
100243003722506129548251001010100001010000504277313030018300373003728287132876710010201000020200003003730037111002110910101000010000000640416222963010000103003830038300383003830038
1002430037224420612954864100101010000101000050427731303001830037300372828732876710010201000020200003003730037111002110910101000010000000640216222963010000103003830038300383003830038
10024300372250612954825100101010000101000050427731313001830037300372828732876710010201000020200003003730037111002110910101000010004200640216222963010000103003830038300383003830038
10024300372330612954825100101010000131000050427731313001830037300372828732876710010201000020200003003730037111002110910101000010001060640216222963010000103003830038300383003830038
10024300372240612954825100101010000101000050427731313001830037300372828732876710010201000020200003003730037111002110910101000010000000640216222963010000103003830038300383003830038
10024300372250612954825100101010000101000050427731313001830037300372828732876710159201000020200003003730037111002110910101000010000000640216222963010000103003830038300383003830038
10024300372250612954825100101010000101000050427731313001830037300372828732876710010201000020200003003730037111002110910101000010000000640216222963010000103003830038300383003830038
10024300372250612954825100101010000101000050427731313001830037300372828732876710010201000020200003003730037111002110910101000010000000640216222963010000103003830038300383003830038
10024300372250612954825100101010000101000050427731313001830037300372828732876710010201000020200003003730037111002110910101000010000000640216222963010000103003830038300383003830038
100243003722512612954825100101010000101000050427731313001830037300372828732876710010201000020200003003730037111002110910101000010000000640216222963010000103003830038300383003830038

Test 4: throughput

Count: 8

Code:

  mul v0.4h, v8.4h, v9.h[1]
  mul v1.4h, v8.4h, v9.h[1]
  mul v2.4h, v8.4h, v9.h[1]
  mul v3.4h, v8.4h, v9.h[1]
  mul v4.4h, v8.4h, v9.h[1]
  mul v5.4h, v8.4h, v9.h[1]
  mul v6.4h, v8.4h, v9.h[1]
  mul v7.4h, 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)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 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)9facc2cfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? simd retires (ee)? int retires (ef)f5f6f7f8fd
8020420060150041258010010080000100800005006400001200202003920039997339997801002008000020016000020039200391180201100991001008000010000511021611200360800001002004020040200402004020040
8020420039150041258010010080000100800005006400001200202003920039997339997801002008000020016000020039200391180201100991001008000010000511011611200360800001002004020040200402004020040
8020420039150041258010010080000100800005006400001200202003920039998239997801002008000020016000020039200391180201100991001008000010000511011611200360800001002004020040200402004020040
80204200391500611258010010080000100800005006400001200202003920039997339997801002008000020016000020039200391180201100991001008000010000511011611200360800001002004020040200402004020040
8020420039150041258010010080000100800005006400001200202003920039997339997801002008000020016000020039200391180201100991001008000010000511011611200360800001002004020040200402004020040
8020420039150041258010010080000100800005006400001200202003920039997339997801002008000020016000020039200391180201100991001008000010000511011611200360800001002004020040200402004020040
8020420039150041258010010080000100800005006400001200202003920039997339997801002008000020016000020039200391180201100991001008000010000511011611200360800001002004020040200902004020040
8020420039150041258010010080000100800005006400001200202003920039997339997801002008000020016000020039200391180201100991001008000010032511011611200360800001002004020040200402004020040
8020420039150341258010010080000100800005006400001200202003920039997339997801002008000020016000020039200391180201100991001008000010000511011611200360800001002004020040200402004020040
8020420039150041258010010080000100800005006400001200202003920039997339997801002008000020016000020039200391180201100991001008000010000511011611200360800001002004020040200402004020040

1000 unrolls and 10 iterations

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

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 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)acc2branch mispred nonspec (cb)cfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)? int retires (ef)f5f6f7f8fd
80024200481500402580010108000010800005064000012002020039200399996310019800102080000201600002003920039118002110910108000010000005020616352003680000102004020040200402004020040
8002420039150192402580010108008010800005064000012002020039200399996310019800102080000201600002003920039118002110910108000010010005020516532003680000102004020040200402004020040
800242003915024402580010108000010800005064000012002020039200399996310019800102080000201600002003920039118002110910108000010000005020316352003680000102004020040200402004020040
800242003915027402580010108000010800005064000012002020039200399996310019800102080000201600002003920039118002110910108000010000005020316352003680000102004020040200402004020040
80024200391500402580010108000010800005064000012002020039200399996310019800102080000201600002003920039118002110910108000010000005020416532003680000102004020040200402004020040
80024200391500402580010108000010800005064000012002020039200399996310019800102080000201600002003920039118002110910108000010000005020516532003680000102004020040200402004020040
80024200391500402580010108000010800005064000012002020039200399996310019800102080000201600002003920039118002110910108000010000005020316552003680000102004020040200402004020040
80024200391500402580010108000010800005064000012002020039200399996310019800102080000201600002003920039118002110910108000010000005020516532003680000102004020040200402004020040
800242003915004025800101080000108000050640000120020200392003910011310019800102080000201600002003920039118002110910108000010000005020316452003680000102004020040200402004020040
80024200391500402580010108000010800005064000012002020039200399996310019800102080000201600002003920039118002110910108000010100005056575552023080000102004020040200402004020040