Apple M1 Microarchitecture Research by Dougall Johnson

Firestorm: Overview | Base Instructions | SIMD and FP Instructions
Icestorm:  Overview | Base Instructions | SIMD and FP Instructions

PMULL (1Q)

Test 1: uops

Code:

  pmull v0.1q, v0.1d, v1.1d
  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 (01)cycle (02)031e3f4e51inst issue (52)~issue fp/simd (54)~dispatch fp/simd (57)huge thing fp/simd (5b)60696d6edispatch stall (70)scheduler rewind (75)scheduler stall (76)~dispatch op (78)~map op fp/simd (7e)~map lookup fp/simd (81)8283pipeline redirect (84)85inst all (8c)inst neon or fp (9a)a8accfd5d6ddinst fetch restart (de)e0? fp/simd (ee)f5f6f7f8fd
100430372406125482510001000100039831313018303730372415328951000100020003037303711100110000073216112630100030383038303830383038
100430372206125482510001000100039831303018303730372415328951000100020003037303711100110000073116112630100030383038303830383038
100430372306125482510001000100039831303018303730372415328951000100020003037303711100110000073116112630100030383038303830383038
100430372308425482510001000100039831303018303730372415328951000100020003037303711100110000073116112630100030383038303830383038
100430372306125482510001000100039831303018303730372415328951000100020003037303711100110000073116112630100030383038303830383038
100430372206125482510001000100039831303018303730372415328951000100020003037303711100110000073116112630100030383038303830383038
1004303723010325482510001000100039831303018303730372415328951000100020003037303711100110000073116112630100030383038303830383038
100430372306125482510001000100039831303018303730372415328951000100020003037303711100110000073116112630100030383038303830383038
100430372306125482510001000100039831303018303730372415328951000100020003037303711100110000073116112630100030383038303830383038
100430372206125482510001000100039831313018303730372415328951000100020003037303711100110000073116112630100030383038303830383038

Test 2: Latency 1->2

Code:

  pmull v0.1q, v0.1d, v1.1d
  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 (01)cycle (02)0318191e1f3f4e51inst issue (52)~issue int (53)~issue fp/simd (54)~dispatch int (56)~dispatch fp/simd (57)huge thing int (59)huge thing fp/simd (5b)60696d6edispatch stall (70)scheduler rewind (75)scheduler stall (76)~dispatch op (78)~map op int (7c)~map op fp/simd (7e)~map lookup int (7f)~map lookup fp/simd (81)8283pipeline redirect (84)85inst all (8c)inst branch (8d)inst branch taken (90)inst b.cc (94)inst integer (97)inst neon or fp (9a)9fa6a8accfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
102043003722500360962954825101001001000010010000500427731303001830037300372826532874510100200100002002000030037300371110201100991001001000010000071011611296340100001003003830038300383003830038
10204300372250045007262954825101001001000010010000500427731303001830037300372826532874510100200100002002000030037300371110201100991001001000010000071221611296340100001003003830038300383003830038
102043003722500240612954825101001001000010010000500427731303001830037300372826532874510100200100002002000030037300371110201100991001001000010000071011611296340100001003003830038300383003830038
102043003722400150612954825101001001000010010000626427731303001830037300372826532874410125200100002002000030037300371110201100991001001000010000071011611296340100001003003830038300383003830038
102043003722500005362954825101001001000010010000500427731313001830037300372826532874510100200100002002000030037300371110201100991001001000010000071011711296340100001003003830038300383003830038
10204300372250033903462954825101001001000010010000500427731303001830037300372826532874510100200100002002000030037300371110201100991001001000010000075937011296340100001003003830038300383003830038
1020430037225001502512954825101001001000010010000500427731303001830037300372826532874510100200100002002000030037300371110201100991001001000010000071011611296340100001003003830038300383003830038
10204300372240015025129548251010010010000100100006264277313030018300373003728265328744101002001000020020000300373003711102011009910010010000100000710116112963425100001003003830038300383003830038
10204300372250060612954825101001001000010010000500427731303001830037300372826532874410100200100002002000030037300371110201100991001001000010000071221711296340100001003003830038300383003830038
102043003722500180612954825101001001000010010000500427731303001830037300372826532874410100200100002002000030037300371110201100991001001000010000071011611296340100001003003830038300383003830038

1000 unrolls and 10 iterations

Result (median cycles for code): 3.0037

retire (01)cycle (02)0304090b1e3a3f4e51inst issue (52)~issue int (53)~issue fp/simd (54)~dispatch int (56)~dispatch fp/simd (57)huge thing int (59)huge thing fp/simd (5b)696d6edispatch stall (70)scheduler rewind (75)scheduler stall (76)~dispatch op (78)~map op int (7c)~map op fp/simd (7e)~map lookup int (7f)~map lookup fp/simd (81)8283pipeline redirect (84)85inst all (8c)inst branch (8d)inst branch taken (90)inst b.cc (94)inst integer (97)inst neon or fp (9a)9fa8accdcfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
10024300372250000266295482510010101000010100005042773133001830037300372828732876710010201000020200003003730037111002110910101000010000644101610102963010000103003830038300383003830038
10024300372240000266295482510010101000010100005042773133001830037300372828732876710010201000020200003003730037111002110910101000010000644101610102963010000103003830038300383003830038
100243003722500002662954825100101010000101000050427731330018300373003728287328767100102010000202000030037300371110021109101010000100006441016882963010000103003830038300383003830038
1002430037225010026629548251001010100001010000504277313301263003730037282878287861001020100002020000300373003711100211091010100001000064410168102963010000103003830038300383003830038
10024300372250000266295482510010101000010100005042773133001830037300372828732876710010201000020200003003730037111002110910101000010000644101610102963010000103003830038300383003830038
1002430037225000897266295482510010101000810100005042773133001830037300832828732876710010201000022200003003730037111002110910101000010000644101611102963010000103003830038300383003830038
100243003722510032662954825100101010000101000050427731330018300373003728287328767100102010000202000030037300371110021109101010000100006445165102963010000103003830038300383003830038
1002430037225100026629548251001010100001010000504277313300183003730037282873287671001020100002020000300373003711100211091010100001006064410166112963010000103003830038300383003830038
10024300372251100266295482510010101000010100005042773133001830037300372828732876710010201000020200003003730037111002110910101000010000644101611102970110000103003830038300383003830038
1002430037224100026629548251001010100001010000504277313300183003730037282873287671001020100002020000300373003711100211091010100001000064461610102963010000103003830038300383003830038

Test 3: Latency 1->3

Code:

  pmull v0.1q, v1.1d, v0.1d
  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 (01)cycle (02)0308090b18191e1f3a3f4e51inst issue (52)~issue int (53)~issue fp/simd (54)~dispatch int (56)~dispatch fp/simd (57)huge thing int (59)huge thing fp/simd (5b)60696d6edispatch stall (70)scheduler rewind (75)scheduler stall (76)~dispatch op (78)~map op int (7c)~map op fp/simd (7e)~map lookup int (7f)~map lookup fp/simd (81)8283pipeline redirect (84)85inst all (8c)inst branch (8d)inst branch taken (90)inst b.cc (94)inst integer (97)inst neon or fp (9a)9fa0a1a6a7a8a9acc2cfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
10204300372240000000061295482510100100100001001000050042773131300183003730037282653287451010020010000200200003003730037111020110099100100100001000000000071011611296340100001003003830038300383003830038
10204300802250000000061295482510100100100001001000050042773130300183003730037282653287451010020010180200200003003730037111020110099100100100001000000000071011611296340100001003003830038300383003830038
10204300372250000000089295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000000000071011611296340100001003003830038300383003830038
10204300372250000000061295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000000000071011611296340100001003003830038300383003830038
10204300372250100000061295482510100100100001001000050042773130300183008530084282653287451010020010000200200003003730037111020110099100100100001000000000071011611296340100001003003830038300383003830038
10204300372250000000061295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000000000071011611296340100001003003830038300383003830038
10204300372250000000061295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000000000071011611296340100001003003830038300383003830038
10204300372250000000061295482510100100100001001000050042773131300183003730037282653287451010020010000200200003003730037111020110099100100100001000000000071011611296340100001003003830038300383003830038
10204300372250000000061295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000000000071011611296340100001003003830038300383003830038
10204300372241000000061295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000000000071011611296340100001003003830038300383003830038

1000 unrolls and 10 iterations

Result (median cycles for code): 3.0037

retire (01)cycle (02)031e1f3f4e51inst issue (52)~issue int (53)~issue fp/simd (54)~dispatch int (56)~dispatch fp/simd (57)huge thing int (59)huge thing fp/simd (5b)60696d6edispatch stall (70)scheduler rewind (75)scheduler stall (76)~dispatch op (78)~map op int (7c)~map op fp/simd (7e)~map lookup int (7f)~map lookup fp/simd (81)8283pipeline redirect (84)85inst all (8c)inst branch (8d)inst branch taken (90)inst b.cc (94)inst integer (97)inst neon or fp (9a)9fa8accfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
10024300372250061295482510010101000010100005042773131300183003730037282873287671001020100002020000300373003711100211091010100001000640216222963010000103003830038300383003830038
1002430037225001156295482510010101000010100005042773130300183003730037282873287671001020100002020000300373003711100211091010100001000640216222963010000103003830038300383003830038
10024300372250061295482510010101000010100005042773130300183003730037282873287671001020100002020000300373003711100211091010100001000640216222963010000103003830038300383003830038
10024300372250061295482510010101000010100005042773130300543003730037282873287671001020100002020000300373003711100211091010100001000640216222963010000103003830038300383003830038
10024300372250061295482510010101000010100005042773130300183003730037282873287671001020100002020000300373003711100211091010100001000640216222963010000103003830038300383003830038
10024300372250061295482510010101000010100005042773130300183003730037282873287671001020100002020000300373003711100211091010100001000640216222963010000103003830038300383003830038
10024300372250061295482510010101000010100005042773130300183003730037282873287671001020100002020000300373003711100211091010100001000640216222963010000103003830038300383003830038
10024300372250061295482510010101000010100005042773130300183003730037282873287671001020100002020000300373003711100211091010100001000640216222963010000103003830038300383003830038
10024300372240061295482510010101000010100005042773130300183003730037282873287671001020100002020000300373003711100211091010100001060640216222963010000103003830038300383003830038
10024300372240061295482510010101000010100005042773130300183003730037282873287671001020100002020000300373003711100211091010100001000640216222963010000103003830038300383003830038

Test 4: throughput

Count: 8

Code:

  pmull v0.1q, v8.1d, v9.1d
  pmull v1.1q, v8.1d, v9.1d
  pmull v2.1q, v8.1d, v9.1d
  pmull v3.1q, v8.1d, v9.1d
  pmull v4.1q, v8.1d, v9.1d
  pmull v5.1q, v8.1d, v9.1d
  pmull v6.1q, v8.1d, v9.1d
  pmull v7.1q, v8.1d, v9.1d
  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 (01)cycle (02)033f51inst issue (52)~issue int (53)~issue fp/simd (54)~dispatch int (56)~dispatch fp/simd (57)huge thing int (59)huge thing fp/simd (5b)6061696d6edispatch stall (70)scheduler rewind (75)scheduler stall (76)~dispatch op (78)~map op int (7c)~map op fp/simd (7e)~map lookup int (7f)~map lookup fp/simd (81)8283pipeline redirect (84)85inst all (8c)inst branch (8d)inst branch taken (90)inst b.cc (94)inst integer (97)inst neon or fp (9a)9fa8acc5branch mispredict (cb)cdcfd0d2d5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
802042003915013525801081008000810080020500640132102002020039200399977699908012020080032200160064200392003911802011009910010080000100001115118001160020036800001002004020040200402004020040
80204200391509525801081008000810080020500640132002002020039200399977699908012020080032200160064200392003911802011009910010080000100001115118000160020036800001002004020040200402004020040
80204200391509525801081008000810080020500640132002002020039200399977699908012020080032200160064200392003911802011009910010080000100001115118000160020036800001002004020040200402004020040
802042003915014325801081008000810080020500640132002002020039200399977699908012020080032200160064200392003911802011009910010080000100001115118000160020036800001002004020040200402009220040
80204200391503025801081008000810080020500640132102002020039200399973399978010020080000200160000200392003911802011009910010080000100000005110001161120036800001002004020040200402004020040
80204200391504125801001008000010080000500640000002002020039200399973399978010020080000200160000200392003911802011009910010080000100000005110001161120036800001002004020040200402004020040
802042003915074625801001008000010080000500640000002002020039200399973399978010020080000200160000200392003911802011009910010080000100000005110001161120036800001002004020040200402004020040
802042003915082525801001008000010080000500640000102002020039200399973399978010020080000200160000200392003911802011009910010080000100000005110001161120036800001002004020040200402004020040
802042003915021725801001008000010080000500640000002002020039200399973399978010020080000200160000200392003911802011009910010080000100000005110001161120036800001002004020040200402004020040
802042003915041258010010080000100800005006400001020020200392003999733999780100200800002001600002003920039118020110099100100800001002430005110001161120036800001002004020040200402004020040

1000 unrolls and 10 iterations

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

retire (01)cycle (02)03080a0b18191e1f3f51inst issue (52)~issue int (53)~issue fp/simd (54)~dispatch int (56)~dispatch fp/simd (57)huge thing int (59)huge thing fp/simd (5b)60696d6edispatch stall (70)scheduler rewind (75)scheduler stall (76)~dispatch op (78)~map op int (7c)~map op fp/simd (7e)~map lookup int (7f)~map lookup fp/simd (81)8283pipeline redirect (84)85inst all (8c)inst branch (8d)inst branch taken (90)inst b.cc (94)inst integer (97)inst neon or fp (9a)9fa1a6a8acc2branch mispredict (cb)cfd0d5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
800242004815000000001282580010108000010800005064000002002020039200399996310019800102080000201600002009320092118002110910108000010000000502002816162820036080000102004020040200402004020040
800242003915000000002202580010108000010800005064000002002020039200399996310019800102080000201600002003920039118002110910108000010000000502002816222620036080000102004020040200402004020040
80024200391500000000402580010108000010800005064000002002020039200399996310019800102080000201600002003920039118002110910108000010000000502002116272220036080000102004020040200402004020040
8002420039150000000040258001010800001080000506400000200202003920039999631001980010208000020160000200392003911800211091010800001000148300502001716281720036080000102004020040200402004020040
80024200391500000000402580010108000010800005064000002002020039200399996310019800102080000201600002003920039118002110910108000010005000502002716172820036080000102024620040200402004020040
80024200391500000000402580010108000010800005064000002002020039200399996310019800102080000201600002011520039118002110910108000010000000502001716271620036080000102004020040200402004020040
80024200391500000000402580010108000010800005064000012002020039200399996310019800102080000201600002003920039118002110910108000010000000502002116281620036080000102004020040200402004020040
80024200391500000028888402580010108000010800005064000002002020039200399996310019800102080000201600002003920039118002110910108000010000000502002116281720036280000102004020040200402004020040
80024200391490000000402580010108000010800005064000002002020039200399996310019800102080000201600002003920039118002110910108000010000000502002816282820036080000102004020040200402004020040
800242003915000000005692580010108000010800005064000012002020039200399996310019800102080000201600002003920039118002110910108000010000000502002816292820036080000102004020040200402004020040