Apple M1 Microarchitecture Research by Dougall Johnson

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

FRINTZ (vector, 8H)

Test 1: uops

Code:

  frintz v0.8h, v0.8h
  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)030b191e3f4e51inst 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)a1a8accfd5d6ddinst fetch restart (de)e0? fp/simd (ee)f5f6f7f8fd
100430372200061254725100010001000398160130183037303724143289510001000100030373037111001100000073116112629100030383038303830383038
1004303722002482254725100010001000398160030183037303724143289510001000100030373037111001100000073116112629100030383038303830383038
100430372300061254725100010001000398160030183037303724143289510001000100030373037111001100000373116112701100030383038303830383038
1004303723001261254725100010001000398160130183037303724143289510001000100030373037111001100000073116112629100030383038303830383038
100430372300061254725100010001000398160130183037303724143289510001000100030373037111001100001073116112629100030383038303830383038
100430372300061254725100010001000398160130183037303724143289510001000100030373037111001100000073116112629100030383038303830383038
100430372300061254725100010001000398160130183037303724143289510001000100030373037111001100001073116112629100030383038303830383038
1004303722000103254725100010001000398160130183037303724143289510001000100030373037111001100000073116112629100030383038303830383038
100430372300082254725100010001000398160130183037303724143289510001000100030373037111001100000073116112629100030383038303830383038
100430372300061254725100010001000398160030183037303724143289510001000100030373037111001100000373116112629100030383038303830383038

Test 2: Latency 1->2

Code:

  frintz v0.8h, v0.8h
  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)030b18191e1f3a3f4e51inst 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)9fa0a1a6a7a8a9acc2c5branch mispredict (cb)cdcfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
1020430037225000000168295472510100100100001001000050042771600300183003730037282643287451010020010000200100003003730037111020110099100100100001000000003000071011611296330100001003003830038300383008530038
102043003722500000061295472510100100100001001000050042771601300183003730037282643287451010020010000200100003003730037111020110099100100100001000000003000071011611296330100001003003830038300383003830038
102043003722500000061295472510100100100001001000050042771601300183003730037282643287451010020010000200100003003730037111020110099100100100001000200000000071011611296330100001003003830038300383003830038
102043003722500000261295472510100100100001001000050042771601300183003730037282643287451010020010000200100003003730037111020110099100100100001000000000000071031611296330100001003008530085300383003830038
1020430037225000000168295472510100100100001001000050042771601300183003730037282643287451010020210000200100003003730037111020110099100100100001000000300000071011611296330100001003003830038300383003830228
1020430037225000120061295472510100100100001001000050042771601300183003730037282643287451010021010000200100003003730037111020110099100100100001000000000000071011611296330100001003003830038300383003830038
10204300372250002100103295472510100100100001001000050042771600300183003730037282643287451010020010000200100003013330037111020110099100100100001000000003000071011611296330100001003003830038300383003830038
102043003722500000061295472510100100100001001000050042771600300183003730037282643287451010020010000200100003003730037111020110099100100100001000000000000071011611296330100001003003830038300383003830038
102043003722500000061295472510100100100001001000050042771600300183003730037282643287451010020010000200100003003730037111020110099100100100001000000000000071011611296330100001003003830038300383003830038
102043003722400000061295472510100100100001001000050042771600300183003730037282643287451010020010000200100003003730037111020110099100100100001000000000000071011611297050100001003003830038300383003830038

1000 unrolls and 10 iterations

Result (median cycles for code): 3.0037

retire (01)cycle (02)031e3f4e51inst 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)9fa7a8accfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
100243003722512612954725100101010000101000050427716013001830037300372828632876710010201000020100003003730037111002110910101000010010640216222962910000103003830038300383003830038
1002430037225121032954725100101010000101000050427716013001830037300372828632876710010201000020100003003730037111002110910101000010013640216222962910000103003830038300383003830038
10024300372250612954725100101010000101000050427716003001830037300372828672876710162201000020100003003730037111002110910101000010013640216222962910000103003830038300383003830038
1002430037225127682954725100101010000101000050427716003001830037300372828632876710010201000020100003003730037111002110910101000010013640216222962910000103003830038300383003830038
1002430037225121032954725100101010000101000050427716013001830037300372828632876710010201000020100003003730037111002110910101000010010640216222962910000103003830038300383003830038
100243003722501032954725100101010000101000050427716013001830037300372828632876710010201000020100003003730037111002110910101000010003640216222962910000103003830038300383003830038
1002430037225121032954725100101010000101000050427716013001830037300372828632876710010201000020100003003730037111002110910101000010013640216222962910000103003830038300383003830038
1002430037225121032954725100101010000101000050427716013001830037300372828632876710010201000020100003003730037111002110910101000010013640216222962910000103003830038300383003830038
1002430037225121032954725100101010000101000050427716003001830037300372828632876710010201000020100003003730037111002110910101000010000640216222962910000103003830038300383003830038
1002430037225121032954725100101010000101000050427716003001830037300372828632876710010201000020100003003730037111002110910101000010003640216222962910000103003830038300383003830038

Test 3: throughput

Count: 8

Code:

  frintz v0.8h, v8.8h
  frintz v1.8h, v8.8h
  frintz v2.8h, v8.8h
  frintz v3.8h, v8.8h
  frintz v4.8h, v8.8h
  frintz v5.8h, v8.8h
  frintz v6.8h, v8.8h
  frintz v7.8h, v8.8h
  movi v8.16b, 9

(fused SUBS/B.cc loop)

100 unrolls and 100 iterations

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

retire (01)cycle (02)031e3f51inst 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)9fa8a9acc5branch mispredict (cb)cdcfd5d6dde0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
80204200581502227372580108100800081008002050064013202002020039200399977699908012020080032200800322003920039118020110099100100800001001031115118016020036800001002004020040200402004020040
802042003915012722580108100800081008002050064013212002020039200399977699908012020080032200800322003920039118020110099100100800001001001115118016020036800001002004020040200402004020040
80204200391500722580108100800081008002050064013202002020039200399977699908012020080032200800322003920039118020110099100100800001000031115118016020036800001002004020040200402004020040
802042003915012722580108100800081008002050064013212002020039200399977699908012020080032200800322003920039118020110099100100800001001001115118016020036800001002004020040200402004020040
802042003915012722580108100800081008002050064013212002020039200399977699908012020080032200800322003920039118020110099100100800001000031115118016020036800001002004020040200402004020040
8020420039150122422580108100800081008002050064013212002020039200399977699908012020080032200800322003920039118020110099100100800001001001115118016020036800001002004020040200402004020040
802042003915012722580108100800081008002050064013202002020039200399977699908012020080032200800322003920039118020110099100100800001000017401115118016020036800001002004020040200402004020040
802042003915012302580108100800081008002050064013212002020039200399977699908012020080032200800322003920039118020110099100100800001001031115118016020036800001002004020040200402004020040
80204200391500302580108100800081008002050064013202002020039200399977699908012020080032200800322003920039118020110099100100800001001001115118016020036800001002004020040200402004020040
802042003915012512580108100800081008002050064013212002020039200399977699908012020080032200800322003920039118020110099100100800001000001115118016020036800001002004020040200402004020040

1000 unrolls and 10 iterations

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

retire (01)cycle (02)031e3f51inst 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)9fa8a9accfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
800242003915012822580010108000010800005064082002002020039200399996310019800102080000208000020039200391180021109101080000101035020216322003680000102004020040200402004020040
800242003915012402580010108000010800005064000002002020039200399996310019800102080000208000020039200391180021109101080000101005020316632003680000102004020040200402004020040
800242003915007262580010108000010800005064000002002020039200399996310019800102080000208000020039200391180021109101080000101035020216332003680000102004020040200402004020040
800242003915012822580010108000010800005064000002002020039200399996310019800102080000208000020039200391180021109101080000101035020216352003680000102004020040200402004020040
800242003915001262580010108000010800005064000002002020039200399996310019800102080000208000020039200391180021109101080000101035020316232003680000102004020040200402004020040
800242003915012822580010108000010800005064000002002020039200399996310019800102080000208000020039200391180021109101080000100005020316322003680000102004020040200402004020040
800242003915012822580010108000010800005064000012002020039200399996310019800102080000208000020039200391180021109101080000101005020616322003680000102004020040200402004020040
8002420039150012425800101080000108000050640000120020200392003910007310019800102080000208000020039200391180021109101080000100005020516762003680000102004020040200402004020040
80024200391500402580010108000010800005064000012002020039200399996310019800102080000208000020039200391180021109101080000100005020316662003680000102004020040200402004020040
80024200391500402580010108000010800005064000012002020039200399996310019800102080000208000020039200391180021109101080000100005020316322003680000102004020040200402004020040