Apple M1 Microarchitecture Research by Dougall Johnson

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

FRINTM (vector, 2S)

Test 1: uops

Code:

  frintm v0.2s, v0.2s
  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)a8a9accfd5d6ddinst fetch restart (de)e0? fp/simd (ee)f5f6f7f8fd
1004303724061254725100010001000398160030183037303724143289510001000100030373037111001100000073116112629100030383038303830383038
1004303723061254725100010001000398160030183037303724143289510001000100030373037111001100020073116112629100030383038303830383038
1004303723061254725100010001000398160030183037307324143289510001000100030373037111001100000073116112629100030383038303830383038
1004303723089254725100010001000398160030183037303724143289510001000100030373037111001100000073116112629100030383038303830383038
1004303723061254725100010001000398160030183037303724143289510001000100030373037111001100000073116112629100030383038303830383038
1004303724061254725100010001000398160030183037303724143289510001000100030373037111001100000073116112629100030383038303830383038
1004303723061254725100010001000398160030183037303724143289510001000100030373037111001100000073116112629100030383038303830383038
1004303724061254725100010001000399512030183037303724143289510001000100030373037111001100000073116112629100030383038303830383038
1004303724061254725100010001000398160030183037303724143289510001000100030373037111001100000073116112629100030383038303830383038
1004303724061254725100010001000398160030183037303724143289510001000100030373037111001100030073116112629100030383038303830383038

Test 2: Latency 1->2

Code:

  frintm v0.2s, v0.2s
  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)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)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)9fa0a8acc5branch mispredict (cb)cdcfd0d2d5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
102043003723302512954725101001001000010010000500427716010300183003730037282643287451010020010000200100003003730037111020110099100100100001000000007100011611296330100001003003830038300383003830038
10204300372320612954725101001001000010010000500427716010300183003730037282643287451010020010000200100003003730037111020110099100100100001000000007100011611296470100001003003830038300383003830038
10204300372320612954725101001001000010010000500427716015300183003730037282643287451010020010000200100003003730037111020110099100100100001000000007105511611296330100001003003830038300383003830038
10204300372330612954725101001001000010010000500427716010300183003730037282643287451010020010000200100003003730037111020110099100100100001000000007100011611296330100001003003830038300383003830038
102043003723301562954725101001001000010010000500427716010300183003730037282643287451010020010000200100003003730037111020110099100100100001000000007100011611296330100001003003830038300383003830038
10204300372330612954725101001001000010010000500427716010300183003730037282643287451010020010000200100003003730037111020110099100100100001000000007100011611296330100001003003830038300383003830038
10204300372330612954725101001001000010010000500427716010300183003730037282643287451010020010000200100003003730037111020110099100100100001000000007100011611296330100001003003830038300383003830038
10204300372330612954725101001001000010010000500427716010300183003730037282643287451010020010000200100003003730037111020110099100100100001000000007105011611296330100001003003830038300383003830038
10204300372330612954725101101001000010010000500427716010300183003730037282643287451010020010000200100003003730037111020110099100100100001000000007105011611296330100001003003830038300383003830038
10204300372320612954725101001001000010010000500427716005300183003730037282643287451010020010000200100003003730037111020110099100100100001000000007100011611296330100001003003830038300383003830038

1000 unrolls and 10 iterations

Result (median cycles for code): 3.0037

retire (01)cycle (02)03080b191e1f3a3f4e51inst 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)9fa0a6a8acc5cdcfd5d6daddinst fetch restart (de)e0eb? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
100243003722500000266295472510010101000010100005042771600300183003730037282863287671001020100002010000300373003711100211091010100001000000064411160101029629010000103003830038300383003830038
10024300372250000026629547251001010100001010000504277160030018300373003728286328767100102010000201000030037300371110021109101010000100033006441116051029629010000103003830038300383003830038
10024300372240000023902954725100101010000101000050427716003001830037300372828632876710010201000020100003003730037111002110910101000010004200064411160101029629010000103003830038300383003830038
1002430037225000002541295472510010101000010100005042771600300183003730037282863287671001020100002010000300373003711100211091010100001000000064410160111129629010000103003830038300383003830038
10024300372250000021612954725100101010000101000050427716003001830037300372828632876710010201000020100003003730037111002110910101000010000000644816010829629010000103003830038300383003830038
100243003722500000266295472510010101000010100005042771600300183003730037282863287671001020100002010000300373003711100211091010100001000000064411160111029629010000103003830038300383003830038
100243003722500000266295472510010101000010100005042771600300183003730037282863287671001020100002010000300373003711100211091010100001000000064410160101029629010000103003830038300383003830038
100243003722500000262295472510010101000010100005042771600300183003730037282863287671001020100002010000300373003711100211091010100001000000064410160101029629010000103003830038300383003830038
10024300372250000026229547251001010100001010000504277160130018300373003728286328767100102010000201000030037300371110021109101010000100000006441016010529629010000103003830038300383003830038
100243003722500000262295472510010101000010100005042771601300183003730037282863287671001020100002010000300373003711100211091010100001000000064410160101029629010000103003830038300383003830038

Test 3: throughput

Count: 8

Code:

  frintm v0.2s, v8.2s
  frintm v1.2s, v8.2s
  frintm v2.2s, v8.2s
  frintm v3.2s, v8.2s
  frintm v4.2s, v8.2s
  frintm v5.2s, v8.2s
  frintm v6.2s, v8.2s
  frintm v7.2s, v8.2s
  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)03080b18191e1f3f51inst 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)9fa0a8acc5branch mispredict (cb)cdcfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
80204200591550000001582580108100800081008002050064013220020200392003999776999080120200800322008003220039200391180201100991001008000010000311151180160120036800001002004020040200402004020040
8020420039155000000742580108100800081008002050064013220020200392003999776999080120200800322008003220039200391180201100991001008000010000011151180160020036800001002004020040200402004020040
802042003915500002705052580108100800081008002050064013220020200392003999776999080120200800322008003220039201911180201100991001008000010000011151180160020036800001002004020040200402004020040
80204200391600000003762580108100800081008002050064013220020200392019899776999080120200800322008003220039200395180201100991001008000010000011151180160020036800001002004020040200402004020040
80204200391550000001772580108100800081008002050064013220020200392003999776999080120200800322008003220039200391180201100991001008000010000311151180160020036800001002004020040200402004020040
80204200391550000001562580108100800081008002050064013220020200392003999776999080120200800322008003220039200391180201100991001008000010000011151180160020036800001002004020040200402004020040
80204200391550000001142580108100800081008002050064013220020200392003999776999080120200800322008003220039200391180201100991001008000010000011151180161020036800001002004020040200402004020040
80204200391550000005222580108100800081008002050064013220020200392003999776999080120200800322008003220039200391180201100991001008000010000011151180160020036800001002004020040200402004020040
80204200391560000003172580108100800081008002050064013220020200392003999776999080120200800322008003220039202411180201100991001008000010000011151180160020036800001002004020040200402004020040
8020420039155000000302580108100800081008002050064013220020200392003999776999080120200802412008003220039200391180201100991001008000010000011151180160020036800001002004020040200402004020040

1000 unrolls and 10 iterations

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

retire (01)cycle (02)03080a0b18191e1f3a3f51inst 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)60696b6d6edispatch 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)9fa0a1a6a8a9acc2cfd5d6dbddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
800242003915500000000402580010108000010800005064000012002002003920039999631001980010208000020800002003920039118002110910108000010000000050205160332003680000102004020040200402004020040
800242003915500000000402580010108000010800005064000002002002003920039999631001980010208000020800002003920039118002110910108000010000000050202160332003680000102004020040200402004020040
800242003915500000000632580010108000010800005064000002002002003920039999631001980010208000020800002003920039118002110910108000010000000050203160322003680000102004020040200402004020040
800242003915600000000402580010108000010800005064000012002002003920039999631001980010208000020800002003920039118002110910108000010000000050203160332003680000102004020040200402004020040
8002420039156000000004582580010108000010800005064000012002002003920039999631001980010208000020800002003920039118002110910108000010000000050203160242011880000102011520143200932004020199
8002420039156000000001772580010108000010800005064000002002002003920039999631001980010208000020800002003920039118002110910108000010000000050203160322003680000102004020040200402004020040
800242003915500000000612580010108000010800005064000002002002003920039999631001980010208000020800002003920039118002110910108000010000000050203160332003680000102004020040200402004020040
8002420039156000000001032580010108000010800005064000012002002003920039999631001980010208000020800002003920039118002110910108000010000000050203160332003680000102004020040200402004020040
8002420039155000000021072580010108000010800005064000002002002003920039999631001980010208000020800002003920039118002110910108000010000000050203160432003680000102004020040200402004020040
8002420039155000000001982580010108000010800005064000012002002003920039999631001980010208000020800002003920039118002110910108000010000000050203160332003680000102004020040200402004020040