Apple M1 Microarchitecture Research by Dougall Johnson

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

FRINTI (vector, 4H)

Test 1: uops

Code:

  frinti v0.4h, v0.4h
  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)a0a8accfd5d6ddinst fetch restart (de)e0? fp/simd (ee)f5f6f7f8fd
1004303723000145254725100010001000398160130183037303724143289510001000100030373037111001100000073316222629100030383038303830383038
100430372400061254725100010001000398160130183037303724143289510001000100030373037111001100000073216222629100030383038303830383038
1004303724000175254725100010001000398160130183037303724143289510001000100030373037111001100001073216222629100030383038303830383038
1004303724001261254725100010001000398160130183037303724143289510001000100030373037111001100001073216222629100030383038303830383038
1004303724011261254725100010001000398160130183037303724143289510001000100030373037111001100000073216222629100030383038303830383038
100430372300061254725100010001000398160130183037303724143289510001000100030373037111001100000073216222629100030383038303830383038
1004303724000149254725100010001000398160130183037303724143289510001000100030373037111001100000073216222629100030383038303830383038
1004303723000444254725100010001000398160030183037303724143289510001000100030373037111001100001073216222629100030383038303830383038
100430372400061254725100010001000398160130183037303724143289510001000100030373037111001100000073216222629100030383038303830383038
100430372300061254725100010001000398160130183037303724143289510001000100030373037111001100000073216222629100030383038303830383038

Test 2: Latency 1->2

Code:

  frinti v0.4h, v0.4h
  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)9fa1a8acc2c5branch mispredict (cb)cdcfd5d6ddinst fetch restart (de)e0? int output thing (e9)ec? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
1020430037233000000171295472510100100100001001000050042771600300183003730037282717287411010020010008200100083003730037111020110099100100100001000000111717016002964500100001003003830038300383003830038
1020430037282000000817295472510100100100001001000050042771600300183003730037282643287451010020010000200100003003730037111020110099100100100001000000000710216112963300100001003003830038300383003830038
102043003723300000061295382510100100100001001000050042771600300183003730037282643287451010020010000200100003003730037111020110099100100100001000000000710116112963300100001003003830038300383003830038
102043003723300000061295472510100100100001001000050042771600300183003730037282643287451010020010000200100003003730037111020110099100100100001000000000710116112963300100001003003830038300383003830038
1020430037232000000251295472510100100100001001000050042771601300183003730037282643287451010020010000200100003003730037111020110099100100100001000000000710116112963300100001003003830038300383003830038
102043003723200000061295472510100100100001001000050042771601300183003730037282643287451010020010000200100003003730037111020110099100100100001000100000710116112963300100001003003830038300383003830038
1020430037233000000160295472510100100100001001000050042771600300183003730037282643287451010020010000200100003003730037111020110099100100100001000000000710116112963300100001003003830038300383003830038
10204300372330001200131295472510100100100001001000050042771600300183003730037282643287451010020010000200100003003730037111020110099100100100001000000000710116112963300100001003003830038300383003830038
1020430037233000120061295472510100100100001001000050042771600300183003730037282643287451010020010000200100003003730037111020110099100100100001000000000710116112963300100001003003830038300383003830038
102043003723300000061295472510100100100001001000050042771601300183003730037282643287451010020010000200100003003730037111020110099100100100001000000000710116112969900100001003003830038300383003830038

1000 unrolls and 10 iterations

Result (median cycles for code): 3.0037

retire (01)cycle (02)030b18191e1f3f4e51inst 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)9fa0a6a8a9acc2cdcfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
100243003722500000124295472510010101000010100005042771601300183003730037282863287671001020100002010000300373003711100211091010100001000000006402162229629010000103003830038300383003830038
100243003722500000546295472510010101000010100005042771601300183003730037282863287671001020100002010000300373003711100211091010100001000000006402162229629010000103003830038300383003830038
100243003722500000444295472510010101000010100005042771601300183003730037282863287671001020100002010000300373003711100211091010100001000000006402162229629010000103003830038300383003830038
100243003722500000448295472510010101000010100005042771601300183003730037282863287671001020100002010000300373003711100211091010100001000000006402162229629010000103003830038300383003830038
100243003722500000124295472510010101000010100005042771601300183003730037282863287671001020100002010000300373003711100211091010100001000000006402162229629010000103003830038300383003830038
10024300372250000061295472510010101000010100005042771601300183003730037282863287671001020100002010000300373003711100211091010100001000000006402162229629010000103003830038300383003830038
100243003722500000191295472510010101000010100005042771601300183003730037282863287671001020100002010000300373003711100211091010100001000000006402162229629010000103003830038300383003830038
100243003722500000475295472510010101000010100005042771601300183003730037282863287671001020100002010000300373003711100211091010100001000000006402162229629010000103003830038300383003830038
100243003722500000441295472510010101000010100005042771601300183003730037282863287671001020100002010000300373003711100211091010100001000000006402162229629210000103003830038300383003830038
100243003722500000518295472510010101000010100005042771601300183003730037282863287671001020100002010000300373003711100211091010100001000000006402162229629010000103003830038300383003830038

Test 3: throughput

Count: 8

Code:

  frinti v0.4h, v8.4h
  frinti v1.4h, v8.4h
  frinti v2.4h, v8.4h
  frinti v3.4h, v8.4h
  frinti v4.4h, v8.4h
  frinti v5.4h, v8.4h
  frinti v6.4h, v8.4h
  frinti v7.4h, v8.4h
  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)03080b0e18191e1f3a3f51inst 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
8020420061160000000003025801081008000810080020500640132020020200392003999776999080120200800322008003220039200391180201100991001008000010000002000111511811600200360800001002004020040200402004020040
8020420039155000006008625801081008000810080020500640132120020200392003999776999080120200800322008003220039200391180201100991001008000010000000000111511801600200360800001002004020040200402004020040
8020420039155000000003025801081008000810080020500640132020020200392003999776999080120200800322008003220039200391180201100991001008000010000000000111511801600200360800001002004020040200402004020040
80204200391550000000069525801081008000810080020500640132120020200392003999776999080120200800322008046020039200391180201100991001008000010020000000111511801600200360800001002004020040200402004020040
8020420039156000000003025801081008000810080020500640132020020200392003999776999080120200800322008003220039200391180201100991001008000010000000000111511801600200360800001002004020040200402004020040
8020420039155008000003025801081008000810080020500640132020020200392003999776999080120200800322008003220039200391180201100991001008000010000000000111511801600200360800001002004020040200402004020040
8020420039155000000003025801081008000810080020500640132020020200392003999776999080120200800322008003220039200391180201100991001008000010000000000111511801600200360800001002004020040200402004020040
8020420039156000000003025801081008000810080020500640132020020200392003999776999080120200800322008003220039200391180201100991001008000010000000000111511801600200360800001002004020040200402004020040
8020420039156000000003025801081008000810080020500640132020020200392003999776999080120200800322028003220039200391180201100991001008000010000000000111511801600200360800001002004020040200402004020040
8020420039155000000003025801081008000810080020500640132020020200392004999776999080120200800322008003220039200391180201100991001008000010000000000111511801600200360800001002004020040200402004020040

1000 unrolls and 10 iterations

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

retire (01)cycle (02)030b1e3a3f51inst 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)5f60696d6edispatch 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)9fa1a6a8acc2cfd2icache miss (d3)d5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
8002420176156000483258001010800001080000506400000020109200392003999963100198021520802142080000200392003911800211091010800001000060502005316362007580000102015020093200892004020040
80024200391550132040258001010800001080000506400000120020200392003999963100198001020800002080000200392003911800211091010800001000000502000316232003680000102004020040200402004020040
800242003915500040258001010800001080000506400000120020200392003999963100198001020800002080000201932003911800211091010800001000000502010316322003680000102004020040200402004020040
800242003915500040258001010800001080000506400000120020200392003999963100198001020800002080000200392003911800211091010800001000000502000316232003680000102004020040200402004020040
800242003915500040258001010800001080000506400000120020200392003999963100198001020800002080000200392003911800211091010800001000000502000316322003680000102004020040200402004020040
800242003915500040258001010800001080000506400000120020200392003999963100198001020800002080000200392003911800211091010800001000000502000316232003680000102004020040200402004020040
8002420039155000402580010108000010800005064000001200202003920039999631001980010208000020800002003920039118002110910108000010000570502000416322003680000102004020040200402004020040
800242003915500040258001010800001080000506400000120020200392003999963100198001020800002080414200392003911800211091010800001000000502000316332007580000102004020040200402004020093
8002420039155000406080010108000010801065064000011200202003920039100057100198032220801062080000200392003911800211091010800001000100502000216332013080000102004020040200932010520040
800242003915600040258001010800001080000506400000020020200392003999963100198001020800002080000200392003911800211091010800001000000502000316322003680000102004020040200402004020040