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, 4H)

Test 1: uops

Code:

  frintz 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)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
100430372306125472510001000100039816013018303730372414328951000100010003037303711100110000373116112629100030383038303830383038
100430372296125472510001000100039816013018303730372414328951000100010003037303711100110000073116112629100030383038303830383038
100430372306125472510001000100039816013018303730372414328951000100010003037303711100110000373116112629100030383038303830383038
100430372206125472510001000100039816013018303730372414328951000100010003037303711100110005073116112629100030383038303830383038
100430372206125472510001000100039816013018303730372414328951000100010003037303711100110000073116112629100030383038303830383038
100430372312103254725100010001000398160130183037303724143289510001000100030373037111001100004273116112629100030383038303830383038
1004303722129125472510001000100039816013018303730372414328951000100010003037303711100110000073116112629100030383038303830383038
100430372366125472510001000100039816013018303730372414328951000100010003037303711100110000073116112629100030383038303830383038
100430372366125472510001000100039816013018303730372414328951000100010003037303711100110000073116112629100030383038303830383038
100430372206125472510001000100039816013018303730372414328951000100010003037303711100110000073116112629100030383038303830383038

Test 2: Latency 1->2

Code:

  frintz 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)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)9fa8a9accfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
1020430037225121032954725101001001000010010000500427716013001830037300372826432874510100200100002001000030037300371110201100991001001000010010457101161129633100001003003830038300383003830038
1020430037224010329547251010010010000100100005004277160130018300373003728264328745101002001000020010000300373003711102011009910010010000100501807101161129633100001003003830038300383003830038
102043003722512880295472510100100100001001000050042771601300183003730037282643287451010020010000200100003003730037111020110099100100100001001097101161129633100001003003830038300383003830038
102043003722512103295472510100100100001001000050042771601300183003730037282643287451010020010000200100003003730037111020110099100100100001008027837101161129633100001003003830038300383003830038
102043003722512612954725101001001000010010000500427716013001830037300372826432874510100200100002001000030037300371110201100991001001000010028067101161129633100001003003830038300383003830038
1020430037225010329547251010010010000100100005004277160130018300373003728264328745101002001000020010000300373003711102011009910010010000100540157101161129633100001003003830038300383003830038
10204300372250103295472510100100100001001000050042771601300183003730037282643287451010020010000200100003003730037111020110099100100100001004007101161129633100001003003830038300383003830038
102043003722512612954725101001001000010010000500427716013001830037300372826432874510100200100002001000030037300371110201100991001001000010034067101161129633100001003003830038300383003830038
1020430037225127682954725101001001000010010000500427716013001830037300372826432874510100200100002001000030037300371110201100991001001000010032084617101161129633100001003008530038300383003830038
102043003722412103295472510100100100001001000050042771600300183003730037282643287451010020010000200100003003730037111020110099100100100001002097101161129633100001003003830038300383003830038

1000 unrolls and 10 iterations

Result (median cycles for code): 3.0037

retire (01)cycle (02)030918191e1f3f4e51inst 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)9fa0a1a6a8a9acc2cfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
100243003722500000612954725100101010000101000050427716003001830037300372828632876710010201000020100003003730037111002110910101000010000002406402162229629010000103003830038300383003830038
100243003722500000612954725100101010000101000050427716003001830037300372828632876710010201000020100003003730037111002110910101000010000008406402162229629010000103003830038300383003830038
100243003722500000612954725100101010000101000050427716003001830037300372828632876710010201000020100003003730037111002110910101000010000008706402162229629010000103003830038300383003830038
100243003722500000612954725100101010000101000050427716003001830037300372828632876710010201000020100003003730037111002110910101000010000003006402162229629010000103003830038300383003830038
100243003722500000612954725100101010000101000050427716003001830037300372828632876710010201000020100003003730037111002110910101000010000002406402162229629010000103003830038300383003830038
100243003722500000612954725100101010000101000050427716003001830037300372828632876710010201000020100003003730037111002110910101000010000101206402162229629010000103003830038300383003830038
100243003722500000612954725100101010000101000050427716003001830037300372828632876710010201000020100003003730037111002110910101000010000003306402162229629010000103003830038300383003830038
100243003722500000612954725100101010000101000050427716003001830037300372828632876710010201000020100003003730037111002110910101000010000005706402162229629010000103003830038300383003830038
100243003722500000612954725100101010000101000050427716003001830037300372828632876710010201000020100003003730037111002110910101000010000004506402162229629010000103003830038300383003830038
10024300372240000061295472510010101000010100005042771600300183003730037282863287671001020100002010000300373003711100211091010100001000000906402162229629010000103003830038300383003830038

Test 3: throughput

Count: 8

Code:

  frintz v0.4h, v8.4h
  frintz v1.4h, v8.4h
  frintz v2.4h, v8.4h
  frintz v3.4h, v8.4h
  frintz v4.4h, v8.4h
  frintz v5.4h, v8.4h
  frintz v6.4h, v8.4h
  frintz 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)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)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)9fa0a8acc2c5branch mispredict (cb)cdcfd5d6inst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
802042003915012348258010810080008100800205006401320200200200392003999776999080120200800322008003220039200391180201100991001008000010000301115118216020036800001002004020040200402004020040
80204200391501272258010810080008100800205006401320200200200392003999776999080120200800322008003220039200391180201100991001008000010000301115118016020036800001002004020040200402004020040
80204200391501272258010810080008100800205006401320200203200392003999776999080120200800322008003220039200391180201100991001008000010001301115118016020036800001002004020040200402004020040
8020420039150072258010810080008100800205006401320200200200392003999776999080120200800322008003220039200391180201100991001008000010001301115118116020036800001002004020040200402004020040
8020420039150072258010810080008100800205006401320200200200392003999776999080120200800322008003220039200391180201100991001008000010000301115118016020036800001002004020040200402004020040
80204200391501272258010810080008100800205006401320200200200392003999776999080120200800322008003220039200391180201100991001008000010001301115118116020036800001002004020040200922004020154
80204200391501272258010810080008100800205006401320200200200392003999776999080120200800322008003220039200391180201100991001008000010001301115118016020036800001002004020040200402004020040
80204200391501272258010810080008100800205006401320200200200392003999776999080120200800322008003220039200391180201100991001008000010001301115118016020036800001002004020040200402004020040
80204200391501272258010810080008100800205006401320200200200392003999776999080120200800322008003220039200391180201100991001008000010000301115118116020036800001002004020040200402004020040
80204200391501272258010810080008100800205006401320200200200392003999776999080120200800322008003220039200391180201100991001008000010000001115118016020036800001002004020040200402004020040

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)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)9fa0a8a9accfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
80024200511500402580010108000010800005064000001200202003920039999631001980010208000020800002003920039118002110910108000010000050201016542003680000102004020040200402004020040
80024200391500705258001010800001080000506400000120020200392003999963100198001020800002080000200392003911800211091010800001000005020816572003680000102004020040200402004020040
8002420039150040258001010800001080000506400000120020200392003999963100198001020800002080000200392003911800211091010800001000005020916772003680000102004020040200402004020040
80024200391500402580010108000010800005064000000200202003920039999631001980010208000020800002003920039118002110910108000010000050201016542003680000102004020040200402004020040
8002420039150040258001010800001080000506400000120020200392003999963100198001020800002080000200392003911800211091010800001000005020716552003680000102004020040200402004020040
8002420039150040518001010800001080000506400000120020200392003999963100198001020800002080000200392003911800211091010800001000005020516562003680000102004020040200402004020040
8002420039150040258001010800001080000506400000020020200392003999963100198001020800002080000200392003911800211091010800001000005020916752003680000102004020040200402004020040
8002420039150061258001010800001080000506400000120020200392003999963100198001020800002080000200392003911800211091010800001000005020816542003680000102004020040200402004020040
8002420039150040258001010800001080000506400000020020200392003999963100198001020800002080000200392003911800211091010800001000005020316662003680000102004020040200402004020040
8002420039150040258001010800001080000506400000120020200392003999963100198001020800002080000200392003911800211091010800001000005020716552003680000102004020040200402004020040