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, 2D)

Test 1: uops

Code:

  frintm v0.2d, v0.2d
  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)03081e3f4e51inst issue (52)~issue fp/simd (54)~dispatch fp/simd (57)huge thing fp/simd (5b)696d6edispatch 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
100430372300612547251000100010003981603018303730372414328951000100010003037303711100110001073316332629100030383038303830383038
1004303723091032547251000100010003981603018303730372414328951000100010003037303711100110000073316332629100030383038303830383038
1004303723012612547251000100010003981603018303730372414328951000100011623037303711100110000073316332629100030383038303830383038
1004303723001152547251000100010003981603018303730372414328951000100010003037303711100110000073316332629100030383038303830383038
100430372400612547251000100010003981603018303730372414328951000100010003037303711100110000073316332629100030383038303830383038
10043037230285612547251000100010003981603018303730372414328951000100010003037303711100110000073316332629100030383038303830383038
100430372400612547251000100010003981603018303730372414328951000100010003037303711100110000073316442626100030383038303830383038
10043037230147612547251000100010003981603018303730372414328951000100010003037303711100110000073316332629100030383038303830383038
100430372300612547251000100010003981603018303730372414328951000100010003037303711100110000073316332629100030383038303830383038
100430372400612547251000100010003981603018303730372414328951000100010003037303711100110000073316332629100030383038303830383038

Test 2: Latency 1->2

Code:

  frintm v0.2d, v0.2d
  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)031e3a3f4e51inst 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)9fa3a8acc2cfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
1020430037232006129547251010010010000100100005004277160030018030037300372826432874510100200100002001000030037300371110201100991001001000010000007101161129633100001003003830038300383003830038
1020430037232006129547251010010010000100100005004277160030018030037300372826432874510100200100002001000030037300371110201100991001001000010000007101161129633100001003003830038300383003830038
1020430037233006129547251010010010000100100005004277160030018030037300372826432874510100200100002001000030037300371110201100991001001000010000007101161129633100001003003830038300383003830038
1020430037233006129547251010010010000100100005004277160030018030037300372826432874510100200100002001000030037300371110201100991001001000010000007101161129633100001003003830038300383003830038
1020430037232006129547251010010010000100100005004277160030018030037300372827132874510100200100002001000030037300371110201100991001001000010000007102161129633100001003003830038300383003830038
1020430037233006129547251010010010000100100005004277160030018030037300372826432874510100200100002001000030037300371110201100991001001000010000007101161129633100001003003830038300383003830038
1020430037233006129547251010010010000100100005004277160030018030037300372826432874510100200100002001000030037300371110201100991001001000010000007101161129633100001003003830038300383003830038
1020430037233006129547251010010010000100100005004277160030018030037300372826432874510100200100002001000030037300372110201100991001001000010000007101161129633100001003003830038300383003830038
1020430037232006129547251010010010000100100005004277160030018030037300372826432874510100200100002001000030037300371110201100991001001000010000007101161129705100001003003830038300383003830038
1020430037233006129547251010010010000100100005004277160030018030037300372826432874510100200100002001000030037300371110201100991001001000010000007101161129633100001003003830038300383003830038

1000 unrolls and 10 iterations

Result (median cycles for code): 3.0037

retire (01)cycle (02)0304181e3f4e51inst 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)9fa0a1a6a8accdcfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
1002430037225100612954725100101010000101000050427716003001830037300372828632876710010201000020100003003730037111002110910101000010000000640216222962910000103003830038300383003830038
1002430037225000612954725100101010000101000050427716003001830037300372828632876710010201000020100003003730037211002110910101000010000000640216222962910000103003830038300383008530038
10024300372250007262954725100101010000101000050427716003001830037300372828632876710010201000020100003003730037111002110910101000010000000640216222962910000103003830038300383003830038
1002430037225000612954725100101010000101000050427716003001830226300372828632876710010201000020100003003730037111002110910101000010000000640216222962910000103003830038300383003830038
10024300372250007262954725100101010000101000050427716003001830037300372828632876710010201000020100003003730037111002110910101000010000000640216222962910000103003830038300383003830038
10024300372250007262954725100101010000101000050427716003001830037300372828632876710010201000020100003003730037111002110910101000010000001640216222962910000103003830038300383003830038
1002430037225000612954725100101010000101000050427716003001830037300372828632876710010201000020100003003730037111002110910101000010000000640216222962910000103003830038300383003830038
1002430037225000612954725100101010000101000050427716003001830037300372828632876710010201000020100003003730037111002110910101000010000000640216222962910000103003830038300383003830038
1002430037225000612954725100101010000101000050427716003001830084300372828632876710010201000020100003003730037111002110910101000010000000640216222962910000103003830038300383003830038
1002430037225000612954725100101010000101000050427716003001830037300372828632876710010201000020100003003730037111002110910101000010000000640216222962910000103003830038300383003830038

Test 3: throughput

Count: 8

Code:

  frintm v0.2d, v8.2d
  frintm v1.2d, v8.2d
  frintm v2.2d, v8.2d
  frintm v3.2d, v8.2d
  frintm v4.2d, v8.2d
  frintm v5.2d, v8.2d
  frintm v6.2d, v8.2d
  frintm v7.2d, v8.2d
  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)9facc5branch mispredict (cb)cdcfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
8020420071155050525801081008000810080020500640132120020200392003999776999080120200800322008003220039200391180201100991001008000010036111511801610200360800001002004020040200402004020040
802042003915512302580108100800081008002050064013212002020039200399977699908012020080032200800322003920039118020110099100100800001000111511801600200360800001002004020040200402004020040
802042003916101162580108100800081008002050064013212002020039200399977699908012020080032200800322003920039118020110099100100800001000111511801600200360800001002004020040200402004020040
802042003915501042580108100800081008002050064013212002020039200399977699908012020080032200800322003920039118020110099100100800001000111511801600200360800001002004020040200402004020040
80204200391550302580108100800081008002050064013202002020039200399977699908012020080032200800322003920039118020110099100100800001000111511801600200360800001002004020040200402004020040
802042003915502042580108100800081008002050064013202002020039200399977699908012020080032200800322003920039118020110099100100800001003111511801600200360800001002004020040200402004020040
80204200391550302580108100800081008002050064013212002020039200399977699908012020080032200800322003920039118020110099100100800001000111511801600200360800001002004020040200402004020040
802042003915612532580108100800081008002050064013212002020039200399977699908012020080032200800322003920039118020110099100100800001000111511801600200360800001002004020040200402004020040
802042003915502062580108100800081008002050064013202002020039200399977699908012020080032200800322003920039118020110099100100800001003111511801600200360800001002004020040200402004020040
80204200391550302580108100800081008002050064013202002020039200399977699908012020080032200800322003920039118020110099100100800001000111511801600200360800001002004020040200402004020040

1000 unrolls and 10 iterations

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

retire (01)cycle (02)03070818191e3f51inst 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)72scheduler 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)9fa1a6a8acc5cfd0d2icache miss (d3)d5d6d9dadbddinst fetch restart (de)e0eb? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
800242005015600000102258001010800001080000506400000120020200392003999960310019800102080000208000020039200391180021109101080000100000050200004160005420036080000102004020040200402004020040
80024200391550000054258001010800001080000506400000020020200392003999960310019800102080000208000020039200391180021109101080000100000050200006160006720036080000102004020040200402004020040
80024200391550000040258001010800001080000506400000020020200392003999960310019800102080000208000020039200391180021109101080000100000050200005160005420036080000102004020040200402004020040
80024200391560000040258001010800001080000506400000020020200392003999960310019800102080000208000020039200391180021109101080000100000050200006160006520036080000102004020040200402004020040
800242003915500000103258001010800001080000506400000020020200392003999967310019800102080000208000020039200391180021109101080000100000050200006160006520036080000102004020040200402004020040
800242003915500000600258001010800001080000506400000020020200392003999960310019800102080000208000020039200391180021109101080000100000050200005160007620036080000102004020040200402004020040
8002420039156000021633258001010800001080000506400000020020200392003999960310019800102080000208000020039200391180021109101080000100000050200005160007520036080000102004020040200402004020040
80024200391550000340258001010800001080000506400000020020200392003999960310019800102080000208000020039200391180021109101080000100010050200005160006520036080000102004020040200402004020040
80024200391550000040258001010800001080000506400000020020200392003999960310019800102080000208000020039200391180021109101080000100000050200005160005520036080000102004020040200402004020040
80024200391550000040258001010800001080000506400000020020200392003999960310019800102080000208000020039200391180021109101080000100000050200004160006620036080000102004020040200402004020040