Apple M1 Microarchitecture Research by Dougall Johnson

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

SUBHN (vector, 2D)

Test 1: uops

Code:

  subhn v0.2s, v0.2d, v1.2d
  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)03181e3f4e51inst 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
1004303723006125482510001000100039831303018303730372415328951000100020003037303711100110000073116112630100030383038303830383038
100430372302406125482510001000100039831303018303730372415328951000100020003037303711100110000073116112630100030383038303830383038
1004303722006125482510001000100039831303018303730372415328951000100020003037303711100110000073116112630100030383038303830383038
1004303723006125482510001000100039831303018303730372415328951000100020003037303711100110000073116112630100030383038303830383038
10043037230061254825100010001000398313030183037303724153289510001000200030373037111001100006073116112630100030383038303830383038
1004303723006125482510001000100039831303018303730372415328951000100020003037303711100110000073116112630100030383038303830383038
1004303722006125482510001000100039831303018303730372415328951000100020003037303711100110000073116112630100030383038303830383038
10043037230061254825100010001000398313030183037303724153289510001000200030373037111001100051373116112630100030383038303830383038
10043037220984254825100010001000398313030183037303724153289510001000200030373037111001100019073116112630100030383038303830383038
1004303723006125482510001000100039831303018303730372415328951000100020003037303711100110000073116112630100030383038303830383038

Test 2: Latency 1->2

Code:

  subhn v0.2s, v0.2d, v1.2d
  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)0308191e1f3f4e51inst 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)9fa8accfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
10204300372250000612954825101001001000010010000500427731313001803003730037282653287451010020010000200200003003730037111020110099100100100001001071011611296340100001003003830038300383003830038
102043003722500001362954825101001001000010010000500427731313001803003730037282653287451010020010000200200003003730037211020110099100100100001000071011611296340100001003003830038300383003830038
10204300372240000612954825101001001000010010000500427731313001803003730037282653287451010020010000200200003003730037111020110099100100100001000071011611296340100001003003830038300383003830038
10204300372250000612954825101001001000010010000500427731303001803003730037282653287451010020010000200200003003730037111020110099100100100001000071011611296340100001003003830038300383003830038
10204300372250000612954825101001001000010010000500427731303001803003730037282653287451010020010000200200003003730037111020110099100100100001000071011611296340100001003003830038300383003830038
10204300372250000612954825101001001000010010000500427731303001803003730037282653287451010020010000200200003003730037111020110099100100100001000071011611296340100001003003830038300383003830038
10204300372250000612954825101001001000010010000500427731313001803003730037282653287451010020010000200200003003730037111020110099100100100001000071011611296340100001003003830038300383003830038
10204300372250000612954825101001001000010010000500427731303001803003730037282653287451010020010000200200003003730037111020110099100100100001000071011611296343100001003008530038300383003830038
10204300372240000612954825101001001000010010000500427731313001803003730037282653287451010020010000200200003003730037111020110099100100100001000071011611296340100001003003830038300383003830038
10204300372250000612954825101001001000010010000500427731303001803003730037282653287451010020010000200200003003730037111020110099100100100001000071011611296340100001003003830038300383003830038

1000 unrolls and 10 iterations

Result (median cycles for code): 3.0037

retire (01)cycle (02)030809191e3f4e51inst 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)9fa1a6a8acc2cfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
10024300372250000612954825100101010000101000050427731303001830037300372828732876710012201000020200003003730037111002110910101000010000006404162229630210000103003830038300383003830038
100243003722500003592954825100101010000101000050427731303001830037300372828732876710010201000020200003003730037111002110910101000010001306402162229630010000103003830228300383013330038
1002430131225000451702954825100101210000121000050427731303001830037300372828732884310010201000020203243003730131311002110910101000010221551826814403429630210000103003830132301803013230227
1002430181226111267612954825100101010000101000050427731303001830037300372828732876710010201000020200003003730037111002110910101000010000006403162229630010000103003830038300383003830038
10024300372250000612954825100101010000101000050427731303001830037300372828732876710010201000020200003003730037111002110910101000010000006422162229630010000103003830038300383003830038
10024300372250100612954825100121210000101000050427731303001830037300372828732876710010201000020200003003730037111002110910101000010000006402162229630010000103003830038300383003830038
10024300372250000612954825100101010000101000050427731303001830037300372828732876710010201000020200003003730037111002110910101000010000006402162229630010000103003830038301343003830038
10024300372250000612954825100101010000101000050427731303001830037300372828732876710010201000020200003003730037111002110910101000010000006402162229630010000103003830038300383003830038
10024300372250000822954825100101010000101000050427731303001830037300372828732876710010201000020200003003730037111002110910101000010000006402162229630010000103003830038300383003830038
10024300372250000612954825100101010000101000050427731303001830037300372828732876710010201000020200003003730037111002110910101000010000006424162229630010000103003830038300383003830038

Test 3: Latency 1->3

Code:

  subhn v0.2s, v1.2d, 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)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? int output thing (e9)eb? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
102043003722506129548251010010010000100100005004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100000710216222963400100001003003830038300383003830038
102043003722506129548251010010010000100100005004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100000710216222963400100001003003830038300383003830038
1020430037224010229548251010010010000100100005004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100000710216222963400100001003003830038300383003830038
102043003722506129548251010010010000100100005004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100000710216222963400100001003003830038300383003830038
102043003722506129548251010010010000100100005004277313130018300373003728265328745101002001000020020000300373003711102011009910010010000100000710216222963400100001003003830038300383003830038
1020430037225077029548251010010010000100100005004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100000710216222963400100001003003830038300383003830038
102043003722506129548251010010010000100100005004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100000710216222963400100001003003830038300383003830038
102043003722506129548251010010010000100100005004277313130018300373003728265328745101002001000020020000300373003711102011009910010010000100000710216222963400100001003003830038300383003830038
102043003722506129548251010010010000100100005004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100000710216222963400100001003003830038300383003830038
102043003722506129548251010010010000100100005004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100000710216222963400100001003003830038300383003830038

1000 unrolls and 10 iterations

Result (median cycles for code): 3.0037

retire (01)cycle (02)030b181e3f4e51inst 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)9fa8accfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
10024300372250007262954825100101010000101000050427731313001830037300372828732876710010201000020200003003730037111002110910101000010006402162229630010000103003830038300383003830038
10024300372250004072954825100101010000101000050427731303001830037300372828732876710010201000020200003003730037111002110910101000010006402162229630010000103003830038300383003830038
1002430037225000612954825100101010000101000050427731313001830037300372828732876710010201000020200003003730037111002110910101000010036402162229630010000103003830038300383003830038
10024300372250001262954825100101010000101000050427731313001830037300372828732876710010201000020200003003730037111002110910101000010006402162229630010000103003830038300383003830038
10024300372241008932954825100101010000101000050427731303001830037300372828732876710010201000020200003003730037111002110910101000010106402162229630010000103003830038300383003830038
10024300372250001662954825100101010000101000050427731313001830037300372828732876710010201000020200003006030037111002110910101000010006402162229630010000103003830038300383003830038
10024300372250001452954825100101010000101000050427731303001830037300372828732876710010201000020200003003730037111002110910101000010006402162229630010000103003830038300383003830038
10024300372250007892954825100101010000101000050427731313001830037300372828732876710010201000020200003003730037111002110910101000010006402162229630010000103003830038300383003830038
10024300372250008102954825100101010000101000055427867013005430084300852829132878710010201000020200003003730037111002110910101000010006402162229630010000103003830038300383003830038
1002430037225000612954825100101010000101000050427731303001830037300372828732876710010201000020200003003730037111002110910101000010006402162229630010000103003830038300383003830038

Test 4: throughput

Count: 8

Code:

  subhn v0.2s, v8.2d, v9.2d
  subhn v1.2s, v8.2d, v9.2d
  subhn v2.2s, v8.2d, v9.2d
  subhn v3.2s, v8.2d, v9.2d
  subhn v4.2s, v8.2d, v9.2d
  subhn v5.2s, v8.2d, v9.2d
  subhn v6.2s, v8.2d, v9.2d
  subhn v7.2s, v8.2d, v9.2d
  movi v8.16b, 9
  movi v9.16b, 10

(fused SUBS/B.cc loop)

100 unrolls and 100 iterations

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

retire (01)cycle (02)033f51inst 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)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)9fa8cfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
8020420048150632580100100800001008000050064000020020200392003999730399978010020080000200160000200392003911802011009910010080000100151102161120036800001002004020040200402004020040
80204200391501502580100100800001008000050064000020020200392003999730399978010020080000200160000200392003911802011009910010080000100051101161120036800001002004020040200402004020040
8020420039150412580100100800001008000050064000020020200392003999730399978010020080000200160000200392003911802011009910010080000100051101161120036800001002004020040200402004020040
8020420039150412580100100800001008000050064000020020200392003999730399978010020080000200160000200392003911802011009910010080000100051101161120036800001002004020040200402004020040
8020420039150412580100100800001008000050064000020020200392003999730399978010020080000200160000200392003911802011009910010080000100051101161120036800001002004020040200402004020040
8020420039151412580100100800001008000050064000020020200392003999730399978010020080000200160000200392003911802011009910010080000100051101161120036800001002004020040200402004020040
8020420039150412580100100800001008000050064000020020200392003999730399978010020080000200160000200392003911802011009910010080000100051101161120036800001002004020040200402004020040
8020420039150412580100100800001008000050064000020020200392003999730399978010020080000200160000200392003911802011009910010080000100051101161120036800001002004020040200402004020040
8020420039150412580100100800001008000050064000020020200392003999730399978010020080000200160000200392003911802011009910010080000100051101161120036800001002004020040200402004020040
8020420039150622580100100800001008000050064000020020200392003999730399978010020080000200160000200392003911802011009910010080000100051101161120036800001002004020040200402004020040

1000 unrolls and 10 iterations

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

retire (01)cycle (02)03081e3a3f51inst 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)9fa8accfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
80024200481500006125800101080000108000050640000120020200392003999963100198001020800002016000020039200391180021109101080000100050333116282520036080000102004020040200402004020040
800242003915000040258001010800961080000506400001200202003920039999631001980010208000020160000200392003911800211091010800001042050412816222920036080000102004020040200402004020040
800242003915000010525800101080000108000050640000120020200392003999963100198001020800002016000020039200391180021109101080000100050372816212820036080000102004020040200402004020040
80024200391500004025800101080000108000050640000020020200392003999963100198001020800002016000020039200391180021109101080000100050372516172820036080000102004020040200402004020040
80024200391500004025800101080000108000050640000020020200392003999963100198001020800002016000020039200391180021109101080000100050432616282720036080000102004020040200402004020040
80024200391500004025800101080000108000050640000120020200392003999963100198001020800002016000020039200391180021109101080000100050372816292620036080000102004020040200402004020040
80024200391500004025800101080000108000050640000120020200392003999963100198001020800002016000020039200391180021109101080000100050401316271520036080000102004020040200402004020040
80024200391500006325800101080000108000050640000120020200392003999963100198001020800002016000020039200391180021109101080000100050372816292220036080000102004020040200402004020040
80024200391500004025800101080000108000050640000120020200392003999963100198001020800002016000020039200391180021109101080000100050372816292920036080000102004020040200402004020040
80024200391500004025800101080000108000050640000120020200392003999963100198001020800002016000020039200391180021109101080000100050372416212420036080000102004020040200402004020040