Apple M1 Microarchitecture Research by Dougall Johnson

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

SQADD (vector, 4S)

Test 1: uops

Code:

  sqadd v0.4s, v0.4s, v1.4s
  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)0318191e1f3f4e51inst 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
100430372200006125482510001000100039831313018303730372415328951000100020003037303711100110000073116112630100030383038303830383038
100430372300198012125482510001000100039831313018303730372415328951000100020003037303711100110000073116112823100030383038303830383038
10043037230023406125482510001000100039831313018303730372415328951000100020003037303711100110001073116112630100030383038303830383038
100430372200006125482510001000100039831313018303730372415328951000100020003037303711100110000073116112630100030383038303830383038
1004303723000010325482510001000100039831313018303730372415328951000100020003037303711100110000073116112630100030383038303830383038
100430372300006125482510001000100039831313018303730372415328951000100020003037303711100110000073116112630100030383038303830383038
100430372200006125482510001000100039831313018303730372415328951000100020003037303711100110000073116112630100030383038303830383038
100430372300006125482510001000100039831313018303730372415328951000100020003037303711100110000073116112630100030383038303830383038
1004303723003906125482510001000100039831313018303730372415328951000100020003037303711100110000073116112630100030383038303830383038
1004303722001206125482510001000100039831313018303730372415328951000100020003037303711100110000973116112630100030383038303830383038

Test 2: Latency 1->2

Code:

  sqadd v0.4s, v0.4s, v1.4s
  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)9fa0a8acc2cdcfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
1020430037225012629548251010010010000100100005004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100000007101161129634100001003003830038300383003830038
102043003722506129539451010010010000100100005004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100000007101161129634100001003003830038300383003830038
10204300372254512629548251010010010000100100005004277313130018300373003728265328745101002001000020020000300373003711102011009910010010000100000007101161129634100001003003830038300383003830038
102043003722506129548251010010010000100100005004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100000007101161129634100001003003830038300383003830038
1020430037225014529548251010010010000100100005004277313130018300373003728265328745101002001000020020000300373003711102011009910010010000100000007101161129634100001003003830038300383003830038
102043003722406129548251010010010000100100005004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100000007101161129634100001003003830038300383003830038
1020430037225014729548251010010010000100100005004277313130018300373003728265328745101002001000020020000300373003711102011009910010010000100000007101161129634100001003003830038300383003830038
102043003722506129548251010010010000100100005004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100000007101161129634100001003003830038300383003830038
102043003722506129548251010010010000100100005004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100210007101161129634100001003003830038300383003830038
102043003722506129530251010010010000100100005004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100000007101161129634100001003003830038300383003830038

1000 unrolls and 10 iterations

Result (median cycles for code): 3.0037

retire (01)cycle (02)03070b1e3f4e51inst 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)9fa8acc5cfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
100243003722500084295482510010101000010100005042773130300180300373003728287328767100102010000202000030037300371110021109101010000100006402162229630010000103003830038300383003830038
1002430037225000346295482510010101000010100005042773130300180300373003728287328767100102010000202000030037300371110021109101010000100006402162229630010000103003830038300383003830038
1002430037225100835295482510010101000010100005042773131300180300373003728287328767100102010000202000030037300371110021109101010000100006402162229630010000103003830038300383003830038
1002430037225100105295482510010101000010100005042773130300180300373003728287328767100102010000202000030037300371110021109101010000100006422162229630210000103003830038300383003830038
100243003722500061295482510010101000010100006042773130300180300373003728287328767100102010000202000030037300371110021109101010000100006402162229630010000103003830038300383003830038
1002430037225000168295482510020101000010100005042773130300180300373003728287328767100102010000202000030037300371110021109101010000100006402162229630010000103003830038300383003830038
1002430037225000191295482510010101000010100005042773130300180300373003728287328767100102010000202000030037300371110021109101010000100006402162229630010000103003830038300383003830038
100243003722500061295482510010101000010100005042773130300180300373003728287328767100102010000202000030037300371110021109101010000100006402162229630210000103003830038300383003830038
1002430037225000229295482510010101000010100005042773130300183300373003728287328767100102010000202000030037300371110021109101010000100006402162229630010000103003830038300383003830038
1002530037225000342295482510010101000010100005042773130300180300373003728287328767100102010000202000030037300371110021109101010000100006402162229630010000103003830038300383003830038

Test 3: Latency 1->3

Code:

  sqadd v0.4s, v1.4s, v0.4s
  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)03080b1e3a3f4e51inst 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)9fa6a8cdcfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
102043003722500011242954825101001001000010010000500427731303001830037300372826532874510100200100002002000030084300371110201100991001001000010000071051725296340100001003003830038300383003830038
10204300372250000612954825101001001000010010000500427731303001830037300372826532874510100200100002002000030037300371110201100991001001000010000071011611296340100001003003830038300383003830038
102043003722500150612954825101001001000010010000626427731303001830037300372826532874510100200100002002000030037300371110201100991001001000010000071011611296340100001003003830038300383003830038
10204300372240000612954825101251251000012510000626427731303001830037300372826532874510100200100002002000030037300371110201100991001001000010000071451715296340100001003003830038300383003830038
10204300372250001612954825101001001000010010000500427731313001830037300372826532874510100200100002002000030037300371110201100991001001000010000071011611296340100001003003830038300383003830038
10204300372240001612954825101001001000010010000500427731303001830037300372826532874510100200100002002000030037300371110201100991001001000010000071011611296340100001003003830038300383003830038
10204300372250000612954825101001001000010010000500427731303001830037300372826532874510100200100002002000030037300371110201100991001001000010000071011611296340100001003003830038300383003830038
102043003722500001452954825101251251000012510000626427731303001830037300372826532874510100200100002002000030037300371110201100991001001000010000071011611296340100001003003830038300383003830038
10204300372250000612954825101001001000010010000500427731303001830037300372826532874510100200101762002000030037300371110201100991001001000010000071011611296340100001003003830038300383003830038
10204300372250000612954825101001001000010010000500427731303001830037300372826532874510100200100002002000030037300371110201100991001001000010000071011611296340100001003003830038300383003830038

1000 unrolls and 10 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)9fa1a6a8a9accdcfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
100243003722501452954825100101010000101000050427731313001830037300372828732876710010201000020200003003730037111002110910101000010000000640316222963010000103003830038300383003830038
10024300372250612954825100101010000101000050427731303001830037300372828732876710010201000020200003003730037111002110910101000010000000640216222963010000103008230038300383003830038
100243003722501032954825100101010000101000050427731303001830037300372828732876710010201000020200003003730037111002110910101000010000000640216222963010000103003830038300383003830038
100243003722401032954825100101010000101000050427731303001830037300372828732876710010201000020200003003730037111002110910101000010000000640216222963010000103003830038300383003830038
10024300372250612954825100101010000101000050427731303001830037300372828732876710010201000020200003003730037111002110910101000010000000640216222963010000103003830038300383003830038
100243003722502542954825100101010000101000050427731303001830037300372828732876710010201000020200003003730037111002110910101000010000100640216222963010000103003830038300383003830038
10024300372250612954825100101010000101000050427731303001830037300372828732876710010201000020200003003730037111002110910101000010000000640216222963010000103003830038300383003830038
10024300372250612954825100101010000101000050427731303001830037300372828732876710010201000020200003003730037111002110910101000010000000640216222963010000103003830038300383003830038
10024300372250612954825100101010000101000050427731303001830037300372828732876710010201000020200003003730037111002110910101000010000000640216222963010000103003830038300383003830038
10024300372250612954825100101010000101000050427731303001830037300372828732876710010201000020200003003730037111002110910101000010000000640216222963010000103003830038300383003830038

Test 4: throughput

Count: 8

Code:

  sqadd v0.4s, v8.4s, v9.4s
  sqadd v1.4s, v8.4s, v9.4s
  sqadd v2.4s, v8.4s, v9.4s
  sqadd v3.4s, v8.4s, v9.4s
  sqadd v4.4s, v8.4s, v9.4s
  sqadd v5.4s, v8.4s, v9.4s
  sqadd v6.4s, v8.4s, v9.4s
  sqadd v7.4s, v8.4s, v9.4s
  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)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)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)9fa0a1a6a7a8a9accfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
8020420039150083258010010080000100800005006400000200200200392003999730399978010020080000200160000200392003911802011009910010080000100000000051102161120036800001002004020040200402004020040
8020420039150041258010010080000100800005006400000200200200392003999730399978010020080000200160000200392003911802011009910010080000100000000051101161120036800001002004020040200402004020040
8020420039150041258010010080000100800005006400000200200200392003999730399978010020080000200160000200392003911802011009910010080000100000000051101161120036800001002004020040200402004020040
8020420039150041258010010080000100800005006400001200200200392003999730399978010020080000200160000200392003911802011009910010080000100000000051101161120036800001002004020040200402004020040
8020420039150062258010010080000100800005006400001200200200392003999730399978010020080000200160000200392003911802011009910010080000100000000051101161120036800001002004020040200402004020040
8020420039150062258010010080000100800005006400000200200200392003999730399978010020080000200160000200392003911802011009910010080000100000000051101161120036800001002004020040200402004020040
8020420039150041258010010080000100800005006400000200200200392003999730399978010020080000200160000200392003911802011009910010080000100000000051101161120036800001002004020040200402004020040
8020420039150041258010010080000100800005006400001200200200392003999730399978010020080000200160000200392003911802011009910010080000100000000051101161120036800001002004020040200402004020040
80204200391500421258010010080000100800005006400001200203200392003999730399978010020080000200160000200392003911802011009910010080000100000000051101161120036800001002004020040200402004020040
8020420039150041258010010080000100800005006400001200200200392003999730399978010020080000200160000200392003911802011009910010080000100000000051101161120036800001002004020040200402004020040

1000 unrolls and 10 iterations

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

retire (01)cycle (02)03071f3f51inst 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)9faccfd0d2icache miss (d3)d5d6d9daddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
800242004815000174258001010800001080000506400000200202003920039999631001980010208000020160000200392003911800211091010800001005020000216001120036080000102004020040200402004020040
80024200391500040258001012800001080000506400000200202003920039999631001980010208000020160000200392003911800211091010800001005020000116001120036080000102004020040200402004020040
800242003915000210258001010800001080000506400000200202003920039999631001980010208000020160000200392003911800211091010800001005020000116001120036080000102004020040200402004020040
80024200391500040258001010800001080000506400000200202003920039999631001980010208000020160000200392003911800211091010800001005020000116001120036080000102004020197200402004020040
8002420039150088126258001010800001080000506400000200202003920039999631001980010208000020160000200392003911800211091010800001005020000116001120036080000102004020040200402004020040
80024200391500040258001010800001080000506400000200202003920039999631001980010208000020160000200392003911800211091010800001005020000116003120036080000102004020040200402004020040
80024200391500040258001010800001080000506400000200202003920039999631001980010208000020160000200392003911800211091010800001005020000116001120036080000102004020040200402004020040
80024200391500040258001010800001080000506400000200202003920039999631001980010208000020160000200392003911800211091010800001005020000116001120036080000102004020040200402004020040
80024200391501040258001010800001080000506400000200202003920039999631001980012208000020160000200392003911800211091010800001005020000116001120036080000102004020040200402004020040
80024200391500082258001010800001080000506400000200202003920039999631001980010208000020160000200392003911800211091010800001005020000116003220036080000102004020040200402004020040