Apple M1 Microarchitecture Research by Dougall Johnson

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

SQSUB (vector, 2S)

Test 1: uops

Code:

  sqsub v0.2s, v0.2s, v1.2s
  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
100430372306125482510001000100039831313018303730372415328951000100020003037303711100110000373116112630100030383038303830383038
100430372208425482510001000100039831313018303730372415328951000100020003037303711100110000073116122630100030383038303830383038
100430372306125482510001000100039831313018303730372415328951000100020003037303711100110000073116112630100030383038303830383038
100430372306125482510001000100039831313018303730372415328951000100020003037303711100110000073116112630100030383038303830383038
100430372306125482510001000100039831313018303730372415328951000100020003037303711100110000073116112630100030383038303830383038
100430372206125482510001000100039831313018303730372415328951000100020003037303711100110000073116112630100030383038303830383038
1004303723010325482510001000100039831313018303730372415328951000100020003037303711100110000073116112630100030383038303830383038
100430372206125482510001000100039831303018303730372415328951000100020003037303711100110000073116112630100030383038303830383038
100430372306125482510001000100039831313018303730372415328951000100020003037303711100110000073116112630100030383038303830383038
100430372306125482510001000100039831313018303730372415328951000100020003037303711100110000073116112630100030383038303830383079

Test 2: Latency 1->2

Code:

  sqsub v0.2s, v0.2s, v1.2s
  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)03070b18191e3a3f4e51inst 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)9fa0a8cfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
1020430037225000000726295482510100100100001001000050042773131300183003730037282653287451010020010000200200003003730037111020110099100100100001000171011611296340100001003003830038300383003830038
10204300372250000015362954825101001001000010010000500427731313001830037300372826532874510100200100002002000030037300371110201100991001001000010000710116112963425100001003003830038300383003830038
102053003722500000061295482510100125100001001000050042773131300183003730037282653287451010020010000200200003003730037111020110099100100100001000571011613296340100001003003830038300383003830038
1020430037224010000191295482510100100100001001000050042773131300183003730037282653287441010020010000200200003003730037111020110099100100100001000071011611296340100001003003830038300383003830038
102043003722500000061295482510100100100001001000050042773131300183003730037282653287451010020010000200200003003730037111020110099100100100001000071011616296340100001003003830038300383003830038
102043003722500000061295482510100100100001001000056442773131300183003730037282653287451010020010000200200003003730037111020110099100100100001000071011611296340100001003003830038300383003830038
1020430037225000000612954825101001001000010010000500427731313001830037300372826532874510100200100002002000030037300371110201100991001001000010000710116112963425100001003003830038300383003830038
1020430037225000000382295482510125125100001001000050042773131300183003730037282653287451010020010000200200003003730037111020110099100100100001000071011611296340100001003003830038300383003830038
102043003722500000061295482510100100100001001000050042773131300183003730037282653287451010020010000200200003003730037111020110099100100100001000071011611296340100001003003830038300383003830038
102043003722500000061295482510100100100001001000050042773131300183003730037282653287451010020010000200200003003730037111020110099100100100001000071011611296340100001003003830038300383003830038

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)6061696d6edispatch 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? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
100243003722501452954825100101010000101000050427731310300183003730037282873287671001020100002020000300373003711100211091010100001000640216232963010000103003830038300383003830038
10024300372240612954825100101010000101000050427731310300183003730037282873287671001020100002020000300373003711100211091010100001000640216232963010000103003830038300383003830038
10024300372250612954825100101010000101000050427731313300183003730037282873287671001020100002020000300373003711100211091010100001000640216242963010000103003830038300383003830038
10024300372250612954825100101010000101000050427731300300183003730037282873287671001020100002020000300373003711100211091010100001000640216232963010000103003830038300383003830038
10024300372253612954825100101010000101000050427731300300183003730037282873287671001020100002020000300373003711100211091010100001000640216242963010000103003830038300383003830038
10024300372250612954825100101010000101000050427731300300183003730037282873287671001020100002020000300373003711100211091010100001000640216232963010000103003830038300383003830038
10024300372250612954825100101010000101000050427731300300183003730037282873287671001020100002020000300373003711100211091010100001000640216262963010000103003830038300383003830038
1002430037225192612954825100101010000101000050427731300300183003730037282873287671001020100002020000300373003711100211091010100001000640216232963010000103003830038300383003830038
1002430037225603612954825100101010000101000050427731300300183003730037282873287671001020100002020000300373003711100211091010100001000640216242963010000103003830038300383003830038
10024300372250612954825100101010000101000050427731300300183003730037282873287671001020100002020000300373003711100211091010100001083640216242963010000103003830038300383003830038

Test 3: Latency 1->3

Code:

  sqsub v0.2s, v1.2s, v0.2s
  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)0308090b18191e3f4e51inst 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)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)9faccfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
1020430037225000000612954825101001001000010010000500427731330018300373003728265328745101002001000020020000300373003711102011009910010010000100071011611296340100001003003830038300383003830038
1020430037225000000612954825101001001000010010000500427731330018300373003728265328745101002001000020020000300373003711102011009910010010000100071011611296340100001003003830038300383003830038
1020430037225000000612954825101001001000010010000500427731330018300373003728265328745101002001000020020000300373003711102011009910010010000100071011611296340100001003003830038300383003830038
1020430037225000000612954825101001001000010010000500427731330018300373003728265328745101002001000020020000300373003711102011009910010010000100071011611296340100001003003830038300383003830038
1020430037225000000612954825101001001000010010000500427731330018300373003728265328745101002001000020020000300373003711102011009910010010000100071011611297760100001003003830038300383003830038
10204300372250000007262954825101001001000010010000500427731330018300373003728265328745101002001000020020000300373003711102011009910010010000100071011611296340100001003003830038300383003830038
10204300372240000007262954825101001001000010010000500427731330018300373003728265328745101002001000020020000300373003711102011009910010010000100071011611296340100001003003830038300383003830038
102043003722500000125362954825101001001000010010000500427731330018300373003728265328745101002001000020020000300373003711102011009910010010000100071011611296340100001003003830038300383003830038
10204300372250000001562954825101001001000010010000500427731330018300373003728265328745101002001000020020000300373003711102011009910010010000100071011611296340100001003003830038300383003830038
1020430037225000000612954825101001001000010010000500427731330018300373003728265328745101002001000020020000300373003711102011009910010010000100071011611297750100001003003830038300383003830038

1000 unrolls and 10 iterations

Result (median cycles for code): 3.0037

retire (01)cycle (02)0309181e1f3f4e51inst 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)9fa1a8accfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
10024300372250000612954825100101010000101000050427731303001830037300372828732876710010201000020200003003730037111002110910101000010000640216222963010000103003830038300383003830038
10024300372250000612954825100101010000101000050427731303001830037300372828732876710010201000020200003003730037111002110910101000010000640216222963010000103003830038300383003830038
10024300372250000612954825100101010000101000050427731303001830037300372828732876710010201000020200003003730037111002110910101000010000640216222963010000103003830038300383003830038
10024300372250000612954825100101010000101000050427731303001830037300372828732876710010201000020200003003730037111002110910101000010000640216222963010000103003830038300383003830038
10024300372250000612954825100101010000101000050427731303001830037300372828732876710010201000020200003003730037111002110910101000010000640216222963010000103003830038300383003830038
10024300372250000612954825100101010000101000050427731303001830037300372828732876710010201000020200003003730037111002110910101000010000640216222963010000103003830038300383003830038
10024300372250000612954825100101010000101000050427731313001830037300372828732876710010201000020200003003730037111002110910101000010000640216222963010000103003830038300383003830038
10024300372250000612954825100101010000101000050427731303001830037300372828732876710010201000020200003003730037111002110910101000010000640216222963010000103003830038300383003830038
10024300372250000612954825100101010000101000050427731303001830037300372828732876710010201000020200003003730037111002110910101000010000640216222963010000103003830038300383003830038
10024300372250000612954825100101010000101000050427731303001830037300372828732876710010201000020200003003730037111002110910101000010013640216222963010000103003830038300383003830038

Test 4: throughput

Count: 8

Code:

  sqsub v0.2s, v8.2s, v9.2s
  sqsub v1.2s, v8.2s, v9.2s
  sqsub v2.2s, v8.2s, v9.2s
  sqsub v3.2s, v8.2s, v9.2s
  sqsub v4.2s, v8.2s, v9.2s
  sqsub v5.2s, v8.2s, v9.2s
  sqsub v6.2s, v8.2s, v9.2s
  sqsub v7.2s, v8.2s, v9.2s
  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)030b1e3f51inst 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)9fa0a6a7a8acc5cfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
80204200581500041258010010080000100800005006400001200202003920039997339997801002008000020016000020039200391180201100991001008000010000000051102161120036800001002004020040200402004020040
802042003915000706258010010080000100800005006400001200202003920039997339997801002008000020016000020039200391180201100991001008000010000000051101161120036800001002004020040200402004020040
80204200391500041258010010080099120800005006400001200202003920039997339997801002008000020016000020039200391180201100991001008000010000000051101161120036800001002004020040200402004020040
802042003915000125258010010080000100800005006400001200202003920039997339997801002008000020016000020039200391180201100991001008000010000000051101161120036800001002004020040200402004020040
80204200391500041258010010080000100800005006400001200202003920039997339997801002008000020016000020039200391180201100991001008000010000000051101161120036800001002004020040200402004020040
80204200391500041258010010080000100800005006400001200202003920039997339997801002008000020016000020039200391180201100991001008000010000000051101161120036800001002004020040200402004020040
80204200391500041258010010080000100800005006400001200202003920039997339997801002008000020016000020039200391180201100991001008000010000000051101161120036800001002004020040200402004020040
80204200391500041258010010080000100800005006400001200712003920039997339997801002008000020016000020039200391180201100991001008000010000000051101161120036800001002004020040200402004020040
80204200391500041498010010080000100800005006400001200202003920039997339997801002008000020016000020039200391180201100991001008000010000000051101161120036800001002004020040200402004020040
80204200391500041258010010080000100800005006400001200202003920039997339997801002008000020016000020039200391180201100991001008000010000000051101161120036800001002004020040200402004020040

1000 unrolls and 10 iterations

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

retire (01)cycle (02)03081e3f51inst 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)9fa8cfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
80024200481500040258001010800001080000506400000120020200392003999963100198001020800002016000020039200391180021109101080000100502010167112003680000102004020040200402004020040
80024200391500040258001010800001080000506400000120020200392003999963100198001020800002016000020039200391180021109101080000100502071611112003680000102004020040200402004020040
80024200391500040258001010800001080115506400001120020200392003999963100198001020800002016000020039200391180021109101080000100502011161172003680000102004020040200402004020040
8002420039150004025800101080000108000050640000012002020039200399996310019800102080000201600002003920039118002110910108000010050207161182003680000102004020040200402004020040
80024200391500154025800101080000108000050640000002002020039200399996310019800102080000201600002003920039118002110910108000010150208161172003680000102004020040200402004020040
80024200391521402103258001010800001080000506400000120020200392003999963100198001020800002016000020039200391180021109101080000100502011161172003680000102004020040200402004020040
80024200391500040258001010800001080000506400000020020200392003999963100198001020800002016000020039200391180021109101080000100502011161172003680000102004020040200402004020040
80024200391500040258001010800001080000506400000020020200392003999963100198001020800002016000020039200391180021109101080000100502011161182003680000102004020040200402004020040
80024200391500040258001010800001080000506400000020020200392003999963100198001020800002016000020039200391180021109101080000100502011161172003680000102004020040200402004020040
8002420039150004025800101080000108000050640000002002020039200399996310019800102080000201600002003920039118002110910108000010050207161172003680000102004020040200402004020040