Apple M1 Microarchitecture Research by Dougall Johnson

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

SABDL2 (vector, 4S)

Test 1: uops

Code:

  sabdl2 v0.4s, v0.8h, v1.8h
  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)031e1f3f4e51inst 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)a8cfd5d6ddinst fetch restart (de)e0? fp/simd (ee)f5f6f7f8fd
10043037220061254825100010001000398313301830373037241532895100010002000303730371110011000073116112630100030383038303830383038
10043037230061254825100010001000398313301830373037241532895100010002000303730371110011000073116112630100030383038303830383038
10043037220061254825100010001000398313301830373037241532895100010002000303730371110011000073116112630100030383038303830383038
10043037220061254825100010001000398313301830373037241532895100010002000303730371110011000073116112630100030383038303830383038
10043037220061254825100010001000398313301830373037241532895100010002000303730371110011000073116112630100030383038303830383038
10043037230061254825100010001000398313301830373037241532895100010002000303730371110011000073116112630100030383038303830383038
10043037230061254825100010001000398313301830373037241532895100010002000303730371110011000073116112630100030383038303830383038
10043037220061254825100010001000398313301830373037241532895100010002000303730371110011000073116112630100030383038303830383038
10043037230061254825100010001000398313301830373037241532895100010002000303730371110011000073116112630100030383038303830383038
10043037220061254825100010001000398313301830373037241532895100010002000303730371110011000073116112630100030383038303830383038

Test 2: Latency 1->2

Code:

  sabdl2 v0.4s, v0.8h, v1.8h
  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)031e1f3f4e51inst 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)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)9fa0a1a8acc2cfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
102043003722500612954825101001001000010010000500427731313001830037300372826503287451010020010000200200003003730037111020110099100100100001000000071011611296340100001003003830038300383003830038
102043003722500612954825101001001000010010000500427731313001830037300372826503287451010020010000200200003003730037111020110099100100100001000000071011611296340100001003003830038300383003830038
102043003722500612954825101001001000010010000500427731313001830037300372826503287451010020010000200200003003730037111020110099100100100001000000071011611296340100001003003830038300383003830038
102043003722500612954825101001001000010010000500427731313001830037300372826503287451010020010000200200003003730037111020110099100100100001000000071011611296340100001003003830038300383003830038
102043003722500612954825101001001000010010000500427731303001830037300372826503287451010020010000200200003003730037111020110099100100100001000000071011611296340100001003003830038300383003830038
102043003722500612954825101001001000010010000500427731303001830037300372826503287451010020010000200200003003730037111020110099100100100001000000071011611296340100001003003830038300383003830038
102043003722500612954825101001001000010010000500427731313001830037300372826503287451010020010000200200003003730037111020110099100100100001000000071011611296340100001003003830038300383003830038
102043003722500612954825101001001000010010000500427731313001830037300372826503287451010020010000200200003003730037111020110099100100100001000000071011611296340100001003003830038300383003830038
102043003722500612954825101001001000010010000500427731313001830037300372826503287451010020010000200200003003730037111020110099100100100001000000071011611296340100001003003830038300383003830038
102043003722500612954825101001001000010010000500427731303001830037300372826503287451010020010000200200003003730037111020110099100100100001000000071011611296340100001003003830038300383003830038

1000 unrolls and 10 iterations

Result (median cycles for code): 3.0037

retire (01)cycle (02)03181e1f3f4e51inst 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)9fa8a9acbranch mispredict (cb)cfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
1002430037225000612954825100101010000101000050427731330018300373003728287328767100102010000202000030037300371110021109101010000100000640216222963010000103003830038300383003830038
1002430037225000612953025100101010000101000050427731330018300373003728287328767100102010000202000030037300371110021109101010000100000640216222963010000103003830038300383003830038
1002430037225000612954825100101010000101000050427731330018300373003728287328767100102010000202000030037300811110021109101010000103000640216222963010000103003830038300383003830038
1002430037225000612954825100101010000101000050427731330018300373003728287328767100102010000202000030037300371110021109101010000100000640216222963010000103003830038300383003830038
1002430037225000612954825100101010000101000050427731330018300373003728287328767100102010000202000030037300371110021109101010000100000640216222963010000103003830038300383003830038
1002430037225000612954825100101010000101000050427731330018300373003728287328767100102010000202000030037300371110021109101010000100000640216222963010000103003830038300383003830038
1002430037225000612954825100101010000101000050427731330018300373003728287328767100102010000202000030037300371110021109101010000101000640216422963010000103003830038300383003830038
1002430037225000612954825100101010000101000050427731330018300373003728287328767100102010000202000030037300371110021109101010000100000640216222963010000103003830038300383003830038
1002430037225000612954825100101010000101000050427731330018300373003728287328767100102010000202000030037300371110021109101010000100000640216222963010000103003830038300383003830038
1002430037225000612954825100101010000101000050427731330018300373003728287328767100102010000202000030037300371110021109101010000100000640216222963010000103003830038300383003830038

Test 3: Latency 1->3

Code:

  sabdl2 v0.4s, v1.8h, v0.8h
  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)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)9fa0a8accfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
1020430037225020027922953925101001001000010010149500427731313001830037300372826532874510100200100002002000030037300371110201100991001001000010020071011611296340100001003003830038300383003830038
1020430037225011208229548251010010010000100100005004277313130018300373003728265328745101002001000020020000300373003711102011009910010010000100019710116112963414100001003003830038300383003830038
102043003722500088612954825101001001000010010000500427731313001830037300372826532874510100200100002002000030037300371110201100991001001000010000071011611296340100001003003830038300383003830038
10204300372250000612954825101001001000010010000500427731313001830037300372826532874510100200100002002000030037300371110201100991001001000010000071011611296340100001003003830038300383003830038
10204300372240000612954825101001001000010010000500427731313001830037300372826532874510100200100002002000030037300371110201100991001001000010000071012511296340100001003003830038300383003830038
1020430037225008705362954825101001001000010010000500427731313001830037300372826532874510100200100002002000030037300371110201100991001001000010000071011611296340100001003003830038300383003830038
10204300372240000612954825101001001000010010000500427731313001830037300372826532874510100200100002002000030037300371110201100991001001000010000071011611296340100001003003830038300383003830038
10204300372250000612954825101001001000010010000500427731313001830037300372826532874510100200100002002000030037300371110201100991001001000010000071011611296340100001003003830038300383003830038
10204300372250000612954825101001001000010010000500427731313001830084300372826532874510100200100002002000030037300371110201100991001001000010000071011611296340100001003003830038300383003830038
10204300372250000612954825101001001000010010000500427731313001830037300372826532874510100200100002002000030037300371110201100991001001000010000071011611296340100001003003830038300383003830038

1000 unrolls and 10 iterations

Result (median cycles for code): 3.0037

retire (01)cycle (02)0318191e1f3f4e51inst 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)696b6d6edispatch 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
10024300372250054061295482510010101000010100005042773133001803003730037282873287671001020100002020000300373003711100211091010100001000640216222963010000103003830038300383003830038
100243003722400237061295482510010101000010100005042773133001803003730037282873287671001020100002020000300373003711100211091010100001000640216222963010000103003830038300383003830038
10024300372250024061295482510010101000010100005042773133001803003730037282873287671001020100002020000300373003711100211091010100001000640216222963010000103003830038300383003830038
1002430037225001260222295482510010101000010100005042773133001803003730037282873287671001020100002020000300373003711100211091010100001000640216222963010000103003830038300383003830038
10024300372250018061295482510010101000010100005042773133001803003730037282873287671001020100002020000300373003711100211091010100001000640216222963010000103003830038300383003830038
1002430037225026082295482510010101000010100005042773133001803003730037282873287671001020100002020000300373003711100211091010100001000640216222963010000103003830038300383003830038
10024300372250018061295482510010101000010100005042773133001803003730037282873287671001020100002020000300373003711100211091010100001000640216222963010000103003830038300383003830038
10024300372240039061295482510010101000010100005042773133001803003730037282873287671001020100002020324300373003711100211091010100001000640216222963010000103003830038300383003830038
100243003722500435061295482510010101000010100005042773133001803003730037282873287671001020100002020000300373003711100211091010100001000640216222963010000103003830038300383003830038
10024300372250000251295482510010101000010100005042773133001803003730037282873287671001020100002020000300373003711100211091010100001000640216222963010000103003830038300383003830038

Test 4: throughput

Count: 8

Code:

  sabdl2 v0.4s, v8.8h, v9.8h
  sabdl2 v1.4s, v8.8h, v9.8h
  sabdl2 v2.4s, v8.8h, v9.8h
  sabdl2 v3.4s, v8.8h, v9.8h
  sabdl2 v4.4s, v8.8h, v9.8h
  sabdl2 v5.4s, v8.8h, v9.8h
  sabdl2 v6.4s, v8.8h, v9.8h
  sabdl2 v7.4s, v8.8h, v9.8h
  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)030418191e1f3f51inst 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
802042003915010025504125801001008000010080000500640000120020200392003999733999780100200800002001600002003920039118020110099100100800001000000000511021611200360800001002004020040200402004020040
80204200391500003904125801001008000010080000500640000020020200392003999733999780100200800002001600002003920039118020110099100100800001000000000511011611200360800001002004020040200402004020040
8020420039150000004125801001008000010080000500640000020020200392003999733999780100200800002001600002003920039118020110099100100800001000000000511011611200360800001002004020040200402004020040
8020420039150000004125801001008000010080000500640000020020200392003999733999780100200800002001600002003920039118020110099100100800001000000000511011611200360800001002004020040200402004020040
8020420039150000004125801001008000010080000500640000020020200392003999733999780100200800002001600002003920039118020110099100100800001000000000511011611200360800001002004020040200402004020040
802042003915000024041258010010080000100800005006400000200202003920039997339997801002008000020016000020039200391180201100991001008000010000000540511011611200360800001002004020040200402004020040
8020420039150000004125801001008000010080000500640000020020200392003999733999780100200800002001600002003920039118020110099100100800001000000000511011611200360800001002004020040200402004020040
802042003915000042604125801001008000010080000500640000020069200392003999733999780100200800002001600002003920039118020110099100100800001000000000511011611200360800001002004020040200402004020040
8020420039150000537070625801001008000010080000500640000020020200392003999733999780100200801042001600002003920039118020110099100100800001000000000511011611200360800001002004020040200402004020040
8020420039150000004125801001008000010080000500640000020020200392003999733999780100200800002001600002003920039118020110099100100800001000000000511011611200360800001002004020040200402004020040

1000 unrolls and 10 iterations

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

retire (01)cycle (02)03070a1e1f3a3f51inst 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)5f60696b6d6edispatch 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)9fa1a8accfd0d2icache miss (d3)d5d6d9dadbddinst fetch restart (de)e0eaeb? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
80024200401500000040258001010800001080000506400000020020020039200399996310019800102080000201600002003920039118002110910108000010000502000015160001714200360080000102004020040200402004020040
80024200391500000040258001010800001080000506400000020020020039200399996310019800102080000201600002003920039118002110910108000010000502000016160001617200360080000102004020040200402004020040
8002420039150002100402580010108000010800005064000001200200200392003999962710019800102080000201600002003920039118002110910108000010000502000016160001618200360080000102004020040200402004020040
80024200391500000040258001010800001080000506400000120020020039200399996310019800102080000201600002003920039118002110910108000010000502000017160001417200360080000102004020040200402004020040
8002420039150000352040258001010800001080000506400000120020020039200399996310019800102080000201600002003920039118002110910108000010000502000017160001415200360080000102004020040200402004020040
80024200391500015004025800101080000108000050640000012002002003920039999631001980010208000020160000200392003911800211091010800001000050200001716000917200360080000102004020040200402004020040
80024200391500000040258001010800001080000506400000120020020039200399996310019800102080000201600002003920039118002110910108000010000502000017160001417200360080000102004020040200402004020088
80024200391500000040258001010800001080000506400000120020020039200399996310019800102080000201600002003920039118002110910108000010000502000017160001716200360080000102004020040200402004020040
80024200391500000040258001010800001080000506400000120020320039200399996310019800102080000201600002003920039118002110910108000010000502000014160001716200360080000102004020040200402004020040
800242003915000120040258001010800001080000506400000120020020039200399996310019800102080000201600002003920039118002110910108000010000502000017160001717200360080000102004020040200402004020040