Apple M1 Microarchitecture Research by Dougall Johnson

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

SABDL (vector, 4S)

Test 1: uops

Code:

  sabdl v0.4s, v0.4h, v1.4h
  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)a8cfd5d6ddinst fetch restart (de)e0? fp/simd (ee)f5f6f7f8fd
10043037230612548251000100010003983131301830373037241532895100010002000303730371110011000073116112630100030383038303830383038
10043037230612548251000100010003983131301830373037241532895100010002000303730371110011000073116112630100030383038303830383038
10043037239612548251000100010003983131301830373037241532895100010002000303730371110011000073116112630100030383038303830383038
10043037230612548251000100010003983131301830373037241532895100010002000303730371110011000073116112630100030383038303830383038
100430372301032548251000100010003983131301830373037241532895100010002000303730371110011000073116112630100030383038303830383038
10043037230612548251000100010003983131301830373037241532895100010002000303730371110011000073116112630100030383038303830383038
10043037220612548251000100010003983131301830373037241532895100010002000303730371110011000073116112630100030383038303830383038
10043037230612548251000100010003983131301830373037241532895100010002000303730371110011000073116112630100030383038303830383038
10043037230612548251000100010003983131301830373037241532895100010002000303730371110011000073116112630100030383038303830383038
10043037230612548251000100010003983131301830373037241532895100010002000303730371110011000073116112630100030383038303830383038

Test 2: Latency 1->2

Code:

  sabdl v0.4s, v0.4h, v1.4h
  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)030818191e1f3f4e51inst 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)9fa0a1a7a8a9acc2c5branch mispredict (cb)cdcfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
10204300372240000081295482510100100100001001000050042773130300183003730037282650328745101002001000020020000300373003711102011009910010010000100000000000071011611296340100001003003830038300383003830038
102043003722500000726295482510100100100001001000050042773130300183003730037282650328745101002001000020020000300373003711102011009910010010000100000000000071011611296340100001003003830038300383003830038
102043003722500000726295482510100100100001001000050042773131300183003730037282650328745101002001000020020000300373003711102011009910010010000100000000000071011611296340100001003003830038300383003830038
102043003722500000251295482510100100100001001000050042773131300183003730037282650328745101002001049420020000300373003711102011009910010010000100000000000071011611296340100001003003830038300383003830038
102043003722500000726295482510100100100001001000050042773130300183003730037282650328745101002001000020020000300373003711102011009910010010000100000000000071011611296340100001003003830038300383003830038
10204300372250000061295482510100100100001001000050042773131300183003730037282650328745101002041016420620330300853008421102011009910010010000100220002825200073213311296700100001003003830038300383003830038
102043003722500089706129548451010010010000103102985814280027130018300373003728265032874510100200100002002000030037300371110201100991001001000010092100141180000825464112977521100001003032330085303123027630274
102043032522513452826461295482510100100100001001000050042773130300183003730037282650328745101002001000020020000300373003711102011009910010010000100000000000071011611296340100001003003830038300383003830038
10204300372250000061295482510100100100001001000050042773130300183003730037282650328745101002101000020020000300373003711102011009910010010000100000000000071011612296340100001003003830038300383003830038
102043003722500000229295482510100100100001001000050042777971300183003730037282650328745101002001000020020000300373003711102011009910010010000100000000000071011611296340100001003003830038300383003830038

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)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)9faccfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
10024300372250612954825100101010000101000050427731313001803003730037282870328767100102010000202000030037300371110021109101010000100640216222963010000103003830038300383003830038
10024300372250612954825100101010000101000050427731303001803003730037282870328767100102010000202000030037300371110021109101010000100640216222963010000103003830038300383003830038
10024300372250612954825100101010000101000050427731303001803003730037282870328767100102010000202000030037300371110021109101010000100640216222963010000103003830038300383003830038
10024300372240612954825100101010000101000050427731303001803003730037282870328767100102010000202000030037300371110021109101010000100640216222963010000103003830038300383003830038
10024300372250612954825100101010000101000050427731303001803003730037282870328767100102410000202067030037300371110021109101010000100640216222963010000103003830038300383003830038
1002430037225061295482510010101000010100005042773131300180300373003728287032876710010201000020200003003730037111002110910101000010159640216222963010000103003830038300383003830038
10024300372250612954825100101010000101000050427731313001803003730037282870328767100102010000202000030037300371110021109101010000100640216222963010000103003830038300383003830038
10024300372250612954825100101010000101000050427731303001803003730037282870328767100102010000202000030037300371110021109101010000100640216222963010000103003830038300383003830038
10024300372250612954825100101010000101000050427731313001803003730037282870328767100102010000202000030037300371110021109101010000100640216222963010000103003830038300383003830038
10024300372250612954825100101010000101000050427731313001803003730037282870328767100102010000202000030037300371110021109101010000100640216222963010000103003830038300383003830038

Test 3: Latency 1->3

Code:

  sabdl v0.4s, v1.4h, v0.4h
  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)0318193f4e51inst 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
10204300372250061295482510100100100001001000050042773131300183003730037282653287451010020010000200200003003730037111020110099100100100001000071011611296340100001003003830038300383003830038
10204300372250061295482510100100100001001000050042773131300183003730037282653287451010020010000200200003003730037111020110099100100100001000071011611296340100001003003830038300383003830038
10204300372250061295482510100100100001001000050042773131300183003730037282653287451010020010000200200003003730037111020110099100100100001000071011611296340100001003003830038300383003830038
10204300372250061295482510100100100001001000050042773131300183003730037282653287451010020010000200200003003730037111020110099100100100001000071011611296340100001003003830038300383003830038
10204300372250061295482510100100100001001000050042773131300183003730037282653287451010020010000200200003003730037111020110099100100100001000071011611296340100001003013230038300383008530038
10204300372258861295482510100100100001001000050042773131300183003730037282653287451010020010000200200003003730037111020110099100100100001004071011611296340100001003003830038300383003830038
10204300372250061295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000071011611296340100001003003830038300383003830038
10204300372250061295482510100100100001001000050042773131300183003730037282653287451010020010000200200003003730037111020110099100100100001000071011611296340100001003003830038300383003830038
10204300372250061295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000071011611296340100001003003830038300383003830038
10204300372250061295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000071011611296340100001003003830038300383003830038

1000 unrolls and 10 iterations

Result (median cycles for code): 3.0037

retire (01)cycle (02)03071e1f3a3f4e51inst 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)9fa8a9acc5cfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
1002430037225000061295482510010101000010100005042773131300183003730037282870328767100102010000202000030037300371110021109101010000100000640216222963010000103003830038300383003830038
1002430037225000061295482510010101000010100005042773131300183003730037282870328767100102010000202000030037300371110021109101010000100000640216222963010000103003830038300383003830038
1002430037225000061295482510010101000010100005042773131300183003730037282870328767100102010000202000030037300371110021109101010000100000640216222963010000103003830038300383003830038
1002430037224000061295482510010101000010100005042773131300183003730037282870328767100102010000202000030037300371110021109101010000100000640216222963010000103003830038300383003830038
1002430037225000061295482510010101000010100005042773131300183003730037282870328767100102010000202000030037300371110021109101010000100000640216222963010000103003830038300383003830038
1002430037225000061295482510010101000010100005042773131300183003730037282870328767100102010000202000030037300371110021109101010000100000640216222963010000103003830038300383003830038
1002430037225000061295482510010101000010100005042773131300183003730037282870328767100102010000202000030037300371110021109101010000100000640216222963010000103003830038300383003830038
1002430037227000061295482510010101000010100005042773131300183003730037282870328767100102010000202000030037300371110021109101010000100000640116222963010000103003830038300383003830038
1002430037225000061295482510010101000010100005042773131300183003730037282870328767100102010000202000030037300371110021109101010000100000640216222963010000103003830038300383003830038
1002430037224000061295482510010101000010100005042773131300183003730037282870328767100102010000202000030037300371110021109101010000100000640216222963010000103003830038300383003830038

Test 4: throughput

Count: 8

Code:

  sabdl v0.4s, v8.4h, v9.4h
  sabdl v1.4s, v8.4h, v9.4h
  sabdl v2.4s, v8.4h, v9.4h
  sabdl v3.4s, v8.4h, v9.4h
  sabdl v4.4s, v8.4h, v9.4h
  sabdl v5.4s, v8.4h, v9.4h
  sabdl v6.4s, v8.4h, v9.4h
  sabdl v7.4s, v8.4h, v9.4h
  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)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)9fcfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
8020420058150041258010010080000100800005006400001200202003920039997339997801002008000020016000020039200391180201100991001008000010051102161120036800001002004020040200402004020040
8020420039150041258010010080000100800005006400001200202003920039997339997801002008000020016000020039200392180201100991001008000010051101161120036800001002004020040200402004020040
8020420039150041258010010080000100800005006400001200202003920039997339997801002008000020016000020039200391180201100991001008000010051101161120036800001002004020040200402004020040
802042003915010241258010010080000100800005006400000200202003920039997339997801002008000020016000020039200391180201100991001008000010051101161120036800001002004020040200402004020040
8020420039150041258010010080000100800005006400001200202003920039997339997801002008000020016000020039200391180201100991001008000010051101161120036800001002004020040200402004020040
8020420039150041258010010080000100800005006400001200202003920039997339997801002008000020016000020039200391180201100991001008000010051101161120036800001002004020040200402004020040
80204200391503941258010010080000100800005006400000200202003920039997339997801002008000020016000020039200391180201100991001008000010051101161120036800001002004020040200402004020040
8020420039150041258010010080000100800005006400001200592003920039997339997801002008000020016000020039200391180201100991001008000010051101161120036800001002004020040200402004020107
8020420039150041258010010080000100800005006400001200202003920039997339997801002008000020016000020039200391180201100991001008000010051101161120036800001002004020040200402004020040
802042003915033341258010010080000100800005006400000200202003920039997339997801002008000020016000020039200391180201100991001008000010051101161120036800001002004020040200402004020040

1000 unrolls and 10 iterations

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

retire (01)cycle (02)03070b1e3f51inst 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)5f6061696d6edispatch 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)e0eb? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
800242004815500040258001010800001080000606400000002002020039200399996310019800102080000201600002003920039118002110910108000010050202162220036080000102004020040200402004020040
800242003915000040258001010800001080000506400000002002020039200399996310019800102080000201600002003920039118002110910108000010050202162220036080000102004020040200402004020040
800242003915000040258001010800001080000506400000002002020039200399996310019800102080000201600002003920039118002110910108000010650202162220036080000102004020040200402004020040
800242003915000640258001010800001080000506400000002002020039200399996310019800102080000201600002003920039118002110910108000010050203163220036080000102004020040201122004020040
8002420039150000402580010108000010800005064000000020020200392003999963100198001020800002016000020039200391180021109101080000100502031634200362280000102004020040200402004020040
8002420039150006230258001010800001080000506400000012002020039200399996310019800102080000201600002003920039118002110910108000010050203164220036080000102004020040200402004020040
800242003915000040258001010800001080000506400000002002020039200399996310019800102080000201600002003920039118002110910108000010050202162220036080000102004020040200402004020040
800242003915000040258001010800001080000506400000002002020039200399996310019800102080000201600002003920039118002110910108000010050202162220036080000102004020040200402004020040
800242003915000640258001010800001080000506400000002002020039200399996310019800102080000201600002003920039118002110910108000010050202162220036080000102004020040200402004020040
800242003915000040258001010800001080000506400000002002020039200399996310019800102080000201600002003920039118002110910108000010050202163420036080000102004020040200402004020040