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, 8H)

Test 1: uops

Code:

  sabdl2 v0.8h, v0.16b, v1.16b
  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
100430372206125482510001000100039831313018303730372415328951000100020003037303711100110000073216112630100030383038303830383038
100430372306125482510001000100039831313018303730372415328951000100020003037303711100110000073116112630100030383038303830383038
100430372206125482510001000100039831313018303730372415328951000100020003037303711100110000073116112630100030383038303830383038
100430372306125482510001000100039831313018303730372415328951000100020003037303711100110000073116112630100030383038303830383038
100430372306125482510001000100039831313018303730372415328951000100020003037303711100110000073116112630100030383038303830383038
100430372206125482510001000100039831313018303730372415328951000100020003037303711100110000073116112630100030383038303830383038
100430372306125482510001000100039831313018303730372415328951000100020003037303711100110000073116112630100030383038303830383038
100430372306125482510001000100039831313018303730372415328951000100020003037303711100110000073116112630100030383038303830383038
100430372266125482510001000100039831313018303730372415328951000100020003037303711100110000073116112630100030383038303830383038
100430372206125482510001000100039831313018303730372415328951000100020003037303711100110000073116112630100030383038303830383038

Test 2: Latency 1->2

Code:

  sabdl2 v0.8h, v0.16b, v1.16b
  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)03081e3a3f4e51inst 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)9fa6a8a9acc5cfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
102043003722500061295482510100100100001001000050042773130300180300373003728265328745101002001000020020000300373003711102011009910010010000100000007101161129634100001003003830038300383003830038
102043003722500061295482510100100100001001000050042773130300180300373003728265328745101002001000020020000300373003711102011009910010010000100000289807101161129634100001003003830038300383003830038
102043003722500061295482510100100100001001000050042773130300180300373003728265328745101002001000020020000300373003711102011009910010010000100000007101161129634100001003003830038300383003830038
102043003722500061295482510100100100001001000050042773130300180300373003728265328745101002001000020020000300373003711102011009910010010000100000007101161129634100001003003830038300383003830038
102043003722509061295482510100100100001001000050042773131300180300373003728265328745101002001000020020000300373003711102011009910010010000100000007101161129634100001003003830038300383003830038
102043003722500061295482510100100100001001000050042773131300180300373003728265328745101002001000020020000300373003711102011009910010010000100000007101161129634100001003003830038300383003830038
102043003722500061295482510100100100001001000050042773131300180300373003728265328745101002001000020020000300373003711102011009910010010000100000007101161129634100001003003830038300383003830038
102043003722500061295482510100100100001001000050042773130300180300373003728265328745101002001000020020000300373003711102011009910010010000100000007101161129634100001003003830038300383003830038
102053003722500061295482510100100100001001000050042773131300180300373003728265328745101002001000020020000300373003711102011009910010010000100020607101161129634100001003003830038301233008430038
1020430037225012061295482510100104100001001000050042786351300180300373003728265328745102722001000020020000300373003721102011009910010010000100010007101161129634100001003003830038300383003830038

1000 unrolls and 10 iterations

Result (median cycles for code): 3.0037

retire (01)cycle (02)03080b18191e3f4e51inst 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)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
1002430037225000006129548251001010100001010000504277313130018300373003728287328767100102010000202000030037300371110021109101010000100006404162229630010000103003830038300383003830038
1002430037225000006129548251001010100001010000504277313030018300373003728287328767100102010000202000030037300371110021109101010000100006402162229630010000103003830038300383003830038
1002430037225000006129548251001010100001010000504277313030018300373003728287328767100102010000202000030037300371110021109101010000100028916402162229630010000103003830038300383003830038
1002430037225000006129548251001010100001010000504277313030018300373003728287328767100102010000202000030037300371110021109101010000100006402162229630010000103003830038300383003830038
1002430037225000006129548251001010100001010000504277313030018300373003728287328767100102010000202000030037300371110021109101010000100006402162229630010000103003830038300383003830038
1002430037225000006129548251001010100001010000504277313130018300373003728287328767100102010000202000030037300371110021109101010000100006402162229630010000103003830038300383003830038
1002430037224000006129548251001010100001010000504277313030018300373003728287328767100102010000202000030037300371110021109101010000100006402162229630010000103003830038300383003830038
1002430037225000006129548251001010100001010000504277313030018300373003728287328767100102010000202000030037300371110021109101010000100006402162229630010000103003830038300383008530038
1002430037224000006129548251001010100001010000504277313030018300373003728287328767100102010000202000030037300371110021109101010000100006402162229630010000103003830038300383003830038
100243003722500000117029548251001010100001010000504277313030018300373003728287328767100102010000202000030037300371110021109101010000100006402162229630010000103003830038300383003830038

Test 3: Latency 1->3

Code:

  sabdl2 v0.8h, v1.16b, v0.16b
  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)03083f4e51inst 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)9fa8c5cfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
1020430037225061295482510100100100001001000050042773130300183003730037282650328745101002001000020020000300373003711102011009910010010000100007101161129634100001003003830038300383003830038
1020430037225061295482510100100100001001000050042773131300183003730037282650328745101002001000020020000300373003711102011009910010010000100007101161129634100001003003830038300383003830038
10204300372240103295482510100100100001001000050042773130300183003730037282650328745101002001000020020000300373003711102011009910010010000100007101161129634100001003003830038300383003830038
1020430037225061295482510100100100001001000050042773130300183003730037282650328745101002001000020020000300373003711102011009910010010000100007101161129634100001003003830038300383003830038
1020430037225061295482510100100100001001000050042773130300183003730037282650328745101002001000020020000300373008511102011009910010010000100007101161129634100001003003830038300383003830038
1020430037225061295482510100100100001001000050042773130300183003730037282650328745101002001000020020000300373003711102011009910010010000100007101161129634100001003003830038300383003830038
1020430037225061295482510100100100001001000050042773130300183003730037282650328745101002001000020020000300373003711102011009910010010000100007101161129634100001003003830038300383003830038
1020430037225061295482510100100100001001000050042773130300183003730037282650328745101002001000020020000300373003711102011009910010010000100007101161129634100001003003830038300383003830038
1020430037224061295482510100100100001001000050042773130300183003730037282650328745101002001000020020000300373003711102011009910010010000100007101161129634100001003003830038300383003830038
1020430037225061295482510100100100001001000050042773130300183003730037282650328745101002001000020020000300373003711102011009910010010000100007101161129634100001003003830038300383003830038

1000 unrolls and 10 iterations

Result (median cycles for code): 3.0037

retire (01)cycle (02)033f4e51inst 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)9fa8accfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
10024300372256129548251001010100001010000504277313300183003730037282873287671001020100002020000300373003711100211091010100001000640216222963010000103003830038300383003830038
100243003722561295482510010101000010100005042773133001830037300372828732876710010201000020200003003730037111002110910101000010100640216222963010000103003830038300383003830038
10024300372256129548251001010100001010000504277313300183003730037282873287671001020100002020000300373003711100211091010100001000640216222963010000103003830038300383003830038
10024300372256129548251001010100001010000504277313300183003730037282873287671001020100002020000300373003711100211091010100001000640216222963010000103003830038300383003830038
10024300372246129548251001010100001010000504277313300183003730037282873287671001020100002020000300373003711100211091010100001000640216222963010000103003830038300383008530038
10024300372256129548251001010100001010000504277313300183003730037282873287671001020100002020000300373003711100211091010100001003640216222963010000103003830038300383003830038
10024300372256129548251001010100001010000504277313300183003730037282873287671001020100002020000300373003711100211091010100001000640216222963010000103003830038300383003830038
10024300372246129548251001010100001010000504277313300183003730037282873287671001020100002020000300373003711100211091010100001000640216222963010000103003830038300383003830038
10024300372256129530251001010100001010000504277313300183003730037282873287671001020100002020000300373003711100211091010100001000640216222963010000103003830038300383003830038
10024300372246129530251001010100001010000504277313300183003730037282873287671001020100002020000300373003711100211091010100001000640216222963010000103003830038300383003830038

Test 4: throughput

Count: 8

Code:

  sabdl2 v0.8h, v8.16b, v9.16b
  sabdl2 v1.8h, v8.16b, v9.16b
  sabdl2 v2.8h, v8.16b, v9.16b
  sabdl2 v3.8h, v8.16b, v9.16b
  sabdl2 v4.8h, v8.16b, v9.16b
  sabdl2 v5.8h, v8.16b, v9.16b
  sabdl2 v6.8h, v8.16b, v9.16b
  sabdl2 v7.8h, v8.16b, v9.16b
  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)030b181e3f51inst 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)9fa8accfd5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
8020420060150000852580100100800001008000050064000020020200392003999733999780100200800002001600002003920039118020110099100100800001000051102161120036800001002004020040200402004020040
80204200391500012412580100100800001008000050064000020020200392003999733999780100200800002001600002014220039118020110099100100800001000051101161120036800001002004020040200402004020040
8020420039150000832580100100800001008000050064000020020200392003999733999780100200800002001600002008920039118020110099100100800001000051102161120036800001002004020091200402004020040
8020420039150000412580100100800001008000050064000020020200392003999733999780100200800002001600002003920039118020110099100100800001001051101161120036800001002004020040200402004020040
802042003915000181882580100100800001008000050064000020020200392003999733999780100200800002001600002003920039118020110099100100800001000051101161120036800001002004020040200402004020040
8020420039150000412580100100800001008000050064000020020200392003999733999780100200800002001600002003920039118020110099100100800001000051101161120036800001002004020040200402004020040
8020420039150000412580100100800001008000050064000020020200392003999733999780100200800002001600002003920039118020110099100100800001000051101161120036800001002004020040200402004020040
8020420039150000832580100100800001008000050064000020020200392003999733999780100200800002001600002003920039118020110099100100800001001051101161120036800001002004020040200402004020040
8020420039150000622580100100800001008000050064000020020200392003999733999780100200800002001600002003920039118020110099100100800001000051101161120036800001002004020040200402004020045
8020420039150100622580100100800001008000050064000020020200392003999733999780100200801072001600002003920039218020110099100100800001000651101161120036800001002004020040200402004020040

1000 unrolls and 10 iterations

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

retire (01)cycle (02)0304091e3a3f51inst 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)9fa8cfd0d2icache miss (d3)itlb miss (d4)d5d6d9dbddinst fetch restart (de)e0eaeb? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
800242003915000004025800101080000108000050640000102002020039200399996310019800102080000201600002003920039118002110910108000010050210001181600817200360080000102004020040200402004020040
8002420039150110086258001010800001080000506400001020020200392003999963100198001020800002016000020039200391180021109101080000100502100011216001714200360080000102004020040200402004020040
8002420039150110086258001010800001080000506400000020020200392003999963100198001020800002016000020039200391180021109101080000100502100011416001710200360080000102004020040200402004020040
800242003915011008225800101080000108000050640000102002020039200399996310019800102080000201600002003920039118002110910108000010050210001171600917200360080000102004020040200402004020040
8002420039150000014925800101080000108000050640000102002020039200399996310019800102080000201600002003920039118002110910108000010050210001101600178200360080000102004020040200402004020040
8002420039150110086258001010800001080000506400001020020200392003999963100198001020800002016000020039200391180021109101080000101502100011716001017200360080000102004020040200402004020040
80024200391501100128258001010800001080000506400001020020200392003999963100198001020800002016000020039200391180021109101080000100502100011816001715200360080000102004020040200402004020040
8002420039150110012825800101080000108000050640000102002020039200399996310019800102080000201600002003920039118002110910108000010050210001816001417200360080000102004020040200402004020040
8002420039150110086258001010800001080000506400001020020200392003999963100198001020800002016000020039200391180021109101080000100502100011816001717200360080000102004020040200402004020040
8002420039150110086258001010800001080000506400001020020200392003999963100198001020800002016000020039200391180021109101080000100502100011716001717200360080000102004020040200402004020040