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, 8H)

Test 1: uops

Code:

  sabdl v0.8h, v0.8b, v1.8b
  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)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
100430372215361254825100010001000398313301830373037241532895100010002000303730371110011000073116112630100030383038303830383038
1004303723061254825100010001000398313301830373037241532895100010002000303730371110011000073116112630100030383038303830383038
1004303723061254825100010001000398313301830373037241532895100010002000303730371110011000073116112630100030383038303830383038
1004303723061254825100010001000398313301830373037241532895100010002000303730371110011000073116112630100030383038303830383038
1004303722061254825100010001000398313301830373037241532895100010002000303730371110011000073116112630100030383038303830383038
1004303722061254825100010001000398313301830373037241532895100010002000303730371110011000073116112630100030383038303830383038
1004303723061254825100010001000398313301830373037241532895100010002000303730371110011000073116112630100030383038303830383038
1004303723061254825100010001000398313301830373037241532895100010002000303730371110011000173116112630100030383038303830383038
1004303723082254825100010001000398313301830373037241532895100010002000303730371110011000073116112630100030383038303830383038
1004303722061254844100010001000398313301830373037241532895100010002000303730371110011000073116112630100030383038303830383038

Test 2: Latency 1->2

Code:

  sabdl v0.8h, v0.8b, v1.8b
  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)0308181e3f4e51inst 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)9fa1a6a8accfd0d5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
10204300372250006129548251010010010000100100005004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100000071001161129634100001003003830038300383003830038
102043003722501061295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000224871001161129634100001003003830038300383003830038
102043003722510053629548251010010010000100100005004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100000071001161129634100001003003830038300383003830038
10204300372250006129548251010010010000100100005004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100000071001161129634100001003003830038300383003830038
10204300372250006129548251010010010008100100005004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100004071001161129937100001003003830038300383003830038
10204300372250006129548251010010010000100100005004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100003071001161129634100001003003830038300383003830038
10204300372240006129548251010010010000100100005004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100023071001161129667100001003003830038300383003830038
10204300372250006129548251010010010000100100005004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100002071001161129634100001003003830038300383003830038
102043003722500396129548251010010010000100100005004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100000071001161129634100001003003830038300383003830038
10204300372250006129548251010010010000100100005004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100003071001161129634100001003003830038300383003830038

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)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? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
1002430037225061295482510010101000010100005042773133001830037300372828732876710010201000020200003003730037111002110910101000010006402162229630010000103003830038300383003830038
1002430037224061295482510010101000010100005042773133001830037300372828732876710010201000020200003003730037111002110910101000010006402162229630010000103003830038300383003830038
1002430037225061295482510010101000010100005042773133001830037300372828732876710010201000020200003003730037111002110910101000010006402162229630210000103003830038300383003830038
1002430037225061295482510010101000010100005042786703001830037300372828732876710010201000020200003003730037111002110910101000010006402162229630010000103003830038300383003830038
1002430037224061295482510010101000010100005042773133001830037300372828732876710010201000020200003003730037111002110910101000010006402162229630010000103003830038300383003830038
1002430037224061295482510010101000010100005042773133001830037300372828732878210010201000020200003003730037111002110910101000010006402162229630010000103003830038300383003830038
10024300372250726295482510010101000010100005042773133001830037300372828732876710010201000020200003003730037111002110910101000010006402162229630010000103003830038300383003830038
1002430037225061295482510010101000010100005042773133001830037300372828732876710010201000020200003003730037111002110910101000010106402162229630010000103003830038300383003830038
1002430037225061295482510010101000010100005042773133001830037300372828732876710010201000020200003003730037111002110910101000010006402162229630010000103003830038300383003830038
1002430037224061295482510010101000010100005042773133005230037300372830732876710010201000020200003003730037111002110910101000010006402162229630010000103003830038300383003830038

Test 3: Latency 1->3

Code:

  sabdl v0.8h, v1.8b, v0.8b
  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)030b1e3f4e51inst 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)9fa1a8acc5branch mispredict (cb)cdcfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
102043003722500612954825101001001000010010000500427731303001830037300372827272874110100200100082002001630037300371110201100991001001000010000011171801600296470100001003003830038300383003830038
102043003722400612954825101001001000010010000500427731313001830037300372827262874010100200100082002001630037300371110201100991001001000010000011171701600296460100001003003830038300383003830038
102043003722500612954825101001001000010010000500427731303001830037300372827272874010100200100082002001630037300371110201100991001001000010000011171701600296460100001003003830038300383003830038
1020430037225006129548251010010010000100100005004277313030018300373003728272628740101002001000820020016300373003711102011009910010010000100000111717016002964721100001003003830038300383003830038
102043003722500612954825101001001000010010000500427731303001830037300372827272874010100200100082002001630037300371110201100991001001000010000000071011611296340100001003003830038300383003830038
102043003722500612954825101001001000010010000500427731313001830037300372826532874510100200100002002000030037300371110201100991001001000010000000071011611296340100001003003830038300383003830038
102043003722400612954825101001001000010010000500427731313001830037300372826532874510100200100002002000030037300371110201100991001001000010020000071011611296340100001003003830038300383003830038
102043003722500612954825101001001000010010000500427731303001830037300372826532874510100200100002002000030037300371110201100991001001000010000000071011611296340100001003003830038300383003830038
102043003722500612954825101001001000010010000500427731313001830037300372826532874510100200100002002000030037300371110201100991001001000010000000071011611296340100001003003830038300383003830038
102043003722500612954825101001241000010010000500427731313001830037300372826532874510100200100002002000030037300371110201100991001001000010000000071011611296340100001003003830038300383003830038

1000 unrolls and 10 iterations

Result (median cycles for code): 3.0037

retire (01)cycle (02)03191e3f4e51inst 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)9fa0a8a9accfd0d2d5d6ddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
1002430037225006129548251001010100001010000504277313103001830037300372828732876710010201000020200003003730037111002110910101000010000064000216222963010000103003830038300383003830038
1002430037225006129548251001010100001010000504277313003001830037300372828732876710010201000020200003003730037111002110910101000010000067000216222963010000103003830038300383003830038
100243003722500174829548251001010100001010000504277313003001830037300372828732876710010201000020200003003730037111002110910101000010000064000216222963010000103003830038300383003830038
1002430037225006129548251001010100001010000504277313003001830037300372828732876710010201000020200003003730037111002110910101000010000064000216222963010000103003830038300383003830038
1002430037225006129548251001010100001010000504277313103001830037300372828732876710010201000020200003003730037111002110910101000010000064000216222963010000103003830038300383003830038
1002430037225006129548251001010100001010000504277313103001830037300372828732876710010201000020200003003730037111002110910101000010000064000216222963010000103003830038300383003830038
1002430037225006129548251001010100001010000504277313003001830037300372828732876710010201000020200003003730037111002110910101000010000064000216222963010000103003830038300383003830038
1002430037225006129548251001010100001010000504277735103001830037300372828732876710010201000020200003003730037111002110910101000010000064000216222963010000103003830038300383003830038
10024300372250072629548251001010100001010000504277313103001830037300372828732876710010201000020200003003730037111002110910101000010010064000216222963010000103003830038300383003830038
100243003722500178929548251001010100001010000504277313003001830037300372828732876710010201000020200003003730037111002110910101000010000064000216222963010000103003830038300383008530038

Test 4: throughput

Count: 8

Code:

  sabdl v0.8h, v8.8b, v9.8b
  sabdl v1.8h, v8.8b, v9.8b
  sabdl v2.8h, v8.8b, v9.8b
  sabdl v3.8h, v8.8b, v9.8b
  sabdl v4.8h, v8.8b, v9.8b
  sabdl v5.8h, v8.8b, v9.8b
  sabdl v6.8h, v8.8b, v9.8b
  sabdl v7.8h, v8.8b, v9.8b
  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)0318191e3f51inst 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)9fa0a8acc2cfd5d6ddinst fetch restart (de)e0? int output thing (e9)? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
80204200601500004125801001008000010080000500640000200202003920039997339997801002008000020016000020039200391180201100991001008000010002005110216112003612800001002004020040200402004020040
802042003915000010052580100100800001008000050064000020020200392003999733999780100200800002001600002003920039118020110099100100800001000000511011611200360800001002004020040200402004020040
80204200391500005022580100100800001008000050064000020020200392003999733999780100200800002001600002003920039118020110099100100800001000000511011611200360800001002004020040200402004020040
802042003915000041258010010080000100800005006400002002020039200399973399978010020080000200160000200392003911802011009910010080000100001710511011611200360800001002004020040200402004020040
8020420039150000412580100100800001008000050064000020020200392003999733999780100200800002001600002003920039118020110099100100800001000000511011611200360800001002004020040200402004020040
8020420039150000412580100100800001008000050064000020020200392003999733999780100200800002001600002003920039118020110099100100800001000000511011611200360800001002004020040200402004020040
80204200391500004125801001008000010080000500640000200202003920039997339997801002008000020016000020039200391180201100991001008000010000360511011611200360800001002004020040200402004020040
80204200391500001084258010010080000100800005006400002002020039200399973399978010020080000200160000200392003911802011009910010080000100001530511011611200360800001002004020040200402004020040
8020420039150000412580100100800001008000050064000020020200392003999733999780100200800002001600002003920039118020110099100100800001000000511011611200360800001002004020040200402004020040
8020420039150000412580100100800001008000050064000020020200392003999733999780100200800002001600002003920039118020110099100100800001000000511011611200360800001002004020040200402004020040

1000 unrolls and 10 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)9fa8a9acbranch mispredict (cb)cfd5d6daddinst fetch restart (de)e0? fp/simd (ee)gpr retires (ef)f5f6f7f8fd
800242004015001222580010108000010800005064000002002020039200399996310019800102080000201600002003920039118002110910108000010000050204160552003680000102004020040200402004020040
800242003915006422580010108000010800005064000002002020039200399996310019800102080000201600002003920039118002110910108000010000050203160362003680000102004020040200402004020040
8002420039150012202580010108000010800005064000002002020039200399996310019800102080000201600002003920039118002110910108000010000050205160532003680000102004020040200402004020040
800242003915004462580010108000010800005064000002002020039200399996310019800102080000201600002003920039118002110910108000010000050205160532003680000102004020040200402004020040
8002420039150040258001010800001080000506400000200202003920039999631001980010208000020160000200392003911800211091010800001000144050205160532003680000102004020040200402004020040
80024200391500402580010108000010800005064000002002020039200399996310019800102080000201600002003920039218002110910108000010000050205160552003680000102004020040200402004020040
800242003915004025800101080000108000050640000020020200392003999963100198001020800002016000020039200391180021109101080000100012050205160532003680000102004020040200402004020040
8002420039150013525800101080000108000050640000020020200392003999963100198001020800002016000020039200391180021109101080000100057050203160652003680000102004020040200402004020040
80024200391500462580010108000010800005064000002002020039200399996310019800102080000201600002003920039118002110910108000010000050205160532003680000102004020040200402004020040
80024200391500462580010108000010800005064000002002020039200399996310019800102080000201600002003920039118002110910108000010000050205160542003680000102004020040200402004020040