Apple Microarchitecture Research by Dougall Johnson

M1/A14 P-core (Firestorm): Overview | Base Instructions | SIMD and FP Instructions
M1/A14 E-core (Icestorm):  Overview | Base Instructions | SIMD and FP Instructions

SQSUB (vector, 8H)

Test 1: uops

Code:

  sqsub v0.8h, 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 uop (01)cycle (02)031e3f4e51schedule uop (52)schedule simd uop (54)dispatch simd uop (57)ldst uops in schedulers (5b)60696d6emap stall dispatch (70)map rewind (75)map stall (76)dispatch uop (78)map simd uop (7e)map simd uop inputs (81)8283flush restart other nonspec (84)85inst all (8c)inst simd alu (9a)cfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)f5f6f7f8fd
1004303723061254825100010001000398313130183037303724153289510001000200030373037111001100073216222630100030383038303830383038
1004303723061254825100010001000398313130183037303724153289510001000200030373037111001100073216222630100030383038303830383038
1004303723061254825100010001000398313130183037303724153289510001000200030373037111001100073216222630100030383038303830383038
10043037225161254825100010001000398313130183037303724153289510001000200030373037111001100073216222630100030383038303830383038
1004303723061254825100010001000398313130183037303724153289510001000200030373037111001100073216222630100030383038303830383038
1004303723061254825100010001000398313130183037303724153289510001000200030373037111001100073216222630100030383038303830383038
1004303722061254825100010001000398313130183037303724153289510001000200030373037111001100073216222630100030383038303830383038
1004303723061254825100010001000398313130183037303724153289510001000200030373037111001100073216222630100030383038303830383038
1004303723061254825100010001000398313130183037303724153289510001000200030373037111001100073216222630100030383038303830383038
10043037231861254825100010001000398313130183037303724153289510001000200030373037111001100073216222630100030383038303830383038

Test 2: Latency 1->2

Code:

  sqsub v0.8h, 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 uop (01)cycle (02)03mmu table walk data (08)l2 tlb miss data (0b)1e1f3f4e51schedule uop (52)schedule int uop (53)schedule simd uop (54)dispatch int uop (56)dispatch simd uop (57)int uops in schedulers (59)ldst uops in schedulers (5b)6061696d6emap stall dispatch (70)map rewind (75)map stall (76)dispatch uop (78)map int uop (7c)map simd uop (7e)map int uop inputs (7f)map simd uop inputs (81)8283flush restart other nonspec (84)85inst all (8c)inst branch (8d)inst branch taken (90)inst branch cond (94)inst int alu (97)inst simd alu (9a)9fl1d cache writeback (a8)cfd0d2d5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? simd retires (ee)? int retires (ef)f5f6f7f8fd
102043003722500006129548251010010010000100100005004277313153001830037300372826532874510100200100002002000030037300371110201100991001001000010007105111611296340100001003003830038300383003830038
102043003722500006129548251010010010000100100005004277313153001830037300372826532874510100200100002002000030037300371110201100991001001000010007105111611296340100001003003830038300383003830038
102043003722500006129548251010010010000100100005004277313153001830037300372826532874510100200100002002000030037300371110201100991001001000010007105111611296340100001003003830038300383003830038
102043003722500006129548251010010010000100100005004277313153001830037300372826532874510100200100002002000030037300371110201100991001001000010007105111611296340100001003003830038300383003830038
102043003722400006129548251010010010000100100005004277313153001830037300372826532874510100200100002002000030037300371110201100991001001000010007105111611296340100001003003830038300383003830038
102043003722500006129548251010010010000100100005004277313153001830037300372826532874510100200100002002000030037300371110201100991001001000010007105111611296340100001003003830038300383003830038
102043003722501906129548251010010010000100100005004277313153005430037300372826532874510100200100002002000030037300371110201100991001001000010007105111611296340100001003003830038300383003830038
102043003722500006129548251010010010000100100005004277313153001830037300372826532874510100200100002002000030037300371110201100991001001000010007105111611296340100001003003830038300383003830038
102043003722500006129548251010010010000100100005004277313153001830037300372826532874510100200100002002000030037300371110201100991001001000010007105111611296340100001003003830038300383003830038
102043003722500006129548251010010010000100100005004277313153001830037300372826532874510100200100002002000030037300371110201100991001001000010007105111611296340100001003003830038300383003830038

1000 unrolls and 10 iterations

Result (median cycles for code): 3.0037

retire uop (01)cycle (02)03mmu table walk data (08)l2 tlb miss data (0b)18191e1f3f4e51schedule uop (52)schedule int uop (53)schedule simd uop (54)dispatch int uop (56)dispatch simd uop (57)int uops in schedulers (59)ldst uops in schedulers (5b)60696d6emap stall dispatch (70)map rewind (75)map stall (76)dispatch uop (78)map int uop (7c)map simd uop (7e)map int uop inputs (7f)map simd uop inputs (81)8283flush restart other nonspec (84)85inst all (8c)inst branch (8d)inst branch taken (90)inst branch cond (94)inst int alu (97)inst simd alu (9a)9fl1d tlb access (a0)ld unit uop (a6)st unit uop (a7)l1d cache writeback (a8)accfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? simd retires (ee)? int retires (ef)f5f6f7f8fd
1002430037225000000612954825100101010000101000050427731303001830037300372828732876710010201000020200003003730037111002110910101000010000006405163329630010000103003830038300383003830038
1002430037225000000822954825100101010000101000050427731303001830037300372828732876710010201000020200003003730037111002110910101000010000006403163329630010000103003830038300383003830038
100243003722400006510612954825100101010000101000050427731303001830084300842828732876710010201000020200003003730037111002110910101000010000006403163329630010000103003830038300383003830038
1002430037224000000612954825100101010000101000050427731303001830037300372828732876710010201000020200003003730037111002110910101000010000006403163329630010000103003830038300383003830038
1002430037225000000612954825100101010000101000050427731303001830037300372828732876710010201000020200003003730037111002110910101000010000006403163329630010000103003830038300383003830038
1002430037225000000612954825100101010000101000050427731303001830037300372828732876710010201000020200003003730037111002110910101000010000006403163329630010000103003830038300383003830038
1002430037225000000612954825100101010000101000050427731303001830037300372828732876710010201000020200003003730037111002110910101000010000006403163329630010000103003830038300383003830038
1002430037224000000612954825100101010000101000050427731303001830037300372828732876710010201000020200003003730037111002110910101000010000006403163329630010000103003830038300383003830038
1002430037225000000612954825100101010000101000050427731303001830037300372828732876710010201000020200003003730037111002110910101000010000066403163329630010000103003830038300383003830038
10024300372250000009122954825100101010000101000050427731303001830037300372828732876710010201000020200003003730037111002110910101000010000006403163329630010000103003830038300383003830038

Test 3: Latency 1->3

Code:

  sqsub v0.8h, 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 uop (01)cycle (02)03mmu table walk data (08)09l2 tlb miss data (0b)18191e1f3a3f4e51schedule uop (52)schedule int uop (53)schedule simd uop (54)dispatch int uop (56)dispatch simd uop (57)int uops in schedulers (59)ldst uops in schedulers (5b)60696d6emap stall dispatch (70)map rewind (75)map stall (76)dispatch uop (78)map int uop (7c)map simd uop (7e)map int uop inputs (7f)map simd uop inputs (81)8283flush restart other nonspec (84)85inst all (8c)inst branch (8d)inst branch taken (90)inst branch cond (94)inst int alu (97)inst simd alu (9a)9fl1d tlb access (a0)l1d tlb miss (a1)l1d cache writeback (a8)a9acc2branch cond mispred nonspec (c5)cfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? simd retires (ee)? int retires (ef)f5f6f7f8fd
102043003722500000000612954825101001001000010010000500427731303001830037300372826532874510100200100002002000030037300371110201100991001001000010000001350071021622296340100001003003830038300383003830038
1020430037225000000007262954825101001001000010010000500427731303001830037300372826532874510100200100002002000030037300371110201100991001001000010000001680071021622296340100001003003830038300383003830038
1020430037225000000006129548251010010010000100100005004277313130018300373003728265328745101002001000020020000300373003711102011009910010010000100000060171021622296340100001003003830038300383003830038
10204300372250000000072629548251010010010000100100005004277313130054300373003728265328745101002001000020020000300373003711102011009910010010000100000060071021622296340100001003003830038300383003830038
10204300372250000000025129548251010010010000100100005004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100000030071021622296340100001003003830038300383003830038
1020430037225000000006129548251010010010000100100005004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100000030071021622296340100001003003830038300383003830038
1020430037225000000006129548251010010010000100100005004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100000030071021622296340100001003003830038300383003830038
1020430037225000000006129548251010010010000100100005004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100000000071021622296340100001003003830038300383003830038
10204300372250000000061295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000000870071021622296340100001003003830038300383003830038
1020430037225000000006129548251010010010000100100005004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100000030071021622296340100001003003830038300383003830038

1000 unrolls and 10 iterations

Result (median cycles for code): 3.0037

retire uop (01)cycle (02)03mmu table walk data (08)18191e1f3f4e51schedule uop (52)schedule int uop (53)schedule simd uop (54)dispatch int uop (56)dispatch simd uop (57)int uops in schedulers (59)ldst uops in schedulers (5b)60696d6emap stall dispatch (70)map rewind (75)map stall (76)dispatch uop (78)map int uop (7c)map simd uop (7e)map int uop inputs (7f)map simd uop inputs (81)8283flush restart other nonspec (84)85inst all (8c)inst branch (8d)inst branch taken (90)inst branch cond (94)inst int alu (97)inst simd alu (9a)9fld unit uop (a6)l1d cache writeback (a8)accfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)? int retires (ef)f5f6f7f8fd
100243003722500000612954825100101010000101000050427731313001830037300372828732876710010201000020200003003730037111002110910101000010000640216222963010000103003830038300383003830038
100243003722500000612954825100101010000101000050427731313001830037300372828732876710010201000020200003003730037111002110910101000010000640216222963010000103003830038300383003830038
100243003722500000612954843100221010000101000050427731313001830037300372828732876710010201000020200003003730037111002110910101000010000640216222963010000103003830038300383003830038
100243003722500000612954825100101010000101000050427731313001830037300372828732876710010201000020200003003730037111002110910101000010000640216222963010000103003830038300383003830038
100243003722500000612954825100101010000101000050427731313001830037300372828732876710010201000020200003003730037211002110910101000010000640216222963010000103003830038300383003830038
100243003722500000612954825100101010000101000050427731313001830037300372828732876710010201000020200003003730037111002110910101000010000640216222963010000103003830038300383003830038
100243003722500000612954825100101010000101000050427731313001830037300372828732876710010201000020200003003730037111002110910101000010003640216222963010000103003830038300383003830038
100243003722500000612954825100101010008101000050427731313001830037300372828732876710010201000020200003003730037111002110910101000010000640216222963010000103003830038300383003830038
100243003722500000612954825100101010000101000050427731313001830037300372828732876710010201000020200003003730037111002110910101000010000640216222963010000103003830038300383003830038
100243003722500000612954825100101010000101000050427731313001830037300372828732876710010201000020200003003730037111002110910101000010000640216222963010000103003830038300383003830038

Test 4: throughput

Count: 8

Code:

  sqsub v0.8h, v8.8h, v9.8h
  sqsub v1.8h, v8.8h, v9.8h
  sqsub v2.8h, v8.8h, v9.8h
  sqsub v3.8h, v8.8h, v9.8h
  sqsub v4.8h, v8.8h, v9.8h
  sqsub v5.8h, v8.8h, v9.8h
  sqsub v6.8h, v8.8h, v9.8h
  sqsub v7.8h, 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 uop (01)cycle (02)03mmu table walk data (08)09l2 tlb miss data (0b)191e3f51schedule uop (52)schedule int uop (53)schedule simd uop (54)dispatch int uop (56)dispatch simd uop (57)int uops in schedulers (59)ldst uops in schedulers (5b)60696d6emap stall dispatch (70)map rewind (75)map stall (76)dispatch uop (78)map int uop (7c)map simd uop (7e)map int uop inputs (7f)map simd uop inputs (81)8283flush restart other nonspec (84)85inst all (8c)inst branch (8d)inst branch taken (90)inst branch cond (94)inst int alu (97)inst simd alu (9a)9fl1d cache writeback (a8)a9accdcfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)? int retires (ef)f5f6f7f8fd
802042005915000000412580100100800001008000050064000002002020039200399973399978010020080000200160000200392003911802011009910010080000100000051102161120036800001002004020040200402004020040
8020420039150000004125801001008000010080000500640000120020200392003999733999780100200800002001600002003920039118020110099100100800001001806051101161120036800001002004020040200402004020040
802042003915000000412580100100800001008000050064000002002020039200399973399978010020080000200160000200392003911802011009910010080000100000051101161120036800001002004020040200402004020040
802042003915000000416680204116800981058010462664081612002020039200399973399978010020080098200160198200982009821802011009910010080000100492521051281161120036800001002004020040200402004020040
80204200391501100026825801001008000010080000500640000020020200392003999733999780100200800002001600002003920039118020110099100100800001002609051101161120036800001002004020040200402004020040
80204200391500000370625801001008000010180000500640000120020200392003999733999780100200800002001600002003920039118020110099100100800001001903051101161120036800001002004020040200402004020040
8020420039150000004125801001008000010080000500640000020020200392003999733999780100200800002001600002003920039118020110099100100800001005603051101161120036800001002004020040200402004020040
802042003915000000412580100100800001008000050064000002002020039200399973399978010020080000200160000200392003911802011009910010080000100000051101161120036800001002004020040200402004020040
8020420039150000004125801001008000010080000500640000020020200392003999733999780100200800002001600002003920039118020110099100100800001003203051101161120036800001002004020040200402004020040
802042003915000000412580100100800001008000050064000002002020039200399973399978010020080000200160000200392003911802011009910010080000100000051101161120036800001002004020040200402004020040

1000 unrolls and 10 iterations

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

retire uop (01)cycle (02)03mmu table walk data (08)18191e3a3f51schedule uop (52)schedule int uop (53)schedule simd uop (54)dispatch int uop (56)dispatch simd uop (57)int uops in schedulers (59)ldst uops in schedulers (5b)6061696d6emap stall dispatch (70)map rewind (75)map stall (76)dispatch uop (78)map int uop (7c)map simd uop (7e)map int uop inputs (7f)map simd uop inputs (81)8283flush restart other nonspec (84)85inst all (8c)inst branch (8d)inst branch taken (90)inst branch cond (94)inst int alu (97)inst simd alu (9a)9fl1d tlb miss (a1)ld unit uop (a6)l1d cache writeback (a8)a9accfd0d2d5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? simd retires (ee)? int retires (ef)f5f6f7f8fd
80024200481500000040258001010800001080000506400000020020200392003999963100198001020800002016000020039200391180021109101080000100020035020005162420036080000102004020040200402004020040
8002420039150000004025800101080000108000050640000102002020039200399996310019800102080000201600002003920039118002110910108000010000005020502162420036080000102004020040200402004020040
8002420039150000004025800101080000108000050640000102002020039200399996310019800102080000201600002003920039118002110910108000010002005020003163420036080000102004020040200402004020040
8002420039150000004025800101080000108000050640000102002020039200399996310019800102080000201600002003920039118002110910108000010002005020004162420036080000102004020040200402004020040
8002420039150000004025800101080000108000050640000052002020039200399996310019800102080000201600002003920039118002110910108000010001005020002164220036080000102004020040200402004020040
8002420039150000004025800101080000108000050640000102002020039200399996310019800102080000201600002003920039118002110910108000010000005020504164220036080000102004020040200402004020040
8002420039150000004025800101080000108000050640000052002020039200399996310019800102080000201600002003920039118002110910108000010001005020004162420036080000102004020040200402004020040
80024200391500000051525800101080000108000050640000052002020039200399996310019800102080000201600002003920039118002110910108000010003035020004162420036080000102004020040200402004020040
8002420039150000004025800101080000108000050640000102002020039200399996310019800102080000201600002003920039118002110910108000010000005020004164220036080000102004020040200402004020040
8002420039150000004025800101080000108000050640000052002020039200399996310019800102080000201600002003920039118002110910108000010002005020004164220036080000102004020040200402004020040