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 (scalar, S)

Test 1: uops

Code:

  sqsub s0, s0, s1
  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)accfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)f5f6f7f8fd
10043037220612548251000100010003983131301830373037241532895100010002000303730371110011000073116112630100030383038303830383038
10043037230612548251000100010003983131301830373037241532895100010002000303730371110011000073116112630100030383038303830383038
10043037230612548251000100010003983131301830373037241532895100010002000303730371110011000073116112630100030383038303830383038
10043037230612548251000100010003983131301830373037241532895100010002000303730371110011000073116112630100030383038303830383038
10043037230612548251000100010003983131301830373037241532895100010002000303730371110011000073116112630100030383038303830383038
10043037230612548251000100010003983131301830373037241532895100010002000303730371110011000073116112630100030383038303830383038
100430372299842548251000100010003983131301830373037241532895100010002000303730371110011000073116112630100030383038303830383038
10043037220612548251000100010003983131301830373037241532895100010002000303730371110011000073116112630100030383038303830383038
10043037230612548251000100010003983131301830373037241532895100010002000303730371110011000073116112630100030383038303830383038
10043037220612548251000100010003983131301830373037241532895100010002000303730371110011000073116112630100030383038303830383038

Test 2: Latency 1->2

Code:

  sqsub s0, s0, s1
  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)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)l1d tlb miss (a1)ld unit uop (a6)st unit uop (a7)l1d cache writeback (a8)a9acc2branch cond mispred nonspec (c5)branch mispred nonspec (cb)cdcfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? simd retires (ee)? int retires (ef)f5f6f7f8fd
102043003722500000061295482510100100100001001000050042773131300183003730037282653287451010020010000200200003003730037111020110099100100100001000000000000071011611296340100001003003830038300383003830038
102043003722500000061295482510100100100001001000050042773131300183003730037282653287451010020010000200200003003730037111020110099100100100001000000000000071011611296340100001003003830133300383003830038
102043003722500000061295482510100100100001001000050042773131300183003730037282653287451010020010000200200003003730037111020110099100100100001000000000000071011611296340100001003003830038300383003830038
102043003722500000061295482510100100100001001000050042773131300183003730037282653287451010020010000200200003003730037111020110099100100100001000000000000071011611296340100001003003830038300383003830038
10204300372250000117061295482510100100100001001000050042773131300183003730037282653287451010020010000200200003003730037111020110099100100100001000000009000071011611296340100001003003830038300383003830038
10204300372250000630103295482510100100100001001000050042773131300183003730037282653287451010020010000200200003003730037111020110099100100100001000000000000071011611296340100001003003830038300383003830038
102043003722500000061295482510100100100001001000050042773131300183003730037282653287451010020010000200200003003730037111020110099100100100001000000000000071011611296340100001003003830038300383003830038
1020430037225001200189295482510100100100001001000050042773131300183003730037282653287451010020010000200200003003730037111020110099100100100001000000000000071011611296340100001003003830038300383003830038
102043003722500000061295482510100100100001001000050042773131300183003730037282653287451010020010000200200003003730037111020110099100100100001000000000000071011611296340100001003003830038300383003830038
102043003722500000061295482510100100100001001000050042773131300183003730037282653287451010020010000200200003003730037111020110099100100100001000000000000071011611296340100001003003830038300383003830038

1000 unrolls and 10 iterations

Result (median cycles for code): 3.0037

retire uop (01)cycle (02)03mmu table walk instruction (07)mmu table walk data (08)l2 tlb miss instruction (0a)l2 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)ld unit uop (a6)st unit uop (a7)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
10024300372251010000026829548251001010100001010000504277313130018300373003728287328767100102010000202000030037300371110021109101010000100000003900644524101129630010000103003830038300383003830038
10024300372251010000026829548251001010100001010000504277313130018300373003728287328767100102010000202000030037300371110021109101010000100000000006441016101029630010000103003830038300383003830038
10024300372251010000026829548251001010100001010000504277313130018300373003728287328767100102010000202000030037300371110021109101010000100000000006441016101029630010000103003830038300383003830038
1002430037225101000462026829548251001010100001010000504277313030018300373003728287328767100102010000202000030037300371110021109101010000100000000006441016101029630010000103003830038300383003830038
10024300372251010000026829548251001010100001010000504277313030018300373003728287328767100102010000202000030037300371110021109101010000100000000006448168829630010000103003830038300383003830038
1002430037225101000002682954825100101010000101000050427731303001830037300372828732876710010201000020200003003730037111002110910101000010000000000644516101029630010000103003830038300383003830038
1002430037225101000002177295482510010101000010100005042773130300183003730037282873287671001020100002020000300373003711100211091010100001000000000064410168529630010000103003830038300383003830038
1002430037224101000105026829548251001010100001010000504277313030018300373003728287328767100102010000202000030037300371110021109101010000100000000006441116101029630010000103003830038300383003830038
10024300372251010000026829548251001010100001010000504277313130018300373003728287328767100102010000202000030037300371110021109101010000100000000006441016101029630010000103003830038300383003830038
10024300372251010000026829548251001010100001010000504277313030018300373003728287328767100102010000202000030037300371110021109101010000100000000207751286111429738610000103032330369303693022430405

Test 3: Latency 1->3

Code:

  sqsub s0, s1, s0
  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)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)696d6emap 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)accdcfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)? int retires (ef)f5f6f7f8fd
102043003722500000061295482510100100100001001000050042773133001830037300372826532874510100200100002002000030037300371110201100991001001000010001007101161129634100001003003830038300383003830038
102043003722500000061295482510100100100001001000050042773133001830037300372826532874510100200100002002000030037300371110201100991001001000010001007101161129634100001003003830038300383003830038
102043003722500000061295482510100100100001001000050042773133001830037300372826532874510100200100002002000030037300371110201100991001001000010002214117101161129634100001003003830038300383003830038
1020430037225000000612954825101001001000011610000500427731330018300373003728265328745101002001000020020000300373003711102011009910010010000100022007101161129634100001003003830038300383003830038
102043003722500000061295482510100100100001001000050042773133001830037300372826532874510100200100002002000030037300371110201100991001001000010001007101161129634100001003003830038300383003830038
102043003722500000061295482510100100100001001000050042773133001830037300372826532874510100200100002002000030037300371110201100991001001000010000007101161129634100001003003830038300383003830038
102043003722500000061295482510100100100001001000050042773133001830037300372826532874510100200100002002000030037300371110201100991001001000010001007101161129634100001003003830038300383003830038
1020430037225000000612954825101001001000010010000500427731330018300373003728265328745101002001000020020000300373003711102011009910010010000100042607101161129634100001003003830038300383003830038
1020430037224000027061295482510100100100001001000050042773133001830037300372826532874510100200100002002000030037300371110201100991001001000010000007101161129634100001003003830038300383003830134
102043003722500000061295482510100100100001001000050042773133001830037300372826532874510100200100002002000030037300371110201100991001001000010002007101161129634100001003003830038300383003830038

1000 unrolls and 10 iterations

Result (median cycles for code): 3.0037

retire uop (01)cycle (02)031e3f4e51schedule 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)cfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)? int retires (ef)f5f6f7f8fd
1002430037225061295482510010101000010100005042773130300183003730037282873287671001020100002020000300373003711100211091010100001000640216222963010000103003830038300383003830038
1002430037225061295482510010101000010100005042773130300183003730037282873287671001020100002020000300373003711100211091010100001000640216222970010000103003830038300383003830038
10024300372250916295482510010111000010100005042773130300183003730037282873287671001020100002020000300373003711100211091010100001000640216222963010000103003830038300383003830038
10024300372251261295482510010101000010101495042773130300183003730037282873287671001020100002020000300373003711100211091010100001000640516222963010000103003830038300383003830038
1002430037225061295482510010101000010100005042773130300183003730037282873287671001020100002020000300373003711100211091010100001000640216222963010000103003830038300383003830038
1002430037225061295482510010101000010100005042773131300183003730037282873287671001020100002020000300373003711100211091010100001000640216222963010000103003830038300383003830038
1002430037225082295482510010101000010100005042773130300183003730037282873287671001020100002020000300373003711100211091010100001000640216222963010000103003830038300383003830038
1002430037225061295482510010101000010100005042773130300183003730037282873287671001020100002020000300373003711100211091010100001000640216222963010000103003830038300383003830038
1002430037225061295482510010101000010100005042773130300183003730037282873287671001020100002020000300373003711100211091010100001000640216222963010000103003830038300383003830038
1002430037224061295482510010101000010100005042773131300183003730037282873287671001020100002020000300373003711100211091010100001000640216223003410000103003830038300383003830038

Test 4: throughput

Count: 8

Code:

  sqsub s0, s8, s9
  sqsub s1, s8, s9
  sqsub s2, s8, s9
  sqsub s3, s8, s9
  sqsub s4, s8, s9
  sqsub s5, s8, s9
  sqsub s6, s8, s9
  sqsub s7, s8, s9
  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)03l2 tlb miss data (0b)3f51schedule 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)accdcfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)? int retires (ef)f5f6f7f8fd
802042005815004555258010010080000100800005006400000200202003920039997339997801002008000020016000020039200391180201100991001008000010020051104161120036800001002004020040200402004020040
8020420039150141258010010080000100800005006400001200202003920039997339997801002008000020016000020039200391180201100991001008000010000051101161120036800001002004020040200402004020040
8020420039150041258010010080000100800005006400001200202003920039997339997801002008000020016000020039200391180201100991001008000010010051101161120036800001002004020040200402004020040
8020420039150041258010010080000100800005006400000200202003920039997339997801002008000020016000020039200391180201100991001008000010000051101161120036800001002004020040200402004020040
8020420039150041258010010080000100800005006400001200202003920039997339997801002008000020016000020039200391180201100991001008000010013051101161120036800001002004020040200402004020040
8020420039150041258010010080000100800005006400001200202003920039997339997801002008000020016000020039200391180201100991001008000010000051101161120036800001002004020040200402004020040
802042003915004125801001008000010080000500640000020020200392003999733999780100200800002001600002003920039118020110099100100800001004669051101161120036800001002004020040200402004020040
80204200391500412580100100800001008000050064000012002020039200399973399978010020080000200160000200392003911802011009910010080000100318051101161120036800001002004020040200402004020040
8020420039150041258010010080000100800005006400000200202003920039997339997801002008000020016000020039200391180201100991001008000010000051101161120036800001002004020040200402004020040
8020420039150041258010010080000100800005006400001200202003920039997339997801002008000020016000020039200391180201100991001008000010000051101161120036800001002004020040200402004020040

1000 unrolls and 10 iterations

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

retire uop (01)cycle (02)031e3f51schedule 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)5f60696d6emap 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 cache writeback (a8)acbranch cond mispred nonspec (c5)branch mispred nonspec (cb)cfd0d2l1i cache miss demand (d3)d5map dispatch bubble (d6)ddfetch restart (de)e0ea? simd retires (ee)? int retires (ef)f5f6f7f8fd
8002420048150040258001010800001080000506400000120020200392003999963100198001020800002016000020039200391180021109101080000100830050200005163220036080000102004020040200402004020040
800242003915004025800101080000108000050640000012002020039200399996310019800102080000201600002003920039118002110910108000010001380050200003163220036080000102004020040200402004020040
8002420039150040258001010800001080000506400000120020200392003999963100198001020800002016000020039200391180021109101080000100030250200003163220036080000102004020040200402004020040
8002420039150040258001010800001080000506400000120020200392003999963100198001020800002016000020039200391180021109101080000100930050200003163320036080000102004020040200402004020040
8002420039150040258001010800001080000506400000120020200392003999963100198001020800002016000020039200391180021109101080000100060050200005163420036080000102004020040200402004020040
800242003915013540258001010800001080000506400000120020200392003999963100198001020800002016000020039200391180021109101080000104000050200003163220036080000102004020040200402004020040
8002420039150040258001010800001080000506400000120020200392003999963100198001020800002016000020039200391180021109101080000100130050200003165820036080000102004020040200402004020040
8002420039150040258001010800001080000506400000120020200392003999963100198001020800002016000020039200391180021109101080000100000050200003165520036080000102004020040200402004020040
8002420039150940258001010800001080000506400000120020200392003999963100198001020800002016000020039200391180021109101080000100300050200006165620036080000102004020040200402004020040
8002420039150040258001010800001080000506400000120020200392003999963100198001020800002016000020039200391180021109101080000100130050200003163220036080000102004020040200402004020040