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

SUBHN (vector, 4S)

Test 1: uops

Code:

  subhn v0.4h, v0.4s, v1.4s
  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)031e1f3f4e51schedule 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)l1d cache writeback (a8)acc2cfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)f5f6f7f8fd
10043037220061254825100010001000398313030183037303724153289510001000200030373037111001100000073116112630100030383038303830383038
10043037230061254825100010001000398313030183037303724153289510001000200030373037111001100000073116112630100030383038303830383038
100430372330061254825100010001000398313030183037303724153289510001000200030373037111001100003073116112630100030383038303830383038
10043037233061254825100010001000398313030183037303724153289510001000200030373037111001100000073116112630100030383038303830383038
10043037230061254825100010001000398313030223037303724153289510001000200030373037111001100000073116112630100030383038303830383038
10043037220082254825100010001000398313030183037303724153289510001000200030373037111001100000073116112630100030383038303830383038
10043037220061254825100010001000398313030183037303724153289510001000200030373037111001100000073116112630100030383038303830383038
10043037230061254825100010001000398313130183037303724153289510001000200030373037111001100000073116112630100030383038303830383038
10043037230061254825100010001000398313030183037303724153289510001000200030373037111001100013073116112630100030383038303830383038
10043037230061254825100010001000398313130183037303724153289511491000200030373037111001100023073116112630100030383038303830383038

Test 2: Latency 1->2

Code:

  subhn v0.4h, v0.4s, v1.4s
  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)0918191e3f4e51schedule 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)l1d cache writeback (a8)a9acc2cfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? simd retires (ee)? int retires (ef)f5f6f7f8fd
1020430037225000006129548251010010010000100100005004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100000000071021622296340100001003003830038300383003830038
1020430037224000006129548251010010010000100100005004277313130018300853003728269328745101002001000020020000300373003711102011009910010010000100000000071021622296340100001003003830038300383003830038
10204300372250000072629548251010010010000100100005004277313130018300373003728265328745101002001000020020000300373003711102011009910010010000100000000071021622296340100001003003830038300383003830038
1020430037225000006129548251010010010000100100005004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100000003071021622296340100001003003830038300383003830038
1020430037225000006129548251010010010000100100005004277313130018300373003728265328745101002001000020020000300373003711102011009910010010000100000000071021622296340100001003003830038300383003830038
1020430037225000006129548251010010010000100100005004277313130018300373003728265328745101002001000020020000300373003711102011009910010010000100000000071021622296340100001003003830038300383003830038
1020430037225100006129548251010010010000100100005004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100000000071021622296340100001003003830038300383003830038
1020430037225000006129548251010010010000100100005004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100000000071021622296340100001003003830038300383003830038
1020430037225000006129548251010010010000100100005004277313130018300373003728265328745101002001000020020000300373003711102011009910010010000100000000071021622296340100001003003830038300383003830038
1020430037225000006129548251010010010000100100005004277313130018300373003728265328745101002001000020020000300373003711102011009910010010000100000000071021622296340100001003003830038300383003830038

1000 unrolls and 10 iterations

Result (median cycles for code): 3.0037

retire uop (01)cycle (02)03mmu table walk data (08)09l2 tlb miss data (0b)181e3f4e51schedule 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)696b6d6emap 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)9faccfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)? int retires (ef)f5f6f7f8fd
1002430037225000006129548251001010100001010000504277313300540300373003728287328767100102010000202000030037300371110021109101010000100640216222963010000103003830038300383003830038
10024300372260000246129548251001010100001010000504277313300180300373003728287328767100102010000202000030037300371110021109101010000100640216222963010000103003830038300383003830038
1002430037225000006129548251001010100001010000504277313300180300373003728287328767100102010000202000030037300371110021109101010000100640216222963010000103003830038300383003830038
1002430037225000006129548251001010100001010000504277313300180300373003728287328767100102010000202000030037300371110021109101010000100640216222963010000103003830038300383003830038
1002430037225000006129548251001010100001010000504277313300180300373003728287328767100102010000202000030037300371110021109101010000100640116222963010000103003830038300383003830038
1002430037225000006129548251001010100001010000504277313300180300373003728287328767100102010000202000030037300371110021109101010000100640216222963010000103003830038300383003830038
1002430037225000006129548251001010100001010000504277313300180300373003728287328767100102010000202000030037300371110021109101010000100640216222963010000103003830038300383003830038
1002430037225000006129548251001010100001010000504277313300180300373003728287328767100102010000202000030037300371110021109101010000100640216222963010000103003830038300383003830038
1002430037225000006129548251001010100001010000504277313300180300373003728287328767100102010000202000030037300371110021109101010000100640216222963010000103003830038300383003830038
1002430037225000006129548251001010100001010000504277313300180300373003728287328767100102010000202000030037300371110021109101010000100640216222963010000103003830038300383003830038

Test 3: Latency 1->3

Code:

  subhn v0.4h, v1.4s, v0.4s
  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)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 miss (a1)l1d cache writeback (a8)a9accfd0d5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? simd retires (ee)? int retires (ef)f5f6f7f8fd
1020430037225061295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000000710011611296340100001003003830038300383003830038
1020430037225061295482510100100100001001000050042773131300183003730037282653287451010020010000200200003003730037111020110099100100100001000000710011611296340100001003003830038300383003830038
1020430037225082295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000000710011611296340100001003003830038302273003830038
1020430037225061295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000000710011611296340100001003003830038300383003830038
1020430037225061295482510100100100001001000050042773131300183003730037282653287451010020010000200200003003730037111020110099100100100001000200710011611296340100001003003830038300383003830038
1020430037225061295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000000710011611296340100001003003830038300383003830038
1020430037224961295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000000710011611296340100001003003830038300383003830038
10204300372254561295482510100100100001001000050042773131300183003730037282653287451010020010000200200003003730037111020110099100100100001000000710011611296340100001003003830170300383003830038
1020430037225061295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000000710011611296340100001003003830038300383003830038
1020430037225061295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000000710011610296340100001003003830038300383003830038

1000 unrolls and 10 iterations

Result (median cycles for code): 3.0037

retire uop (01)cycle (02)0309l2 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 cache writeback (a8)acc2cfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)? int retires (ef)f5f6f7f8fd
1002430037233000000050329548251001010100001010000504277313130018300373003728287328767100102010000202000030085300853110021109101010000100600640216222963010000103003830038300383003830038
1002430037225000090061295482510010101000010100005042773131300183003730037283013287671001020100002020000300373003711100211091010100001002200640216222963010000103003830038300383003830038
100243003722500001200612954825100101010000101000050427731313001830037300372828719287671001020100002020000300373003711100211091010100001006100640216222963010000103003830038300383003830038
1002430037225000000094329548251001010100001010000504277313130018300373003728287328767100102010000202000030037300371110021109101010000100030640216222963010000103003830085300383003830038
1002430037225000000061295482510010101000010100005042773131300183003730037282873287671001020100002020000300373003711100211091010100001001900640216222963010000103003830038300383003830038
1002430037225000000061295482510010101000010100005042773131300183003730037282873287671001020100002020000300373003711100211091010100001004200640216222963010000103003830038300383003830038
1002430037225000000061295482510010101000010100006042773131300183003730037282873287671001020100002020000300373003711100211091010100001002600640216222963010000103003830038300383003830038
10024300372251000411352061295482510010101000010100005042773131300183003730037282873287671001020100002020000300373003711100211091010100001001000640249222963010000103003830038300383003830038
100243003722500000006129548841001010100001010000504277313130018300373003728287328841100102010000202000030037300371110021109101010000100290640216222963010000103003830038300383003830038
1002430037224000000069029548251001010100001010000504277313130018300373003728287328767100102010000202000030037300371110021109101010000100100640216222963010000103003830038300383003830038

Test 4: throughput

Count: 8

Code:

  subhn v0.4h, v8.4s, v9.4s
  subhn v1.4h, v8.4s, v9.4s
  subhn v2.4h, v8.4s, v9.4s
  subhn v3.4h, v8.4s, v9.4s
  subhn v4.4h, v8.4s, v9.4s
  subhn v5.4h, v8.4s, v9.4s
  subhn v6.4h, v8.4s, v9.4s
  subhn v7.4h, v8.4s, v9.4s
  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)1e3f51schedule 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)60696b6d6emap 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)acc2branch cond mispred nonspec (c5)cdcfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? simd retires (ee)? int retires (ef)f5f6f7f8fd
80204200581500200412580100100800001008000050064000002002002003920039997339997801002008000020016000020039200391180201100991001008000010030000511031611200360800001002004020040200402004020040
80204200391500000412580100100800001008000050064000012002002003920039997339997801002008000020016000020039200391180201100991001008000010000000511011611200360800001002004020040200402004020040
8020420039150000010862580100100800001008000050064000012002002003920039997339997801002008000020016000020039200391180201100991001008000010010000511011611200360800001002004020040200402004020040
80204200391500000412580100100800001008000050064000012002002003920039997339997801002008000020016000020039200391180201100991001008000010010000511011611200360800001002004020040200402004020040
802042003915000004125801001008000010080000500640000120020320039200399973399978010020080000200160000200392003911802011009910010080000100024000511011611200360800001002004020040200402004020040
80204200391500000412580100100800001008000050064000002002002003920039997339997801002008000020016000020039200392180201100991001008000010000000511011611200360800001002004020040200402004020040
80204200391500000412580100100800001008000050064000002002002003920039997339997801002008000020016000020039200391180201100991001008000010010000511011611200360800001002004020040200402004020040
802042003915000004125801001008000010080000500640000020020020039200399973310025801002008000020016000020039200391180201100991001008000010010000511011611200360800001002004020040200402004020040
80204200391500000412580100100800001008000050064000002002002003920039997339997801002008000020016000020039200391180201100991001008000010000000511011611200360800001002004020040200402004020040
80204200391500000415080100100800001008000050064000002002002003920039997339997801002008000020016000020039200391180201100991001008000010010000511011611200360800001002004020040200402004020040

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)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)a9acc2cdcfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)? int retires (ef)f5f6f7f8fd
800242004815004025800101080000108000050640000120020200392003910011310019800102080000201600002003920039118002110910108000010000005020316322003680000102004020040200402004020040
80024200391500402580010108000010800005064000012002020039200399996310019800102080000201600002003920039118002110910108000010000005020316322003680000102004020040200402004020040
800242003915004025800101080000108000050640000120020200392003999963100198001020800002016000020039200391180021109101080000100021005020316322003680000102004020040200402004020040
800242003915007052580010108000010800005064000002002020039200399996310019800102080000201600002003920039118002110910108000010109005020216332003680000102004020040200402004020040
80024200391500402580010108000010800005064000012002020039200399996310019800102080000201600002003920039118002110910108000010003005020316232003680000102004020040200402004020040
80024200391500402580010108000010800005064000002002020039200399996310019800102080000201600002003920039118002110910108000010100005020316332003680000102004020040200402004020040
80024200391500402580010108000010800005064000002002020039200399996310019800102080000201600002003920039118002110910108000010103005020216322003680000102004020040200402004020040
80024200391500402580010108000010800005064000002002020039200399996310019800102080000201600002003920039118002110910108000010000005020216332003680000102004020040200402004020040
800242003915002582580010108000010800005064000012002020039200399996310019800102080000201600002003920039118002110910108000010100005020316232003680000102004020040200402004020042
80024200391500402580010108000010800005064000012002020039200399996310019800102080000201600002003920039118002110910108000010000005020316332003680000102004020040200402004020040