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

SQRDMULH (by element, 8H)

Test 1: uops

Code:

  sqrdmulh v0.8h, v0.8h, v1.h[1]
  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)03191e1f3f4e51schedule 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)accfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)f5f6f7f8fd
10043037220006125482510001000100039831313018303730372415328951000100020003037303711100110000373116112630100030383038303830383038
10043037230006125482510001000100039831313018303730372415328951000100020003037303711100110000973116112630100030383038303830383038
100430372300025125482510001000100039831313018303730372415328951000100020003037303711100110000073116112630100030383038303830383038
10043037230006125482510001000100039831313018303730372415328951000100020003037303711100110000073116112630100030383038303830383038
10043037230006125482510001000100039831313018303730372415328951000100020003037303711100110003073116112630100030383038303830383038
100430372300010625482510001000100039831313018303730372415328951000100020003037303711100110000073116112630100030383038303830383038
10043037220006125482510001000100039831313018303730372415328951000100020003037303711100110000073116112630100030383038303830383038
10043037280006125482510001000100039831313018303730372415328951000100020003037303711100110004073116112630100030383038303830383038
100430372300061254825100010001000398313130183037303724153289510001000200030373037111001100013673116112630100030383038303830383038
100430372302106125482510001000100039831313018303730372415328951000100020003037303711100110003973116112630100030383038303830383038

Test 2: Latency 1->2

Code:

  sqrdmulh v0.8h, v0.8h, v1.h[1]
  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 access (a0)l1d tlb miss (a1)ld unit uop (a6)l1d cache writeback (a8)accfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? simd retires (ee)? int retires (ef)f5f6f7f8fd
10204300372250145295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000000071011611296340100001003003830038300383003830038
10204300372250440295482510100100100001001000050042773131300183003730037282653287451010020010000200200003003730037111020110099100100100001000000071011611296340100001003003830038300383003830038
10204300372250401295482510100100100001001000050042773131300183003730037282653287451010020010000200200003003730037111020110099100100100001000000071011611296340100001003003830038300383003830038
102043003722501604295482510100100100001001000050042773131300183003730037282653287451010020010000200200003003730037111020110099100100100001000000071011611296340100001003003830038300383003830038
10204300372250437295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000000071011611296340100001003003830038300383003830038
10204300372250896295302510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000000071011611296340100001003003830038300383003830038
10204300372250422295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000000071011611296340100001003003830038300383003830038
10204300372250447295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000000071011611296340100001003003830038300383003830038
10204300372240465295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000000071011611296340100001003003830038300383003830038
102043003722501047295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000000071011611296340100001003003830038300383003830038

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)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)9fl1d tlb access (a0)l1d tlb miss (a1)ld unit uop (a6)l1d cache writeback (a8)a9accfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? simd retires (ee)? int retires (ef)f5f6f7f8fd
1002430037225000000612954825100101010000101000050427731330018300373003728287328767100102010000202000030037300371110021109101010000100000006402162229630010000103003830038300383003830038
1002430037225000000612954825100101010000101000050427731330018300373003728287328767100102010000202000030037300371110021109101010000100000006402162229630010000103003830038300383003830038
1002430037225000000612954825100101010000101000050427731330018300373003728287328767100102010000202000030037300371110021109101010000100000006402162229630010000103003830038300383003830038
1002430037225000000612954825100101010000101000050427731330018300373003728287328767100102010000202000030037300371110021109101010000100000006402162229630010000103003830038300383003830038
1002430037225000000822954825100101010016131000050427731330018300373003728287328767100102010000202000030037300371110021109101010000100002006402162229630010000103003830038300383003830038
1002430037225000000612954825100101010000101000050427731330018300373003728287328788100102010000202000030037300371110021109101010000100000006402162229630010000103003830038300383003830038
1002430037225000000612954825100101010000101000050427731330018300373003728287328767100102010000202000030037300371110021109101010000100000006402162229630010000103013430038300383003830038
1002430037225000000612954825100101010000101000050427731330018300373003728287328767100102010000202000030037300371110021109101010000100000006402162229630010000103003830038300383003830038
1002430037225000000612954825100101010000101000050427731330018300373003728287328767100102010000202000030037300371110021109101010000100000006402162229630010000103003830038300383003830038
1002430037225000000612954825100101010000101014850427731330018300373003728287328767100102010000202000030037300371110021109101010000100000006402162229630010000103003830038300383003830038

Test 3: Latency 1->3

Code:

  sqrdmulh v0.8h, v1.8h, v0.h[1]
  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)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)60696b6d6emap stall dispatch (70)simd prf full (72)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)a9acbranch cond mispred nonspec (c5)cfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? simd retires (ee)? int retires (ef)f5f6f7f8fd
1020430037225000237295482510100100100001001000050042773130300180300373003728265032874510100200100002002000030037300371110201100991001001000010000000071011611296340100001003003830038300383003830038
1020430037225000438295482510100100100001001000050042773130300180300373003728265032874510100200100002002000030037300371110201100991001001000010000000071011611296340100001003003830038300383003830038
10204300372250001492954825101001001000010010000500427731303001803003730037282650328745101002001000020020000300373003711102011009910010010000100001030710116112963417100001003003830038300383003830038
1020430037225000425295482510100100100001001000050042773130300180300373003728265032874510100200100002002000030037300371110201100991001001000010000000071021611296340100001003003830038300383003830038
1020430037225000890295482510100100100001001000050042773130300180300373003728265732874510100200100002002000030037300371110201100991001001000010000000071011611296340100001003003830038300383003830038
102043003722500061295482510100100100001001000050042773130300180300373003728265032874510100200100002002000030037300371110201100991001001000010000200071011611296340100001003003830038300383003830038
1020430037225000409295482510100100100001001000050042773130300180300373003728265032874510100200100002002000030037300371110201100991001001000010000000071011611296340100001003003830038300383003830038
1020430037225000386295482510100100100001001000050042773130300180300373003728265032874510100200100002002000030037300371110201100991001001000010000000071011611296340100001003003830038300383003830038
1020430037225000399295482510100100100001001000050042773130300180300373003728265032874510100200100002002000030037300371110201100991001001000010000000071011611296340100001003003830038300383003830038
1020430037225000386295482510100100100001001000050042773130300180300373003728265032874510100200100002002000030037300371110201100991001001000010000000071011611296340100001003003830038300383003830038

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)simd prf full (72)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)st unit uop (a7)l1d cache writeback (a8)acc2cfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? simd retires (ee)? int retires (ef)f5f6f7f8fd
100243003722500090102229548251001010100001010000504277313130018300373003728287032876710010201000020200003003730037111002110910101000010000006402162229630010000103003830038300383003830038
10024300372250000012829530251001010100001010000504277313130018300373003728287032878310010201000020200003003730037111002110910101000010000006402162229630010000103003830038300383003830038
10024300372240000042629548251001010100001010000504277313130018300373003728287032876710010201000020200003003730037111002110910101000010000006402162229630010000103003830038300383003830038
10024300372250000031329548251001010100001010000504277313130018300373003728287032876710010201000020200003003730037111002110910101000010000006402162229630010000103003830038300383003830038
10024300372320000046229548251001010100001010000504277313130018300373003728287032876710010201000020200003003730037111002110910101000010000006402162229630010000103003830038300383003830038
10024300372250000036129548251001010100001010000504277313130018300373003728287032876710010201000020200003003730037111002110910101000010000006402162229630010000103003830038300383003830038
10024300372250000097729548251001010100001010000504277313130018300373003728287032876710010201000020200003003730037111002110910101000010000006402162229630010000103003830038300383003830038
10024300372250000052529548251001010100001010000504277313130018300373003728287032876710010201000020200003003730037111002110910101000010000006402162229630010000103003830038300383003830038
10024300372240000023129548251001010100001010000504277313130018300373003728287032876710010201000020200003003730037111002110910101000010000006402162229630010000103003830038300383003830038
10024300372250000095729548251001010100001010000504277313130018300373003728287032876710010201000020200003003730037111002110910101000010000006402162229630010000103003830038300383003830038

Test 4: throughput

Count: 8

Code:

  sqrdmulh v0.8h, v8.8h, v9.h[1]
  sqrdmulh v1.8h, v8.8h, v9.h[1]
  sqrdmulh v2.8h, v8.8h, v9.h[1]
  sqrdmulh v3.8h, v8.8h, v9.h[1]
  sqrdmulh v4.8h, v8.8h, v9.h[1]
  sqrdmulh v5.8h, v8.8h, v9.h[1]
  sqrdmulh v6.8h, v8.8h, v9.h[1]
  sqrdmulh v7.8h, v8.8h, v9.h[1]
  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)1e1f3a3f51schedule 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)simd prf full (72)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)accfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)? int retires (ef)f5f6f7f8fd
802042004815000001272580100100800001008000050064000012002020039200399973039997801002008000020016000020039200391180201100991001008000010000051104162320036800001002004020040200402004020040
80204200391500000412580100100800001008000050064000002002020039200399973039997801002008000020016000020039200391180201100991001008000010000051102162320036800001002004020040200402004020040
80204200391500000412580100100800001008000050064000002002020039200399973039997801002008000020016000020039200391180201100991001008000010000051102163320036800001002004020040200402004020040
802042003915000003262580100100800001008000050064000012002020039200399973039997801002008000020016000020039200391180201100991001008000010000051102162320036800001002004020040200402004020040
80204200391500000412580100100800001008000050064000012002020039200399973039997801002008000020016000020039200391180201100991001008000010000051103163220036800001002004020040200402004020040
80204200391500000622580100100800001008000050064000012002020039200399973039997801002008000020016000020039200391180201100991001008000010000051102162320036800001002004020040200402004020040
80204200391500000412580100100800001008000050064000002002020039200399973039997801002008000020016000020039200391180201100991001008000010000051103163320036800001002004020040200402004020040
802042003915500001252580100100800001008000050064000012002020039200399973039997801002008000020016000020039200391180201100991001008000010000051101163220036800001002004020040200402004020040
80204200391500000412580100100800001008000050064000012002020039200399973039997801002008000020016000020039200391180201100991001008000010000051103162320036800001002004020040200402004020040
80204200391500600622580100100800001008000050064000012002020039200399973039997801002008000020016000020039200391180201100991001008000010000051103163320036800001002004020040200402004020040

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)18191e1f3a3f51schedule 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)a9acc2cfd0d5map dispatch bubble (d6)ddfetch restart (de)dfe0? int output thing (e9)? simd retires (ee)? int retires (ef)f5f6f7f8fd
80024200481550000009662580012128000012800006064000002002020039200399996310019800122080000201600002003920039118002110910108000010000005020011613020036080000102004020040200402004020040
80024200391500000009692580010108000012800005064000002002020039200399996310019800102080000201600002003920039118002110910108000010000005020011611020036080000102004020040200402004020244
80024200391500000017322580010108000010800005064000002002020039200399996310019800102080000201600002003920039118002110910108000010000005022011611020036080000102004020040200402004020040
800242003915000000012132580010108000010800005064000002002020039200399996310019800102080000201600002003920039118002110910108000010000005020011611020036080000102004020040200402004020040
8002420039150010000402580012128000010800005064000002002020039200399996310019800122080000201600002003920039118002110910108000010000005020011611020036080000102004020040200402004020040
8002420039150000000612580010108000010800005064000002002020039200399996310019800102080000201600002003920039118002110910108000010000005020011611220036080000102004020040200402004020040
80024200391500000001742580010108000010800005064000002002020039200399996310019800102080000201600002003920039118002110910108000010000005020011611020036080000102004020040200402004020040
800242003915000000012232580010108000010800005064000002002020039200399996310019800102080000201600002003920039118002110910108000010000005020011621220036080000102004020040200402004020040
800242003915000000011112580010108000010800005064000002002020039200399996310019800102080000201600002003920039118002110910108000010000005022011611020036080000102004020040200402004020040
800242003915000000011732580010108000010800005064000012005820039200399996310019800102080000201600002003920039118002110910108000010000005020011611020036080000102004020040200402004020040