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, 4S)

Test 1: uops

Code:

  sqrdmulh v0.4s, v0.4s, v1.s[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)ld unit uop (a6)accfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)f5f6f7f8fd
100430372301506125482510001000100039831313018303730372415328951000100020003037303711100110000073116112630100030383038303830383038
10043037230006125482510001000100039831303018303730372415328951000100020003037303711100110000073116112630100030383038303830383038
10043037230006125482510001000100039831303018303730372415328951000100020003037303711100110000073116112630100030383038303830383038
100430372301506125482510001000100039831303018303730372415328951000100020003037303711100110000073116112627100030383038303830383038
10043037230006125482510001000100039831303018303730372415328951000100020003037303711100110000073116112630100030383038303830383038
10043037230006125482510001000100039831303018303730372415328951000100020003037303711100110000073116112630100030383038303830383038
10043037230006125482510001000100039831303018303730372415328951000100020003037303711100110000073116112630100030383038303830383038
100430372304506125482510001000100039831303018303730372415328951000100020003037303711100110000073116112630100030383038303830383038
10043037230006125482510001000100039831303018303730372415328951000100020003037303711100110000073116112630100030383038303830383038
100430372300010325482510001000100039831313018303730372415328951000100020003037303711100110000073116112630100030383038303830383038

Test 2: Latency 1->2

Code:

  sqrdmulh v0.4s, v0.4s, v1.s[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)091e3f4e51schedule 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
102043003722500061295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000007101161129634100001003003830038300383003830038
102043003722400061295482510100100100001001000050042773131300183003730037282653287451010020010000200200003003730037111020110099100100100001000007101161129634100001003003830038300383003830038
102043003722500061295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000007101161129634100001003003830038300383003830038
102043003722500061295482510100100100001001000050042773131300183003730037282653287451010020010000200200003003730037111020110099100100100001000007101161129634100001003003830038300383003830038
102043003722501061295482510100100100001001000050042773131300183003730037282659287451010020010000200200003003730037111020110099100100100001000007101161129634100001003003830038300383003830038
1020430037225000251295482510100100100001001000050042773131300183003730037282653287451010020010000200200003003730037111020110099100100100001000007101161129634100001003003830038300383003830038
102043003722500061295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000007101161129634100001003003830038300383003830038
102043003722500061295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000007101161129634100001003003830038300383003830038
102043003722400061295482510100100100001001000050042773131300183003730037282653287451010020010000200200003003730037111020110099100100100001000007101161129634100001003003830038300383003830038
102043003722501061295482510100100100001001000050042773131300183008530037282653287451010020010000200200003003730037111020110099100100100001000007101161129634100001003003830038300383003830038

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)st unit uop (a7)l1d cache writeback (a8)acc2cdcfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? simd retires (ee)? int retires (ef)f5f6f7f8fd
100243003722500000061295482510010101000010100005042773133001830037300372828732876710010201000020200003003730037111002110910101000010000000006402162229630010000103003830038300383003830038
100243003722500000061295482510010101000010100005042773133001830037300372828732876710010201000020200003003730037111002110910101000010000000006402162229630010000103003830038300383003830038
100243003722500000061295482510010101000010100005042773133001830037300372828732876710010201000020200003003730037111002110910101000010000000006402162229630010000103003830038300383003830038
100243003722500000061295482510010101000010100005042773133001830037300372828732876710010201000020200003003730037111002110910101000010000000006402162229630010000103003830038300383003830038
100243003722500000061295482510010101000010100005042773133001830037300372828732876710010201000020200003003730037111002110910101000010000000006402162229630010000103003830038300383003830038
10024300372250000003853295482510010101000010100005042773133001830037300372828732876710010201000020200003003730037111002110910101000010000000006402162229630010000103003830038300383003830038
1002530037225000018061295482510010101000010100005042777993001830037300372828732876710010201000020200003003730037111002110910101000010000000006402162229630010000103003830038300383003830038
100243003722500000061295482510010101000010100005042773133001830037300372828732876710010201000020200003003730037111002110910101000010000003006402162229630010000103003830038300383003830038
100243003722500000061295482510010101000010100005042773133001830037300372828732876710010201000020200003003730037111002110910101000010000000006402162229630010000103003830038300383003830038
1002430037225000018061295482510010101000010100005042773133001830037300372828732876710010201000020200003003730037111002110910101000010000000006402162229630010000103003830038300383003830038

Test 3: Latency 1->3

Code:

  sqrdmulh v0.4s, v1.4s, v0.s[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)l2 tlb miss data (0b)191e1f3f4e51schedule 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 cache writeback (a8)acbranch 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
10204300372250000061295482510100100100001001000050042773133001830037300372827262874010100200100082002001630037300371110201100991001001000010000311171731600296460100001003003830038300383003830038
10204300372250000061295392510100100100001001000050042773133001830037300372827262874510100200100002002000030037300371110201100991001001000010000300071011611296340100001003003830038300383003830038
10204300372250000061295482510100100100001001000050042773133001830037300372826532874510100200100002002000030037300371110201100991001001000010000000071011611296340100001003003830038300383003830038
1020430037225000006129548251010010010000100100005004277313300183003730037282653287451010020010000200200003003730037111020110099100100100001000017400071011611296340100001003003830038300383003830038
10204300372250000061295482510100100100001001000050042773133001830037300372826532874510100200100002002000030037300371110201100991001001000010000600071011611296340100001003003830038300383003830038
102043003722400090612954825101001001000010010000500427731330018300373003728265328745101002001000020020000300373003711102011009910010010000100001200071011611296340100001003003830038300383003830038
1020430037226000006129548251010010410000100100005004277313300183003730037282653287451010020010000200200003003730037111020110099100100100001000012300071011611296340100001003003830038300383003830038
10204300372250000061295482510100100100001001000050042773133001830037300372826532874510100200100002002000030037300371110201100991001001000010000600071011611296340100001003003830038300383003830038
10204300372250000061295482510100100100001001000050042773133001830037300372826532874510100200100002002000030037300371110201100991001001000010000300071011611296340100001003003830038300383003830038
10204300372250000061295482510100100100001001000050042773133001830037300372826532874510100200100002002000030037300371110201100991001001000010000300071011611296340100001003003830038300383003830038

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)09l2 tlb miss instruction (0a)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)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 cache writeback (a8)acbranch mispred nonspec (cb)cfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? simd retires (ee)? int retires (ef)f5f6f7f8fd
10024300372240000000006129548251001010100001010000504277313300183003730037282873287671001020100002020000300373003711100211091010100001000306402162229630010000103003830038300383003830038
100243003722500000000061295482510010101000010100005042773133001830037300372828732876710010201000020200003003730037111002110910101000010008406402162229630010000103003830038300383003830038
1002430037225000000000612954825100101010000101000050427731330018300373003728287328767100102010000202000030037300371110021109101010000100018006402162229630010000103003830038300383003830038
10024300372250000000006129548251001010100001010000504277313300183003730037282873287671001020100002020000300373003711100211091010100001000006402162229630010000103003830038300383003830038
10024300372250000000006129548251001010100001010000504277313300183003730037282873287671001020100002020000300373003711100211091010100001000306402162229630010000103003830038300383003830038
10024300372240000000006129548251001010100001010000504277313300183003730037282873287671001020100002020000300373003711100211091010100001000606402162229630010000103003830038300383003830038
10024300372250000000006129548251001012100001010000504277313300183003730037282873287671001220100002020000300373003711100211091010100001000306402163229630010000103003830038300383003830038
10024300372250000000006129548251001010100001010000504277313300183003730037282873287671001020100002020000300373003711100211091010100001000906401162229630010000103003830038300383003830038
10024300372250000000006129548251001010100001010000504277313300183003730037282873287671001020100002020000300373003711100211091010100001000306402162229630010000103003830038300383003830038
10024300372240000000006129548251001010100001010000504277313300183003730037282873287671001020100002020000300373003711100211091010100001000306402162229630010000103003830038300383003830038

Test 4: throughput

Count: 8

Code:

  sqrdmulh v0.4s, v8.4s, v9.s[1]
  sqrdmulh v1.4s, v8.4s, v9.s[1]
  sqrdmulh v2.4s, v8.4s, v9.s[1]
  sqrdmulh v3.4s, v8.4s, v9.s[1]
  sqrdmulh v4.4s, v8.4s, v9.s[1]
  sqrdmulh v5.4s, v8.4s, v9.s[1]
  sqrdmulh v6.4s, v8.4s, v9.s[1]
  sqrdmulh v7.4s, v8.4s, v9.s[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)03mmu table walk data (08)l2 tlb miss data (0b)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)9fl1d tlb access (a0)l1d tlb miss (a1)ld 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
802042005815000000004125801001008000010080000500640000120020200392003999733999780100200800002001600002003920039118020110099100100800001000000000511021611200360800001002004020040200402004020040
802042003915000000002312580100100800001008000050064000002002020039200399973399978010020080000200160000200392003911802011009910010080000100000022570511011611200360800001002004020040200402004020040
8020420039150000000041258010010080000100800005006400000200202003920039997339997801002008000020016000020039200391180201100991001008000010000000150511011611200360800001002004020040200402004020040
80204200391501000000412580100100800001008000050064000002002020039200399973399978010020080000200160000200392003911802011009910010080000100000022660511011611200360800001002004020040200402004020040
802042003915000000004125801001008000010080000500640000020020200392003999733999780100200800002001600002003920039118020110099100100800001000000000511011611200360800001002004020040200402004020040
802042003915000000004125801001008000010080000500640000020020200392003999733999780100200800002001600002003920039118020110099100100800001000000000511011611200360800001002004020040200402004020040
802042003915000000004125801001008000010080000500640000020020200392003999733999780100200800002001600002003920039118020110099100100800001000000000511011611200360800001002004020040200402004020040
802042003914900000004125801001008000010080000500640000020020200392003999733999780100200800002001600002003920039118020110099100100800001000000000511011611200360800001002004020040200402004020040
802042003915000000004125801001008000010080000500640000020020200392003999733999780100200800002001600002003920039118020110099100100800001000000000511011611200360800001002004020040200402004020040
802042003915000000004125801001008000010080000500640000020020200392003999733999780100200800002001600002003920039118020110099100100800001000000030511011611200360800001002004020040200402004020040

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)l2 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)accfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)? int retires (ef)f5f6f7f8fd
80024200481500004025800101080000108000050640000020020020039200399996310019800102080000201600002003920039118002110910108000010005020416232003680000102004020040200402004020040
80024200391500004025800101080000108000050640000020020020039200399996310019800102080000201600002003920039118002110910108000010005020416442003680000102004020040200402004020040
8002420039150001240258001010800001080000506400000200200200902012910005310019800102080000201600002003920039118002110910108000010005054416432003680000102004020040200402004020040
80024200391500004025800101080000108000050640000020020020039200399996310019800102080000201600002003920039118002110910108000010005020516552003680000102004020040200402004020040
80024200391500004025800101080000108000050640000020020020039200399996310019800102080000201600002003920039118002110910108000010005020316452003680000102004020040200402004020040
80024200391500004025800101080000108000050640000020024020039200399996310019800102080000201600002003920039118002110910108000010005020316442003680000102004020040200402004020040
80024200391500004025800101080000108000050640000020020020039200399996310019800102080000201600002003920039118002110910108000010035020416332003680000102004020040200402004020040
80024200391500004025800101080000108000050640000020020020039200399996310019800102080000201600002003920039118002110910108000010005020316352003680000102004020040200402004020040
80024200391500004025800101080000108000050640000020020020039200399996310019800102080000201600002003920039118002110910108000010005020416342003680000102004020040200402004020040
80024200391500004025800101080000108000050640000020020020039200399996310019800102080000201600002003920039118002110910108000010005020416442003680000102004020040200402004020040