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

UQSUB (scalar, S)

Test 1: uops

Code:

  uqsub 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)l1d cache writeback (a8)accfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)f5f6f7f8fd
100430372208425482510001000100039831313018303730372415328951000100020003037303711100110000073116112630100030383038303830383038
100430372306125482510001000100039831313018303730372415328951000100020003037303711100110000073116112630100030383038303830383038
1004303723028925482510001000100039831313018303730372415328951000100020003037303711100110000073116112630100030383038303830383038
100430372306125482510001000100039831313018303730372415328951000100020003037303711100110000073116112630100030383038303830383038
100430372306125482510001000100039831313018303730372415328951000100020003037303711100110000073116112630100030383038303830383038
100430372206125482510001000100039831313018303730372415328951000100020003037303711100110000073116112630100030383038303830383038
100430372306125482510001000100039831313018303730372415328951000100020003037303711100110000073116112630100030383038303830383038
100430372206125482510001000100039831313018303730372415328951000100020003037303711100110000073116112630100030383038303830383038
100430372206125482510001000100039831313018303730372415328951000100020003037303711100110000073116112630100030383038303830383038
1004303723010525482510001000100039831313018303730372415328951000100020003037303711100110000073116112630100030383038303830383038

Test 2: Latency 1->2

Code:

  uqsub 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)0309181e3f4e51schedule 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
1020430037225004261295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000000071011611296340100001003003830038300383003830038
102043003722500061295482510100100100001001000050042773130300183003730037282653287451010020410000200200003003730037111020110099100100100001000000071011611296340100001003003830038300383003830038
1020430037225000126295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000000371011611296340100001003003830038300383003830038
102043003722500061295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000000071011611296340100001003003830038300383003830038
102043003722500061295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000000071011611296340100001003003830038300383003830038
102043003722500061295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000000071011611296340100001003003830038300383003830038
10204300372250215061295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000000071011611296340100001003003830038300383003830038
1020430037225000726295482510100100100001001000050042773131300183003730037282653287451010020010000200200003008430037111020110099100100100001002221671011611296340100001003003830038300383003830038
1020430037225000726295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000000071011611296340100001003003830038300383003830038
102043003722500061295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000000071011611296340100001003003830038300383003830038

1000 unrolls and 10 iterations

Result (median cycles for code): 3.0037

retire uop (01)cycle (02)03l2 tlb miss data (0b)18191e3f4e51schedule 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
10024300372250000612954825100101010000101000050427731330018300373003728287328767100102010000202000030037300371110021109101010000100000006406162229630010000103003830038300383003830038
10024300372250000612954825100101010000101000050427731330018300373003728287328767100102010000202000030037300371110021109101010000100000006402162229630010000103003830038300383003830038
10024300372240000612954825100101010000101000050427731330018300373003728287328767100102010000202000030037300371110021109101010000100000006402162229630010000103003830038300383003830038
10024300372250000612954825100101010000101000050427731330018300373003728287328767100102010000202000030037300371110021109101010000100000006402162229630010000103003830038300383003830038
10024300372250000612954825100101010000101000050427731330018300373003728287328767100102010000202000030037300371110021109101010000100000006402162229630010000103003830038300383003830038
10024300372250000612954825100101010000101000050427731330018300373003728287328767100102010000202000030037300371110021109101010000100000006402162229630010000103003830038300383003830038
10024300372250000612954825100101010000101000050427731330018300373003728287328767100102010000202000030037300371110021109101010000100000006402162229630010000103003830038300383003830038
10024300372250000612954825100101010000101000050427731330018300373003728287328767100102010000202000030037300371110021109101010000100000006402162229630010000103003830038300383003830038
10024300372250000612954825100101010000101000050427731330018300373003728287328767100102010000202000030037300371110021109101010000100000006402162229630010000103008130038300383003830038
10024300372250000612954825100101010000101000050427731330018300373003728287328767100102010000202000030037300371110021109101010000100000006402162229630010000103003830038300383003830038

Test 3: Latency 1->3

Code:

  uqsub 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 instruction (07)l2 tlb miss instruction (0a)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 cache writeback (a8)accfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)? int retires (ef)f5f6f7f8fd
102043003722500006012429548251010010010000100100005004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100007103162229634100001003003830038300383003830038
10204300372250000906129548251010010010000100100005004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100107102162229634100001003003830038300853008630134
102043003722500011718810329548251010011110000104102255004281384030018300373003728265328745101002001000020020000300373003711102011009910010010000100037102162229634100001003003830038300383003830038
1020430037225000000726295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001008067102162229634100001003003830038300383003830038
1020430037225000012061295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001002337102162229634100001003003830038300383003830038
1020430037225000000612954825101001001000010010000500427731303001830037300372826572876310100200100002002000030037300371110201100991001001000010001747102162229634100001003003830038300383003830038
102043003722400000016629548251010010010000100100005004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100067102162229634100001003003830038300383003830038
102043003722500000061295482510100100100001001000050042773130300183003730037282653287451010020010000200200003003730037111020110099100100100001000127102162229634100001003003830038300383003830038
10204300372250000006129548251010010010000100100005004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100037102162229634100001003003830038300383003830038
1020430037225100000612954825101001001000010010000500427731303001830037300372826532874510100200100002002000030037300371110201100991001001000010001087102162229634100001003003830038300383003830038

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)181e3a3f4e51schedule 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)accfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)? int retires (ef)f5f6f7f8fd
1002430037224101002682954825100101010000101000050427731313001830037300372828732876710010201000020200003003730037111002110910101000010006445165102963010000103003830038300383003830038
10024300372251010026829548251001010100001010000504277313130018300373003728287328767100102010000202000030037300371110021109101010000100064411168112963010000103003830038300383003830038
100243003722510110268295482510010101000010100005042773130300183003730081282873287671001020100002020000300373003711100211091010100001000644101612122963010000103003830038300383003830038
10024300372251010026829548251001010100001010000504277313130018300373003728287328767100102010000202000030037300371110021109101010000100064451610122963010000103003830038300383003830038
100243003722410100268295482510010101000010100005042773130300183003730037282873287671001020100002020000300373003711100211091010100001000644101611102963010000103003830038300383003830038
100243003722510100268295482510010101000010100005042773130300183003730037282873287671001020100002020000300373003711100211091010100001000644101610102963010000103003830038300383003830038
10024300372241010026829548251001010100001010000504277313030018300373003728287328767100102010000202000030037300371110021109101010000100064411161062963010000103003830038300383003830038
10024300372251010026829548251001010100001010000504277313130018300373008428287328767100102010000202000030037300371110021109101010000100064451610102963010000103003830038300383003830038
100243003722410100268295482510010101000010100005042773131300183003730037282873287671001020100002020000300373003711100211091010100001000644101612122963010000103003830038300383003830038
100243003722510100268295482510010101000010100005042773131300183003730037282873287671001020100002020000300373003711100211091010100001000644111610102963010000103003830038300383003830038

Test 4: throughput

Count: 8

Code:

  uqsub s0, s8, s9
  uqsub s1, s8, s9
  uqsub s2, s8, s9
  uqsub s3, s8, s9
  uqsub s4, s8, s9
  uqsub s5, s8, s9
  uqsub s6, s8, s9
  uqsub 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)03mmu table walk data (08)09l2 tlb miss data (0b)18191e1f3f51schedule 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)ld unit uop (a6)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
802042003915000000181763025801081008000810080020500640132120020200392003999776999080120200800322001600642003920039118020110099100100800001000044060111511801600200360800001002004020040200402004020040
80204200391500000000412580100100800001008000050064000012002020039200399973399978010020080000200160000200392003911802011009910010080000100004301350000511011611200360800001002004020040200402004020040
802042003915000000001042580100100800001008000050064000002002020039200399973399978010020080000200160000200392003911802011009910010080000100000000000511011611200360800001002004020040200402004020040
80204200391500000000412580100100800001008000050064000012002020039200399973399978010020080000200160000200392003911802011009910010080000100001000000511011611200360800001002004020040200402004020040
802042003915000000004125801001008000010080000500640000020020200392003999733999780100200800002001600002003920039118020110099100100800001000000750000511011611200360800001002004020040200402004020040
80204200391500000000412580100100800001008000050064000002002020039200399973399978010020080000200160000200392003911802011009910010080000100000000000511011611200360800001002004020040200402004020040
80204200391500000000412580100100800001008000050064000002002020039200399973399978010020080000200160000200392003911802011009910010080000100000000000511011611200360800001002004020040200402004020040
80204200391500000000412580100100800001008000050064000012002020039200399973399978010020080000200160000200392003911802011009910010080000100000000000511011611200360800001002004020040200402004020040
802042003915000000009882580100100800001008000050064000012002020039200399973399978010020080105200160000200392003911802011009910010080000100000000000511011611200360800001002004020040200402004020040
802042003915000000008922580100100800001008000050064000012002020039200399973399978010020080000200160000200392003911802011009910010080000100000000000511011611200360800001002004020040200402004020040

1000 unrolls and 10 iterations

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

retire uop (01)cycle (02)0318191e1f3f51schedule 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)ld unit uop (a6)l1d cache writeback (a8)a9accfd0d5map dispatch bubble (d6)daddfetch restart (de)dfe0? int output thing (e9)? simd retires (ee)? int retires (ef)f5f6f7f8fd
80024200481500000402580010108000010800005064000001200202003920039999631001980010208000020160000200392003911800211091010800001000002750243216022320036080000102004020040200402004020040
8002420039150000040258001010800001080000506400000120020200392003999963100198001020800002016000020039200391180021109101080000100000350243316032320036080000102004020040200402004020040
8002420039150000040258001010800001080000506400000120020200392003999963100198001020800002016000020039200391180021109101080000100000350243216042320036080000102004020040200402004020040
8002420039150000040258001010800001080000506400000120020200392003999963100198001020800002016000020039200391180021109101080000100000350243416044320036080000102004020040200402004020040
8002420039150000040258001010800001080000506400001120020200392003999963100198001020800002016000020039200391180021109101080000100000050243316023320036080000102004020040200402004020040
8002420039150000040438001010800001080000506400001120020200392003999963100198001020800002016000020039200391180021109101080000100000050243216042320036080000102004020040200402004020091
8002420039150001217640258001010800001080000506400000120020200392003999963100198001020800002016000020039200391180021109101080000100000050243216022320078080000102004020040200402004020040
8002420039150000040258001010800001080000506400000120020200392003999963100198001020800002016000020039200391180021109101080000100000050243316032320036080000102004020040200402004020040
8002420039150000040258001010800001080000506400000120020200392003999963100198001020800002016000020039200391180021109101080000100000350243416022320036080000102004020040200402004020040
8002420039150000040258001010800001080000506400001120020200392003999963100198001020800002016000020039200391180021109101080000100000050243316022320036080000102004020040200402004020040