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

FCADD (vector, 8H)

Test 1: uops

Code:

  fcadd v0.8h, v0.8h, v1.8h, #90
  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)696d6emap 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
10043037230612548251000100010003983133018303730372415328951000100020003037303711100110000073216222630100030383038303830383038
10043037220612548251000100010003983133018303730372415328951000100020003037303711100110000073216222630100030383038303830383038
10043037230612548251000100010003983133018303730372415328951000100020003037303711100110000073216222630100030383038303830383038
100430372212612548251000100010003983133018303730372415328951000100020003037303711100110004073216222630100030383038303830383038
10043037230612548251000100010003983133022303730372415328951000100020003037303711100110000073216222630100030383038303830383038
100430372306125482510001000100039831330183037303724153289510001000200030373037111001100003994216222630100030383038303830383038
10043037230612548251000100010003983133018303730372415328951000100020003037303711100110000073216222630100030383038303830383038
10043037230612548251000100010003983133018303730372415328951000100020003037303711100110000073216222630100030383038303830383038
10043037230612548251000100010003983133018303730372415328951000100020003037303711100110000073216222630100030383038303830383038
10043037230612548251000100010003983133018303730372415328951000100020003037303711100110000073216222630100030383038303830383038

Test 2: Latency 1->2

Code:

  fcadd v0.8h, v0.8h, v1.8h, #90
  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)1e3f4e51schedule 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
1020430037225006129548251010010010000100100005004277313130018300373003728268328745101002001000020020000300373003711102011009910010010000100007101161129634100001003003830038300383003830038
1020430037225006129548251010010010000100100005004277313130018300373003728265328745101002001000020020000300373003711102011009910010010000100007101161129634100001003003830038300383003830038
1020430037225008229548251010010010000126100005004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100007101161129634100001003003830038300383003830038
1020430037225006129548251010010010000100100005004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100007101161129634100001003003830038300383003830038
1020430037225006129548251010010010000100100005004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100007101161129634100001003003830038300383003830038
10204300372250072629548251010010010000100100005004277313130018300373003728265328745101002001000020020000300373003711102011009910010010000100107101161129634100001003003830038300383003830038
10204300372250063129548251010010010000100100005004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100007101161129634100001003003830038300383003830038
1020430037225006129548251010010010000100100005004277313130018300373003728265328745101002001000020020000300373003711102011009910010010000100007101161129634100001003003830038300383003830038
1020430037225006129548251010010010000100100005004277313030018300373003728265328745101002001000020020000300373003711102011009910010010000100007101161129634100001003003830038300383003830038
1020430037225008429548251010010010000100100005004277313130018300373003728265328745101002001000020020000300373003711102011009910010010000100007101161129634100001003003830038300383003830038

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)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)l1d cache writeback (a8)a9accfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)? int retires (ef)f5f6f7f8fd
100243003722506129548251001010100001010000504277313300183003730037282873287671001020100002020000300373003711100211091010100001000000640216222963010000103003830038300383003830038
1002430037225072329548251001010100001010000504277313300183003730037282873287671001020100002020000300373003711100211091010100001000109640216222963010000103003830038300383003830038
10024300372250146629548251001010100001010149504277313300543003730037282873287671001022101612020000300373003721100211091010100001000003640216222963010000103003830038300383003830038
1002430132225072629548251001010100001010000504277313300183003730037282873287671001020100002020000300373003711100211091010100001000000640216222963010000103003830038300383003830038
1002430037225053629548251001010100001010000504277313300183003730037282873287671001020100002020000300373003711100211091010100001000100640216222963010000103003830038300383003830038
100243003722508429548251001010100001010000504277313300183003730037282873287671001020100002020000300373003711100211091010100001000003640216222963010000103003830038300383003830038
100243003722506129548251001010100001010000504277313300183003730037282873287671001020100002020000300373003711100211091010100001000010640216222963010000103003830038300383003830038
10024300372251626129539251001910100001010000504277313300183003730037282873287671016120100002220000300373003721100211091010100001002000640216222963010000103003830038300383003830038
100243003722506129548251001010100001010000504277313300183003730037282873287671001020100002020000300373003711100211091010100001000003640216222963010000103003830038300383003830038
1002430037225126129548251001010100001010000504277313300183003730037282873287671001020100002020000300373003711100211091010100001000000640216222963010000103003830038300383003830038

Test 3: Latency 1->3

Code:

  fcadd v0.8h, v1.8h, v0.8h, #90
  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)0318191e1f3f4e51schedule 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)ld unit uop (a6)l1d cache writeback (a8)acc2cdcfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? simd retires (ee)? int retires (ef)f5f6f7f8fd
10204300372250000612954825101001001000010010000500427731313001830037300372826532874510100200100002002000030037300371110201100991001001000010000000071011611296340100001003003830038300383003830038
10204300372250000612954825101001001001610010000500427731313001830037300372826532874510100200100002002000030037300371110201100991001001000010000000071011611296340100001003003830038300383003830038
102043003722500006312954825101001001000010010000500427731303001830037300372826532874510100200100002002000030037300371110201100991001001000010000000078211611296340100001003003830038300383003830038
1020430037225000072629548251010010010000100100005004277313130018300853003728265328745101002001000020020000300373003711102011009910010010000100000000710116112963425100001003003830038300383003830038
10204300372250000612954825101001001000010010000500427731303001830037300372826532874510100200100002002000030179300371110201100991001001000010000000071011611296340100001003003830038300383003830038
10204300372250000612954825101001001000010010000500427731313001830037300372826532874510100200100002002000030037300371110201100991001001000010000000071011611296340100001003003830038300383003830038
10204300372250000612954825101001001000010010000500427731303001830037300372826532874510100200100002002000030037300371110201100991001001000010000000071011611296340100001003003830038300383003830038
10204300372250000612954825101001001000010010000500427731313001830037300372826532874510100200100002002000030037300371110201100991001001000010000000071011611296340100001003003830038300383003830038
10204300372250000612954825101001001000011010000500427731303001830037300372826532874510100200100002002000030037300371110201100991001001000010000000071011611296340100001003003830038300383003830038
10204300372250000612954825101001001000010010000500427731313001830037300372826532874510100200100002002000030037300371110201100991001001000010000000071011611296340100001003003830038300383003830038

1000 unrolls and 10 iterations

Result (median cycles for code): 3.0037

retire uop (01)cycle (02)03l2 tlb miss instruction (0a)1e1f3f4e51schedule 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)accfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)? int retires (ef)f5f6f7f8fd
1002430037225000612954825100101010000101000050427731313001830037300372828732876710010201000020200003003730037111002110910101000010000640516222963010000103003830038300863008630038
1002430037225000612954825100101010000101000050427731313001830037300372828732876710010201000020200003003730037111002110910101000010000640216222963010000103003830038300383003830038
1002430037224000612954825100101010000101000050427731313001830037300372828732876710010201000020200003003730037111002110910101000010020640216222963010000103003830038300383003830038
1002430037224000612954825100101010000101000050427731313001830037300372828732876710010201000020200003003730037111002110910101000010000640216222963010000103003830038300383003830038
10024300372250360612954825100101010000101000050427731313001830226300372828732876710010201000020200003003730037111002110910101000010000640216222963010000103003830038300383003830038
1002430037225000612954825100101010000101000050427731313001830037300372828732876710010201000020200003003730037111002110910101000010000640216222966810000103003830038300383003830038
1002430037224100612954825100101010000101000050427731313001830037300372828732876710010201000020200003003730037111002110910101000010000640216222963010000103003830038300383003830038
1002430037225000612954825100101010000101000050427731313001830037300372828732876710010201000020200003003730037111002110910101000010000640216222963010000103003830038300383003830038
1002430037225000612954825100101010000101000050427731313001830037300372828732876710010201000020200003003730037111002110910101000010200640216222963010000103003830038300383003830038
1002430037225000612954825100101010000101000050427731313001830037300372828732876710010201000020200003003730037111002110910101000010000640216222963010000103003830038300383003830038

Test 4: throughput

Count: 8

Code:

  fcadd v0.8h, v8.8h, v9.8h, #90
  fcadd v1.8h, v8.8h, v9.8h, #90
  fcadd v2.8h, v8.8h, v9.8h, #90
  fcadd v3.8h, v8.8h, v9.8h, #90
  fcadd v4.8h, v8.8h, v9.8h, #90
  fcadd v5.8h, v8.8h, v9.8h, #90
  fcadd v6.8h, v8.8h, v9.8h, #90
  fcadd v7.8h, v8.8h, v9.8h, #90
  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)031e1f3f5051schedule 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)9fl1d cache writeback (a8)a9cfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? simd retires (ee)? int retires (ef)f5f6f7f8fd
8020420069150907060258010010080000100800005006400002002002003920039997339997801002008000020016000020039200391180201100991001008000010000511021611200360800001002004020040200402004020040
8020420039150004120023258010010080000100800005006400002002002003920039997339997801002008000020016000020039200391180201100991001008000010000511011611200360800001002004020040200402004020040
802042003915000410258010010080000100800005006400002002002003920039997339997801002008000020016000020039200391180201100991001008000010000511011611200360800001002004020040200402004020040
802042003915060410258010010080000100800005006400002002002009020039997339997801002008000020016000020039200391180201100991001008000010000511011611200360800001002004020040200402004020040
8020420088150270410258010010080000100800005006400002002002003920039997339997801002008000020016000020039200391180201100991001008000010000511011611200360800001002004020040200402004020040
8020420039150001360258010010080000100800005006400002002002003920039997339997801002008000020016000020039200391180201100991001008000010000511011611200360800001002004020040200402004020040
802042003915090410258010010080000100800005006400002002002003920039997339997801002008000020016000020039200391180201100991001008000010000511011611200360800001002004020040200402004020040
802042003915090410258010010080000100800005006400002002002003920039997339997801002008000020016000020039200391180201100991001008000010000511011611200360800001002004020040200402004020040
80204200391504440410258010010080000100800005006400002002002003920039997339997801002008000020016000020039200391180201100991001008000010002511011611200360800001002004020040200402004020040
8020420039150300410258010010080000100800005006400002002002003920039997339997801002008000020016000020039200391180201100991001008000010000511011611200360800001002004020040200402004020040

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)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)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)st unit uop (a7)l1d cache writeback (a8)a9acc2cdcfd0d5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)ebec? simd retires (ee)? int retires (ef)f5f6f7f8fd
80024200481500000004025800101080000108000050640000012002020039200399996310019800102080000201600002003920039118002110910108000010000000050200316552003600080000102004020040200402004020040
80024200391500000004025800101080000108000050640000002002020039200399996310019800102080000201600002003920039118002110910108000010000000050200416732003600080000102004020040200402004020040
80024200391500000004025800101080000108000050640000002002020039200399996310019800102080000201600002003920039118002110910108000010000000050200416452003600080000102004020040200402004020040
80024200391501000004025800101080000108000050640000012002020039200399996310019800102080000201601982006220099218002110910108000010000000050200416442003600080000102004020040200402004020040
8002420039150000000402580010108009912800005064000000200202003920039999631001980010208000020160000200392003911800211091010800001000001500050200316342003600080000102004020040200402004020040
80024200391510000004025800101080000108000050640000012002020039200399996310019800102080000201600002003920039118002110910108000010000000050200516552003600080000102004020040200402004020040
80024200391500000004025800101080000108000050640000012002020039200399996310019800102080000201600002003920039118002110910108000010000000050200516542003600080000102004020040200402004020040
80024200391490000004025800101080000108000050640000012002020039200399996310019800102080000201600002003920039118002110910108000010000000050200416332003600080000102004020040200402004020040
80024200391500000004025800101080000108000050640000012002020039200399996310019800102080000201600002003920039118002110910108000010001000050200316332011700080000102004020040200402004020040
80024200391500000004025800101080000108010750640000002002020039200899996310019800102080000201600002003920039118002110910108000010000000050200516552003600080000102004020040200402004020040