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

FCVTZU (vector, fixed-point, 2D)

Test 1: uops

Code:

  fcvtzu v0.2d, v0.2d, #3
  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)0318191e3f4e51schedule 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
10043037240006125472510001000100039816003018303730372414328951000100010003037303711100110001073116112629100030383038303830383038
10043037230006125472510001000100039816003018303730372414328951000100010003037303711100110000073116112629100030383038303830383038
100430372300010325472510001000100039816013018303730372414328951000100010003037303711100110000073116112629100030383038303830383038
10043037230006125472510001000100039816013018303730372414328951000100010003037303711100110000073116112629100030383038303830383038
10043037231006125472510001000100039816013018303730372414328951000100010003037303711100110000073116112629100030383038303830383038
10043037240006125472510001000100039816013018303730372414328951000100010003084303711100110000073116112629100030383038303830383038
100430372300010325472510001000100039816013018303730372414328951000100010003037303711100110000073116112629100030383038303830383038
10043037230006125472510001000100039816013018303730842414328951000100010003037303711100110000073116112629100030383038303830383038
10043037241006125472510001000100039816013018303730372414328951000100010003037303711100110000073116112629100030383038303830383038
10043037230006125472510001000100039816013018303730372414328951000100010003037303711100110000073116112629100030383038303830383038

Test 2: Latency 1->2

Code:

  fcvtzu v0.2d, v0.2d, #3
  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)0318191e3a3f4e51schedule 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)a9accfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? simd retires (ee)? int retires (ef)f5f6f7f8fd
10204300372330000662954725101001001000010010000500427716013001830037300372826432874510100200100002001000030037300371110201100991001001000010000071011611296330100001003003830038300383003830038
1020430037233000061295472510100100100001001000050042771601300183003730037282643287451010020010000200100003003730037331102011009910010010000100000710117112963325100001003003830086300383003830038
102043003723200006129547251010010010000100100005004277160130018300373003728264328745101002001000020010000300373003711102011009910010010000100000710116112963325100001003003830038300383003830038
10204300372330000612954725101001001000010010000626427716013001830037300372826432874510100200100002001000030037300371110201100991001001000010000071011611296330100001003003830038300383003830038
10204300372330000612954725101001001000010010000500427716013001830037300372826432874510100200100002001000030037300371110201100991001001000010000071011611296330100001003003830038300383003830038
10204300372330001612954725101001001000010010000500427716013001830037300372826432874510100200100002001000030037300371110201100991001001000010012071001611296330100001003003830038300383003830038
10204300372330000612954725101251001000010010000500427716003001830037300372826432874510100200100002001000030037300371110201100991001001000010000075611611296330100001003003830038300383003830085
10204300372330000612954725101251001000712510000500427716003001830037300372826432874510100200100002001000030037300371110201100991001001000010000071411611296330100001003003830038300383003830038
10204300372330000612954725101001001000010010000626427716013001830037300372826432874510100200100002001000030037300371110201100991001001000010000071411611296330100001003003830038300383003830038
10204300372330000612954725101001001000010010000500427716003001830037300372826432874510100200100002001000030037300371110201100991001001000010000071411611296330100001003003830038300383003830038

1000 unrolls and 10 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)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)acc2cfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? simd retires (ee)? int retires (ef)f5f6f7f8fd
100243003722500031229547251001010100001010000504277160130018300373003728286328767100102010000201000030037300371110021109101010000100006405165429629010000103003830038300383003830038
10024300372250006129547251001010100001010000504277160130018300373003728286328767100102010000201000030037300371110021109101010000100006404165529629010000103003830038300383003830038
10024300372250006129547251001010100001010000504277160130018300373003728286328767100102010000201000030037300371110021109101010000100006405165529629010000103003830038300383003830038
100243003722500019129547251001010100001010000504277160130018300373003728286328767100102010000201000030037300371110021109101010000100006404165429629010000103003830038300383003830038
10024300372250006129547251001010100001010000504277160130018300373003728286328767100102010000201000030037300371110021109101010000100006404165429629010000103003830038300383003830038
10024300372250006129547251001010100001010000504277160030018300373003728286328767100102010000201000030037300371110021109101010000100006405164529629010000103003830038300383003830038
100243003722500016829547251001010100001010000504277160130018300373003728286328767100102010000201000030037300371110021109101010000100006405164529629010000103003830038300383003830038
10024300372250006129547251001010100001010000504277160130018300373003728286328767100102010000201000030037300371110021109101010000100006405165429629010000103003830038300383003830038
10024300372250006129547251001010100001010000504277160130018300373003728286328767100102010000201000030037300371110021109101010000100006404164529629010000103003830038300383003830038
100243003722500018929547251001010100001010000504277160030018300373003728286328767100102010000201000030037300371110021109101010000100006405165429629010000103003830038300383003830038

Test 3: throughput

Count: 8

Code:

  fcvtzu v0.2d, v8.2d, #3
  fcvtzu v1.2d, v8.2d, #3
  fcvtzu v2.2d, v8.2d, #3
  fcvtzu v3.2d, v8.2d, #3
  fcvtzu v4.2d, v8.2d, #3
  fcvtzu v5.2d, v8.2d, #3
  fcvtzu v6.2d, v8.2d, #3
  fcvtzu v7.2d, v8.2d, #3
  movi v8.16b, 9

(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)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)a9acc2branch cond mispred nonspec (c5)branch mispred nonspec (cb)cdcfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)? int retires (ef)f5f6f7f8fd
8020420060156000090030258010810080008100800205006401322002020039200399977699908012020080032200800322003920039118020110099100100800001000000006011151180160020036800001002004020040200402004020040
80204200391550000360030258010810080008100800205006401322002020039200399977699908012020080032200800322003920039118020110099100100800001000000000011151180160020036800001002004020040200402004020040
8020420039155001000030258010810080008100800205006401322002020039200399977699908012020080032200800322003920039118020110099100100800001000000000011151180160020036800001002004020040200402004020040
802042003915500002700345638010810080008100800205006401322002020039200399977699908012020080032200800322003920039118020110099100100800001000000000011151180160020036800001002004020040202452004020040
80204200391560100360030258010810080008100800205006401322002020039200399977699908012020080032200800322003920039118020110099100100800001000000000011151180160020036800001002004020040200402004020040
80204200391551000000302580108100800081008002050064013220020200392003999776999080120200800322008003220039200391180201100991001008000010000001015011151180160020036800001002004020040200402004020040
80204200391550000210030258010810080008100800205006401322002020039200399977699908012020080032200800322003920039118020110099100100800001000000000011151180160020036800001002004020040200402004020040
80204200391560000210030258010810080008100800205006401322002020039200399977699908012020080032200800322003920039118020110099100100800001000000000011151180160020036800001002004020040200402004020040
8020420039155000000030258010810080008100800205006401322002020039200399977699908012020080032200800322003920039118020110099100100800001000000000011151180160020036800001002004020040200402004020040
8020420039156000060030258010810080008100800205006401322002020039200399977699908012020080032200800322003920039118020110099100100800001000000000011151180160020036800001002004020040200402004020040

1000 unrolls and 10 iterations

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

retire uop (01)cycle (02)03191e1f3f51schedule 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 cache writeback (a8)accfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)? int retires (ef)f5f6f7f8fd
8002520039155000402580010108000010800005064000000200202003920039999631001980010208000020800002003920039118002110910108000010035020316342003680000102004020040200402004020040
80024200391550002722580010108000010800005064000000200202003920039999631001980010208000020800002003920039118002110910108000010005020316452003680000102004020040200402004020040
8002420039155000402580010108000010800005064000000200202003920039999631001980010208000020800002003920039118002110910108000010005020316442003680000102004020040200402004020040
8002420039155000402580010108000010800005064000000200202003920039999631001980010208000020800002003920039118002110910108000010005020316352003680000102004020040200402004020040
8002420039156000402580010108000010800005064000000200202003920039999631001980010208000020800002003920039118002110910108000010005020516342003680000102004020040200402004020040
8002420039155000402580010108000010800005064000000200202003920039999631001980010208000020800002003920039118002110910108000010005020516442003680000102004020040200402004020040
8002420039161000402580010108000010800005064000000200202003920039999631001980010208000020800002003920039118002110910108000010005020316342003680000102004020040200402004020040
8002420039155000402580010108000010800005064000000200202003920039999631001980010208000020800002003920039118002110910108000010005059416542003680000102004020040200402004020040
8002420039155000402580010108000010800005064000000200202003920039999631001980010208000020800002003920039118002110910108000010035020416542003680000102004020040200402004020040
80024200391550002302580010108000010800005064000000200202003920039999631001980010208000020800002003920039118002110910108000010005020416442003680000102004020040200402004020040