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

FCVTPU (vector, 2D)

Test 1: uops

Code:

  fcvtpu v0.2d, v0.2d
  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)a9accfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)f5f6f7f8fd
1004303724000103254725100010001000398160130183037303724143289510001000100030373037111001100000073216222629100030383038303830383038
1004303724024061254725100010001000398160030183037303724143289510001000100030373037111001100000073216222629100030383038303830383038
100430372410061254725100010001000398160030183037303724143289510001000100030373037111001100000073216222629100030383038303830383038
1004303723012061254725100010001000398160030183037303724143289510001000100030373037111001100000073216222629100030383038303830383038
100430372400061254725100010001000398160030183037303724143289510001000100030373037111001100000073216222629100030383038303830383038
100430372300061254725100010001000398160030183037303724143289510001000100030373037111001100000073216222629100030383038303830383038
100430372303061254725100010001000398160030183037303724143289510001000100030373037111001100000073216222629100030383038303830383038
100430372400061254725100010001000398160030183037303724143289510001000100030373037111001100000073216222629100030383038303830383038
100430372300061254725100010001000398160030183037303724143289510001000100030373037111001100000073216222629100030383038303830383038
100430372300061254725100010001000398160030183037303724143289510001000100030373037111001100000073216222629100030383038303830383038

Test 2: Latency 1->2

Code:

  fcvtpu v0.2d, v0.2d
  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)030e0f18191e3f4e51schedule 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)e0e2? simd retires (ee)? int retires (ef)f5f6f7f8fd
1020430037233001112131295474410100100100001001000050042771601300183003730037282643287451010020010000200100003003730037111020110099100100100001003071011611296330100001003003830038300383003830038
10204300372418000061295472510100100100001001000050042771600300183003730037282643287451010020010000200100003003730082111020110099100100100001000071011611296330100001003003830038300383003830038
102043003723200001261295472510100100100001001000050042771600300183003730037282643287451010020010000200100003003730037111020110099100100100001000071011611296330100001003003830038300383003830038
102043003723300001266295472510100100100001001000050042771601300183003730037282643287451010020010000200100003003730037111020110099100100100001000071011611296330100001003003830038300383003830038
102043003723300001261295472510100100100001001000050042771600300183003730037282643287451010020010000200100003003730037111020110099100100100001000080611611296330100001003003830038300383003830038
10204300372330000061295472510100100100001001000050042771600300183003730037282643287451010020010000200100003003730037111020110099100100100001000071011611296330100001003003830038300383003830038
10204300372330000061295472510100100100001001000050042771600300183003730037282643287451010020010000200100003003730037111020110099100100100001000071031611296330100001003003830038300383003830038
1020430037233000002512954725101001001000010010000500427716013001830037300372826432874510100200100002001000030037300371110201100991001001000010001271011611296330100001003003830038300383003830038
102043003723300000103295472510100100100001001000050042771601300183003730037282643287451010020010000200100003003730037111020110099100100100001000071011611296330100001003003830038300383003830038
10204300372330000061295472510100100100001001000050042771600300183007030037282643287451010020010000200100003003730037111020110099100100100001000071011611296330100001003003830038300383003830038

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)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 cache writeback (a8)accfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)? int retires (ef)f5f6f7f8fd
100243003722506129547251001010100001010000504277160030018030037300372828603287671001020100002010000300373003711100211091010100001000640216222962910000103003830038300383003830038
100243003722506129547251001010100001010000504277160030018030037300372828603287671001020100002010172300373003711100211091010100001023640216222962910000103003830038300383003830038
10024300372331214529547251001010100001010000504277160030018030037300372828603287671001020100002010000300373003711100211091010100001000640216222962910000103003830038300383008130038
100243003722506129547251001010100001010000504277160130018030037300372828603287671001020100002010000300373003711100211091010100001000640216222970110000103003830038300383003830038
100243003722506129547251001010100001010000504278512030018030037300372828603287671001020100002010000300373003711100211091010100001000640216222962910000103003830038300383003830038
100243003722506129547251001010100001010000504277160030018030037300372828603287671001020100002010000300373003711100211091010100001000640216222962910000103003830038300383003830038
100243003722506129547251001010100001010000504277160030018030037300372828603287671001020100002010000300373003711100211091010100001000640216222962910000103003830038300383003830038
100243003722506129547251001010100001010000504277160030018030037300372828603287671001020100002010000300373003711100211091010100001000640216222962910000103003830038300383003830038
100243003722506129547251001010100001010000504277160030018030037300372828603287671001020100002010000300373003711100211091010100001000640216222962910000103003830038300383003830038
100243003722506129547431001010100001010000504277160130018030037300372828603287671001020100002010000300373003711100211091010100001000669216222962910000103003830038300383003830038

Test 3: throughput

Count: 8

Code:

  fcvtpu v0.2d, v8.2d
  fcvtpu v1.2d, v8.2d
  fcvtpu v2.2d, v8.2d
  fcvtpu v3.2d, v8.2d
  fcvtpu v4.2d, v8.2d
  fcvtpu v5.2d, v8.2d
  fcvtpu v6.2d, v8.2d
  fcvtpu v7.2d, v8.2d
  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)03l2 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)5e60696d6emap 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)acc2c3branch 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
8020420050155000210114258010810080008100800205006401320120020200392003999776999080120200800322008003220039200391180201100991001008000010000000111511801600200360800001002004020040200402004020040
80204200391550000030258010810080008100800205006401320020020200392003999776999080120200800322008003220039200391180201100991001008000010000000111511801600200360800001002004020040200402004020040
802042003915510012030258010810080008100800205006401320120020200392003999776999080120200800322008003220039200391180201100991001008000010001000111511801600200860800001002004020040200402004020040
80204200391550000030258010810080008100800205006401320020020200392003999776999080120200800322008003220039200391180201100991001008000010000000111511801600200360800001002004020040200402004020040
80204200391550000030258010810080008100800205006401320020020200392003999776999080120200800322008003220039200391180201100991001008000010000000111511801600200360800001002004020040200402004020040
80204200391560000072258010810080008100800205006401320020020200392003999776999080120200800322008003220039200391180201100991001008000010000000111511801600200360800001002004020040200402004020040
80204200391550000030258010810080008100800205006401320020020200392003999776999080120200800322008003220039200391180201100991001008000010000000111511801600200360800001002004020040200402004020040
80204200391550000030258010810080008100800205006401320020020200392003999776999080120200800322008003220039200391180201100991001008000010000000111511801600200360800001002004020040200402004020040
802042003916000012030258010810080008100800205006401320020020200392003999776999080120200800322008003220039200391180201100991001008000010000300111511801600200360800001002004020040200402004020040
80204200391550000030258010810080008100800205006401320020020200392003999776999080120200800322008003220039200891180201100991001008000010000000111511801600200360800001002004020040200402004020040

1000 unrolls and 10 iterations

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

retire uop (01)cycle (02)03l2 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)6061696d6emap 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)a9acc2c3cdcfd0d2d5map dispatch bubble (d6)dadbddfetch restart (de)e0? simd retires (ee)? int retires (ef)f5f6f7f8fd
8002420051156000465004025800101080000108000050640000102002020039200399996310019800102080000208000020039200391180021109101080000100000000050370041600772003680000102004020040200402004020040
8002420039155000486004025800101080000108000050640000102002020039200399996310019800102080000208000020039200391180021109101080000100000000050200041600432003680000102004020091200402004020040
8002420039155000105004025800101080000108000050640000002002020039200399996310019800102080000208000020039200391180021109101080000100010000050200041600342003680000102004020040200402004020040
800242003915500000015625800101080000108000050640000002002020039200399996310019800102080000208000020039200391180021109101080000100000000050200041600672003680000102004020040200402004020040
80024200391550000004025800101080000108000050640000102002020039200399996310019800102080000208000020039200391180021109101080000100000000050200031600662003680000102004020040200402004020040
800242003915500060004025800101080000108000050640000102002020039200399996310019800102080000208000020039200391180021109101080000100000000050200031600342003680000102004020040200402004020040
80024200391550000004025800101080000108000050640000102002020039200399996310019800102080000208000020039200391180021109101080000100000000050200071600442003680000102004020040200402004020040
80024200391550000004025800101080000108000050640000102002020039200399996310019800102080000208000020039200391180021109101080000100000000050200071600432003680000102004020040200402004020040
800242003915500036004025800101080000108000050640000102002020039200399996310019800102080000208000020039200391180021109101080000100000000050200031600442003680000102004020040200402004020040
80024200391550000004025800101080000108000050640000102002020090200399996310019800102080000208000020039200391180021109101080000100000000050200071600662003680000102004020040200402004020040