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

FCVTNU (vector, 2D)

Test 1: uops

Code:

  fcvtnu 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)03181e3f4e51schedule 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
1004303723096125472510001000100039816003018303730372414328951000100010003037303711100110000073116112629100030383038303830383038
1004303723008225472510001000100039816003018303730372414328951000100010003037303711100110000073116112629100030383038303830383038
1004303723006125472510001000100039816003018303730372414328951000100010003037303711100110000073116112629100030383038303830383038
1004303723006125472510001000100039816003018303730372414328951000100010003037303711100110000073116112629100030383038303830383038
1004303724006125472510001000100039816003018303730372414328951000100010003037303711100110000073116112629100030383038303830383038
100430372301986125472510001000100039816003018303730372414328951000100010003037303711100110000073116112629100030383038303830383038
1004303723036125472510001000100039816003018303730372414328951000100010003037303711100110000073116112629100030383038303830383038
1004303724066125472510001000100039816003018303730372414328951000100010003037303711100110000073116112629100030383038303830383038
10043037230246125472510001000100039816003018303730372414328951000100010003037303711100110000073116112629100030383038303830383038
1004303724006125472510001000100039816003018303730372414328951000100010003037303711100110000073116112629100030383038303830383038

Test 2: Latency 1->2

Code:

  fcvtnu 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)0318191e1f3a3f4e51schedule 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? int output thing (e9)eb? simd retires (ee)? int retires (ef)f5f6f7f8fd
102043003724100000234295472510100100100001001000050042771601300183003730037282643287451010020010000200100003003730037111020110099100100100001000093741202430164400100001003075530553307053069830656
1020430706246141418481144190112942829110266151100241001015079142894531300183003730085283126928980121162361231624012321307023056111110201100991001001000010000710216222963300100001003003830038300383003830038
1020430037233000001682954725101001001000010010000500427716003001830037300372826432874510100200100002001000030037300371110201100991001001000010000710216222963300100001003003830038300383003830038
1020430037233000004632954725101001001000010010000500427716013001830037300372826432874510100200100002001000030037300371110201100991001001000010000710216222963300100001003003830038300383003830038
10204300372330012001662954725101001001000010010000500427716013001830037300372826432874510100200100002001000030037300371110201100991001001000010000710216222963300100001003003830038300383003830038
10204300372320000022002954725101001001000010010000500427716013001830037300372826432874510100200100002001000030037300371110201100991001001000010000710216222963300100001003003830038300383003830038
1020430037233000004292954725101001001000010010000500427716013001830037300372826432874510100200100002001000030037300371110201100991001001000010000710216222963300100001003003830038300383003830038
1020430037233000004072954725101001001000010010000500427716013001830037300372826432874510100200100002001000030037300371110201100991001001000010003710216222963300100001003003830038300383003830038
10204300372330012009262954725101001001000010010000500427716013001830037300372826432874510100200100002001018030037300371110201100991001001000010000710216222963300100001003003830038300383003830038
1020430037233000001452954725101001001000010010000500427716013001830037300372826432874510100200100002001000030037300371110201100991001001000010000710216222963300100001003003830038300383003830038

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)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)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 tlb access (a0)l1d tlb miss (a1)l1d cache writeback (a8)a9acc2cdcfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? simd retires (ee)? int retires (ef)f5f6f7f8fd
1002430037233000000000612954725100101010000101000050427716003001803003730037282863287671001020100002010000300373003711100211091010100001000000006404162229629010000103003830038300383003830038
1002430037233000000000612954725100101010000101000050427716003001803003730037282863287671001020100002010000300373003711100211091010100001000000006402162229629010000103003830038300383003830038
10024300372250000000002642954725100101010000101000050427716003001803003730037282863287671001020100002010000300373003711100211091010100001000000006402162229629010000103003830038300383003830038
1002430037225000000000822954725100101010000101000050427716003001803003730037282863287671001020100002010000300373003711100211091010100001000000006402162229629410000103027430415302283041530180
1002430213228200118354601032954749100191310008101015050428256803009003008430085282887288051016220103312010166301323008421100211091010100001002243206402242229629010000103008530038300383008530038
1002430037225000000000337329484118100871210064171090087427716003001803003730037282863287671001020101612010000300373013211100211091010100001042142833006814162229629010000103003830038300383013230038
10024300842250110000278814572954725100101010000101000050427716003001803003730037282863287671001020100002010000300373003711100211091010100001000000006402162229629010000103003830038300383003830038
1002430037225000000000612954725100101010000101000050427716003001803003730037282863287671001020100002010000300373003711100211091010100001000000006402162229629010000103003830038300383003830038
1002430037224000000090612954725100101010000101000050427716003001803003730037282863287671001020100002010000300373003711100211091010100001000000006402162229629010000103003830038300383003830038
1002430037225000000000612954725100101010000101000050427716003001803003730037282863287671001020100002010000300373003711100211091010100001000000006402162229629010000103003830038300383003830038

Test 3: throughput

Count: 8

Code:

  fcvtnu v0.2d, v8.2d
  fcvtnu v1.2d, v8.2d
  fcvtnu v2.2d, v8.2d
  fcvtnu v3.2d, v8.2d
  fcvtnu v4.2d, v8.2d
  fcvtnu v5.2d, v8.2d
  fcvtnu v6.2d, v8.2d
  fcvtnu 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)03mmu table walk instruction (07)mmu table walk data (08)l2 tlb miss instruction (0a)1e3a3f51schedule 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)acbranch cond mispred nonspec (c5)branch mispred nonspec (cb)cdcfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)? int retires (ef)f5f6f7f8fd
8020420048155101018225801081008000810080020500640132020106201032003999876999080120200800322008003220039200391180201100991001008000010020011151181161120036800001002004020040200402004020040
80204200391551011203025801081008000810080020500640132020020200392003999776999080120200800322008003220039200391180201100991001008000010000011151181161120036800001002004020040200402004020040
8020420039155101003025801081008000810080020500640132020020200392003999776999080120200800322008003220039200391180201100991001008000010000011151181161120036800001002004020040200402004020040
8020420039155101007225801081008000810080020500640132020020200392003999776999080120200800322008003220039200391180201100991001008000010000311151181161420036800001002004020040200402004020040
8020420039155101003025801081008000810080020500640132120020200392003999776999080120200800322008003220039200391180201100991001008000010000011151181161120036800001002004020040200402004020040
80204200391551010077625801081008000810080020500640132120020200392003999776999080120200800322008003220039200391180201100991001008000010000011151381161120036800001002004020040200402009420040
802042003915501012011425801081008000810080020500640132020020200392003999776999080120200800322008003220039200391180201100991001008000010000311151181161120036800001002004020040200402004020040
8020420039156000003025801081008000810080020500640132120020200392003999776999080120200800322008003220039200391180201100991001008000010001011151181161120036800001002004020040200402004020040
8020420039156000003025801081008000810080020500640132120020200392003999776999080120200800322008003220039200391180201100991001008000010000011151181161120036800001002004020040200402004020040
8020420039155000003025801081008000810080020500640132020020200392003999776999080120200800322008003220039200391180201100991001008000010005011151181162120036800001002004020040200402004020040

1000 unrolls and 10 iterations

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

retire uop (01)cycle (02)031e3f51schedule 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 cache writeback (a8)a9accfl1i cache miss demand (d3)d5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)? int retires (ef)f5f6f7f8fd
80024200501559402580010108000010800005064000020020200392003999963100198001020800002080000200392003911800211091010800001010050202316232003680000102004020040200402004020040
80024200391560402580010108000010800005064000020020200392003999963100198001020800002080000200392003911800211091010800001000050201316332003680000102004020040200402004020040
80024200391550402580010108000010800005064000020020200392003999963100198001020800002080000200392003911800211091010800001000050200316322003680000102004020040200402004020040
80024200391610402580010108000010800005064000020020200392003999963100198001020800002080000200392003911800211091010800001010050200216322003680000102004020040200402004020040
80024200391550402580010108000010800005064000020020200392003999963100198001020800002080000200392003911800211091010800001000050200316332003680000102004020040200402004020040
80024200391550822580010108000010800005064000020020200392003999963100198001020800002080000200392003911800211091010800001000050200216332003680000102004020040200402004020040
80024200391550402580010108000010800005064000020020200392003999963100198001020800002080000200392003911800211091010800001000050200316232003680000102004020040200402004020040
800242003915512402580010108000010800005064000020020200392003999963100198001020800002080000200392003911800211091010800001000050200316332003680000102004020040200402004020040
80024200391550402580010108000010800005064000020020200392003999963100198001020800002080000200392003911800211091010800001000350200316332003680000102004020040200402004020040
80024200391560402580010108000010800005064000020020200392003999963100198001020800002080000200392003911800211091010800001000050200316232003680000102004020040200402004020040