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

UQXTN (2D)

Test 1: uops

Code:

  uqxtn v0.2s, 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)0318191e1f3a3f4e51schedule 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)cfd0d5map dispatch bubble (d6)ddfetch restart (de)dfe0? simd retires (ee)f5f6f7f8fd
1004303723001500272254725100010001000398160130183037303724143289510001000100030373037111001100007902161132629100030383038303830383038
10043037230090372254725100010001000398160030183037303724143289510001000100030373037111001100007941161132629100030383038303830383038
10043037230000372254725100010001000398160130183037303724143289510001000100030373037111001100007941161132629100030383038303830383038
1004303722001803167254725100010001000398160030183037303724143289510001000100030373037111001100007941161132629100030383038303830383038
10043037220000372254725100010001000398160030183037303724143289510001000100030373037111001100007941161132629100030383038303830383038
10043037220000372254725100010001000398160030183037303724143289510001000100030373037111001100007941161132629100030383038303830383038
10043037220090372254725100010001000398160030183037303724143289510001000100030373037111001100007941161132629100030383038303830383038
10043037230000372254725100010001000398160130183037303724143289510001000100030373037111001100007941161132629100030383038303830383038
100430372300120372254725100010001000398160030183037303724143289510001000100030373037111001100007941161132629100030383038303830383038
10043037220000372254725100010001000398160030183037303724143289510001000100030373037111001100007941161132629100030383038303830383038

Test 2: Latency 1->2

Code:

  uqxtn v0.2s, 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)03181e1f3a3f4e51schedule 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 cache writeback (a8)a9accfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? simd retires (ee)? int retires (ef)f5f6f7f8fd
1020430037259030082129547251010010010000100100005004277160130018300373003728264328745101002001000020010000300373003711102011009910010010000100000071011611296330100001003003830038300383003830038
102043003725900006129547251010010010000100100005004277160030018300373003728264328745101002001000020010000300373003711102011009910010010000100000071011611296330100001003003830038300383003830038
102043003724100006129547251010010010000100100005004277160030018300373003728264328745101002001000020010000300373003711102011009910010010000100200071011611296330100001003003830038300383003830038
102043003724200006129547251010010010000100100005004277160030018300373003728264328745101002001000020010000300373003711102011009910010010000100000071011611296330100001003003830038300383003830038
102043003724100006129547251010010010000100100005004277160030018300373003728264328747101002001000020010000300373003711102011009910010010000100000071011611296330100001003003830038300383003830038
1020430037232000049129547251010010010000100100005004277160130018300373003728264328745104182001000020010000300373003711102011009910010010000100000071011611296330100001003003830038300383003830038
102053003723300006129547251010010010000100100005004277160030018300373003728264328745101002041000020010000300373003711102011009910010010000100000071011621296337100001003003830038300383003830038
102043003723300006129547251010010010000100100005004277160130018300373003728264328745101002001000020010000300373003711102011009910010010000100000071011611296330100001003003830038300383003830038
102043003722900006129547251010010010000100100005004277160030018300373003728264328745101002001000020010000300373003711102011009910010010000100000071011611296330100001003003830038300383003830038
102043003722900006129547251010010010000100100005004277160030018300373003728264328745101002001000020010000300373003711102011009910010010000100000071011611296330100001003003830038300383003830038

1000 unrolls and 10 iterations

Result (median cycles for code): 3.0037

retire uop (01)cycle (02)03mmu table walk data (08)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)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)l1d tlb miss (a1)ld unit uop (a6)st unit uop (a7)l1d cache writeback (a8)a9acc2cfd0d5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? simd retires (ee)? int retires (ef)f5f6f7f8fd
100243003722500000061295472510010101000010100005042771600230018300373003728286328767100102010000201000030037300371110021109101010000100000000064003162229629010000103003830038300383003830038
100243003722500000061295472510010101000010100005042771600030018300373003728286328767100102010000201000030037300371110021109101010000100000000064002162229629010000103003830038300383003830038
100243003722500000061295472510010101000010100005042771600030018300373003728286328767100102010000201000030037300371110021109101010000100000000064022162229629010000103003830038300383003830038
100243003722500000061295472510010101000010100005042771600030018300373003728286328767100102010000201000030037300371110021109101010000100000000064002162229629010000103003830038300383003830038
100243003722400000061295472510010101000010100005042771601030018300373003728286328767100102010000201000030037300371110021109101010000100000006064002162229629010000103003830038300383003830038
100243003722500000061295472510010101000010100005042771600030018300373003728286328767100102010000201000030037300371110021109101010000100000000064002162229629010000103003830038300383003830038
1002430037225010000726295472510010101000010100005042771600030018300373008528286328767100102010000201000030037300371110021109101010000100000000064002162229629010000103003830038300383003830038
1002430037225000000346295472510010101000010100005042771601030018300373003728286328767100102010000201000030037300371110021109101010000100000000064002162229629010000103003830038300383003830038
1002430037224000000726295472510010101000010100005042771601030018300373003728286328767100102010000201000030037300371110021109101010000100000000064002162229629010000103003830038300383003830038
10024300372250000005362954725100101010000101000050427716000300183003730037282861628786100102010000201000030037300371110021109101010000100000000064002162229629010000103003830038300383003830038

Test 3: throughput

Count: 8

Code:

  uqxtn v0.2s, v8.2d
  uqxtn v1.2s, v8.2d
  uqxtn v2.2s, v8.2d
  uqxtn v3.2s, v8.2d
  uqxtn v4.2s, v8.2d
  uqxtn v5.2s, v8.2d
  uqxtn v6.2s, v8.2d
  uqxtn v7.2s, 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)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)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)a9acbranch cond mispred nonspec (c5)branch mispred nonspec (cb)cdcfmap dispatch bubble (d6)dde0? int output thing (e9)? simd retires (ee)? int retires (ef)f5f6f7f8fd
802042003915001562580108100800081008002050064013202002020039200399977699908012020080032200800322003920039118020110099100100800001000001115118160200360800001002004020040200402004020040
80204200391500302580108100800081008002050064013202002020039200399977699908012020080032200800322003920039118020110099100100800001000001115118160200360800001002004020040200402004020040
802042003915001142580108100800081008002050064013212002020039200399977699908012020080032200800322003920039118020110099100100800001000001115118160200360800001002004020040200402004020040
80204200391500302580108100800081008002050064013202002020039200399977699908012020080032200800322003920039118020110099100100800001000001115118160200360800001002004020090201462004020040
802042003915009382580108100800081008002050064013202002020039200399977699908012020080032200800322003920039118020110099100100800001000001115118160200360800001002004020040200402004020040
80204200391500932580108100800081008002050064013202002020039200399977699908012020080032200800322003920039118020110099100100800001000001115118160200360800001002004020040200402004020040
80204200391500302580108100800081008002050064013202002020039200399977699908012020080032200800322003920039118020110099100100800001000001115118160200360800001002004020040200402004020040
80204200391500302580108100800081008002050064013202002020039200399977699908012020080032200800322003920039118020110099100100800001000001115118160200360800001002004020040200402004020040
80204200391500302580108100800081008002050064013202002020039200399977699908012020080032200800322003920039118020110099100100800001000001115118161200360800001002004020040201492004020040
80204200391500302580108100800081008002050064019602002020039200399977699908012020080032200800322003920039118020110099100100800001000001115118160200360800001002004020040200402004020040

1000 unrolls and 10 iterations

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

retire uop (01)cycle (02)03l1i tlb fill (04)091e3a3f51schedule 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)accfd0d2l1i cache miss demand (d3)l1i tlb miss demand (d4)d5map dispatch bubble (d6)d9dadbddfetch restart (de)e0eaeb? simd retires (ee)? int retires (ef)f5f6f7f8fd
8002420050150110016625800101080000108000050640000020020200392003999963100198001020800002080000200392003911800211091010800001000502100011816000917200360080000102004020040200402004020040
800242003915011001422580010108000010800005064000002002020039200399996310019800102080000208000020039200391180021109101080000100050210001181600011182003621780000102004020040200402004020040
800242003915011001352580010108000010800005064000012002020039200399996310019800102080000208000020039200391180021109101080000100050210001171600011182003620080000102004020040200402004020040
80024200391501100115258001010800001080000506400001200202003920039999631001980010208000020800002003920039118002110910108000010035021031117161001920200360080000102004020040200402004020040
800242003915011011152580010108000010800005064000012002020039200399996310019800102080000208000020039200391180021109101080000100050210311181600018182003641080000102004020040200402004020040
800242003915011001162580010108000010800005064000002002020039200399996310019800102080000208000020039200391180021109101080000100050210001191600010182003620080000102004020040200402004020040
80024200391501100110258001010800001080000506400000200202003920039999631001980010208000020800002003920039118002110910108000010005021000191600018102003621080000102004020040200402004020040
800242003915011301152580010108000010800005064000012002020039200399996310019800102080000208000020039200391180021109101080000100050210001111600017142003620080000102004020040200402004020040
800242003915011001162580010108000010800005064000012002020039200399996310019800102080000208000020039200391180021109101080000100050210001181600018172003641080000102004020040200402004020040
800242003915011002662580010108000010800005064000012002020039200399996310019800102080000208000020039200391180021109101080000100050210001181600017182003621080000102004020040200402004020040