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

URSHR (vector, 8B)

Test 1: uops

Code:

  urshr v0.8b, v0.8b, #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)03l2 tlb miss data (0b)18191e3f4e51schedule 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 tlb access (a0)l1d cache writeback (a8)accfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)f5f6f7f8fd
100430372200006125472510001000100039816030183037303724143289510001000100030373037111001100000073116112629100030383038303830383038
100430372200006125472510001000100039816030183037303724143289510001000100030373037111001100000073116112629100030383038303830383038
1004303722000010325472510001000100039816030183037303724143289510001000100030373037111001100000073116112629100030383038303830383038
100430372300006125472510001000100039816030183037303724143289510001000100030373037111001100000073116112629100030383038303830383038
100430372300006125472510001000100039816030183037303724143289510001000100030373037111001100000073116112629100030383038303830383038
100430372300096125472510001000100039816030183037303724143289510001000100030373037111001100000073116112629100030383038303830383038
100430372300006125472510001000100039816030183037303724143289510001000100030373037111001100000373116112629100030383038303830383071
100430372300006125472510001000100039816030183037303724143289510001000100030373037111001100000073116112629100030383038303830383038
100430372200038425472510001000100039816030183037303724143289510001000100030373037111001100000073116112629100030383038303830383038
1004303723000246125472510001000100039816030183037303724143289510001000100030373037111001100000073116112629100030383038303830383038

Test 2: Latency 1->2

Code:

  urshr v0.8b, v0.8b, #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)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)9facbranch mispred nonspec (cb)cfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? simd retires (ee)? int retires (ef)f5f6f7f8fd
102043003722506129547251010010010000100100005004277160300183003730037282643287451010020010000200100003003730037111020110099100100100001000071011611296330100001003003830038300383003830038
102043003722506129547251010010010000100100005004277160300183003730037282643287451010020010000200100003003730037111020110099100100100001000071011611296330100001003003830038300383003830038
102043003722506129547251010010010000100100005004277160300183003730037282643287451010020010000200100003003730037111020110099100100100001000071011611296330100001003003830038300383003830038
102043003722506129547251010010010000100100005004277160300183003730037282643287451010020010000200100003003730037111020110099100100100001000071011611296330100001003003830038300383003830038
102043003722506129547251010010010000100100005004277160300183003730037282643287451010020010000200100003003730037111020110099100100100001000071011611296330100001003003830038300383003830038
1020430037225061295472510100100100001001000050042771603001830037300372826427287451010020010000200100003003730037111020110099100100100001000071011611296330100001003003830038300383003830038
102043003722506129547251010010010000100100005004277160300183003730037282643287451010020010000200100003003730037111020110099100100100001000071011611296330100001003003830038300383003830038
102043003722506129547251010010010000100100005004277160300183003730037282643287451010020010000200100003003730037111020110099100100100001000071011611296330100001003003830038300383003830038
102043003722506129547251010010010000100100005004277160300183003730037282643287451010020010000200100003003730037111020110099100100100001000071011611296330100001003003830038300383003830038
102043003722506129547251010010010000100100005004277160300183003730037282643287451010020010000200100003003730037111020110099100100100001000071011611296330100001003003830038300383003830038

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)18191e1f3a3f4e51schedule 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)a9acc2cdcfd5map dispatch bubble (d6)ddfetch restart (de)e0? int output thing (e9)? simd retires (ee)? int retires (ef)f5f6f7f8fd
100243003722500000005100612954725100101010000101000050427716030018300373003728286328767100102010000201000030037300371110021109101010000100000000006404164329629010000103003830038300383003830038
100243003722500000003300612954725100101010000101000050427716030018300373003728286328767100102010000201000030037300371110021109101010000100000000006404163429629010000103003830038300383003830038
100243003722500000004800612954725100101010000101000050427716030018300373003728286328767100102010000201000030037300371110021109101010000100000000006404164329629010000103003830038300383003830038
100243003722400000000002512954725100101010000101000050427716030018300373003728286328767100102010162201000030037300371110021109101010000100000000006404163429629010000103003830038300383003830038
100243003722500000004200612954725100101010000101000050427716030018300373003728286328767100102010000201000030037300371110021109101010000100000000006404163429629010000103003830038300383003830038
1002430037225000000030006129547251001010100001010000504277160300183003730037282863287671001020100002010000300373003711100211091010100001000000012006404163429629010000103003830038300383003830038
10024300372250000000300612954725100101010000101000050427716030018300373003728286328767100102010000201000030037300371110021109101010000100000000006403164329629010000103003830038300383003830038
1002430037225000000042001032954725100101010000101000050427716030018300373003728286328767100102010000201000030180300371110021109101010000100000000006404164429629010000103003830038300383003830038
100243003722500000001500612954725100101010000101000050427716030018300373003728286328767100102010000201000030037300371110021109101010000100000000006404163429629010000103003830038300383003830038
10024300372250000056924616045182948415410038121004816109006142866243027030322304052831412288991121520111432211153303683032291100211091010100001044210018193207467814429881410000103037230358303703036830415

Test 3: throughput

Count: 8

Code:

  urshr v0.8b, v8.8b, #3
  urshr v1.8b, v8.8b, #3
  urshr v2.8b, v8.8b, #3
  urshr v3.8b, v8.8b, #3
  urshr v4.8b, v8.8b, #3
  urshr v5.8b, v8.8b, #3
  urshr v6.8b, v8.8b, #3
  urshr v7.8b, v8.8b, #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)0318191e203f51schedule 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)ld unit uop (a6)l1d cache writeback (a8)acc2branch cond mispred nonspec (c5)branch mispred nonspec (cb)cdcfd5map dispatch bubble (d6)ddfetch restart (de)e0? simd retires (ee)? int retires (ef)f5f6f7f8fd
8020420061150000030258010810080008100800205006401322002020039200399977699908012020080032200800322003920039118020110099100100800001000000011151180160020036800001002004020040200402004020040
8020420039150000030258010810080008100800205006401322002020039200399977699908012020080032200800322003920039118020110099100100800001000000011151180160020036800001002004020040200402004020040
8020420039150000030258010810080008100800205006401322002020039200399977699908012020080032200800322003920039118020110099100100800001000000011151180160020036800001002004020040200402004020040
8020420039150000030258010810080008100800205006401322002020039200399977699908012020080032200800322003920039118020110099100100800001000000011151180160020036800001002004020040200402004020040
8020420039150000030258010810080008100800205006401322002020039200399977699908012020080032200800322003920039118020110099100100800001000000011151180160020036800001002004020040200402004020040
8020420039150000030258010810080008100800205006401322002020039200399977699908012020080032200800322003920039118020110099100100800001000000011151180160020036800001002004020040200402004020040
8020420039150000030258010810080008100800205006401322002020039200399977699908012020080032200800322003920039118020110099100100800001000000011151180160020036800001002004020040200402004020040
8020420039150000030258010810080008100800205006401322002020039200399977699908012020080032200800322003920039118020110099100100800001000000011151180160020036800001002004020040200402004020040
8020420039150000030258010810080008100800205006401322002020039200399977699908012020080032200800322003920039118020110099100100800001000000011151180160020036800001002004020040200402004020040
8020420039150000030258010810080008100800205006401322002020039200399977699908012020080032200800322003920039118020110099100100800001000000011151180160020036800001002004020040200402004020040

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)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)st unit uop (a7)l1d cache writeback (a8)acbranch mispred nonspec (cb)cfd0d5map dispatch bubble (d6)dbddfetch restart (de)e0eb? simd retires (ee)? int retires (ef)f5f6f7f8fd
800242003915004025800101080000108000050640000020020200392003999963100198001020800002080000200392003911800211091010800001001612050200416044200362180000102004020040200402004020040
8002420039150040258001010800001080000506400000200202003920039999631001980010208000020800002003920039118002110910108000010000005020061604620036080000102004020040200402004020040
8002420039150040258001010800001080000506400000200202003920039999631001980010208000020800002003920039118002110910108000010000305020031607720036080000102004020040200402004020040
8002420039150040258001010800001080000506400001200202003920039999631001980010208000020800002003920039118002110910108000010000005020061606620036080000102004020040200402004020040
8002420039150040258001010800001080000506400000200202003920039999631001980010208000020800002003920039118002110910108000010000005020071604420036080000102004020040200402004020040
8002420039150040258001010800001080000506400001200202003920039999631001980010208000020800002003920039118002110910108000010000005020031603420036080000102004020040200402004020040
8002420039150040258001010800001080000506400001200202003920039999631001980010208000020800002003920039118002110910108000010000005020061604420036080000102004020040200402004020040
8002420039150040258001010800001080000506400001200202003920039999631001980010208000020800002003920039118002110910108000010000005020071604320036080000102004020040200402004020040
8002420039150040258001010800001080000506400001200202003920039999631001980010208000020800002003920039118002110910108000010000005020031604720036080000102004020040200402004020040
800242003915004025800101080000108000050640000020020200392003999963100198001020801052080000200392003911800211091010800001020047305020061604420036080000102004020040200402004020040