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

MVNI (vector, 2S)

Test 1: uops

Code:

  mvni v0.2s, #3

(no loop instructions)

1000 unrolls and 1 iteration

Retires: 1.000

Issues: 1.000

Integer unit issues: 0.001

Load/store unit issues: 0.000

SIMD/FP unit issues: 1.000

retire uop (01)cycle (02)schedule uop (52)schedule int uop (53)schedule simd uop (54)dispatch simd uop (57)ldst uops in schedulers (5b)dispatch uop (78)map simd uop (7e)? int output thing (e9)? simd retires (ee)
1004594100111000100040001000100011000
1004534100111000100040001000100011000
1004534100111000100040001000100011000
1004534100111000100040001000100011000
1004534100111000100040001000100011000
1004534100111000100040001000100011000
1004534100111000100040001000100011000
1004534100111000100040001000100011000
1004534100111000100040001000100011000
1004534100111000100040001000100011000

Test 2: throughput

Count: 8

Code:

  mvni v0.2s, #3
  mvni v1.2s, #3
  mvni v2.2s, #3
  mvni v3.2s, #3
  mvni v4.2s, #3
  mvni v5.2s, #3
  mvni v6.2s, #3
  mvni v7.2s, #3

(fused SUBS/B.cc loop)

100 unrolls and 100 iterations

Result (median cycles for code divided by count): 0.5004

retire uop (01)cycle (02)schedule uop (52)schedule int uop (53)schedule simd uop (54)schedule ldst uop (55)dispatch int uop (56)dispatch simd uop (57)int uops in schedulers (59)ldst uops in schedulers (5b)dispatch uop (78)map int uop (7c)map simd uop (7e)map int uop inputs (7f)? int output thing (e9)? simd retires (ee)? int retires (ef)
80682440958059639780038161342800503003200528011220080015200180000100
802044005380107101800060100800103003200368010820080012200180000100
802044003580109101800080100800123003200488011120080015200180000100
802044003480105101800040100800083003202008015220080060200180000100
802044004480107101800060100800103003200368010820080012200180000100
802044003480105101800040100800083003200368010820080012200180000100
802044003480105101800040100800083003200368010820080012200180000100
802044003480105101800040100800083003200368010820080012200180000100
802044003480105101800040100800083003200368010820080012200180000100
802044003480105101800040100800083003200368010820080012200180000100

1000 unrolls and 10 iterations

Result (median cycles for code divided by count): 0.5004

retire uop (01)cycle (02)schedule 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)dispatch uop (78)map int uop (7c)map simd uop (7e)map int uop inputs (7f)? int output thing (e9)? simd retires (ee)? int retires (ef)
800244020380027218000620800106932000080020208000020118000010
800244003480021218000020800006532000080020208000020118000010
800244003480021218000020800006532000080020208000020118000010
800244003480021218000020800006532000080020208000020118000010
800244003480021218000020800006532000080020208000020118000010
800244003480021218000020800006532000080020208000020118000010
800244003480021218000020800006532000080020208000020118000010
800244003480021218000020800006532000080020208000020118000010
800244003480021218000020800006532000080020208000020118000010
800244003480021218000020800006532000080020208000020118000010