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

MRS (APRR)

Test 1: uops

Code:

  mrs x0, s3_6_c15_c1_5

(no loop instructions)

1000 unrolls and 1 iteration

Retires: 1.000

Issues: 1.000

Integer unit issues: 1.001

Load/store unit issues: 0.000

SIMD/FP unit issues: 0.000

retire uop (01)cycle (02)schedule uop (52)schedule int uop (53)? int output thing (e9)? int retires (ef)
100412811001100110011000
100412811001100110011000
100412811001100110011000
100412811001100110011000
100412811001100110011000
100412811001100110011000
100412811001100110011000
100412811001100110011000
100412811001100110011000
100412811001100110011000

Test 2: throughput

Count: 8

Code:

  mrs x0, s3_6_c15_c1_5
  mrs x1, s3_6_c15_c1_5
  mrs x2, s3_6_c15_c1_5
  mrs x3, s3_6_c15_c1_5
  mrs x4, s3_6_c15_c1_5
  mrs x5, s3_6_c15_c1_5
  mrs x6, s3_6_c15_c1_5
  mrs x7, s3_6_c15_c1_5

(fused SUBS/B.cc loop)

100 unrolls and 100 iterations

Result (median cycles for code divided by count): 1.2504

retire uop (01)cycle (02)schedule uop (52)schedule int uop (53)dispatch int uop (56)int uops in schedulers (59)dispatch uop (78)map int uop (7c)map int uop inputs (7f)? int output thing (e9)? int retires (ef)
8020410005380101801011003001002002008000980100
8020410003580101801011003001002002008000180100
8020410003580101801011003001002002008000180100
8020410003580101801011003001002002008000180100
8020410003580101801011003001002002008000180100
8020410003580101801011003001002002008000180100
8020410003580101801011003001002002008000180100
8020410003580101801011003001002002008000180100
8020410003580101801011003001002002008000180100
8020410003580101801011003001002002008000180100

1000 unrolls and 10 iterations

Result (median cycles for code divided by count): 1.2504

retire uop (01)cycle (02)schedule uop (52)schedule int uop (53)dispatch int uop (56)int uops in schedulers (59)dispatch uop (78)map int uop (7c)map int uop inputs (7f)? int output thing (e9)? int retires (ef)
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80025100066800198001910301020208000180010
80024100031800118001110301020208000180010
80024100031800118001110301020208000180010
80024100031800118001110301020208000180010
80024100031800118001110301020208000180010
80024100031800118001110301020208000980010
80024100031800118001110301020208000180010
80024100031800118001110301020208000180010
80024100031800118001110301020208000180010