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

YIELD

Test 1: uops

Code:

  yield

(no loop instructions)

1000 unrolls and 1 iteration

Retires: 1.000

Issues: 0.000

Integer unit issues: 0.001

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)
1004547111
1004282111
1004275111
1004275111
1004275111
1004275111
1004275111
1004275111
1004275111
1004275111

Test 2: throughput

Code:

  yield

(fused SUBS/B.cc loop)

100 unrolls and 100 iterations

Result (median cycles for code): 0.2585

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)
1020426211011011003001002002001100
1020425851011011003001002002001100
1020425851011011003001002002001100
1020425851011011003001002002001100
1020425851011011003001002002001100
1020425851011011003001002002001100
1020425851011011003001002002001100
1020425851011011003001002002001100
1020425851011011003001002002001100
1020425851011011003001002002001100

1000 unrolls and 10 iterations

Result (median cycles for code): 0.2536

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)
100242772212120652020201110
100242545212120702020201110
100242536212120702020201110
100242536212120702020201110
100242536212120702020201110
100242536212120702020201110
100242536212120702020201110
100242536212120702020201110
100242536212120702020201110
100242536212120702020201110