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

STR (unsigned offset, 64-bit)

Test 1: uops

Code:

  str x0, [x6, #8]
  mov x0, 0

(no loop instructions)

1000 unrolls and 1 iteration

Retires: 1.000

Issues: 1.000

Integer unit issues: 0.001

Load/store unit issues: 1.000

SIMD/FP unit issues: 0.000

retire uop (01)cycle (02)schedule uop (52)schedule int uop (53)schedule ldst uop (55)dispatch ldst uop (58)simd uops in schedulers (5a)dispatch uop (78)map ldst uop (7d)map ldst uop inputs (80)? int output thing (e9)? ldst retires (ed)
1005115610191101810001688310001000200011000
1004103910011100010001688310001000200011000
1004103910011100010001688310001000200011000
1004103910011100010001688310001000200011000
1004103910011100010001688310001000200011000
1004103910011100010001688310001000200011000
1004103910011100010001688310001000200011000
1004103910011100010001688310001000200011000
1004103910011100010001688310001000200011000
1004103910011100010001688310001000200011000

Test 2: throughput

Count: 8

Code:

  str x0, [x6, #8]
  str x0, [x6, #8]
  str x0, [x6, #8]
  str x0, [x6, #8]
  str x0, [x6, #8]
  str x0, [x6, #8]
  str x0, [x6, #8]
  str x0, [x6, #8]
  mov x7, x6
  mov x8, x6
  mov x9, x6
  mov x10, x6
  mov x11, x6
  mov x12, x6
  mov x13, x6

(fused SUBS/B.cc loop)

100 unrolls and 100 iterations

Result (median cycles for code divided by count): 1.0006

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)dispatch ldst uop (58)int uops in schedulers (59)simd uops in schedulers (5a)ldst uops in schedulers (5b)dispatch uop (78)map int uop (7c)map ldst uop (7d)map simd uop (7e)map int uop inputs (7f)map ldst uop inputs (80)? int output thing (e9)? ldst retires (ed)? int retires (ef)
8020580154801191010800181000800013001359974080101200800080200160016180000100
8020480047801011010800001000800013001360046080101200800080200160016180000100
8020480047801011010800001000800373001360562080137200800520200160016180000100
8020480050801011010800001000800013001360046080101200800080200160016180000100
8020480047801011010800001000800013001360046080101200800080200160016180000100
8020480047801011010800001000800373001360168080137200800520200160016180000100
8020480047801011010800001000800013001360046080101200800080200160016180000100
8020480047801011010800001000800013001360046080101200800080200160016180000100
8020480047801011010800001000800013001360046080101200800080200160016180000100
8020480047801011010800001000800013001360046080101200800080200160016180000100

1000 unrolls and 10 iterations

Result (median cycles for code divided by count): 1.0006

retire uop (01)cycle (02)schedule uop (52)schedule int uop (53)schedule ldst uop (55)dispatch int uop (56)dispatch ldst uop (58)int uops in schedulers (59)simd uops in schedulers (5a)dispatch uop (78)map int uop (7c)map ldst uop (7d)map int uop inputs (7f)map ldst uop inputs (80)? int output thing (e9)? ldst retires (ed)? simd retires (ee)? int retires (ef)
8002580148800291180018108000130136001080011208000820160016180000010
8002480047800111180000108000030136004380010208000020160000180000010
8002480047800111180000108000030136004380010208000020160000180000010
8002480047800111180000108003730136031080047208005220160000180000010
8002480047800111180000108000030136004380010208000020160000180000010
8002480047800111180000108000030136004380010208000020160000180000010
8002480047800111180000108000030136004380010208000020160000180000010
8002480047800111180000108000030136004380010208000020160000180000010
8002480047800111180000108000030136004380010208000020160000180000010
8002480047800111180000108000030136004380010208000020160000180000010