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

BIT (vector, 16B)

Test 1: uops

Code:

  bit v0.16b, v1.16b, v2.16b
  movi v0.16b, 1
  movi v1.16b, 2
  movi v2.16b, 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)map simd uop inputs (81)? int output thing (e9)? simd retires (ee)
1004203310011100010005024810001000300011000
1004203310011100010005024810001000300011000
1004203310011100010005024810001000300011000
1004203310011100010005024810001000300011000
1004203310011100010005024810001000300011000
1004203310011100010005024810001000300011000
1004203310011100010005024810001000300011000
1004203310011100010005024810001000300011000
1004203310011100010005024810001000300011000
1004203310011100010005024810001000300011000

Test 2: Latency 1->1

Code:

  bit v0.16b, v1.16b, v2.16b
  movi v0.16b, 1
  movi v1.16b, 2
  movi v2.16b, 3

(fused SUBS/B.cc loop)

100 unrolls and 100 iterations

Result (median cycles for code): 2.0033

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)map simd uop inputs (81)? int output thing (e9)? simd retires (ee)? int retires (ef)
1020420033101011011000010010000300509248101002001000420030012110000100
1020420033101011011000010010000300509248101002001000420030012110000100
1020420033101011011000010010000300509248101002001000420030012110000100
1020420033101011011000010010000300509248101002001000420030012110000100
1020420033101011011000010010000300509248101002001000420030012110000100
1020420033101011011000010010000300509248101002001000420030012110000100
1020420033101011011000010010000300509248101002001000420030012110000100
1020420033101011011000010010000300509248101002001000420030012110000100
1020420033101011011000010010000300509248101002001000420030012110000100
1020420033101011011000010010000300509248101002001000420030012110000100

1000 unrolls and 10 iterations

Result (median cycles for code): 2.0033

retire uop (01)cycle (02)schedule uop (52)schedule int uop (53)schedule simd uop (54)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 simd uop inputs (81)? int output thing (e9)? simd retires (ee)? int retires (ef)
10024200331002121100002010000070050958010054200100472030018111000010
10024200331002121100002010000070050924810020200100002030000111000010
10024200331002121100002010000070050924810020200100002030144111000010
10024200331002121100002010000070050924810020200100002030000111000010
10024200331002121100002010000070050924810020200100002030000111000010
10024200331002121100002010000070050924810020200100002030000111000010
10024200331002121100002010000070050924810020200100002030012111000010
10024200331002121100002010000070050924810020200100002030012111000010
10024200331002121100002010000070050924810020200100002030000111000010
10024200331002121100002010000070050924810020200100002030000111000010

Test 3: Latency 1->2

Code:

  bit v0.16b, v0.16b, v1.16b
  movi v0.16b, 1
  movi v1.16b, 2

(fused SUBS/B.cc loop)

100 unrolls and 100 iterations

Result (median cycles for code): 2.0033

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)map simd uop inputs (81)? int output thing (e9)? simd retires (ee)? int retires (ef)
1020420033101011011000010010000300509248101002001000620030012110000100
1020420033101011011000010010000300509248101002001000420030012110000100
1020420033101011011000010010000300509248101002001000420030012110000100
1020420033101011011000010010000300509248101002001000420030012110000100
1020420033101011011000010010000300509248101002001000420030012110000100
1020420033101011011000010010000300509248101002001000420030012110000100
1020420033101011011000010010000300509248101002001000420030012110000100
1020420033101011011000010010000300509248101002001000420030012110000100
1020420033101011011000010010000300509248101002001000420030012110000100
1020420033101011011000010010000300509248101002001000420030012110000100

1000 unrolls and 10 iterations

Result (median cycles for code): 2.0033

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)map ldst uop inputs (80)map simd uop inputs (81)? int output thing (e9)? ldst retires (ed)? simd retires (ee)? int retires (ef)
1002420033100212110000201000070509247100202010006200300001101000010
1002420033100212110000201000070509248100202010000200300001101000010
1002420033100212110000201000070509247100202010000200300001101000010
1002420033100212110000201000070509248100202010000200300001101000010
1002420033100212110000201000070509248100202010000200300001101000010
1002420033100212110000201000070509248100202010000200300001101000010
1002420033100212110000201000070509248100202010000200300001101000010
1002420033100212110000201000070509248100202010000200300001101000010
1002420033100212110000201000070509248100202010000200300001101000010
1002420033100212110000201000070509248100202010000200300001101000010

Test 4: Latency 1->3

Code:

  bit v0.16b, v1.16b, v0.16b
  movi v0.16b, 1
  movi v1.16b, 2

(fused SUBS/B.cc loop)

100 unrolls and 100 iterations

Result (median cycles for code): 2.0033

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)map simd uop inputs (81)? int output thing (e9)? simd retires (ee)? int retires (ef)
1020420033101011011000010010000300509248101002001000620030012110000100
1020420033101011011000010010000300509248101002001000420030012110000100
1020420033101011011000010010000300509248101002001000420030012110000100
1020420033101011011000010010000300509248101002001000420030012110000100
1020420033101011011000010010000300509248101002001000420030012110000100
1020420033101011011000010010000300509248101002001000420030012110000100
1020420033101011011000010010000300509248101002001000420030012110000100
1020420033101011011000010010000300509248101002001000420030012110000100
1020420033101011011000010010000300509248101002001000420030012110000100
1020420033101011011000010010000300509248101002001000420030012110000100

1000 unrolls and 10 iterations

Result (median cycles for code): 2.0033

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)map simd uop inputs (81)? int output thing (e9)? simd retires (ee)? int retires (ef)
10024200331002121100002010000705092481002020100002030000111000010
10024200331002121100002010000705092481002020100002030000111000010
10024200331002121100002010000705092481002020100002030000111000010
10024200331002121100002010000705092481002020100002030000111000010
10024200331002121100002010000705092481002020100002030000111000010
10025200661002921100082010034705092481002020100002030000111000010
10024200331002121100002010000705092481002020100002030000111000010
10024200331002121100002010000705092481002020100002030000111000010
10024200331002121100002010000705092481002020100002030000111000010
10024200331002121100002010000705092481002020100002030000111000010

Test 5: throughput

Count: 8

Code:

  movi v0.16b, 0
  bit v0.16b, v8.16b, v9.16b
  movi v1.16b, 0
  bit v1.16b, v8.16b, v9.16b
  movi v2.16b, 0
  bit v2.16b, v8.16b, v9.16b
  movi v3.16b, 0
  bit v3.16b, v8.16b, v9.16b
  movi v4.16b, 0
  bit v4.16b, v8.16b, v9.16b
  movi v5.16b, 0
  bit v5.16b, v8.16b, v9.16b
  movi v6.16b, 0
  bit v6.16b, v8.16b, v9.16b
  movi v7.16b, 0
  bit v7.16b, v8.16b, v9.16b
  movi v8.16b, 9
  movi v9.16b, 10

(fused SUBS/B.cc loop)

100 unrolls and 100 iterations

Result (median cycles for code divided by count): 0.5011

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)map simd uop inputs (81)? int output thing (e9)? simd retires (ee)? int retires (ef)
1602044052980110101800091008001330032005680113200800132002400391160000100
1602044010880110101800091008001330032005680113200800132002400361160000100
1602044008680109101800081008001230032005280112200800122002400361160000100
1602044008680109101800081008001230032005280112200800122002400361160000100
1602054014180144101800431008004930032005280112200800122002400361160000100
1602044008680109101800081008001230032005280112200800122002400361160000100
1602044008680109101800081008001230032005280112200800122002400361160000100
1602044008680109101800081008001230032005280112200800122002400361160000100
1602044008680109101800081008001230032005280112200800122002400361160000100
1602044008680109101800081008001230032005280112200800122002400361160000100

1000 unrolls and 10 iterations

Result (median cycles for code divided by count): 0.5052

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)map simd uop inputs (81)? int output thing (e9)? simd retires (ee)? int retires (ef)
1600244377580019118000810800123032005680023208001320240000116000010
1600244116280011118000010800003032000080010208000020240000116000010
1600244041880011118000010800003032000080010208000020240000116000010
1600244042480011118000010800003032000080010208000020240000116000010
1600244042680011118000010800003032000080010208000020240000116000010
1600244041780011118000010800003032000080010208000020240000116000010
1600244042680011118000010800003032000080010208000020240000116000010
1600244042680011118000010800003032000080010208000020240000116000010
1600244041780011118000010800003032020480060208005020240000116000010
1600244042680011118000010800003032000080010208000020240000116000010

Test 6: throughput

Count: 16

Code:

  bit v0.16b, v16.16b, v17.16b
  bit v1.16b, v16.16b, v17.16b
  bit v2.16b, v16.16b, v17.16b
  bit v3.16b, v16.16b, v17.16b
  bit v4.16b, v16.16b, v17.16b
  bit v5.16b, v16.16b, v17.16b
  bit v6.16b, v16.16b, v17.16b
  bit v7.16b, v16.16b, v17.16b
  bit v8.16b, v16.16b, v17.16b
  bit v9.16b, v16.16b, v17.16b
  bit v10.16b, v16.16b, v17.16b
  bit v11.16b, v16.16b, v17.16b
  bit v12.16b, v16.16b, v17.16b
  bit v13.16b, v16.16b, v17.16b
  bit v14.16b, v16.16b, v17.16b
  bit v15.16b, v16.16b, v17.16b
  movi v16.16b, 17
  movi v17.16b, 18

(fused SUBS/B.cc loop)

100 unrolls and 100 iterations

Result (median cycles for code divided by count): 0.5002

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)map simd uop inputs (81)? int output thing (e9)? simd retires (ee)? int retires (ef)
160204800801601071011600061001600103006400441601102001600142004800421160000100
160204800441601071011600061001600103006400361601082001600122004800361160000100
160204800341601051011600041001600083006400361601082001600122004801831160000100
160204800341601051011600041001600083006400361601082001600122004800361160000100
160204800341601051011600041001600083006400361601082001600122004800361160000100
160204800341601051011600041001600083006400361601082001600122004800361160000100
160204800341601051011600041001600083006400361601082001600122004801801160000100
160204800351601091011600081001600123006400441601102001600142004800421160000100
160204800341601051011600041001600083006400361601082001600122004800361160000100
160204800341601051011600041001600083006400361601082001600122004800361160000100

1000 unrolls and 10 iterations

Result (median cycles for code divided by count): 0.5002

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)map simd uop inputs (81)? int output thing (e9)? simd retires (ee)? int retires (ef)
160024800901600111116000010160000306400001600102016000020480000116000010
160024800371600111116000010160000306400001600102016000020480000116000010
160024800431600111116000010160000306400001600102016000020480000116000010
160024800341600111116000010160000306400001600102016000020480000116000010
160024801101600591116004810160048306401841600562016004620480000116000010
160024800341600111116000010160000306400001600102016000020480282116000010
160024800341600111116000010160000306407641602012016019120480717116000010
160024804891602501116023910160239306400001600102016000020480000116000010
160024800341600111116000010160000306400001600102016000020480000116000010
160024800341600111116000010160000306400001600102016000020480000116000010