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

UADALP (vector, 4S)

Test 1: uops

Code:

  uadalp v0.4s, v1.8h
  movi v0.16b, 1
  movi v1.16b, 2

(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)
1004303310011100010007590510001000200011000
1004303310011100010007590510001000200011000
1004303310011100010007590510001000200011000
1004303310011100010007590510001000200011000
1004303310011100010007590510001000200011000
1004303310011100010007590510001000200011000
1004303310011100010007590510001000200011000
1004303310011100010007590510001000200011000
1004303310011100010007590510001000200011000
1004303310011100010007590510001000200011000

Test 2: Latency 1->1

Code:

  uadalp v0.4s, v1.8h
  movi v0.16b, 1
  movi v1.16b, 2

(fused SUBS/B.cc loop)

100 unrolls and 100 iterations

Result (median cycles for code): 3.0033

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)
102043003310101101100001001000030076890510100200100042000200121010000100
102043003310101101100001001000030076890510100200100042000200081010000100
102043003310101101100001001000030076890510100200100042000200081010000100
102043003310101101100001001000030076890510100200100042000200081010000100
102043003310101101100001001000030076890510100200100042000200081010000100
102043003310101101100001001000030076890510100200100042000200081010000100
102043003310101101100001001000030076890510100200100042000200081010000100
102043003310101101100001001000030076890510100200100042000200081010000100
102043003310101101100001001000030076890510100200100042000200081010000100
102043003310101101100001001000030076890510100200100042000200081010000100

1000 unrolls and 10 iterations

Result (median cycles for code): 3.0033

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)
10024300331002121100002010000707689051002020100062020000111000010
10024300331002121100002010000707689051002020100002020000111000010
10024300331002121100002010000687692471005120100462020000111000010
10024300331002121100002010000707689051002020100002020090111000010
10024300331002121100002010000707689051002020100002020000111000010
10024300331002121100002010000707689051002020100002020000111000010
10024300331002121100002010000707689051002020100002020000111000010
10024300331002121100002010000707689051002020100002020000111000010
10025300661002721100062010031707689051002020100002020000111000010
10024300331002121100002010000707689051002020100002020000111000010

Test 3: Latency 1->2

Code:

  uadalp v0.4s, v0.8h
  movi v0.16b, 1

(fused SUBS/B.cc loop)

100 unrolls and 100 iterations

Result (median cycles for code): 3.0033

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)
1020430033101011011000010010000300768905101002001000420020008110000100
1020430033101011011000010010000300768905101002001000420020008110000100
1020430033101011011000010010000300768905101002001000420020008110000100
1020430033101011011000010010000300768905101002001000420020008110000100
1020430033101011011000010010000300768905101002001000420020008110000100
1020430033101011011000010010000300768905101002001000420020008110000100
1020430033101011011000010010000300768905101002001000420020008110000100
1020430033101011011000010010000300768905101002001000420220090210000100
1020430033101011011000010010000300768905101002001000420020008110000100
1020430033101011011000010010000300768905101002001000420020008110000100

1000 unrolls and 10 iterations

Result (median cycles for code): 3.0033

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)
10024300331002121100002010000707689051002020100042020000111000010
10024300331002121100002010000707689051002020100002020000111000010
10024300331002121100002010000707689051002020100002020000111000010
10024300331002121100002010000707689051002020100002020000111000010
10024300331002121100002010000707689051002020100002020000111000010
10024300331002121100002010000707689051002020100002020000111000010
10024300331002121100002010000707689051002020100002020000111000010
10024300331002121100002010000707689051002020100002020000111000010
10024300331002121100002010000707689051002020100002020000111000010
10024300331002121100002010000707689051002020100002020000111000010

Test 4: throughput

Count: 8

Code:

  movi v0.16b, 0
  uadalp v0.4s, v8.8h
  movi v1.16b, 0
  uadalp v1.4s, v8.8h
  movi v2.16b, 0
  uadalp v2.4s, v8.8h
  movi v3.16b, 0
  uadalp v3.4s, v8.8h
  movi v4.16b, 0
  uadalp v4.4s, v8.8h
  movi v5.16b, 0
  uadalp v5.4s, v8.8h
  movi v6.16b, 0
  uadalp v6.4s, v8.8h
  movi v7.16b, 0
  uadalp v7.4s, v8.8h
  movi v8.16b, 9

(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)
1602044052580110101800091008001330032005280112200800122001600261160000100
1602044012280109101800081008001230032005680113200800132001600241160000100
1602044008680109101800081008001230032005280112200800122001600941160000100
1602044008680109101800081008001230032005680113200800132001600241160000100
1602044008680109101800081008001230032005680113200800132001600261160000100
1602044008680109101800081008001230032005680113200800132001600241160000100
1602044009680110101800091008001330032005680113200800132001600241160000100
1602044008680109101800081008001230032005680113200800132001600241160000100
1602044008680109101800081008001230032005680113200800132001600241160000100
1602054013380146101800451008004930032005280112200800122001600241160000100

1000 unrolls and 10 iterations

Result (median cycles for code divided by count): 0.5054

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)
1600244390680020118000910800133032005280022208001220160000116000010
1600244118080011118000010800003032000080010208000020160000116000010
1600244038780011118000010800003032000080010208000020160000116000010
1600244042880011118000010800003032000080010208000020160000116000010
1600244041980011118000010800003032000080010208000020160000116000010
1600244039780011118000010800003032000080010208000020160000116000010
1600244043580011118000010800003032000080010208000020160000116000010
1600244044480011118000010800003032000080010208000020160000116000010
1600244040880011118000010800003032000080010208000020160000116000010
1600244039380011118000010800003032000080010208000020160000116000010

Test 5: throughput

Count: 16

Code:

  uadalp v0.4s, v16.8h
  uadalp v1.4s, v16.8h
  uadalp v2.4s, v16.8h
  uadalp v3.4s, v16.8h
  uadalp v4.4s, v16.8h
  uadalp v5.4s, v16.8h
  uadalp v6.4s, v16.8h
  uadalp v7.4s, v16.8h
  uadalp v8.4s, v16.8h
  uadalp v9.4s, v16.8h
  uadalp v10.4s, v16.8h
  uadalp v11.4s, v16.8h
  uadalp v12.4s, v16.8h
  uadalp v13.4s, v16.8h
  uadalp v14.4s, v16.8h
  uadalp v15.4s, v16.8h
  movi v16.16b, 17

(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)
160204800651601071011600061001600103006400361601082001600122003200281160000100
160204800351601071011600061001600103006400361601082001600122003200241160000100
160204800351601051011600041001600083006400441601102001600142003203261160000100
160204800371601071011600061001600103006400361601082001600122003200241160000100
160204800351601051011600041001600083006400361601082001600122003200241160000100
160204800351601051011600041001600083006400361601082001600122003200241160000100
160204800351601051011600041001600083006400361601082001600122003200241160000100
160204800351601051011600041001600083006400361601082001600122003200241160000100
160204800351601051011600041001600083006400361601082001600122003200241160000100
160204803341603011011602001001602043006400361601082001600122003200241160000100

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)
160024804091600171116000610160010306400001600102016000020320000116000010
160024800841600111116000010160000306400001600102016000020320000116000010
160024800381600111116000010160000306400001600102016000020320000116000010
160025800751600521116004110160053306400001600102016000020320000116000010
160024800381600111116000010160000306400001600102016000020320000116000010
160024800381600111116000010160000306400001600102016000020320000116000010
160024800381600111116000010160000306400001600102016000020320000116000010
160024800381600111116000010160000306400001600102016000020320000116000010
160024800381600111116000010160000306400001600102016000020320000116000010
160024800381600111116000010160000306400001600102016000020320000116000010