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

UQXTN2 (2D)

Test 1: uops

Code:

  uqxtn2 v0.4s, v1.2d
  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:

  uqxtn2 v0.4s, v1.2d
  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 simd uop inputs (81)? int output thing (e9)? simd retires (ee)? int retires (ef)
1020430033101011011000010010000300768905101002001000420020012110000100
1020430033101011011000010010000300768905101002001000420020008110000100
1020430033101011011000010010000300768905101002001000420020008110000100
1020430033101011011000010010000300768905101002001000420020008110000100
1020430033101011011000010010000300768905101002001000420020008110000100
1020430033101011011000010010000300768905101002001000420020008110000100
1020430033101011011000010010000300769247101312001004420020008110000100
1020430033101011011000010010000300768905101002001000420020008110000100
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)
10024300331002121100002010000707689051002020100062020000111000010
10024300331002121100002010000707689051002020100002020000111000010
10024300331002121100002010000707689051002020100002020000111000010
10024300331002121100002010000707689051002020100002020000111000010
10024300331002121100002010000707689051002020100002020000111000010
10024300331002121100002010000707689051002020100002020000111000010
10025300661002721100062010031707689051002020100002020000111000010
10024300331002121100002010000707689051002020100002020000111000010
10024300331002121100002010000707689051002020100002020000111000010
10024300331002121100002010000707689051002020100002020000111000010

Test 3: Latency 1->2

Code:

  uqxtn2 v0.4s, v0.2d
  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
1020530066101071011000610010031300768905101002001000420020008110000100
1020430033101011011000010010000300768905101002001000420020008110000100
1020430033101011011000010010000300768905101002001000420020008110000100
1020430033101011011000010010000300768905101002001000420020008110000100
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)
10024300331002121100002010000707689051002020100062020000111000010
10024300331002121100002010000707689051002020100002020000111000010
10024300331002121100002010000707689051002020100002020000111000010
10024300331002121100002010000707689051002020100002020000111000010
10024300331002121100002010000707689051002020100002020000111000010
10024300331002121100002010000707689051002020100002020000111000010
10024300331002121100002010000707689051002020100002020000111000010
10024300331002121100002010000707689051002020100002020000111000010
10024300331002121100002010000707689051002020100002020000111000010
10024300331002121100002010000707689051002020100002020000111000010

Test 4: throughput

Count: 8

Code:

  movi v0.16b, 0
  uqxtn2 v0.4s, v8.2d
  movi v1.16b, 0
  uqxtn2 v1.4s, v8.2d
  movi v2.16b, 0
  uqxtn2 v2.4s, v8.2d
  movi v3.16b, 0
  uqxtn2 v3.4s, v8.2d
  movi v4.16b, 0
  uqxtn2 v4.4s, v8.2d
  movi v5.16b, 0
  uqxtn2 v5.4s, v8.2d
  movi v6.16b, 0
  uqxtn2 v6.4s, v8.2d
  movi v7.16b, 0
  uqxtn2 v7.4s, v8.2d
  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)schedule ldst uop (55)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)
16020440465801101018000901008001330032005280112200800122001600261160000100
16020440110801101018000901008001330032005280112200800122001600241160000100
16020440086801091018000801008001230032005280112200800122001600261160000100
16020440097801091018000801008001230032005280112200800122001600241160000100
16020440086801091018000801008001230032005280112200800122001600241160000100
16020440086801091018000801008001230032005280112200800122001600241160000100
16020440086801091018000801008001230032005280112200800122001600241160000100
16020440086801091018000801008001230032005280112200800122001600241160000100
16020540133801471018004601008005030032005280112200800122001600241160000100
16020440086801091018000801008001230032005280112200800122001600241160000100

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)
1600244408080020118000910800133032005280022208001220160026116000010
1600244134280020118000910800133032020080059208004920160026116000010
1600244042380020118000910800133032005680023208001320160026116000010
1600244036980020118000910800133032005680023208001320160026116000010
1600244042980020118000910800133032005680023208001320160026116000010
1600244043780020118000910800133032005680023208001320160026116000010
1600244044680020118000910800133032005680023208001320160026116000010
1600244043780020118000910800133032005280022208001220160024116000010
1600244041980020118000910800133032005680023208001320160026116000010
1600244036480020118000910800133032005680023208001320160026116000010

Test 5: throughput

Count: 16

Code:

  uqxtn2 v0.4s, v16.2d
  uqxtn2 v1.4s, v16.2d
  uqxtn2 v2.4s, v16.2d
  uqxtn2 v3.4s, v16.2d
  uqxtn2 v4.4s, v16.2d
  uqxtn2 v5.4s, v16.2d
  uqxtn2 v6.4s, v16.2d
  uqxtn2 v7.4s, v16.2d
  uqxtn2 v8.4s, v16.2d
  uqxtn2 v9.4s, v16.2d
  uqxtn2 v10.4s, v16.2d
  uqxtn2 v11.4s, v16.2d
  uqxtn2 v12.4s, v16.2d
  uqxtn2 v13.4s, v16.2d
  uqxtn2 v14.4s, v16.2d
  uqxtn2 v15.4s, v16.2d
  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)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 simd uop inputs (81)? int output thing (e9)? simd retires (ee)? int retires (ef)
1602048005816010710116000601001600100300064003616010820001600122003200241160000100
1602048004516010510116000401001600080300064003616010820001600122003200241160000100
1602058007016014310116004201001600540300064003616010820001600122003200241160000100
1602048003516010510116000401001600080300064003616010820001600122003200241160000100
1602048003516010510116000401001600080300064003616010820001600122003201281160000100
1602048003516010710116000601001600100300064003616010820001600122003200241160000100
1602048003516010510116000401001600080300064003616010820001600122003200241160000100
1602048003516010510116000401001600080300064003616010820001600122003200241160000100
1602048003516010510116000401001600080300064020816015420001600642003200281160000100
1602048003516010510116000401001600080300064004416011020001600142003200241160000100

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)schedule ldst uop (55)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)
1600258017816005311160042010160054306400361600182016001220320028116000010
1600248003516001711160006010160010306400441600202016001420320028116000010
1600248003516001711160006010160010306400441600202016001420320028116000010
1600248003516001711160006010160010306400441600202016001420320028116000010
1600248003516001711160006010160010306400441600202016001420320028116000010
1600248004016001111160000010160000306400001600102016000020320000116000010
1600248003516001111160000010160000306400001600102016000020320126116000010
1600248003516001111160000010160000306400001600102016000020320000116000010
1600248003516001111160000010160000306400001600102016000020320000116000010
1600248003516001111160000010160000306400001600102016000020320000116000010