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

SRSRA (vector, 2D)

Test 1: uops

Code:

  srsra v0.2d, v1.2d, #3
  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:

  srsra v0.2d, v1.2d, #3
  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)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)
10204300331010110110000010010000300768905101002001000620020008110000100
10204300331010110110000010010000300768905101002001000420220092210000100
10204300331010110110000010010000300768905101002001000420020008110000100
10204300331010110110000010010000300768905101002001000420020008110000100
10204300331010110110000010010000300768905101002001000420020008110000100
10204300331010110110000010010000300768905101002001000420020008110000100
10204300331010110110000010010000300768905101002001000420020008110000100
10204300331010110110000010010000300768905101002001000420020008110000100
10204300331010110110000010010000300768905101002001000420020008110000100
10204300331010110110000010010000300768905101002001000420020008110000100

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)
10024300331002121100002010000707689051002020100002020000111000010
10024300331002121100002010000707689051002020100002020000111000010
10024300331002121100002010000707689051002020100002020000111000010
10024300331002121100002010000707689051002020100002020000111000010
10024300331002121100002010000707689051002020100002020000111000010
10024300331002121100002010000707689051002020100002020000111000010
10024300331002121100002010000707689051002020100002020000111000010
10024300331002121100002010000707689051002020100002020000111000010
10024300331002121100002010000707689051002020100002020000111000010
10024300331002121100002010000707689051002020100002020000111000010

Test 3: Latency 1->2

Code:

  srsra v0.2d, v0.2d, #3
  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
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)
10024300331002121100002010000707689051002020100042020000111000010
10024300331002121100002010000707689051002020100002020000111000010
10024300331002121100002010000707689051002020100002020000111000010
10024300331002121100002010000707689051002020100002020000111000010
10024300331002121100002010000707689051002020100002020000111000010
10024300331002121100002010000707689051002020100002020000111000010
10024300331002121100002010000707689051002020100002020000111000010
10024300331002121100002010000707689051002020100002020000111000010
10024300331002121100002010000707689051002020100002020000111000010
10024300331002121100002010000707689051002020100002020000111000010

Test 4: throughput

Count: 8

Code:

  movi v0.16b, 0
  srsra v0.2d, v8.2d, #3
  movi v1.16b, 0
  srsra v1.2d, v8.2d, #3
  movi v2.16b, 0
  srsra v2.2d, v8.2d, #3
  movi v3.16b, 0
  srsra v3.2d, v8.2d, #3
  movi v4.16b, 0
  srsra v4.2d, v8.2d, #3
  movi v5.16b, 0
  srsra v5.2d, v8.2d, #3
  movi v6.16b, 0
  srsra v6.2d, v8.2d, #3
  movi v7.16b, 0
  srsra v7.2d, v8.2d, #3
  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)
1602044048080109101800081008001230032005280112200800122001600261160000100
1602044011780110101800091008001330032005280112200800122001600981160000100
1602044009780109101800081008001230032005280112200800122001600241160000100
1602044008680109101800081008001230032005280112200800122001600241160000100
1602044008680109101800081008001230032005280112200800122001600241160000100
1602044008680109101800081008001230032005280112200800122001600241160000100
1602044008680109101800081008001230032005280112200800122001600241160000100
1602044008680109101800081008001230032005280112200800122001600241160000100
1602044008680109101800081008001230032005280112200800122001600241160000100
1602044008680109101800081008001230032005280112200800122001600241160000100

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)
1600244391280019118000810800123032005680023208001320160000116000010
1600244123480011118000010800003032000080010208000020160000116000010
1600244042180011118000010800003032000080010208000020160000116000010
1600244042780011118000010800003032000080010208000020160000116000010
1600244043380011118000010800003032000080010208000020160000116000010
1600244041180011118000010800003032000080010208000020160000116000010
1600244041680011118000010800003032000080010208000020160000116000010
1600244041380011118000010800003032000080010208000020160000116000010
1600244041280011118000010800003032000080010208000020160000116000010
1600244039380011118000010800003032000080010208000020160000116000010

Test 5: throughput

Count: 16

Code:

  srsra v0.2d, v16.2d, #3
  srsra v1.2d, v16.2d, #3
  srsra v2.2d, v16.2d, #3
  srsra v3.2d, v16.2d, #3
  srsra v4.2d, v16.2d, #3
  srsra v5.2d, v16.2d, #3
  srsra v6.2d, v16.2d, #3
  srsra v7.2d, v16.2d, #3
  srsra v8.2d, v16.2d, #3
  srsra v9.2d, v16.2d, #3
  srsra v10.2d, v16.2d, #3
  srsra v11.2d, v16.2d, #3
  srsra v12.2d, v16.2d, #3
  srsra v13.2d, v16.2d, #3
  srsra v14.2d, v16.2d, #3
  srsra v15.2d, v16.2d, #3
  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 ldst uop inputs (80)map simd uop inputs (81)? int output thing (e9)? ldst retires (ed)? simd retires (ee)? int retires (ef)
160204800461601071011600060100160010030006408361603082000160212200032002810160000100
160204800351601071011600060100160010030006400361601082000160012200032002410160000100
160204803311602981011601970100160201030006400361601082000160012200032002410160000100
160204800351601051011600040100160008030006400361601082000160012200032002410160000100
160204800351601051011600040100160008030006400441601102000160014200032002410160000100
160204800351601051011600040100160008030006402081601542000160062200032002410160000100
160204800351601051011600040100160008030006400361601082000160012200032002410160000100
160204800351601071011600060100160010030006400361601082000160012200032002410160000100
160204800351601051011600040100160008030006400361601082000160012200032002410160000100
160204800351601051011600040100160008030006402321601572000160061200032042210160000100

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)
16002480132160027211600060201600107064004416003020160016203200001116000010
16002480040160021211600000201600007064000016002020160000203200001116000010
16002480035160021211600000201600007064000016002020160000203200001116000010
16002480035160021211600000201600007064000016002020160000203200001116000010
16002480035160021211600000201600007064000016002020160000203200001116000010
16002480035160021211600000201600007064000016002020160000203200001116000010
16002480035160021211600000201600007064000016002020160000203200001116000010
16002480035160021211600000201600007064021616007620160065203200001116000010
16002480035160021211600000201600007064000016002020160000203200001116000010
16002480035160021211600000201600007064000016002020160000203200001116000010