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

FCVTAU (scalar, H to X)

Test 1: uops

Code:

  fcvtau x0, h0
  mov x0, 1
  mov x1, 2

(no loop instructions)

1000 unrolls and 1 iteration

Retires: 2.000

Issues: 3.000

Integer unit issues: 1.001

Load/store unit issues: 0.000

SIMD/FP unit issues: 2.000

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)? int retires (ef)
20041037300110012000200011000200020002000100110001000
20041037300110012000200011000200020002000100110001000
20041037300110012000200011000200020002000100110001000
20041037300110012000200011000200020002000100110001000
20041037300110012000200011000200020002000100110001000
20041037300110012000200011000200020002000100110001000
20041037300110012000200011000200020002000100110001000
20041037300110012000200011000200020002000100110001000
20041037300110012000200011000200020002000100110001000
20041037300110012000200011000200020002000100110001000

Test 2: Latency 1->2 roundtrip

Code:

  fcvtau x0, h0
  fmov d0, x0
  mov x0, 1
  mov x1, 2

(fused SUBS/B.cc loop)

100 unrolls and 100 iterations

Result (median cycles for code): 10.0032

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)
3020410003240101101012000010000100200001000030015481052580312301002001000220004200100012000310001100001000010100
3020410003240101101012000010000100200001000030015467962578206301002001000120003200100012000310001100001000010100
3020410003240101101012000010000100200001000030015467962578206301002001000120003200100192004110002100001000010100
3020410003240101101012000010000100200001000030015467962578206301002001000120003200100012000310001100001000010100
3020410003240101101012000010000100200001000030015467962578206301002001000120003200100012000310001100001000010100
3020410003240101101012000010000100200001000030015467962578206301002001000120003200100012000310001100001000010100
3020410003240101101012000010000100200001000030015467962578206301002001000120003200100012000310001100001000010100
3020410003240101101012000010000100200001000030015467962578206301002001000120003200100012000310001100001000010100
3020410003240101101012000010000100200001001730015481782580425301472001001920041200100012000310001100001000010100
3020410003240101101012000010000100200001000030015467962578206301002001000120003200100012000310001100001000010100

1000 unrolls and 10 iterations

Result (median cycles for code): 10.0032

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)
300241002224002910015200101000410200601003530154819125813503010520100372007520100002000010001100001000010010
300241000324001110011200001000010200001001730154765525803293005520100202003922100192004010003100001000010010
300241000324001110011200001000010200001000030154634625782063001020100002000020100192003710003100001000010010
300241000324001110011200001000010200001000030154634625782063001020100002000020100002000010001100001000010010
300241000324001110011200001000010200001000030154634625782063001020100002000020100002000010001100001000010010
300241001314002010013200051000210200301001730154758425802953005720100172003620100002000010001100001000010010
300241001224002010013200041000310200301000030154634625782063001020100002000020100182003510003100001000010010
300241000324001110011200001000010200001007030154928325831943020020100712014420100172003610003100001000010010
300241000324001110011200001000010200001001730154743025800353005720100172003620100002000010001100001000010010
300241000324001110011200001000010200001001730154747825801133005720100172003620100002000010001100001000010010

Test 3: throughput

Count: 8

Code:

  fcvtau x0, h8
  fcvtau x1, h8
  fcvtau x2, h8
  fcvtau x3, h8
  fcvtau x4, h8
  fcvtau x5, h8
  fcvtau x6, h8
  fcvtau x7, h8
  mov x8, 9

(fused SUBS/B.cc loop)

100 unrolls and 100 iterations

Result (median cycles for code divided by count): 1.0005

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)
16020480057240103801011600020100160008300880041160108200160012200160012800018000080100
16020480046240103801011600020100160008300880041160108200160012200160012800018000080100
16020480037240103801011600020100160008300880041160108200160012200160068800158000080100
16020480037240103801011600020100160008300880041160108200160012200160068800158000080100
16020480037240103801011600020100160008300880041160108200160012200160012800018000080100
16020480037240103801011600020100160008300880041160108200160012200160012800018000080100
16020480037240103801011600020100160008300880041160108200160012200160012800018000080100
16020480037240103801011600020100160008300880041160108200160012200160012800018000080100
16020480037240103801011600020100160008300880041160108200160012200160012800018000080100
16020480037240103801011600020100160008300880041160108200160012200160012800018000080100

1000 unrolls and 10 iterations

Result (median cycles for code divided by count): 1.0005

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)
160024800422400138001116000210160008308800001600102016000020160000800018000080010
160024800372400118001116000010160000308800001600102016000020160068800158000080010
160024800372400118001116000010160000308800001600102016000020160000800018000080010
160024800372400118001116000010160000308800001600102016000020160000800018000080010
160024800372400118001116000010160000308800001600102016000020160000800018000080010
160024800372400118001116000010160000308800001600102016000020160000800018000080010
160024800372400118001116000010160000308800001600102016000020160000800018000080010
160024800372400118001116000010160000308800001600102016000020160000800018000080010
160024800372400118001116000010160000308800001600102016000020160068800158000080010
160024800372400118001116000010160000308800001600102016000020160000800018000080010