Icestorm: FCVTAS (scalar, D to X) measurements

Code:

  fcvtas x0, d0

Initialization

  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

Recorded non-zero counters (first 10 of 64 runs)

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)
2004	1037	3001	1001	2000	2000	11000	2000	2000	2000	1001	1000	1000
2004	1037	3001	1001	2000	2000	11000	2000	2000	2000	1001	1000	1000
2004	1037	3001	1001	2000	2000	11000	2000	2000	2000	1001	1000	1000
2004	1037	3001	1001	2000	2000	11000	2000	2000	2000	1001	1000	1000
2004	1037	3001	1001	2000	2000	11000	2000	2000	2000	1001	1000	1000
2004	1037	3001	1001	2000	2000	11000	2000	2000	2000	1001	1000	1000
2004	1037	3001	1001	2000	2000	11000	2000	2000	2000	1001	1000	1000
2004	1037	3001	1001	2000	2000	11000	2000	2000	2000	1001	1000	1000
2004	1037	3001	1001	2000	2000	11000	2000	2000	2000	1001	1000	1000
2004	1037	3001	1001	2000	2000	11000	2000	2000	2000	1001	1000	1000

Test 2: Latency 1->2 roundtrip

Code:

  fcvtas x0, d0
  fmov d0, x0

Initialization

  mov x0, 1
  mov x1, 2

(fused SUBS/B.cc loop)

100 unrolls and 100 iterations

Result (median cycles for code): 10.0032

Recorded non-zero counters (first 10 of 64 runs)

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)
30204	100032	40101	10101	20000	10000	100	20000	10016	300	1546979	2578527	30146	200	10018	20040	200	10002	20004	10001	10000	10000	10100
30204	100032	40101	10101	20000	10000	100	20000	10000	300	1546927	2578414	30100	200	10001	20003	200	10001	20003	10001	10000	10000	10100
30204	100032	40101	10101	20000	10000	100	20000	10000	300	1546796	2578206	30100	200	10001	20003	200	10001	20003	10001	10000	10000	10100
30205	100064	40107	10102	20004	10001	100	20030	10000	300	1546876	2578336	30100	200	10001	20003	200	10001	20003	10001	10000	10000	10100
30204	100032	40101	10101	20000	10000	100	20000	10000	300	1546796	2578206	30100	200	10001	20003	200	10001	20003	10001	10000	10000	10100
30204	100032	40101	10101	20000	10000	100	20000	10000	300	1546796	2578206	30100	200	10001	20003	200	10001	20003	10001	10000	10000	10100
30205	100062	40107	10102	20003	10002	100	20028	10000	300	1546796	2578206	30100	200	10001	20003	200	10001	20003	10001	10000	10000	10100
30204	100032	40101	10101	20000	10000	100	20000	10000	300	1546796	2578206	30100	200	10001	20003	200	10001	20003	10001	10000	10000	10100
30204	100115	40101	10101	20000	10000	100	20000	10000	300	1546912	2578388	30100	200	10001	20003	200	10001	20003	10001	10000	10000	10100
30204	100032	40101	10101	20000	10000	100	20000	10000	300	1546796	2578206	30100	200	10001	20003	200	10001	20003	10001	10000	10000	10100

1000 unrolls and 10 iterations

Result (median cycles for code): 10.0032

Recorded non-zero counters (first 10 of 64 runs)

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)
30024	100034	40011	10011	20000	10000	10	20000	10000	30	1546336	2578206	30010	20	10000	20000	20	10000	20000	10001	10000	10000	10010
30024	100032	40011	10011	20000	10000	10	20000	10000	30	1546346	2578206	30010	20	10000	20000	20	10000	20000	10001	10000	10000	10010
30024	100032	40011	10011	20000	10000	10	20000	10016	30	1547314	2579775	30056	20	10017	20036	20	10000	20000	10001	10000	10000	10010
30024	100032	40011	10011	20000	10000	10	20000	10000	30	1546346	2578206	30010	20	10000	20000	20	10000	20000	10001	10000	10000	10010
30024	100032	40011	10011	20000	10000	10	20000	10000	30	1546346	2578206	30010	20	10000	20000	20	10000	20000	10001	10000	10000	10010
30024	100032	40011	10011	20000	10000	10	20000	10018	30	1546514	2578483	30056	20	10020	20040	20	10000	20000	10001	10000	10000	10010
30024	100032	40011	10011	20000	10000	10	20000	10000	30	1546346	2578206	30010	20	10000	20000	20	10000	20000	10001	10000	10000	10010
30024	100032	40011	10011	20000	10000	10	20000	10000	30	1546346	2578206	30010	20	10000	20000	20	10000	20000	10001	10000	10000	10010
30024	100032	40011	10011	20000	10000	10	20000	10000	30	1546346	2578206	30010	20	10000	20000	20	10000	20000	10001	10000	10000	10010
30024	100032	40011	10011	20000	10000	10	20000	10000	30	1546346	2578206	30010	20	10000	20000	20	10000	20000	10001	10000	10000	10010

Test 3: throughput

Count: 8

Code:

  fcvtas x0, d8
  fcvtas x1, d8
  fcvtas x2, d8
  fcvtas x3, d8
  fcvtas x4, d8
  fcvtas x5, d8
  fcvtas x6, d8
  fcvtas x7, d8

Initialization

  mov x8, 9

(fused SUBS/B.cc loop)

100 unrolls and 100 iterations

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

Recorded non-zero counters (first 10 of 64 runs)

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)
148558	116107	204890	74679	118760	11451	14818	118717	300	880041	160108	200	160012	200	160012	80001	80000	80100
160204	80037	240103	80101	160002	0	100	160008	300	880041	160108	200	160012	200	160012	80001	80000	80100
160204	80037	240103	80101	160002	0	100	160008	300	880041	160108	200	160012	200	160012	80001	80000	80100
160204	80037	240103	80101	160002	0	100	160008	300	880041	160108	200	160012	200	160012	80001	80000	80100
160204	80037	240103	80101	160002	0	100	160008	300	880041	160108	200	160012	200	160012	80001	80000	80100
160204	80037	240103	80101	160002	0	100	160008	300	880041	160108	200	160012	200	160012	80001	80000	80100
160205	80074	240155	80115	160040	0	100	160058	300	880041	160108	200	160012	200	160012	80001	80000	80100
160204	80037	240103	80101	160002	0	100	160008	300	880041	160108	200	160012	200	160012	80001	80000	80100
160204	80037	240103	80101	160002	0	100	160008	300	880041	160108	200	160012	200	160012	80001	80000	80100
160204	80037	240103	80101	160002	0	100	160008	300	880041	160108	200	160012	200	160012	80001	80000	80100

1000 unrolls and 10 iterations

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

Recorded non-zero counters (first 10 of 64 runs)

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)
160024	80061	240014	80011	160003	10	160010	30	880053	160020	20	160014	20	160000	80001	80000	80010
160024	80037	240011	80011	160000	10	160000	30	880000	160010	20	160000	20	160000	80001	80000	80010
160024	80037	240011	80011	160000	10	160000	30	880000	160010	20	160000	20	160000	80001	80000	80010
160024	80037	240011	80011	160000	10	160000	30	880000	160010	20	160000	20	160000	80001	80000	80010
160024	80037	240011	80011	160000	10	160000	30	880000	160010	20	160000	20	160000	80001	80000	80010
160024	80037	240011	80011	160000	10	160000	30	880000	160010	20	160000	20	160000	80001	80000	80010
160024	80037	240011	80011	160000	10	160000	30	880000	160010	20	160000	20	160000	80001	80000	80010
160024	80037	240011	80011	160000	10	160000	30	880000	160010	20	160000	20	160000	80001	80000	80010
160024	80037	240011	80011	160000	10	160000	30	880000	160010	20	160000	20	160000	80001	80000	80010
160024	80037	240011	80011	160000	10	160000	30	880000	160010	20	160000	20	160000	80001	80000	80010

FCVTAS (scalar, D to X)

Test 1: uops

1000 unrolls and 1 iteration

Test 2: Latency 1->2 roundtrip

100 unrolls and 100 iterations

1000 unrolls and 10 iterations

Test 3: throughput

100 unrolls and 100 iterations

1000 unrolls and 10 iterations