Icestorm: STP (Q) measurements

Code:

  stp q0, q1, [x6]
  nop ; nop ; nop ; nop ; nop ; nop ; nop

Initialization

  mov x0, 0

(no loop instructions)

1000 unrolls and 1 iteration

Retires (minus 7 nops): 2.000

Issues: 2.000

Integer unit issues: 0.001

Load/store unit issues: 2.000

SIMD/FP unit issues: 0.000

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

retire uop (01)	cycle (02)	schedule uop (52)	schedule int uop (53)	schedule ldst uop (55)	dispatch ldst uop (58)	simd uops in schedulers (5a)	dispatch uop (78)	map ldst uop (7d)	map ldst uop inputs (80)	? int output thing (e9)	? ldst retires (ed)
9005	4120	2019	1	2018	2000	8511	2000	2000	4000	1	2000
9004	2838	2001	1	2000	2000	8534	2000	2000	4000	1	2000
9004	2322	2001	1	2000	2000	8534	2000	2000	4000	1	2000
9004	2302	2001	1	2000	2000	8534	2000	2000	4000	1	2000
9004	2398	2017	1	2016	2000	8534	2000	2000	4000	1	2000
9004	2301	2001	1	2000	2000	8534	2000	2000	4000	1	2000
9004	2301	2001	1	2000	2000	8534	2000	2000	4000	1	2000
9004	2301	2001	1	2000	2000	8534	2000	2000	4000	1	2000
9004	2301	2001	1	2000	2000	8534	2000	2000	4000	1	2000
9004	2309	2001	1	2000	2000	8534	2000	2000	4000	1	2000

Count: 8

Code:

  stp q0, q1, [x6]
  stp q0, q1, [x6]
  stp q0, q1, [x6]
  stp q0, q1, [x6]
  stp q0, q1, [x6]
  stp q0, q1, [x6]
  stp q0, q1, [x6]
  stp q0, q1, [x6]

Initialization

  mov x7, x6
  mov x8, x6
  mov x9, x6
  mov x10, x6
  mov x11, x6
  mov x12, x6
  mov x13, x6

(fused SUBS/B.cc loop)

100 unrolls and 100 iterations

Result (median cycles for code divided by count): 2.0006

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

retire uop (01)	cycle (02)	schedule uop (52)	schedule int uop (53)	schedule ldst uop (55)	dispatch int uop (56)	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)	? int output thing (e9)	? ldst retires (ed)	? int retires (ef)
160205	160146	160119	101	160018	100	160001	300	2719938	0	160101	200	160008	0	200	320016	1	160000	100
160204	160045	160101	101	160000	100	160001	300	2720010	0	160101	200	160008	0	200	320016	1	160000	100
160204	160045	160101	101	160000	100	160001	300	2720010	0	160101	200	160008	0	200	320016	1	160000	100
160204	160045	160101	101	160000	100	160034	300	2720120	0	160134	200	160048	0	200	320016	1	160000	100
160204	160045	160101	101	160000	100	160001	300	2720010	0	160101	200	160008	0	200	320016	1	160000	100
160204	160045	160101	101	160000	100	160001	300	2720010	0	160101	200	160008	0	200	320016	1	160000	100
160204	160045	160101	101	160000	100	160001	300	2720010	0	160101	200	160008	0	200	320016	1	160000	100
160204	160045	160101	101	160000	100	160001	300	2720010	0	160101	200	160008	0	200	320016	1	160000	100
160204	160045	160101	101	160000	100	160001	300	2720010	0	160101	200	160008	0	200	320016	1	160000	100
160204	160045	160101	101	160000	100	160001	300	2720010	0	160101	200	160008	0	200	320016	1	160000	100

1000 unrolls and 10 iterations

Result (median cycles for code divided by count): 2.0006

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

retire uop (01)	cycle (02)	schedule uop (52)	schedule int uop (53)	schedule ldst uop (55)	dispatch int uop (56)	dispatch ldst uop (58)	int uops in schedulers (59)	simd uops in schedulers (5a)	dispatch uop (78)	map int uop (7c)	map ldst uop (7d)	map int uop inputs (7f)	map ldst uop inputs (80)	? int output thing (e9)	? ldst retires (ed)	? int retires (ef)
160025	160149	160029	11	160018	10	160034	30	2720390	160044	20	160048	20	320016	1	160000	10
160024	160047	160011	11	160000	10	160000	30	2720043	160010	20	160000	20	320000	1	160000	10
160024	160047	160011	11	160000	10	160000	30	2720043	160010	20	160000	20	320000	1	160000	10
160024	160047	160011	11	160000	10	160000	30	2720043	160010	20	160000	20	320080	1	160000	10
160024	160047	160011	11	160000	10	160000	30	2720043	160010	20	160000	20	320096	1	160000	10
160024	160047	160011	11	160000	10	160069	30	2720273	160079	20	160090	20	320016	1	160000	10
160024	160045	160011	11	160000	10	160000	30	2720007	160010	20	160000	20	320000	1	160000	10
160024	160045	160011	11	160000	10	160000	30	2720007	160010	20	160000	20	320000	1	160000	10
160025	160096	160028	11	160017	10	160000	30	2719971	160010	20	160000	20	320100	1	160000	10
160024	160045	160011	11	160000	10	160000	30	2720007	160010	20	160000	20	320000	1	160000	10

STP (Q)

Test 1: uops

1000 unrolls and 1 iteration

Test 2: throughput

100 unrolls and 100 iterations

1000 unrolls and 10 iterations