Icestorm: ST1 (multiple, 1 reg, 16B) measurements

Code:

  st1 { v0.16b }, [x6]
  nop ; nop ; nop ; nop ; nop ; nop ; nop ; nop ; nop ; nop ; nop ; nop ; nop ; nop ; nop ; nop ; nop ; nop ; nop ; nop ; nop ; nop ; nop ; nop ; nop ; nop ; nop ; nop ; nop ; nop ; nop ; nop ; nop ; nop ; nop ; nop ; nop ; nop ; nop ; nop ; nop ; nop ; nop ; nop ; nop ; nop ; nop ; nop ; nop ; nop ; nop ; nop ; nop ; nop ; nop ; nop ; nop ; nop ; nop ; nop

Initialization

  mov x0, 0

(no loop instructions)

1000 unrolls and 1 iteration

Retires (minus 60 nops): 1.000

Issues: 1.000

Integer unit issues: 0.001

Load/store unit issues: 1.000

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)
61005	29336	1003	1	1002	1001	4004	1001	1001	2000	1	1000
61004	29468	1001	1	1000	1000	4000	1000	1000	2000	1	1000
61004	29155	1001	1	1000	1000	4000	1000	1000	2000	1	1000
61004	29183	1001	1	1000	1000	4000	1000	1000	2000	1	1000
61004	29173	1001	1	1000	1000	4000	1000	1000	2000	1	1000
61004	29182	1001	1	1000	1000	4000	1000	1000	2000	1	1000
61004	29194	1001	1	1000	1000	4000	1000	1000	2000	1	1000
61004	29199	1001	1	1000	1000	4000	1000	1000	2000	1	1000
61004	29204	1001	1	1000	1000	4000	1000	1000	2000	1	1000
61004	29164	1001	1	1000	1000	4000	1000	1000	2000	1	1000

Count: 8

Code:

  st1 { v0.16b }, [x6]
  st1 { v0.16b }, [x6]
  st1 { v0.16b }, [x6]
  st1 { v0.16b }, [x6]
  st1 { v0.16b }, [x6]
  st1 { v0.16b }, [x6]
  st1 { v0.16b }, [x6]
  st1 { v0.16b }, [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): 1.0006

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)
80205	80151	80119	101	80018	100	80001	300	1360046	80101	200	80008	200	160016	1	80000	100
80204	80047	80101	101	80000	100	80001	300	1360046	80101	200	80008	200	160016	1	80000	100
80204	80047	80101	101	80000	100	80001	300	1360046	80101	200	80008	200	160016	1	80000	100
80204	80047	80101	101	80000	100	80001	300	1360046	80101	200	80008	200	160016	1	80000	100
80204	80047	80101	101	80000	100	80037	300	1360366	80137	200	80052	200	160016	1	80000	100
80204	80047	80101	101	80000	100	80001	300	1360046	80101	200	80008	200	160016	1	80000	100
80204	80047	80101	101	80000	100	80001	300	1360046	80101	200	80008	200	160016	1	80000	100
80204	80047	80101	101	80000	100	80001	300	1360046	80101	200	80008	200	160016	1	80000	100
80204	80047	80101	101	80000	100	80001	300	1360046	80101	200	80008	200	160016	1	80000	100
80204	80047	80101	101	80000	100	80001	300	1360046	80101	200	80008	200	160016	1	80000	100

1000 unrolls and 10 iterations

Result (median cycles for code divided by count): 1.0006

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)
80026	80177	80046	11	80035	10	80001	30	1360010	80011	20	80008	20	160000	1	80000	10
80024	80047	80011	11	80000	10	80000	30	1360043	80010	20	80000	20	160000	1	80000	10
80024	80047	80011	11	80000	10	80000	30	1360043	80010	20	80000	20	160000	1	80000	10
80024	80047	80011	11	80000	10	80000	30	1360043	80010	20	80000	20	160000	1	80000	10
80024	80047	80011	11	80000	10	80000	30	1360043	80010	20	80000	20	160000	1	80000	10
80024	80047	80011	11	80000	10	80000	30	1360043	80010	20	80000	20	160000	1	80000	10
80024	80047	80011	11	80000	10	80000	30	1360043	80010	20	80000	20	160000	1	80000	10
80024	80056	80011	11	80000	10	80000	30	1360079	80010	20	80000	20	160000	1	80000	10
80024	80047	80011	11	80000	10	80000	30	1360043	80010	20	80000	20	160000	1	80000	10
80024	80047	80011	11	80000	10	80000	30	1360043	80010	20	80000	20	160000	1	80000	10

ST1 (multiple, 1 reg, 16B)

Test 1: uops

1000 unrolls and 1 iteration

Test 2: throughput

100 unrolls and 100 iterations

1000 unrolls and 10 iterations