Icestorm: LD1 (multiple, post-index, 4 regs, 8B) measurements

Code:

  ld1 { v0.8b, v1.8b, v2.8b, v3.8b }, [x6], x8
  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, 1
  mov x1, 2
  mov x8, 0

(no loop instructions)

1000 unrolls and 1 iteration

Retires (minus 60 nops): 4.000

Issues: 5.000

Integer unit issues: 1.001

Load/store unit issues: 4.000

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 int uop (56)	dispatch ldst uop (58)	int uops in schedulers (59)	simd uops in schedulers (5a)	dispatch uop (78)	map ldst uop (7d)	map ldst uop inputs (80)	? int output thing (e9)	? ldst retires (ed)
64005	29957	5011	1003	4008	1002	4000	3000	12000	5000	4000	5000	1001	4000
64004	29499	5001	1001	4000	1000	4000	3000	12000	5000	4000	5000	1001	4000
64004	29415	5001	1001	4000	1000	4000	3000	12000	5000	4000	5000	1001	4000
64004	29424	5001	1001	4000	1000	4000	3000	12000	5000	4000	5000	1001	4000
64004	29424	5001	1001	4000	1000	4000	3000	12000	5000	4000	5000	1001	4000
64005	29448	5006	1002	4004	1001	4000	3000	12000	5000	4000	5000	1001	4000
64004	29424	5001	1001	4000	1000	4000	3000	12000	5000	4000	5000	1001	4000
64004	29425	5001	1001	4000	1000	4000	3000	12000	5000	4000	5000	1001	4000
64004	29416	5001	1001	4000	1000	4000	3000	12000	5000	4000	5000	1001	4000
64004	29423	5001	1001	4000	1000	4000	3000	12000	5000	4000	5000	1001	4000

Count: 8

Code:

  ld1 { v0.8b, v1.8b, v2.8b, v3.8b }, [x6], x8
  ld1 { v0.8b, v1.8b, v2.8b, v3.8b }, [x6], x8
  ld1 { v0.8b, v1.8b, v2.8b, v3.8b }, [x6], x8
  ld1 { v0.8b, v1.8b, v2.8b, v3.8b }, [x6], x8
  ld1 { v0.8b, v1.8b, v2.8b, v3.8b }, [x6], x8
  ld1 { v0.8b, v1.8b, v2.8b, v3.8b }, [x6], x8
  ld1 { v0.8b, v1.8b, v2.8b, v3.8b }, [x6], x8
  ld1 { v0.8b, v1.8b, v2.8b, v3.8b }, [x6], x8

Initialization

  mov x7, x6
  mov x8, x6
  mov x9, x6
  mov x10, x6
  mov x11, x6
  mov x12, x6
  mov x13, x6
  mov x8, 0

(fused SUBS/B.cc loop)

100 unrolls and 100 iterations

Result (median cycles for code divided by count): 2.0007

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)
320205	160155	400152	80116	320036	80116	320010	240309	976194	400113	200	320016	200	400020	80003	320000	100
320205	160107	400152	80116	320036	80116	320010	240309	1360194	400113	200	320016	200	400020	80003	320000	100
320204	160055	400103	80103	320000	80103	320010	240309	2560206	400113	200	320016	200	400020	80003	320000	100
320204	160055	400103	80103	320000	80103	320010	240309	2560206	400113	200	320016	200	400020	80003	320000	100
320204	160055	400103	80103	320000	80103	320010	240309	2560206	400113	200	320016	200	400090	80016	320000	100
320204	160134	400103	80103	320000	80103	320010	240309	2560260	400113	200	320016	200	400020	80003	320000	100
320204	160055	400103	80103	320000	80103	320010	240309	2560206	400113	200	320016	200	400300	80055	320000	100
320204	160060	400103	80103	320000	80103	320010	240309	2560206	400113	200	320016	200	400020	80003	320000	100
320204	160052	400103	80103	320000	80103	320058	240348	2137910	400174	200	320072	200	400020	80003	320000	100
320204	160055	400103	80103	320000	80103	320010	240309	2560206	400113	200	320016	200	400020	80003	320000	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)
320025	160587	400056	80026	320030	80026	320000	240030	2560164	400010	20	320000	20	400000	80001	320000	10
320024	160051	400011	80011	320000	80010	320000	240030	2560164	400010	20	320000	20	400000	80001	320000	10
320024	160051	400011	80011	320000	80010	320000	240030	2560164	400010	20	320000	20	400000	80001	320000	10
320024	160051	400011	80011	320000	80010	320058	240078	2337858	400084	20	320072	20	400000	80001	320000	10
320024	160051	400011	80011	320000	80010	320000	240030	2560164	400010	20	320000	20	400000	80001	320000	10
320024	160051	400011	80011	320000	80010	320000	240030	2560164	400010	20	320000	20	400000	80001	320000	10
320024	160051	400011	80011	320000	80010	320000	240030	2560164	400010	20	320000	20	400000	80001	320000	10
320025	160109	400058	80026	320032	80026	320000	240030	2560164	400010	20	320000	20	400000	80001	320000	10
320024	160051	400011	80011	320000	80010	320000	240030	2560164	400010	20	320000	20	400000	80001	320000	10
320024	160051	400011	80011	320000	80010	320000	240030	2560164	400010	20	320000	20	400000	80001	320000	10

LD1 (multiple, post-index, 4 regs, 8B)

Test 1: uops

1000 unrolls and 1 iteration

Test 2: throughput

100 unrolls and 100 iterations

1000 unrolls and 10 iterations