Icestorm: SUBS (immediate, 32-bit) measurements

Code:

  subs w0, w0, #3

Initialization

  mov x0, 1
  mov x1, 2

(no loop instructions)

1000 unrolls and 1 iteration

Retires: 1.000

Issues: 1.000

Integer unit issues: 1.001

Load/store unit issues: 0.000

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)	dispatch int uop (56)	int uops in schedulers (59)	dispatch uop (78)	map int uop (7c)	map int uop inputs (7f)	? int output thing (e9)	? int retires (ef)
1004	1030	1001	1001	1000	25043	1000	1000	1000	1001	1000
1004	1030	1001	1001	1000	25043	1000	1000	1000	1001	1000
1004	1030	1001	1001	1000	25043	1000	1000	1000	1001	1000
1004	1030	1001	1001	1000	25043	1000	1000	1000	1001	1000
1004	1030	1001	1001	1000	25043	1000	1000	1000	1001	1000
1004	1030	1001	1001	1000	25043	1000	1000	1000	1001	1000
1004	1030	1001	1001	1000	25043	1000	1000	1000	1001	1000
1004	1030	1001	1001	1000	25043	1000	1000	1000	1001	1000
1004	1030	1001	1001	1000	25043	1000	1000	1000	1001	1000
1004	1030	1001	1001	1000	25043	1000	1000	1000	1001	1000

Test 2: Latency 1->2

Code:

  subs w0, w0, #3

Initialization

  mov x0, 1
  mov x1, 2

(fused SUBS/B.cc loop)

100 unrolls and 100 iterations

Result (median cycles for code): 1.0030

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

retire uop (01)	cycle (02)	schedule uop (52)	schedule int uop (53)	dispatch int uop (56)	int uops in schedulers (59)	dispatch uop (78)	map int uop (7c)	map int uop inputs (7f)	? int output thing (e9)	? int retires (ef)
10204	10030	10101	10101	10109	251641	10106	10206	10210	10001	10100
10204	10030	10101	10101	10108	251774	10108	10208	10208	10001	10100
10204	10030	10101	10101	10108	251774	10108	10208	10208	10001	10100
10204	10030	10101	10101	10108	251774	10108	10208	10208	10001	10100
10204	10030	10101	10101	10108	251774	10108	10208	10208	10001	10100
10204	10030	10101	10101	10108	251774	10108	10208	10208	10001	10100
10204	10030	10101	10101	10108	251774	10108	10208	10208	10001	10100
10204	10030	10101	10101	10108	251774	10108	10208	10208	10001	10100
10204	10030	10101	10101	10108	251774	10108	10208	10208	10001	10100
10204	10030	10101	10101	10108	251774	10108	10208	10208	10001	10100

1000 unrolls and 10 iterations

Result (median cycles for code): 1.0030

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

retire uop (01)	cycle (02)	schedule uop (52)	schedule int uop (53)	dispatch int uop (56)	int uops in schedulers (59)	dispatch uop (78)	map int uop (7c)	map int uop inputs (7f)	? int output thing (e9)	? int retires (ef)
10024	10030	10021	10021	10029	253161	10020	10020	10020	10011	10010
10024	10030	10021	10021	10020	253161	10020	10020	10020	10011	10010
10024	10030	10021	10021	10020	253161	10020	10020	10020	10011	10010
10024	10030	10021	10021	10020	253161	10020	10020	10020	10011	10010
10024	10030	10021	10021	10020	253161	10020	10020	10020	10011	10010
10024	10030	10021	10021	10020	253161	10020	10020	10020	10011	10010
10024	10030	10021	10021	10020	253161	10020	10020	10020	10011	10010
10024	10030	10021	10021	10020	253161	10020	10020	10020	10011	10010
10024	10030	10021	10021	10020	253161	10020	10020	10020	10011	10010
10024	10030	10021	10021	10020	253161	10020	10020	10020	10011	10010

Test 3: Latency 3->2

Chain cycles: 1

Code:

  subs w0, w1, #3
  cset x1, cc

Initialization

  mov x0, 1
  mov x1, 2
  mov x2, 3
  mov x3, 4
  mov x4, 5

(fused SUBS/B.cc loop)

100 unrolls and 100 iterations

Result (median cycles for code, minus 1 chain cycle): 1.0030

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

retire uop (01)	cycle (02)	schedule uop (52)	schedule int uop (53)	dispatch int uop (56)	int uops in schedulers (59)	dispatch uop (78)	map int uop (7c)	map int uop inputs (7f)	? int output thing (e9)	? int retires (ef)
20204	20030	20101	20101	20108	519413	20107	20214	20216	20001	20100
20204	20030	20101	20101	20107	519548	20108	20216	20216	20001	20100
20204	20030	20101	20101	20108	519548	20108	20216	20216	20001	20100
20204	20030	20101	20101	20108	519548	20108	20216	20216	20001	20100
20204	20030	20101	20101	20108	519548	20108	20216	20214	20001	20100
20204	20030	20101	20101	20108	519434	20107	20214	20216	20001	20100
20204	20030	20101	20101	20108	519548	20108	20216	20216	20001	20100
20204	20030	20101	20101	20108	519548	20108	20216	20216	20001	20100
20204	20030	20101	20101	20108	519548	20108	20216	20216	20001	20100
20204	20030	20101	20101	20108	519548	20108	20216	20216	20001	20100

1000 unrolls and 10 iterations

Result (median cycles for code, minus 1 chain cycle): 1.0030

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

retire uop (01)	cycle (02)	schedule uop (52)	schedule int uop (53)	dispatch int uop (56)	int uops in schedulers (59)	dispatch uop (78)	map int uop (7c)	map int uop inputs (7f)	? int output thing (e9)	? int retires (ef)
20024	20030	20011	20011	20018	519454	20010	20020	20020	20001	20010
20024	20030	20011	20011	20010	519598	20010	20020	20020	20001	20010
20024	20030	20011	20011	20010	519598	20010	20020	20020	20001	20010
20024	20030	20011	20011	20010	519598	20010	20020	20020	20001	20010
20024	20030	20011	20011	20010	519598	20010	20020	20020	20001	20010
20024	20030	20011	20011	20010	519598	20010	20020	20020	20001	20010
20024	20030	20011	20011	20010	519598	20010	20020	20020	20001	20010
20024	20030	20011	20011	20010	519598	20010	20020	20020	20001	20010
20024	20030	20011	20011	20010	519598	20010	20020	20020	20001	20010
20024	20030	20011	20011	20010	519598	20010	20020	20020	20001	20010

Test 4: throughput

Count: 8

Code:

  subs w0, w8, #3
  subs w1, w8, #3
  subs w2, w8, #3
  subs w3, w8, #3
  subs w4, w8, #3
  subs w5, w8, #3
  subs w6, w8, #3
  subs w7, w8, #3

Initialization

  mov x8, 9
  mov x9, 10
  mov x10, 11

(fused SUBS/B.cc loop)

100 unrolls and 100 iterations

Result (median cycles for code divided by count): 0.5010

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

retire uop (01)	cycle (02)	schedule uop (52)	schedule int uop (53)	dispatch int uop (56)	int uops in schedulers (59)	dispatch uop (78)	map int uop (7c)	map int uop inputs (7f)	? int output thing (e9)	? int retires (ef)
80204	40093	80112	80112	80115	240345	80115	80216	80216	80012	80100
80204	40081	80112	80112	80115	240345	80115	80216	80216	80012	80100
80204	40081	80112	80112	80115	240345	80115	80216	80216	80012	80100
80204	40081	80112	80112	80115	240345	80115	80216	80216	80012	80100
80204	40081	80112	80112	80115	240345	80115	80216	80216	80012	80100
80204	40081	80112	80112	80115	240345	80115	80216	80216	80012	80100
80205	40106	80143	80143	80151	240345	80115	80216	80216	80012	80100
80204	40081	80112	80112	80115	240442	80149	80250	80216	80012	80100
80204	40081	80112	80112	80115	240345	80115	80216	80216	80012	80100
80204	40081	80112	80112	80115	240345	80115	80216	80216	80012	80100

1000 unrolls and 10 iterations

Result (median cycles for code divided by count): 0.5004

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

retire uop (01)	cycle (02)	schedule uop (52)	schedule int uop (53)	dispatch int uop (56)	int uops in schedulers (59)	dispatch uop (78)	map int uop (7c)	map int uop inputs (7f)	map ldst uop inputs (80)	? int output thing (e9)	? ldst retires (ed)	? simd retires (ee)	? int retires (ef)
80024	40197	80034	80034	80037	240065	80020	80020	80020	0	80011	0	0	80010
80024	40030	80021	80021	80020	240065	80020	80020	80020	0	80011	0	0	80010
80024	40030	80021	80021	80020	240067	80020	80020	80020	0	80011	0	0	80010
80024	40030	80021	80021	80020	240065	80020	80020	80020	0	80011	0	0	80010
80024	40030	80021	80021	80020	240065	80020	80020	80020	0	80011	0	0	80010
80024	40030	80021	80021	80020	240065	80020	80020	80020	0	80011	0	0	80010
80024	40030	80021	80021	80020	240065	80020	80020	80020	0	80011	0	0	80010
80024	40030	80021	80021	80020	240065	80020	80020	80020	0	80011	0	0	80010
80024	40030	80021	80021	80020	240065	80020	80020	80020	0	80011	0	0	80010
80024	40030	80021	80021	80020	240206	80067	80067	80020	0	80011	0	0	80010

SUBS (immediate, 32-bit)

Test 1: uops

1000 unrolls and 1 iteration

Test 2: Latency 1->2

100 unrolls and 100 iterations

1000 unrolls and 10 iterations

Test 3: Latency 3->2

100 unrolls and 100 iterations

1000 unrolls and 10 iterations

Test 4: throughput

100 unrolls and 100 iterations

1000 unrolls and 10 iterations