OV - exec - Function field_summary(global_variables&, parallel_&) [clone ._omp

	Function: field_summary(global_variables&, parallel_&) [clone ._omp_fn.0]	Module: exec	Source: field_summary.cpp:75-91 [...]	Coverage (incl. loops): 0.34% \| (excl. loops): 0.00%

/home/eoseret/qaas/qaas_runs/178-219-7589/intel/CloverLeaf2.0-CXX/build/CloverLeaf2.0-CXX/src/omp/context.h: 69 - 69

--------------------------------------------------------------------------------

69:   T &operator()(size_t i, size_t j) const { return data[i + j * sizeX]; }

/home/eoseret/qaas/qaas_runs/178-219-7589/intel/CloverLeaf2.0-CXX/build/CloverLeaf2.0-CXX/src/omp/field_summary.cpp: 75 - 91

--------------------------------------------------------------------------------

75: #pragma omp parallel for simd reduction(+ : press) reduction(+ : ke) reduction(+ : ie) reduction(+ : mass) reduction(+ : vol)

76:     for (int idx = (0); idx < ((ymax - ymin + 1) * (xmax - xmin + 1)); idx++) {

77:       const int j = xmin + 1 + idx % (xmax - xmin + 1);

78:       const int k = ymin + 1 + idx / (xmax - xmin + 1);

79:       double vsqrd = 0.0;

80:       for (int kv = k; kv <= k + 1; ++kv) {

81:         for (int jv = j; jv <= j + 1; ++jv) {

82:           vsqrd += 0.25 * (field.xvel0(jv, kv) * field.xvel0(jv, kv) + field.yvel0(jv, kv) * field.yvel0(jv, kv));

83:         }

84:       }

85:       double cell_vol = field.volume(j, k);

86:       double cell_mass = cell_vol * field.density0(j, k);

87:       vol += cell_vol;

88:       mass += cell_mass;

89:       ie += cell_mass * field.energy0(j, k);

90:       ke += cell_mass * 0.5 * vsqrd;

91:       press += cell_vol * field.pressure(j, k);

0x4353e0 STP	X29, X30, [SP, #896]!

0x4353e4 ADD	X29, SP, #0

0x4353e8 STP	X19, X20, [SP, #16]

0x4353ec ORR	X19, XZR, X0

0x4353f0 STP	X21, X22, [SP, #32]

0x4353f4 STP	X23, X24, [SP, #48]

0x4353f8 LDP	W21, W24, [X0, #48]

0x4353fc LDR	W23, [X19, #60]

0x435400 LDR	W0, [X0, #56]

0x435404 SUB	W1, W21, W24

0x435408 STR	D15, [SP, #88]

0x43540c ADD	W2, W1, #1

0x435410 SUB	W3, W0, W23

0x435414 ADD	W20, W3, #1

0x435418 MADD	W21, W3, W2, W2

0x43541c BL	410210

0x435420 ORR	W22, WZR, W0

0x435424 BL	410240

0x435428 SDIV	W4, W21, W22

0x43542c MSUB	W5, W4, W22, W21

0x435430 CMP	W0, W5

0x435434 B.LT	4355f8

0x435438 MADD	W5, W4, W0, W5

0x43543c ADD	W0, W4, W5

0x435440 CMP	W5, W0

0x435444 B.GE	4355a4

0x435448 MOVI	D22, #0

0x43544c STP	X25, X26, [SP, #64]

0x435450 FMOV	D19, #0.1250000

0x435454 ADD	W12, W23, #1

0x435458 ADD	W13, W24, #1

0x43545c LDR	X6, [X19]

0x435460 FMOV	D20, D22

0x435464 FMOV	D23, D22

0x435468 FMOV	D21, D22

0x43546c FMOV	D15, D22

0x435470 LDR	X22, [X6]

0x435474 LDR	X21, [X6, #16]

0x435478 LDR	X30, [X6, #48]

0x43547c LDR	X18, [X6, #64]

0x435480 LDR	X17, [X6, #96]

0x435484 LDR	X16, [X6, #112]

0x435488 LDR	X11, [X6, #168]

0x43548c LDR	X9, [X6, #184]

0x435490 LDR	X10, [X6, #216]

0x435494 LDR	X8, [X6, #232]

0x435498 LDR	X15, [X6, #656]

0x43549c LDR	X14, [X6, #672]

0x4354a0 STR	X27, [SP, #80]

(232) 0x4354a4 SDIV	W7, W5, W20

(232) 0x4354a8 ADD	W25, W7, W13

(232) 0x4354ac MSUB	W26, W7, W20, W5

(232) 0x4354b0 ADD	W5, W5, #1

(232) 0x4354b4 ADD	W27, W25, #1

(232) 0x4354b8 SBFM	X3, X25, #0, #31

(232) 0x4354bc SBFM	X2, X27, #0, #31

(232) 0x4354c0 ADD	W24, W26, W12

(232) 0x4354c4 MUL	X23, X10, X3

(232) 0x4354c8 MUL	X7, X10, X2

(232) 0x4354cc ADD	W4, W24, #1

(232) 0x4354d0 SBFM	X1, X24, #0, #31

(232) 0x4354d4 SBFM	X4, X4, #0, #31

(232) 0x4354d8 MUL	X6, X11, X3

(232) 0x4354dc ADD	X27, X23, X4

(232) 0x4354e0 ADD	X23, X1, X23

(232) 0x4354e4 MUL	X2, X11, X2

(232) 0x4354e8 ADD	X25, X4, X7

(232) 0x4354ec ADD	X7, X1, X7

(232) 0x4354f0 MADD	X26, X15, X3, X1

(232) 0x4354f4 LDR	D28, [X8, X27,LSL #3]

(232) 0x4354f8 ADD	X27, X6, X4

(232) 0x4354fc ADD	X6, X1, X6

(232) 0x435500 ADD	X4, X4, X2

(232) 0x435504 ADD	X2, X1, X2

(232) 0x435508 MADD	X24, X22, X3, X1

(232) 0x43550c LDR	D30, [X8, X23,LSL #3]

(232) 0x435510 MADD	X23, X30, X3, X1

(232) 0x435514 MADD	X3, X17, X3, X1

(232) 0x435518 LDR	D29, [X8, X7,LSL #3]

(232) 0x43551c LDR	D31, [X8, X25,LSL #3]

(232) 0x435520 FMUL	D27, D28, D28

(232) 0x435524 LDR	D0, [X9, X27,LSL #3]

(232) 0x435528 FMUL	D24, D30, D30

(232) 0x43552c LDR	D1, [X9, X6,LSL #3]

(232) 0x435530 FMUL	D25, D29, D29

(232) 0x435534 LDR	D2, [X9, X2,LSL #3]

(232) 0x435538 FMUL	D26, D31, D31

(232) 0x43553c LDR	D3, [X9, X4,LSL #3]

(232) 0x435540 FMADD	D4, D0, D0, D27

(232) 0x435544 FMADD	D5, D1, D1, D24

(232) 0x435548 LDR	D6, [X14, X26,LSL #3]

(232) 0x43554c FMADD	D7, D2, D2, D25

(232) 0x435550 LDR	D16, [X21, X24,LSL #3]

(232) 0x435554 FMADD	D17, D3, D3, D26

(232) 0x435558 LDR	D18, [X18, X23,LSL #3]

(232) 0x43555c LDR	D28, [X16, X3,LSL #3]

(232) 0x435560 FADD	D22, D22, D6

(232) 0x435564 FMUL	D29, D6, D16

(232) 0x435568 FADD	D30, D5, D4

(232) 0x43556c FMADD	D15, D6, D28, D15

(232) 0x435570 FMADD	D23, D29, D18, D23

(232) 0x435574 FADD	D31, D17, D7

(232) 0x435578 FMUL	D27, D29, D19

(232) 0x43557c FADD	D20, D20, D29

(232) 0x435580 FADD	D0, D31, D30

(232) 0x435584 FMADD	D21, D27, D0, D21

(232) 0x435588 CMP	W0, W5

(232) 0x43558c B.NE	4354a4

0x435590 LDR	X27, [SP, #80]

0x435594 MOV	V23.D[1], V21.D[0]

0x435598 LDP	X25, X26, [SP, #64]

0x43559c STP	D22, D20, [SP, #112]

0x4355a0 B	4355b0

0x4355a4 MOVI	V23.2D, #0

0x4355a8 FMOV	D15, D23

0x4355ac STR	Q23, [SP, #112]

0x4355b0 STR	Q23, [SP, #96]

0x4355b4 BL	4105b0

0x4355b8 LDP	Q25, Q2, [SP, #96]

0x4355bc LDUR	Q19, [X19, #8]

0x4355c0 LDUR	Q24, [X19, #24]

0x4355c4 LDR	D23, [X19, #40]

0x4355c8 FADD	V26.2D, V19.2D, V2.2D

0x4355cc FADD	V3.2D, V24.2D, V25.2D

0x4355d0 FADD	D1, D23, D15

0x4355d4 LDR	D15, [SP, #88]

0x4355d8 STUR	Q26, [X19, #8]

0x4355dc STUR	Q3, [X19, #24]

0x4355e0 STR	D1, [X19, #40]

0x4355e4 LDP	X19, X20, [SP, #16]

0x4355e8 LDP	X21, X22, [SP, #32]

0x4355ec LDP	X23, X24, [SP, #48]

0x4355f0 LDP	X29, X30, [SP], #128

0x4355f4 B	410110

0x4355f8 ADD	W4, W4, #1

0x4355fc MOVZ	W5, #0

0x435600 B	435438

Coverage (%)	Name	Source Location	Module
►98.43+	omp_fulfill_event		libgomp.so.1.0.0
○	start_thread		libc.so.6
○	thread_start		libc.so.6
►1.26+	GOMP_parallel		libgomp.so.1.0.0
○	field_summary(global_variables[...]	field_summary.cpp:75	exec
○	hydro(global_variables&, paral[...]	hydro.cpp:96	exec
○	main	clover_leaf.cpp:209	exec
○	__libc_start_call_main		libc.so.6
○	__libc_start_main		libc.so.6
○	_start	clover_leaf.cpp:51	exec

min	med	avg	max

Percentile Index	10	20	30	40	50	60	70	80	90	100
Value

min	med	avg	max

Percentile Index	10	20	30	40	50	60	70	80	90	100
Value

Path /

Average path: Display a virtual path defined by average values of all real paths

The code analyzed by CQA in that panel excludes loops and represents 0.00% of application time for run gcc_4

Source file and lines	field_summary.cpp:75-91
Module	exec

The function is defined in:

/home/eoseret/qaas/qaas_runs/178-219-7589/intel/CloverLeaf2.0-CXX/build/CloverLeaf2.0-CXX/src/omp/context.h:69
/home/eoseret/qaas/qaas_runs/178-219-7589/intel/CloverLeaf2.0-CXX/build/CloverLeaf2.0-CXX/src/omp/field_summary.cpp:75-91

Warnings:
Ignoring paths for analysis

gain
potential
hint
expert

Code clean check

Detected a slowdown caused by scalar integer instructions (typically used for address computation). By removing them, you can lower the cost of an iteration from 13.50 to 12.50 cycles (1.08x speedup).

Workaround

Try to reorganize arrays of structures to structures of arrays
Consider to permute loops (see vectorization gain report)

Vectorization

Your function is not vectorized. Only 30% of vector register length is used (average across all VPU instructions). By fully vectorizing your function, you can lower the cost of an iteration from 13.50 to 12.50 cycles (1.08x speedup).

Details

15% of VPU instructions are used in vector version (process two or more data elements in vector registers):

12% of VPU loads are used in vector version.
38% of VPU stores are used in vector version.
20% of VPU addition or subtraction instructions are used in vector version.
0% of VPU fused multiply-add instructions are used in vector version.
0% of VPU instructions that are not load, store, addition, subtraction nor multiply instructions are used in vector version.

Since your execution units are vector units, only a fully vectorized function can use their full power.

Workaround

Try another compiler or update/tune your current one
Make array accesses unit-stride:
- If your function streams arrays of structures (AoS), try to use structures of arrays instead (SoA): for(i) a[i].x = b[i].x; (slow, non stride 1) => for(i) a.x[i] = b.x[i]; (fast, stride 1)

No data for this section

CALL instructions

Detected function call instructions.

Details

Calling (and then returning from) a function prevents many compiler optimizations (like vectorization), breaks control flow (which reduces pipeline performance) and executes extra instructions to save/restore the registers used inside it, which is very expensive (dozens of cycles). Consider to inline small functions.

unknown: 3 occurrences►
- /home/eoseret/qaas/qaas_runs/178-219-7589/intel/CloverLeaf2.0-CXX/build/CloverLeaf2.0-CXX/src/omp/field_summary.cpp:76
- /home/eoseret/qaas/qaas_runs/178-219-7589/intel/CloverLeaf2.0-CXX/build/CloverLeaf2.0-CXX/src/omp/field_summary.cpp:76
- /home/eoseret/qaas/qaas_runs/178-219-7589/intel/CloverLeaf2.0-CXX/build/CloverLeaf2.0-CXX/src/omp/field_summary.cpp:78

Matching between your function (in the source code) and the binary function

The binary function is composed of 5 FP arithmetical operations:

5: addition or subtraction

The binary function is loading 6 bytes.

Arithmetic intensity

Arithmetic intensity is 0.83 FP operations per loaded or stored byte.

General properties

nb instructions	78
nb uops	78
loop length	312
used w registers	14
used x registers	23
used b registers	0
used h registers	0
used s registers	1
used d registers	7
used q registers	7
used v registers	8
used z registers	0
nb stack references	18

Front-end

MACRO FUSION NOT POSSIBLE FIT IN UOP CACHE

micro-operation queue	9.75 cycles
front end	9.75 cycles

Back-end

	P0	P1	P2	P3	P4	P5	P6	P7	P8	P9	P10	P11	P12	P13	P14
uops	4.00	4.00	5.50	5.50	5.50	5.50	4.75	4.75	4.75	4.75	13.50	13.17	13.33	3.00	3.00
cycles	4.00	4.00	5.50	5.50	5.50	5.50	4.75	4.75	4.75	4.75	13.50	13.17	13.33	3.00	3.00

Execution ports to units layout:

P0: BRU
P1: BRU
P2: ALU
P3: ALU
P4: ALU
P5: ALU
P6 (128 bits): VPU, FP store data, ALU, DIV/SQRT
P7 (128 bits): VPU, ALU, FP store data
P8 (128 bits): VPU, ALU, DIV/SQRT
P9 (128 bits): ALU, VPU
P10 (256 bits): store address, load
P11 (256 bits): store address, load
P12 (256 bits): load
P13 (64 bits): store data
P14 (64 bits): store data

Cycles executing div or sqrt instructions

5.00-12.50

Cycles summary

Front-end	9.75
Dispatch	13.50
DIV/SQRT	5.00-12.50
Overall L1	13.50

Vectorization ratios

INT

all	14%
load	12%
store	38%
mul	NA (no mul vectorizable/vectorized instructions)
add-sub	0%
fma	0%
other	0%

all	22%
load	NA (no load vectorizable/vectorized instructions)
store	NA (no store vectorizable/vectorized instructions)
mul	NA (no mul vectorizable/vectorized instructions)
add-sub	66%
fma	NA (no fma vectorizable/vectorized instructions)
div/sqrt	NA (no div/sqrt vectorizable/vectorized instructions)
other	0%

INT+FP

all	15%
load	12%
store	38%
mul	NA (no mul vectorizable/vectorized instructions)
add-sub	20%
fma	0%
div/sqrt	NA (no div/sqrt vectorizable/vectorized instructions)
other	0%

Vector efficiency ratios

INT

all	30%
load	33%
store	44%
mul	NA (no mul vectorizable/vectorized instructions)
add-sub	14%
fma	12%
other	17%

all	30%
load	NA (no load vectorizable/vectorized instructions)
store	NA (no store vectorizable/vectorized instructions)
mul	NA (no mul vectorizable/vectorized instructions)
add-sub	41%
fma	NA (no fma vectorizable/vectorized instructions)
div/sqrt	NA (no div/sqrt vectorizable/vectorized instructions)
other	25%

INT+FP

all	30%
load	33%
store	44%
mul	NA (no mul vectorizable/vectorized instructions)
add-sub	22%
fma	12%
div/sqrt	NA (no div/sqrt vectorizable/vectorized instructions)
other	21%

Cycles and memory resources usage

Assuming all data fit into the L1 cache, each call to the function takes 13.50 cycles. At this rate:

0% of peak load performance is reached (0.44 out of 96.00 bytes loaded per cycle (GB/s @ 1GHz))

Front-end bottlenecks

Found no such bottlenecks.

ASM code

In the binary file, the address of the function is: 4353e0

Instruction	Nb FU	P0	P1	P2	P3	P4	P5	P6	P7	P8	P9	P10	P11	P12	P13	P14	Latency	Recip. throughput	Vectorization
STP X29, X30, [SP, #896]!	1	0	0	0.25	0.25	0.25	0.25	0	0	0	0	0.50	0.50	0	0.50	0.50	1	0.50	scal (50.0%)
ADD X29, SP, #0	1	0	0	0.25	0.25	0.25	0.25	0	0	0	0	0	0	0	0	0	1	0.25	scal (25.0%)
STP X19, X20, [SP, #16]	1	0	0	0	0	0	0	0	0	0	0	0.50	0.50	0	0.50	0.50	1	0.50	scal (50.0%)
ORR X19, XZR, X0	1	0	0	0.25	0.25	0.25	0.25	0	0	0	0	0	0	0	0	0	1	0.25	N/A
STP X21, X22, [SP, #32]	1	0	0	0	0	0	0	0	0	0	0	0.50	0.50	0	0.50	0.50	1	0.50	scal (50.0%)
STP X23, X24, [SP, #48]	1	0	0	0	0	0	0	0	0	0	0	0.50	0.50	0	0.50	0.50	1	0.50	scal (50.0%)
LDP W21, W24, [X0, #48]	1	0	0	0	0	0	0	0	0	0	0	0.33	0.33	0.33	0	0	4	0.33	scal (25.0%)
LDR W23, [X19, #60]	1	0	0	0	0	0	0	0	0	0	0	0.33	0.33	0.33	0	0	4	0.33	scal (12.5%)
LDR W0, [X0, #56]	1	0	0	0	0	0	0	0	0	0	0	0.33	0.33	0.33	0	0	4	0.33	N/A
SUB W1, W21, W24	1	0	0	0.25	0.25	0.25	0.25	0	0	0	0	0	0	0	0	0	1	0.25	scal (12.5%)
STR D15, [SP, #88]	1	0	0	0	0	0	0	0.50	0.50	0	0	0.50	0.50	0	0	0	2	0.50	scal (25.0%)
ADD W2, W1, #1	1	0	0	0.25	0.25	0.25	0.25	0	0	0	0	0	0	0	0	0	1	0.25	scal (12.5%)
SUB W3, W0, W23	1	0	0	0.25	0.25	0.25	0.25	0	0	0	0	0	0	0	0	0	1	0.25	scal (12.5%)
ADD W20, W3, #1	1	0	0	0.25	0.25	0.25	0.25	0	0	0	0	0	0	0	0	0	1	0.25	scal (12.5%)
MADD W21, W3, W2, W2	1	0	0	0	0	1	0	0	0	0	0	0	0	0	0	0	2	1	scal (12.5%)
BL 410210 <@plt_start@+0x1f0>	1	0.50	0.50	0.50	0.50	0	0	0	0	0	0	0	0	0	0	0	1	0.50	N/A
ORR W22, WZR, W0	1	0	0	0.25	0.25	0.25	0.25	0	0	0	0	0	0	0	0	0	1	0.25	scal (12.5%)
BL 410240 <@plt_start@+0x220>	1	0.50	0.50	0.50	0.50	0	0	0	0	0	0	0	0	0	0	0	1	0.50	N/A
SDIV W4, W21, W22	1	0	0	0	0	1	0	0	0	0	0	0	0	0	0	0	5-12	5-12.50	N/A
MSUB W5, W4, W22, W21	1	0	0	0	0	1	0	0	0	0	0	0	0	0	0	0	2	1	scal (12.5%)
CMP W0, W5	1	0	0	0.25	0.25	0.25	0.25	0	0	0	0	0	0	0	0	0	1	0.33	scal (12.5%)
B.LT 4355f8 <_Z13field_summaryR16global_variablesR9parallel_._omp_fn.0+0x218>	1	0.50	0.50	0	0	0	0	0	0	0	0	0	0	0	0	0	1	0.50	N/A
MADD W5, W4, W0, W5	1	0	0	0	0	1	0	0	0	0	0	0	0	0	0	0	2	1	scal (12.5%)
ADD W0, W4, W5	1	0	0	0.25	0.25	0.25	0.25	0	0	0	0	0	0	0	0	0	1	0.25	N/A
CMP W5, W0	1	0	0	0.25	0.25	0.25	0.25	0	0	0	0	0	0	0	0	0	1	0.33	scal (12.5%)
B.GE 4355a4 <_Z13field_summaryR16global_variablesR9parallel_._omp_fn.0+0x1c4>	1	0.50	0.50	0	0	0	0	0	0	0	0	0	0	0	0	0	1	0.50	N/A
MOVI D22, #0	1	0	0	0	0	0	0	0.25	0.25	0.25	0.25	0	0	0	0	0	2	0.25	scal (25.0%)
STP X25, X26, [SP, #64]	1	0	0	0	0	0	0	0	0	0	0	0.50	0.50	0	0.50	0.50	1	0.50	scal (50.0%)
FMOV D19, #0.1250000	1	0	0	0	0	0	0	0.25	0.25	0.25	0.25	0	0	0	0	0	2	0.25	scal (25.0%)
ADD W12, W23, #1	1	0	0	0.25	0.25	0.25	0.25	0	0	0	0	0	0	0	0	0	1	0.25	scal (12.5%)
ADD W13, W24, #1	1	0	0	0.25	0.25	0.25	0.25	0	0	0	0	0	0	0	0	0	1	0.25	scal (12.5%)
LDR X6, [X19]	1	0	0	0	0	0	0	0	0	0	0	0.33	0.33	0.33	0	0	4	0.33	N/A
FMOV D20, D22	1	0	0	0	0	0	0	0.25	0.25	0.25	0.25	0	0	0	0	0	2	0.25	scal (25.0%)
FMOV D23, D22	1	0	0	0	0	0	0	0.25	0.25	0.25	0.25	0	0	0	0	0	2	0.25	scal (25.0%)
FMOV D21, D22	1	0	0	0	0	0	0	0.25	0.25	0.25	0.25	0	0	0	0	0	2	0.25	scal (25.0%)
FMOV D15, D22	1	0	0	0	0	0	0	0.25	0.25	0.25	0.25	0	0	0	0	0	2	0.25	scal (25.0%)
LDR X22, [X6]	1	0	0	0	0	0	0	0	0	0	0	0.33	0.33	0.33	0	0	4	0.33	scal (25.0%)
LDR X21, [X6, #16]	1	0	0	0	0	0	0	0	0	0	0	0.33	0.33	0.33	0	0	4	0.33	scal (25.0%)
LDR X30, [X6, #48]	1	0	0	0	0	0	0	0	0	0	0	0.33	0.33	0.33	0	0	4	0.33	scal (25.0%)
LDR X18, [X6, #64]	1	0	0	0	0	0	0	0	0	0	0	0.33	0.33	0.33	0	0	4	0.33	scal (25.0%)
LDR X17, [X6, #96]	1	0	0	0	0	0	0	0	0	0	0	0.33	0.33	0.33	0	0	4	0.33	scal (25.0%)
LDR X16, [X6, #112]	1	0	0	0	0	0	0	0	0	0	0	0.33	0.33	0.33	0	0	4	0.33	scal (25.0%)
LDR X11, [X6, #168]	1	0	0	0	0	0	0	0	0	0	0	0.33	0.33	0.33	0	0	4	0.33	scal (25.0%)
LDR X9, [X6, #184]	1	0	0	0	0	0	0	0	0	0	0	0.33	0.33	0.33	0	0	4	0.33	scal (25.0%)
LDR X10, [X6, #216]	1	0	0	0	0	0	0	0	0	0	0	0.33	0.33	0.33	0	0	4	0.33	scal (25.0%)
LDR X8, [X6, #232]	1	0	0	0	0	0	0	0	0	0	0	0.33	0.33	0.33	0	0	4	0.33	scal (25.0%)
LDR X15, [X6, #656]	1	0	0	0	0	0	0	0	0	0	0	0.33	0.33	0.33	0	0	4	0.33	scal (25.0%)
LDR X14, [X6, #672]	1	0	0	0	0	0	0	0	0	0	0	0.33	0.33	0.33	0	0	4	0.33	scal (25.0%)
STR X27, [SP, #80]	1	0	0	0	0	0	0	0	0	0	0	0.50	0.50	0	0.50	0.50	1	0.50	scal (25.0%)
LDR X27, [SP, #80]	1	0	0	0	0	0	0	0	0	0	0	0.33	0.33	0.33	0	0	4	0.33	scal (25.0%)
MOV V23.D[1], V21.D[0]	1	0	0	0	0	0	0	0.25	0.25	0.25	0.25	0	0	0	0	0	2	0.25	scal (25.0%)
LDP X25, X26, [SP, #64]	1	0	0	0	0	0	0	0	0	0	0	0.33	0.33	0.33	0	0	4	1	scal (50.0%)
STP D22, D20, [SP, #112]	1	0	0	0	0	0	0	0.50	0.50	0	0	0.50	0.50	0	0	0	2	0.50	vect (50.0%)
B 4355b0 <_Z13field_summaryR16global_variablesR9parallel_._omp_fn.0+0x1d0>	1	0.50	0.50	0	0	0	0	0	0	0	0	0	0	0	0	0	1	0.50	N/A
MOVI V23.2D, #0	1	0	0	0	0	0	0	0.25	0.25	0.25	0.25	0	0	0	0	0	2	0.25	scal (25.0%)
FMOV D15, D23	1	0	0	0	0	0	0	0.25	0.25	0.25	0.25	0	0	0	0	0	2	0.25	scal (25.0%)
STR Q23, [SP, #112]	1	0	0	0	0	0	0	0.50	0.50	0	0	0.50	0.50	0	0	0	2	0.50	vect (50.0%)
STR Q23, [SP, #96]	1	0	0	0	0	0	0	0.50	0.50	0	0	0.50	0.50	0	0	0	2	0.50	vect (50.0%)
BL 4105b0 <@plt_start@+0x590>	1	0.50	0.50	0.50	0.50	0	0	0	0	0	0	0	0	0	0	0	1	0.50	N/A
LDP Q25, Q2, [SP, #96]	1	0	0	0	0	0	0	0	0	0	0	0.33	0.33	0.33	0	0	6	0.67	vect (100.0%)
LDUR Q19, [X19, #8]	1	0	0	0	0	0	0	0	0	0	0	0.33	0.33	0.33	0	0	6	0.33	vect (50.0%)
LDUR Q24, [X19, #24]	1	0	0	0	0	0	0	0	0	0	0	0.33	0.33	0.33	0	0	6	0.33	vect (50.0%)
LDR D23, [X19, #40]	1	0	0	0	0	0	0	0	0	0	0	0.33	0.33	0.33	0	0	6	0.33	scal (25.0%)
FADD V26.2D, V19.2D, V2.2D	1	0	0	0	0	0	0	0.25	0.25	0.25	0.25	0	0	0	0	0	2	0.25	vect (50.0%)
FADD V3.2D, V24.2D, V25.2D	1	0	0	0	0	0	0	0.25	0.25	0.25	0.25	0	0	0	0	0	2	0.25	vect (50.0%)
FADD D1, D23, D15	1	0	0	0	0	0	0	0.25	0.25	0.25	0.25	0	0	0	0	0	2	0.25	scal (25.0%)
LDR D15, [SP, #88]	1	0	0	0	0	0	0	0	0	0	0	0.33	0.33	0.33	0	0	6	0.33	scal (25.0%)
STUR Q26, [X19, #8]	1	0	0	0	0	0	0	0.50	0.50	0	0	0.50	0.50	0	0	0	2	0.50	vect (50.0%)
STUR Q3, [X19, #24]	1	0	0	0	0	0	0	0.50	0.50	0	0	0.50	0.50	0	0	0	2	0.50	vect (50.0%)
STR D1, [X19, #40]	1	0	0	0	0	0	0	0.50	0.50	0	0	0.50	0.50	0	0	0	2	0.50	scal (25.0%)
LDP X19, X20, [SP, #16]	1	0	0	0	0	0	0	0	0	0	0	0.33	0.33	0.33	0	0	4	1	N/A
LDP X21, X22, [SP, #32]	1	0	0	0	0	0	0	0	0	0	0	0.33	0.33	0.33	0	0	4	1	scal (50.0%)
LDP X23, X24, [SP, #48]	1	0	0	0	0	0	0	0	0	0	0	0.33	0.33	0.33	0	0	4	1	scal (50.0%)
LDP X29, X30, [SP], #128	1	0	0	0	0	0	0	0	0	0	0	0.33	0.33	0.33	0	0	4	1	scal (50.0%)
B 410110 <@plt_start@+0xf0>	1	0.50	0.50	0	0	0	0	0	0	0	0	0	0	0	0	0	1	0.50	N/A
ADD W4, W4, #1	1	0	0	0.25	0.25	0.25	0.25	0	0	0	0	0	0	0	0	0	1	0.25	N/A
MOVZ W5, #0	1	0	0	0.25	0.25	0.25	0.25	0	0	0	0	0	0	0	0	0	1	0.25	scal (12.5%)
B 435438 <_Z13field_summaryR16global_variablesR9parallel_._omp_fn.0+0x58>	1	0.50	0.50	0	0	0	0	0	0	0	0	0	0	0	0	0	1	0.50	N/A

The code analyzed by CQA in that panel excludes loops and represents 0.00% of application time for run gcc_4

Source file and lines	field_summary.cpp:75-91
Module	exec

The function is defined in:

/home/eoseret/qaas/qaas_runs/178-219-7589/intel/CloverLeaf2.0-CXX/build/CloverLeaf2.0-CXX/src/omp/context.h:69
/home/eoseret/qaas/qaas_runs/178-219-7589/intel/CloverLeaf2.0-CXX/build/CloverLeaf2.0-CXX/src/omp/field_summary.cpp:75-91

Warnings:
Ignoring paths for analysis

gain
potential
hint
expert

Code clean check

Workaround

Try to reorganize arrays of structures to structures of arrays
Consider to permute loops (see vectorization gain report)

Vectorization

Details

15% of VPU instructions are used in vector version (process two or more data elements in vector registers):

12% of VPU loads are used in vector version.
38% of VPU stores are used in vector version.
20% of VPU addition or subtraction instructions are used in vector version.
0% of VPU fused multiply-add instructions are used in vector version.
0% of VPU instructions that are not load, store, addition, subtraction nor multiply instructions are used in vector version.

Since your execution units are vector units, only a fully vectorized function can use their full power.

Workaround

Try another compiler or update/tune your current one
Make array accesses unit-stride:
- If your function streams arrays of structures (AoS), try to use structures of arrays instead (SoA): for(i) a[i].x = b[i].x; (slow, non stride 1) => for(i) a.x[i] = b.x[i]; (fast, stride 1)

No data for this section

CALL instructions

Detected function call instructions.

Details

unknown: 3 occurrences►
- /home/eoseret/qaas/qaas_runs/178-219-7589/intel/CloverLeaf2.0-CXX/build/CloverLeaf2.0-CXX/src/omp/field_summary.cpp:76
- /home/eoseret/qaas/qaas_runs/178-219-7589/intel/CloverLeaf2.0-CXX/build/CloverLeaf2.0-CXX/src/omp/field_summary.cpp:76
- /home/eoseret/qaas/qaas_runs/178-219-7589/intel/CloverLeaf2.0-CXX/build/CloverLeaf2.0-CXX/src/omp/field_summary.cpp:78

Matching between your function (in the source code) and the binary function

The binary function is composed of 5 FP arithmetical operations:

5: addition or subtraction

The binary function is loading 6 bytes.

Arithmetic intensity

Arithmetic intensity is 0.83 FP operations per loaded or stored byte.

General properties

nb instructions	78
nb uops	78
loop length	312
used w registers	14
used x registers	23
used b registers	0
used h registers	0
used s registers	1
used d registers	7
used q registers	7
used v registers	8
used z registers	0
nb stack references	18

Front-end

MACRO FUSION NOT POSSIBLE FIT IN UOP CACHE

micro-operation queue	9.75 cycles
front end	9.75 cycles

Back-end

	P0	P1	P2	P3	P4	P5	P6	P7	P8	P9	P10	P11	P12	P13	P14
uops	4.00	4.00	5.50	5.50	5.50	5.50	4.75	4.75	4.75	4.75	13.50	13.17	13.33	3.00	3.00
cycles	4.00	4.00	5.50	5.50	5.50	5.50	4.75	4.75	4.75	4.75	13.50	13.17	13.33	3.00	3.00

Execution ports to units layout:

P0: BRU
P1: BRU
P2: ALU
P3: ALU
P4: ALU
P5: ALU
P6 (128 bits): VPU, FP store data, ALU, DIV/SQRT
P7 (128 bits): VPU, ALU, FP store data
P8 (128 bits): VPU, ALU, DIV/SQRT
P9 (128 bits): ALU, VPU
P10 (256 bits): store address, load
P11 (256 bits): store address, load
P12 (256 bits): load
P13 (64 bits): store data
P14 (64 bits): store data

Cycles executing div or sqrt instructions

5.00-12.50

Cycles summary

Front-end	9.75
Dispatch	13.50
DIV/SQRT	5.00-12.50
Overall L1	13.50

Vectorization ratios

INT

all	14%
load	12%
store	38%
mul	NA (no mul vectorizable/vectorized instructions)
add-sub	0%
fma	0%
other	0%

all	22%
load	NA (no load vectorizable/vectorized instructions)
store	NA (no store vectorizable/vectorized instructions)
mul	NA (no mul vectorizable/vectorized instructions)
add-sub	66%
fma	NA (no fma vectorizable/vectorized instructions)
div/sqrt	NA (no div/sqrt vectorizable/vectorized instructions)
other	0%

INT+FP

all	15%
load	12%
store	38%
mul	NA (no mul vectorizable/vectorized instructions)
add-sub	20%
fma	0%
div/sqrt	NA (no div/sqrt vectorizable/vectorized instructions)
other	0%

Vector efficiency ratios

INT

all	30%
load	33%
store	44%
mul	NA (no mul vectorizable/vectorized instructions)
add-sub	14%
fma	12%
other	17%

all	30%
load	NA (no load vectorizable/vectorized instructions)
store	NA (no store vectorizable/vectorized instructions)
mul	NA (no mul vectorizable/vectorized instructions)
add-sub	41%
fma	NA (no fma vectorizable/vectorized instructions)
div/sqrt	NA (no div/sqrt vectorizable/vectorized instructions)
other	25%

INT+FP

all	30%
load	33%
store	44%
mul	NA (no mul vectorizable/vectorized instructions)
add-sub	22%
fma	12%
div/sqrt	NA (no div/sqrt vectorizable/vectorized instructions)
other	21%

Cycles and memory resources usage

Assuming all data fit into the L1 cache, each call to the function takes 13.50 cycles. At this rate:

0% of peak load performance is reached (0.44 out of 96.00 bytes loaded per cycle (GB/s @ 1GHz))

Front-end bottlenecks

Found no such bottlenecks.

ASM code

In the binary file, the address of the function is: 4353e0

Instruction	Nb FU	P0	P1	P2	P3	P4	P5	P6	P7	P8	P9	P10	P11	P12	P13	P14	Latency	Recip. throughput	Vectorization
STP X29, X30, [SP, #896]!	1	0	0	0.25	0.25	0.25	0.25	0	0	0	0	0.50	0.50	0	0.50	0.50	1	0.50	scal (50.0%)
ADD X29, SP, #0	1	0	0	0.25	0.25	0.25	0.25	0	0	0	0	0	0	0	0	0	1	0.25	scal (25.0%)
STP X19, X20, [SP, #16]	1	0	0	0	0	0	0	0	0	0	0	0.50	0.50	0	0.50	0.50	1	0.50	scal (50.0%)
ORR X19, XZR, X0	1	0	0	0.25	0.25	0.25	0.25	0	0	0	0	0	0	0	0	0	1	0.25	N/A
STP X21, X22, [SP, #32]	1	0	0	0	0	0	0	0	0	0	0	0.50	0.50	0	0.50	0.50	1	0.50	scal (50.0%)
STP X23, X24, [SP, #48]	1	0	0	0	0	0	0	0	0	0	0	0.50	0.50	0	0.50	0.50	1	0.50	scal (50.0%)
LDP W21, W24, [X0, #48]	1	0	0	0	0	0	0	0	0	0	0	0.33	0.33	0.33	0	0	4	0.33	scal (25.0%)
LDR W23, [X19, #60]	1	0	0	0	0	0	0	0	0	0	0	0.33	0.33	0.33	0	0	4	0.33	scal (12.5%)
LDR W0, [X0, #56]	1	0	0	0	0	0	0	0	0	0	0	0.33	0.33	0.33	0	0	4	0.33	N/A
SUB W1, W21, W24	1	0	0	0.25	0.25	0.25	0.25	0	0	0	0	0	0	0	0	0	1	0.25	scal (12.5%)
STR D15, [SP, #88]	1	0	0	0	0	0	0	0.50	0.50	0	0	0.50	0.50	0	0	0	2	0.50	scal (25.0%)
ADD W2, W1, #1	1	0	0	0.25	0.25	0.25	0.25	0	0	0	0	0	0	0	0	0	1	0.25	scal (12.5%)
SUB W3, W0, W23	1	0	0	0.25	0.25	0.25	0.25	0	0	0	0	0	0	0	0	0	1	0.25	scal (12.5%)
ADD W20, W3, #1	1	0	0	0.25	0.25	0.25	0.25	0	0	0	0	0	0	0	0	0	1	0.25	scal (12.5%)
MADD W21, W3, W2, W2	1	0	0	0	0	1	0	0	0	0	0	0	0	0	0	0	2	1	scal (12.5%)
BL 410210 <@plt_start@+0x1f0>	1	0.50	0.50	0.50	0.50	0	0	0	0	0	0	0	0	0	0	0	1	0.50	N/A
ORR W22, WZR, W0	1	0	0	0.25	0.25	0.25	0.25	0	0	0	0	0	0	0	0	0	1	0.25	scal (12.5%)
BL 410240 <@plt_start@+0x220>	1	0.50	0.50	0.50	0.50	0	0	0	0	0	0	0	0	0	0	0	1	0.50	N/A
SDIV W4, W21, W22	1	0	0	0	0	1	0	0	0	0	0	0	0	0	0	0	5-12	5-12.50	N/A
MSUB W5, W4, W22, W21	1	0	0	0	0	1	0	0	0	0	0	0	0	0	0	0	2	1	scal (12.5%)
CMP W0, W5	1	0	0	0.25	0.25	0.25	0.25	0	0	0	0	0	0	0	0	0	1	0.33	scal (12.5%)
B.LT 4355f8 <_Z13field_summaryR16global_variablesR9parallel_._omp_fn.0+0x218>	1	0.50	0.50	0	0	0	0	0	0	0	0	0	0	0	0	0	1	0.50	N/A
MADD W5, W4, W0, W5	1	0	0	0	0	1	0	0	0	0	0	0	0	0	0	0	2	1	scal (12.5%)
ADD W0, W4, W5	1	0	0	0.25	0.25	0.25	0.25	0	0	0	0	0	0	0	0	0	1	0.25	N/A
CMP W5, W0	1	0	0	0.25	0.25	0.25	0.25	0	0	0	0	0	0	0	0	0	1	0.33	scal (12.5%)
B.GE 4355a4 <_Z13field_summaryR16global_variablesR9parallel_._omp_fn.0+0x1c4>	1	0.50	0.50	0	0	0	0	0	0	0	0	0	0	0	0	0	1	0.50	N/A
MOVI D22, #0	1	0	0	0	0	0	0	0.25	0.25	0.25	0.25	0	0	0	0	0	2	0.25	scal (25.0%)
STP X25, X26, [SP, #64]	1	0	0	0	0	0	0	0	0	0	0	0.50	0.50	0	0.50	0.50	1	0.50	scal (50.0%)
FMOV D19, #0.1250000	1	0	0	0	0	0	0	0.25	0.25	0.25	0.25	0	0	0	0	0	2	0.25	scal (25.0%)
ADD W12, W23, #1	1	0	0	0.25	0.25	0.25	0.25	0	0	0	0	0	0	0	0	0	1	0.25	scal (12.5%)
ADD W13, W24, #1	1	0	0	0.25	0.25	0.25	0.25	0	0	0	0	0	0	0	0	0	1	0.25	scal (12.5%)
LDR X6, [X19]	1	0	0	0	0	0	0	0	0	0	0	0.33	0.33	0.33	0	0	4	0.33	N/A
FMOV D20, D22	1	0	0	0	0	0	0	0.25	0.25	0.25	0.25	0	0	0	0	0	2	0.25	scal (25.0%)
FMOV D23, D22	1	0	0	0	0	0	0	0.25	0.25	0.25	0.25	0	0	0	0	0	2	0.25	scal (25.0%)
FMOV D21, D22	1	0	0	0	0	0	0	0.25	0.25	0.25	0.25	0	0	0	0	0	2	0.25	scal (25.0%)
FMOV D15, D22	1	0	0	0	0	0	0	0.25	0.25	0.25	0.25	0	0	0	0	0	2	0.25	scal (25.0%)
LDR X22, [X6]	1	0	0	0	0	0	0	0	0	0	0	0.33	0.33	0.33	0	0	4	0.33	scal (25.0%)
LDR X21, [X6, #16]	1	0	0	0	0	0	0	0	0	0	0	0.33	0.33	0.33	0	0	4	0.33	scal (25.0%)
LDR X30, [X6, #48]	1	0	0	0	0	0	0	0	0	0	0	0.33	0.33	0.33	0	0	4	0.33	scal (25.0%)
LDR X18, [X6, #64]	1	0	0	0	0	0	0	0	0	0	0	0.33	0.33	0.33	0	0	4	0.33	scal (25.0%)
LDR X17, [X6, #96]	1	0	0	0	0	0	0	0	0	0	0	0.33	0.33	0.33	0	0	4	0.33	scal (25.0%)
LDR X16, [X6, #112]	1	0	0	0	0	0	0	0	0	0	0	0.33	0.33	0.33	0	0	4	0.33	scal (25.0%)
LDR X11, [X6, #168]	1	0	0	0	0	0	0	0	0	0	0	0.33	0.33	0.33	0	0	4	0.33	scal (25.0%)
LDR X9, [X6, #184]	1	0	0	0	0	0	0	0	0	0	0	0.33	0.33	0.33	0	0	4	0.33	scal (25.0%)
LDR X10, [X6, #216]	1	0	0	0	0	0	0	0	0	0	0	0.33	0.33	0.33	0	0	4	0.33	scal (25.0%)
LDR X8, [X6, #232]	1	0	0	0	0	0	0	0	0	0	0	0.33	0.33	0.33	0	0	4	0.33	scal (25.0%)
LDR X15, [X6, #656]	1	0	0	0	0	0	0	0	0	0	0	0.33	0.33	0.33	0	0	4	0.33	scal (25.0%)
LDR X14, [X6, #672]	1	0	0	0	0	0	0	0	0	0	0	0.33	0.33	0.33	0	0	4	0.33	scal (25.0%)
STR X27, [SP, #80]	1	0	0	0	0	0	0	0	0	0	0	0.50	0.50	0	0.50	0.50	1	0.50	scal (25.0%)
LDR X27, [SP, #80]	1	0	0	0	0	0	0	0	0	0	0	0.33	0.33	0.33	0	0	4	0.33	scal (25.0%)
MOV V23.D[1], V21.D[0]	1	0	0	0	0	0	0	0.25	0.25	0.25	0.25	0	0	0	0	0	2	0.25	scal (25.0%)
LDP X25, X26, [SP, #64]	1	0	0	0	0	0	0	0	0	0	0	0.33	0.33	0.33	0	0	4	1	scal (50.0%)
STP D22, D20, [SP, #112]	1	0	0	0	0	0	0	0.50	0.50	0	0	0.50	0.50	0	0	0	2	0.50	vect (50.0%)
B 4355b0 <_Z13field_summaryR16global_variablesR9parallel_._omp_fn.0+0x1d0>	1	0.50	0.50	0	0	0	0	0	0	0	0	0	0	0	0	0	1	0.50	N/A
MOVI V23.2D, #0	1	0	0	0	0	0	0	0.25	0.25	0.25	0.25	0	0	0	0	0	2	0.25	scal (25.0%)
FMOV D15, D23	1	0	0	0	0	0	0	0.25	0.25	0.25	0.25	0	0	0	0	0	2	0.25	scal (25.0%)
STR Q23, [SP, #112]	1	0	0	0	0	0	0	0.50	0.50	0	0	0.50	0.50	0	0	0	2	0.50	vect (50.0%)
STR Q23, [SP, #96]	1	0	0	0	0	0	0	0.50	0.50	0	0	0.50	0.50	0	0	0	2	0.50	vect (50.0%)
BL 4105b0 <@plt_start@+0x590>	1	0.50	0.50	0.50	0.50	0	0	0	0	0	0	0	0	0	0	0	1	0.50	N/A
LDP Q25, Q2, [SP, #96]	1	0	0	0	0	0	0	0	0	0	0	0.33	0.33	0.33	0	0	6	0.67	vect (100.0%)
LDUR Q19, [X19, #8]	1	0	0	0	0	0	0	0	0	0	0	0.33	0.33	0.33	0	0	6	0.33	vect (50.0%)
LDUR Q24, [X19, #24]	1	0	0	0	0	0	0	0	0	0	0	0.33	0.33	0.33	0	0	6	0.33	vect (50.0%)
LDR D23, [X19, #40]	1	0	0	0	0	0	0	0	0	0	0	0.33	0.33	0.33	0	0	6	0.33	scal (25.0%)
FADD V26.2D, V19.2D, V2.2D	1	0	0	0	0	0	0	0.25	0.25	0.25	0.25	0	0	0	0	0	2	0.25	vect (50.0%)
FADD V3.2D, V24.2D, V25.2D	1	0	0	0	0	0	0	0.25	0.25	0.25	0.25	0	0	0	0	0	2	0.25	vect (50.0%)
FADD D1, D23, D15	1	0	0	0	0	0	0	0.25	0.25	0.25	0.25	0	0	0	0	0	2	0.25	scal (25.0%)
LDR D15, [SP, #88]	1	0	0	0	0	0	0	0	0	0	0	0.33	0.33	0.33	0	0	6	0.33	scal (25.0%)
STUR Q26, [X19, #8]	1	0	0	0	0	0	0	0.50	0.50	0	0	0.50	0.50	0	0	0	2	0.50	vect (50.0%)
STUR Q3, [X19, #24]	1	0	0	0	0	0	0	0.50	0.50	0	0	0.50	0.50	0	0	0	2	0.50	vect (50.0%)
STR D1, [X19, #40]	1	0	0	0	0	0	0	0.50	0.50	0	0	0.50	0.50	0	0	0	2	0.50	scal (25.0%)
LDP X19, X20, [SP, #16]	1	0	0	0	0	0	0	0	0	0	0	0.33	0.33	0.33	0	0	4	1	N/A
LDP X21, X22, [SP, #32]	1	0	0	0	0	0	0	0	0	0	0	0.33	0.33	0.33	0	0	4	1	scal (50.0%)
LDP X23, X24, [SP, #48]	1	0	0	0	0	0	0	0	0	0	0	0.33	0.33	0.33	0	0	4	1	scal (50.0%)
LDP X29, X30, [SP], #128	1	0	0	0	0	0	0	0	0	0	0	0.33	0.33	0.33	0	0	4	1	scal (50.0%)
B 410110 <@plt_start@+0xf0>	1	0.50	0.50	0	0	0	0	0	0	0	0	0	0	0	0	0	1	0.50	N/A
ADD W4, W4, #1	1	0	0	0.25	0.25	0.25	0.25	0	0	0	0	0	0	0	0	0	1	0.25	N/A
MOVZ W5, #0	1	0	0	0.25	0.25	0.25	0.25	0	0	0	0	0	0	0	0	0	1	0.25	scal (12.5%)
B 435438 <_Z13field_summaryR16global_variablesR9parallel_._omp_fn.0+0x58>	1	0.50	0.50	0	0	0	0	0	0	0	0	0	0	0	0	0	1	0.50	N/A

Name	Coverage (%)	Time (s)
▼field_summary(global_variables&, parallel_&) [clone ._omp_fn.0]–	0.34	0.46
○Loop 232 - context.h:69-69 - exec	0.34	0.45

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Code clean check

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Vectorization

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CALL instructions

Details

Matching between your function (in the source code) and the binary function

Arithmetic intensity

General properties

Front-end

Back-end

Cycles summary

Vectorization ratios

Vector efficiency ratios

Cycles and memory resources usage

Front-end bottlenecks

ASM code