OV - exec - Loop 306

	Loop Id: 306	Module: exec	Source: revert.cpp:37-38 [...]	Coverage: 0.90%

0x43f074 LDR	Q21, [X4, X0]    [1]

0x43f078 ADD	X14, X0, #16

0x43f07c ADD	X28, X0, #32

0x43f080 ADD	X27, X0, #48

0x43f084 ADD	X26, X0, #64

0x43f088 ADD	X25, X0, #80

0x43f08c ADD	X23, X0, #96

0x43f090 ADD	X19, X0, #112

0x43f094 STR	Q21, [X3, X0]    [4]

0x43f098 LDR	Q22, [X2, X0]    [3]

0x43f09c STR	Q22, [X1, X0]    [2]

0x43f0a0 ADD	X0, X0, #128

0x43f0a4 LDR	Q23, [X4, X14]    [1]

0x43f0a8 STR	Q23, [X3, X14]    [4]

0x43f0ac LDR	Q24, [X2, X14]    [3]

0x43f0b0 STR	Q24, [X1, X14]    [2]

0x43f0b4 LDR	Q25, [X4, X28]    [1]

0x43f0b8 STR	Q25, [X3, X28]    [4]

0x43f0bc LDR	Q26, [X2, X28]    [3]

0x43f0c0 STR	Q26, [X1, X28]    [2]

0x43f0c4 LDR	Q27, [X4, X27]    [1]

0x43f0c8 STR	Q27, [X3, X27]    [4]

0x43f0cc LDR	Q28, [X2, X27]    [3]

0x43f0d0 STR	Q28, [X1, X27]    [2]

0x43f0d4 LDR	Q29, [X4, X26]    [1]

0x43f0d8 STR	Q29, [X3, X26]    [4]

0x43f0dc LDR	Q30, [X2, X26]    [3]

0x43f0e0 STR	Q30, [X1, X26]    [2]

0x43f0e4 LDR	Q31, [X4, X25]    [1]

0x43f0e8 STR	Q31, [X3, X25]    [4]

0x43f0ec LDR	Q0, [X2, X25]    [3]

0x43f0f0 STR	Q0, [X1, X25]    [2]

0x43f0f4 LDR	Q1, [X4, X23]    [1]

0x43f0f8 STR	Q1, [X3, X23]    [4]

0x43f0fc LDR	Q2, [X2, X23]    [3]

0x43f100 STR	Q2, [X1, X23]    [2]

0x43f104 LDR	Q3, [X4, X19]    [1]

0x43f108 STR	Q3, [X3, X19]    [4]

0x43f10c LDR	Q4, [X2, X19]    [3]

0x43f110 STR	Q4, [X1, X19]    [2]

0x43f114 CMP	X8, X0

0x43f118 B.NE	43f074

/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/revert.cpp: 37 - 38

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

37:       density1(i, j) = density0(i, j);

38:       energy1(i, j) = energy0(i, j);

Coverage (%)	Name	Source Location	Module
►100.00+	GOMP_parallel		libgomp.so.1.0.0
○	revert(global_variables&)	revert.cpp:48	exec
○	PdV(global_variables&, bool)	PdV.cpp:131	exec
○	hydro(global_variables&, paral[...]	hydro.cpp:64	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

Coverage (%)	Name	Source Location	Module
►50.70+	GOMP_parallel		libgomp.so.1.0.0
○	revert(global_variables&)	revert.cpp:48	exec
○	PdV(global_variables&, bool)	PdV.cpp:131	exec
○	hydro(global_variables&, paral[...]	hydro.cpp:64	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
►49.30+	omp_fulfill_event		libgomp.so.1.0.0
○	start_thread		libc.so.6
○	thread_start		libc.so.6

Coverage (%)	Name	Source Location	Module
►74.45+	omp_fulfill_event		libgomp.so.1.0.0
○	start_thread		libc.so.6
○	thread_start		libc.so.6
►25.55+	GOMP_parallel		libgomp.so.1.0.0
○	revert(global_variables&)	revert.cpp:48	exec
○	PdV(global_variables&, bool)	PdV.cpp:131	exec
○	hydro(global_variables&, paral[...]	hydro.cpp:64	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

Coverage (%)	Name	Source Location	Module
►87.47+	omp_fulfill_event		libgomp.so.1.0.0
○	start_thread		libc.so.6
○	thread_start		libc.so.6
►12.53+	GOMP_parallel		libgomp.so.1.0.0
○	revert(global_variables&)	revert.cpp:48	exec
○	PdV(global_variables&, bool)	PdV.cpp:131	exec
○	hydro(global_variables&, paral[...]	hydro.cpp:64	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

Coverage (%)	Name	Source Location	Module
►93.58+	omp_fulfill_event		libgomp.so.1.0.0
○	start_thread		libc.so.6
○	thread_start		libc.so.6
►6.42+	GOMP_parallel		libgomp.so.1.0.0
○	revert(global_variables&)	revert.cpp:48	exec
○	PdV(global_variables&, bool)	PdV.cpp:131	exec
○	hydro(global_variables&, paral[...]	hydro.cpp:64	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

Coverage (%)	Name	Source Location	Module
►95.82+	omp_fulfill_event		libgomp.so.1.0.0
○	start_thread		libc.so.6
○	thread_start		libc.so.6
►4.18+	GOMP_parallel		libgomp.so.1.0.0
○	revert(global_variables&)	revert.cpp:48	exec
○	PdV(global_variables&, bool)	PdV.cpp:131	exec
○	hydro(global_variables&, paral[...]	hydro.cpp:64	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

Coverage (%)	Name	Source Location	Module
►96.84+	omp_fulfill_event		libgomp.so.1.0.0
○	start_thread		libc.so.6
○	thread_start		libc.so.6
►3.16+	GOMP_parallel		libgomp.so.1.0.0
○	revert(global_variables&)	revert.cpp:48	exec
○	PdV(global_variables&, bool)	PdV.cpp:131	exec
○	hydro(global_variables&, paral[...]	hydro.cpp:64	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

Coverage (%)	Name	Source Location	Module
►97.48+	omp_fulfill_event		libgomp.so.1.0.0
○	start_thread		libc.so.6
○	thread_start		libc.so.6
►2.52+	GOMP_parallel		libgomp.so.1.0.0
○	revert(global_variables&)	revert.cpp:48	exec
○	PdV(global_variables&, bool)	PdV.cpp:131	exec
○	hydro(global_variables&, paral[...]	hydro.cpp:64	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

Coverage (%)	Name	Source Location	Module
►97.91+	omp_fulfill_event		libgomp.so.1.0.0
○	start_thread		libc.so.6
○	thread_start		libc.so.6
►2.09+	GOMP_parallel		libgomp.so.1.0.0
○	revert(global_variables&)	revert.cpp:48	exec
○	PdV(global_variables&, bool)	PdV.cpp:131	exec
○	hydro(global_variables&, paral[...]	hydro.cpp:64	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

Coverage (%)	Name	Source Location	Module
►98.20+	omp_fulfill_event		libgomp.so.1.0.0
○	start_thread		libc.so.6
○	thread_start		libc.so.6
►1.80+	GOMP_parallel		libgomp.so.1.0.0
○	revert(global_variables&)	revert.cpp:48	exec
○	PdV(global_variables&, bool)	PdV.cpp:131	exec
○	hydro(global_variables&, paral[...]	hydro.cpp:64	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

Coverage (%)	Name	Source Location	Module
►98.42+	omp_fulfill_event		libgomp.so.1.0.0
○	start_thread		libc.so.6
○	thread_start		libc.so.6
►1.58+	GOMP_parallel		libgomp.so.1.0.0
○	revert(global_variables&)	revert.cpp:48	exec
○	PdV(global_variables&, bool)	PdV.cpp:131	exec
○	hydro(global_variables&, paral[...]	hydro.cpp:64	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 /

Metric	Value
CQA speedup if no scalar integer	1.00
CQA speedup if FP arith vectorized	1.00
CQA speedup if fully vectorized	2.00
CQA speedup if no inter-iteration dependency	NA
CQA speedup if next bottleneck killed	1.33
Bottlenecks	P10, P11, P12,
Function	revert_kernel(int, int, int, int, clover::Buffer2D&, clover::Buffer2D&, clover::Buffer2D&, clover::Buffer2D&) [clone ._omp_fn.0]
Source	context.h:69-69,revert.cpp:37-38
Source loop unroll info	not unrolled or unrolled with no peel/tail loop
Source loop unroll confidence level	NA
Unroll/vectorization loop type	NA
Unroll factor	NA
CQA cycles	10.67
CQA cycles if no scalar integer	10.67
CQA cycles if FP arith vectorized	10.67
CQA cycles if fully vectorized	5.33
Front-end cycles	5.25
P0 cycles	0.50
P1 cycles	0.50
P2 cycles	2.25
P3 cycles	2.25
P4 cycles	2.25
P5 cycles	2.25
P6 cycles	8.00
P7 cycles	8.00
P8 cycles	0.00
P9 cycles	0.00
P10 cycles	10.67
P11 cycles	10.67
P12 cycles	10.67
P13 cycles	0.00
P14 cycles	0.00
DIV/SQRT cycles	0.00
Inter-iter dependencies cycles	1
FE+BE cycles (UFS)	NA
Stall cycles (UFS)	NA
Nb insns	42.00
Nb uops	42.00
Nb loads	NA
Nb stores	16.00
Nb stack references	0.00
FLOP/cycle	0.00
Nb FLOP add-sub	0.00
Nb FLOP mul	0.00
Nb FLOP fma	0.00
Nb FLOP div	0.00
Nb FLOP rcp	0.00
Nb FLOP sqrt	0.00
Nb FLOP rsqrt	0.00
Bytes/cycle	0.00
Bytes prefetched	0.00
Bytes loaded	0.00
Bytes stored	0.00
Stride 0	0.00
Stride 1	0.00
Stride n	4.00
Stride unknown	0.00
Stride indirect	0.00
Vectorization ratio all	100.00
Vectorization ratio load	100.00
Vectorization ratio store	100.00
Vectorization ratio mul	NA
Vectorization ratio add_sub	NA
Vectorization ratio fma	NA
Vectorization ratio div_sqrt	NA
Vectorization ratio other	NA
Vector-efficiency ratio all	50.00
Vector-efficiency ratio load	50.00
Vector-efficiency ratio store	50.00
Vector-efficiency ratio mul	NA
Vector-efficiency ratio add_sub	NA
Vector-efficiency ratio fma	NA
Vector-efficiency ratio div_sqrt	NA
Vector-efficiency ratio other	NA

Metric	Value
CQA speedup if no scalar integer	1.00
CQA speedup if FP arith vectorized	1.00
CQA speedup if fully vectorized	2.00
CQA speedup if no inter-iteration dependency	NA
CQA speedup if next bottleneck killed	1.33
Bottlenecks	P10, P11, P12,
Function	revert_kernel(int, int, int, int, clover::Buffer2D&, clover::Buffer2D&, clover::Buffer2D&, clover::Buffer2D&) [clone ._omp_fn.0]
Source	context.h:69-69,revert.cpp:37-38
Source loop unroll info	not unrolled or unrolled with no peel/tail loop
Source loop unroll confidence level	NA
Unroll/vectorization loop type	NA
Unroll factor	NA
CQA cycles	10.67
CQA cycles if no scalar integer	10.67
CQA cycles if FP arith vectorized	10.67
CQA cycles if fully vectorized	5.33
Front-end cycles	5.25
P0 cycles	0.50
P1 cycles	0.50
P2 cycles	2.25
P3 cycles	2.25
P4 cycles	2.25
P5 cycles	2.25
P6 cycles	8.00
P7 cycles	8.00
P8 cycles	0.00
P9 cycles	0.00
P10 cycles	10.67
P11 cycles	10.67
P12 cycles	10.67
P13 cycles	0.00
P14 cycles	0.00
DIV/SQRT cycles	0.00
Inter-iter dependencies cycles	1
FE+BE cycles (UFS)	NA
Stall cycles (UFS)	NA
Nb insns	42.00
Nb uops	42.00
Nb loads	NA
Nb stores	16.00
Nb stack references	0.00
FLOP/cycle	0.00
Nb FLOP add-sub	0.00
Nb FLOP mul	0.00
Nb FLOP fma	0.00
Nb FLOP div	0.00
Nb FLOP rcp	0.00
Nb FLOP sqrt	0.00
Nb FLOP rsqrt	0.00
Bytes/cycle	0.00
Bytes prefetched	0.00
Bytes loaded	0.00
Bytes stored	0.00
Stride 0	0.00
Stride 1	0.00
Stride n	4.00
Stride unknown	0.00
Stride indirect	0.00
Vectorization ratio all	100.00
Vectorization ratio load	100.00
Vectorization ratio store	100.00
Vectorization ratio mul	NA
Vectorization ratio add_sub	NA
Vectorization ratio fma	NA
Vectorization ratio div_sqrt	NA
Vectorization ratio other	NA
Vector-efficiency ratio all	50.00
Vector-efficiency ratio load	50.00
Vector-efficiency ratio store	50.00
Vector-efficiency ratio mul	NA
Vector-efficiency ratio add_sub	NA
Vector-efficiency ratio fma	NA
Vector-efficiency ratio div_sqrt	NA
Vector-efficiency ratio other	NA

Path /

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

Function	revert_kernel(int, int, int, int, clover::Buffer2D&, clover::Buffer2D&, clover::Buffer2D&, clover::Buffer2D&) [clone ._omp_fn.0]
Source file and lines	revert.cpp:37-38
Module	exec

The loop 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/revert.cpp:37-38

The related source loop is not unrolled or unrolled with no peel/tail loop.

gain
potential
hint
expert

Vectorization

Your loop is vectorized, but using only 128 out of 256 bits (SSE/AVX-128 instructions on AVX/AVX2 processors). By fully vectorizing your loop, you can lower the cost of an iteration from 10.67 to 5.33 cycles (2.00x speedup).

Details

All VPU instructions are used in vector version (process two or more data elements in vector registers). Since your execution units are vector units, only a fully vectorized loop can use their full power.

No data for this section

Slow data structures access

Detected data structures (typically arrays) that cannot be efficiently read/written

Details

Constant non-unit stride: 4 occurrence(s)

Non-unit stride (uncontiguous) accesses are not efficiently using data caches

Workaround

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

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

The binary loop does not contain any FP arithmetical operations. The binary loop does not load or store any data.

General properties

nb instructions	42
nb uops	42
loop length	168
used w registers	0
used x registers	13
used b registers	0
used h registers	0
used s registers	0
used d registers	0
used q registers	16
used v registers	0
used z registers	0
nb stack references	0

Front-end

MACRO FUSION NOT POSSIBLE FIT IN UOP CACHE

micro-operation queue	5.25 cycles
front end	5.25 cycles

Back-end

	P0	P1	P2	P3	P4	P5	P6	P7	P8	P9	P10	P11	P12	P13	P14
uops	0.50	0.50	2.25	2.25	2.25	2.25	8.00	8.00	0.00	0.00	10.67	10.67	10.67	0.00	0.00
cycles	0.50	0.50	2.25	2.25	2.25	2.25	8.00	8.00	0.00	0.00	10.67	10.67	10.67	0.00	0.00

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	NA
Longest recurrence chain latency (RecMII)	1.00

Cycles summary

Front-end	5.25
Dispatch	10.67
Data deps.	1.00
Overall L1	10.67

Vectorization ratios

all	100%
load	100%
store	100%
mul	NA (no mul vectorizable/vectorized instructions)
add-sub	NA (no add-sub vectorizable/vectorized instructions)
fma	NA (no fma vectorizable/vectorized instructions)
div/sqrt	NA (no div/sqrt vectorizable/vectorized instructions)
other	NA (no other vectorizable/vectorized instructions)

Vector efficiency ratios

all	50%
load	50%
store	50%
mul	NA (no mul vectorizable/vectorized instructions)
add-sub	NA (no add-sub vectorizable/vectorized instructions)
fma	NA (no fma vectorizable/vectorized instructions)
div/sqrt	NA (no div/sqrt vectorizable/vectorized instructions)
other	NA (no other vectorizable/vectorized instructions)

Cycles and memory resources usage

Assuming all data fit into the L1 cache, each iteration of the binary loop takes 10.67 cycles.

Front-end bottlenecks

Found no such bottlenecks.

ASM code

In the binary file, the address of the loop is: 43f074

Instruction	Nb FU	P0	P1	P2	P3	P4	P5	P6	P7	P10	P11	P12	Latency	Recip. throughput	Vectorization
LDR Q21, [X4, X0]	1	0	0	0	0	0	0	0	0	0.33	0.33	0.33	6	0.33	vect (50.0%)
ADD X14, X0, #16	1	0	0	0.25	0.25	0.25	0.25	0	0	0	0	0	1	0.25	N/A
ADD X28, X0, #32	1	0	0	0.25	0.25	0.25	0.25	0	0	0	0	0	1	0.25	N/A
ADD X27, X0, #48	1	0	0	0.25	0.25	0.25	0.25	0	0	0	0	0	1	0.25	N/A
ADD X26, X0, #64	1	0	0	0.25	0.25	0.25	0.25	0	0	0	0	0	1	0.25	N/A
ADD X25, X0, #80	1	0	0	0.25	0.25	0.25	0.25	0	0	0	0	0	1	0.25	N/A
ADD X23, X0, #96	1	0	0	0.25	0.25	0.25	0.25	0	0	0	0	0	1	0.25	N/A
ADD X19, X0, #112	1	0	0	0.25	0.25	0.25	0.25	0	0	0	0	0	1	0.25	N/A
STR Q21, [X3, X0]	1	0	0	0	0	0	0	0.50	0.50	0.50	0.50	0	2	0.50	vect (50.0%)
LDR Q22, [X2, X0]	1	0	0	0	0	0	0	0	0	0.33	0.33	0.33	6	0.33	vect (50.0%)
STR Q22, [X1, X0]	1	0	0	0	0	0	0	0.50	0.50	0.50	0.50	0	2	0.50	vect (50.0%)
ADD X0, X0, #128	1	0	0	0.25	0.25	0.25	0.25	0	0	0	0	0	1	0.25	N/A
LDR Q23, [X4, X14]	1	0	0	0	0	0	0	0	0	0.33	0.33	0.33	6	0.33	vect (50.0%)
STR Q23, [X3, X14]	1	0	0	0	0	0	0	0.50	0.50	0.50	0.50	0	2	0.50	vect (50.0%)
LDR Q24, [X2, X14]	1	0	0	0	0	0	0	0	0	0.33	0.33	0.33	6	0.33	vect (50.0%)
STR Q24, [X1, X14]	1	0	0	0	0	0	0	0.50	0.50	0.50	0.50	0	2	0.50	vect (50.0%)
LDR Q25, [X4, X28]	1	0	0	0	0	0	0	0	0	0.33	0.33	0.33	6	0.33	vect (50.0%)
STR Q25, [X3, X28]	1	0	0	0	0	0	0	0.50	0.50	0.50	0.50	0	2	0.50	vect (50.0%)
LDR Q26, [X2, X28]	1	0	0	0	0	0	0	0	0	0.33	0.33	0.33	6	0.33	vect (50.0%)
STR Q26, [X1, X28]	1	0	0	0	0	0	0	0.50	0.50	0.50	0.50	0	2	0.50	vect (50.0%)
LDR Q27, [X4, X27]	1	0	0	0	0	0	0	0	0	0.33	0.33	0.33	6	0.33	vect (50.0%)
STR Q27, [X3, X27]	1	0	0	0	0	0	0	0.50	0.50	0.50	0.50	0	2	0.50	vect (50.0%)
LDR Q28, [X2, X27]	1	0	0	0	0	0	0	0	0	0.33	0.33	0.33	6	0.33	vect (50.0%)
STR Q28, [X1, X27]	1	0	0	0	0	0	0	0.50	0.50	0.50	0.50	0	2	0.50	vect (50.0%)
LDR Q29, [X4, X26]	1	0	0	0	0	0	0	0	0	0.33	0.33	0.33	6	0.33	vect (50.0%)
STR Q29, [X3, X26]	1	0	0	0	0	0	0	0.50	0.50	0.50	0.50	0	2	0.50	vect (50.0%)
LDR Q30, [X2, X26]	1	0	0	0	0	0	0	0	0	0.33	0.33	0.33	6	0.33	vect (50.0%)
STR Q30, [X1, X26]	1	0	0	0	0	0	0	0.50	0.50	0.50	0.50	0	2	0.50	vect (50.0%)
LDR Q31, [X4, X25]	1	0	0	0	0	0	0	0	0	0.33	0.33	0.33	6	0.33	vect (50.0%)
STR Q31, [X3, X25]	1	0	0	0	0	0	0	0.50	0.50	0.50	0.50	0	2	0.50	vect (50.0%)
LDR Q0, [X2, X25]	1	0	0	0	0	0	0	0	0	0.33	0.33	0.33	6	0.33	vect (50.0%)
STR Q0, [X1, X25]	1	0	0	0	0	0	0	0.50	0.50	0.50	0.50	0	2	0.50	vect (50.0%)
LDR Q1, [X4, X23]	1	0	0	0	0	0	0	0	0	0.33	0.33	0.33	6	0.33	vect (50.0%)
STR Q1, [X3, X23]	1	0	0	0	0	0	0	0.50	0.50	0.50	0.50	0	2	0.50	vect (50.0%)
LDR Q2, [X2, X23]	1	0	0	0	0	0	0	0	0	0.33	0.33	0.33	6	0.33	vect (50.0%)
STR Q2, [X1, X23]	1	0	0	0	0	0	0	0.50	0.50	0.50	0.50	0	2	0.50	vect (50.0%)
LDR Q3, [X4, X19]	1	0	0	0	0	0	0	0	0	0.33	0.33	0.33	6	0.33	vect (50.0%)
STR Q3, [X3, X19]	1	0	0	0	0	0	0	0.50	0.50	0.50	0.50	0	2	0.50	vect (50.0%)
LDR Q4, [X2, X19]	1	0	0	0	0	0	0	0	0	0.33	0.33	0.33	6	0.33	vect (50.0%)
STR Q4, [X1, X19]	1	0	0	0	0	0	0	0.50	0.50	0.50	0.50	0	2	0.50	vect (50.0%)
CMP X8, X0	1	0	0	0.25	0.25	0.25	0.25	0	0	0	0	0	1	0.33	N/A
B.NE 43f074 <_Z13revert_kerneliiiiRN6clover8Buffer2DIdEES2_S2_S2_._omp_fn.0+0x214>	1	0.50	0.50	0	0	0	0	0	0	0	0	0	1	0.50	N/A

Function	revert_kernel(int, int, int, int, clover::Buffer2D&, clover::Buffer2D&, clover::Buffer2D&, clover::Buffer2D&) [clone ._omp_fn.0]
Source file and lines	revert.cpp:37-38
Module	exec

The loop 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/revert.cpp:37-38

The related source loop is not unrolled or unrolled with no peel/tail loop.

gain
potential
hint
expert

Vectorization

Details

No data for this section

Slow data structures access

Detected data structures (typically arrays) that cannot be efficiently read/written

Details

Constant non-unit stride: 4 occurrence(s)

Non-unit stride (uncontiguous) accesses are not efficiently using data caches

Workaround

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

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

The binary loop does not contain any FP arithmetical operations. The binary loop does not load or store any data.

General properties

nb instructions	42
nb uops	42
loop length	168
used w registers	0
used x registers	13
used b registers	0
used h registers	0
used s registers	0
used d registers	0
used q registers	16
used v registers	0
used z registers	0
nb stack references	0

Front-end

MACRO FUSION NOT POSSIBLE FIT IN UOP CACHE

micro-operation queue	5.25 cycles
front end	5.25 cycles

Back-end

	P0	P1	P2	P3	P4	P5	P6	P7	P8	P9	P10	P11	P12	P13	P14
uops	0.50	0.50	2.25	2.25	2.25	2.25	8.00	8.00	0.00	0.00	10.67	10.67	10.67	0.00	0.00
cycles	0.50	0.50	2.25	2.25	2.25	2.25	8.00	8.00	0.00	0.00	10.67	10.67	10.67	0.00	0.00

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	NA
Longest recurrence chain latency (RecMII)	1.00

Cycles summary

Front-end	5.25
Dispatch	10.67
Data deps.	1.00
Overall L1	10.67

Vectorization ratios

all	100%
load	100%
store	100%
mul	NA (no mul vectorizable/vectorized instructions)
add-sub	NA (no add-sub vectorizable/vectorized instructions)
fma	NA (no fma vectorizable/vectorized instructions)
div/sqrt	NA (no div/sqrt vectorizable/vectorized instructions)
other	NA (no other vectorizable/vectorized instructions)

Vector efficiency ratios

all	50%
load	50%
store	50%
mul	NA (no mul vectorizable/vectorized instructions)
add-sub	NA (no add-sub vectorizable/vectorized instructions)
fma	NA (no fma vectorizable/vectorized instructions)
div/sqrt	NA (no div/sqrt vectorizable/vectorized instructions)
other	NA (no other vectorizable/vectorized instructions)

Cycles and memory resources usage

Assuming all data fit into the L1 cache, each iteration of the binary loop takes 10.67 cycles.

Front-end bottlenecks

Found no such bottlenecks.

ASM code

In the binary file, the address of the loop is: 43f074

Instruction	Nb FU	P0	P1	P2	P3	P4	P5	P6	P7	P10	P11	P12	Latency	Recip. throughput	Vectorization
LDR Q21, [X4, X0]	1	0	0	0	0	0	0	0	0	0.33	0.33	0.33	6	0.33	vect (50.0%)
ADD X14, X0, #16	1	0	0	0.25	0.25	0.25	0.25	0	0	0	0	0	1	0.25	N/A
ADD X28, X0, #32	1	0	0	0.25	0.25	0.25	0.25	0	0	0	0	0	1	0.25	N/A
ADD X27, X0, #48	1	0	0	0.25	0.25	0.25	0.25	0	0	0	0	0	1	0.25	N/A
ADD X26, X0, #64	1	0	0	0.25	0.25	0.25	0.25	0	0	0	0	0	1	0.25	N/A
ADD X25, X0, #80	1	0	0	0.25	0.25	0.25	0.25	0	0	0	0	0	1	0.25	N/A
ADD X23, X0, #96	1	0	0	0.25	0.25	0.25	0.25	0	0	0	0	0	1	0.25	N/A
ADD X19, X0, #112	1	0	0	0.25	0.25	0.25	0.25	0	0	0	0	0	1	0.25	N/A
STR Q21, [X3, X0]	1	0	0	0	0	0	0	0.50	0.50	0.50	0.50	0	2	0.50	vect (50.0%)
LDR Q22, [X2, X0]	1	0	0	0	0	0	0	0	0	0.33	0.33	0.33	6	0.33	vect (50.0%)
STR Q22, [X1, X0]	1	0	0	0	0	0	0	0.50	0.50	0.50	0.50	0	2	0.50	vect (50.0%)
ADD X0, X0, #128	1	0	0	0.25	0.25	0.25	0.25	0	0	0	0	0	1	0.25	N/A
LDR Q23, [X4, X14]	1	0	0	0	0	0	0	0	0	0.33	0.33	0.33	6	0.33	vect (50.0%)
STR Q23, [X3, X14]	1	0	0	0	0	0	0	0.50	0.50	0.50	0.50	0	2	0.50	vect (50.0%)
LDR Q24, [X2, X14]	1	0	0	0	0	0	0	0	0	0.33	0.33	0.33	6	0.33	vect (50.0%)
STR Q24, [X1, X14]	1	0	0	0	0	0	0	0.50	0.50	0.50	0.50	0	2	0.50	vect (50.0%)
LDR Q25, [X4, X28]	1	0	0	0	0	0	0	0	0	0.33	0.33	0.33	6	0.33	vect (50.0%)
STR Q25, [X3, X28]	1	0	0	0	0	0	0	0.50	0.50	0.50	0.50	0	2	0.50	vect (50.0%)
LDR Q26, [X2, X28]	1	0	0	0	0	0	0	0	0	0.33	0.33	0.33	6	0.33	vect (50.0%)
STR Q26, [X1, X28]	1	0	0	0	0	0	0	0.50	0.50	0.50	0.50	0	2	0.50	vect (50.0%)
LDR Q27, [X4, X27]	1	0	0	0	0	0	0	0	0	0.33	0.33	0.33	6	0.33	vect (50.0%)
STR Q27, [X3, X27]	1	0	0	0	0	0	0	0.50	0.50	0.50	0.50	0	2	0.50	vect (50.0%)
LDR Q28, [X2, X27]	1	0	0	0	0	0	0	0	0	0.33	0.33	0.33	6	0.33	vect (50.0%)
STR Q28, [X1, X27]	1	0	0	0	0	0	0	0.50	0.50	0.50	0.50	0	2	0.50	vect (50.0%)
LDR Q29, [X4, X26]	1	0	0	0	0	0	0	0	0	0.33	0.33	0.33	6	0.33	vect (50.0%)
STR Q29, [X3, X26]	1	0	0	0	0	0	0	0.50	0.50	0.50	0.50	0	2	0.50	vect (50.0%)
LDR Q30, [X2, X26]	1	0	0	0	0	0	0	0	0	0.33	0.33	0.33	6	0.33	vect (50.0%)
STR Q30, [X1, X26]	1	0	0	0	0	0	0	0.50	0.50	0.50	0.50	0	2	0.50	vect (50.0%)
LDR Q31, [X4, X25]	1	0	0	0	0	0	0	0	0	0.33	0.33	0.33	6	0.33	vect (50.0%)
STR Q31, [X3, X25]	1	0	0	0	0	0	0	0.50	0.50	0.50	0.50	0	2	0.50	vect (50.0%)
LDR Q0, [X2, X25]	1	0	0	0	0	0	0	0	0	0.33	0.33	0.33	6	0.33	vect (50.0%)
STR Q0, [X1, X25]	1	0	0	0	0	0	0	0.50	0.50	0.50	0.50	0	2	0.50	vect (50.0%)
LDR Q1, [X4, X23]	1	0	0	0	0	0	0	0	0	0.33	0.33	0.33	6	0.33	vect (50.0%)
STR Q1, [X3, X23]	1	0	0	0	0	0	0	0.50	0.50	0.50	0.50	0	2	0.50	vect (50.0%)
LDR Q2, [X2, X23]	1	0	0	0	0	0	0	0	0	0.33	0.33	0.33	6	0.33	vect (50.0%)
STR Q2, [X1, X23]	1	0	0	0	0	0	0	0.50	0.50	0.50	0.50	0	2	0.50	vect (50.0%)
LDR Q3, [X4, X19]	1	0	0	0	0	0	0	0	0	0.33	0.33	0.33	6	0.33	vect (50.0%)
STR Q3, [X3, X19]	1	0	0	0	0	0	0	0.50	0.50	0.50	0.50	0	2	0.50	vect (50.0%)
LDR Q4, [X2, X19]	1	0	0	0	0	0	0	0	0	0.33	0.33	0.33	6	0.33	vect (50.0%)
STR Q4, [X1, X19]	1	0	0	0	0	0	0	0.50	0.50	0.50	0.50	0	2	0.50	vect (50.0%)
CMP X8, X0	1	0	0	0.25	0.25	0.25	0.25	0	0	0	0	0	1	0.33	N/A
B.NE 43f074 <_Z13revert_kerneliiiiRN6clover8Buffer2DIdEES2_S2_S2_._omp_fn.0+0x214>	1	0.50	0.50	0	0	0	0	0	0	0	0	0	1	0.50	N/A

▶Scalability Runs Description

Run 1x1	Number processes: 1Number nodes: NARun Command: <executable>MPI Command: mpirun -n <number_processes> --bind-to core --map-by package:PE=64 --rank-by fill --report-bindings Dataset: Run Directory: /home/eoseret/qaas/qaas_runs/178-219-7589/intel/CloverLeaf2.0-CXX/run/oneview_runs/multicore/gcc_4/oneview_run_1782227431OMP_PROC_BIND: spreadOMP_DISPLAY_AFFINITY: TRUEOMP_AFFINITY_FORMAT: 'OMP: pid %P tid %i thread %n bound to OS proc set {%A}'OMP_DISPLAY_ENV: TRUEOMP_NUM_THREADS: 1OMP_PLACES: threads
Run 1x2	Number processes: 1Run Command: <executable>MPI Command: mpirun -n <number_processes> --bind-to core --map-by package:PE=64 --rank-by fill --report-bindings Dataset: Run Directory: /home/eoseret/qaas/qaas_runs/178-219-7589/intel/CloverLeaf2.0-CXX/run/oneview_runs/multicore/gcc_4/oneview_run_1782227431OMP_NUM_THREADS: 2OMP_PROC_BIND: spreadOMP_DISPLAY_AFFINITY: TRUEOMP_AFFINITY_FORMAT: 'OMP: pid %P tid %i thread %n bound to OS proc set {%A}'OMP_DISPLAY_ENV: TRUEOMP_PLACES: threads
Run 1x4	Number processes: 1Run Command: <executable>MPI Command: mpirun -n <number_processes> --bind-to core --map-by package:PE=64 --rank-by fill --report-bindings Dataset: Run Directory: /home/eoseret/qaas/qaas_runs/178-219-7589/intel/CloverLeaf2.0-CXX/run/oneview_runs/multicore/gcc_4/oneview_run_1782227431OMP_NUM_THREADS: 4OMP_PROC_BIND: spreadOMP_DISPLAY_AFFINITY: TRUEOMP_AFFINITY_FORMAT: 'OMP: pid %P tid %i thread %n bound to OS proc set {%A}'OMP_DISPLAY_ENV: TRUEOMP_PLACES: threads
Run 1x8	Number processes: 1Run Command: <executable>MPI Command: mpirun -n <number_processes> --bind-to core --map-by package:PE=64 --rank-by fill --report-bindings Dataset: Run Directory: /home/eoseret/qaas/qaas_runs/178-219-7589/intel/CloverLeaf2.0-CXX/run/oneview_runs/multicore/gcc_4/oneview_run_1782227431OMP_NUM_THREADS: 8OMP_PROC_BIND: spreadOMP_DISPLAY_AFFINITY: TRUEOMP_AFFINITY_FORMAT: 'OMP: pid %P tid %i thread %n bound to OS proc set {%A}'OMP_DISPLAY_ENV: TRUEOMP_PLACES: threads
Run 1x16	Number processes: 1Run Command: <executable>MPI Command: mpirun -n <number_processes> --bind-to core --map-by package:PE=64 --rank-by fill --report-bindings Dataset: Run Directory: /home/eoseret/qaas/qaas_runs/178-219-7589/intel/CloverLeaf2.0-CXX/run/oneview_runs/multicore/gcc_4/oneview_run_1782227431OMP_NUM_THREADS: 16OMP_PROC_BIND: spreadOMP_DISPLAY_AFFINITY: TRUEOMP_AFFINITY_FORMAT: 'OMP: pid %P tid %i thread %n bound to OS proc set {%A}'OMP_DISPLAY_ENV: TRUEOMP_PLACES: threads
Run 1x24	Number processes: 1Run Command: <executable>MPI Command: mpirun -n <number_processes> --bind-to core --map-by package:PE=64 --rank-by fill --report-bindings Dataset: Run Directory: /home/eoseret/qaas/qaas_runs/178-219-7589/intel/CloverLeaf2.0-CXX/run/oneview_runs/multicore/gcc_4/oneview_run_1782227431OMP_NUM_THREADS: 24OMP_PROC_BIND: spreadOMP_DISPLAY_AFFINITY: TRUEOMP_AFFINITY_FORMAT: 'OMP: pid %P tid %i thread %n bound to OS proc set {%A}'OMP_DISPLAY_ENV: TRUEOMP_PLACES: threads
Run 1x32	Number processes: 1Run Command: <executable>MPI Command: mpirun -n <number_processes> --bind-to core --map-by package:PE=64 --rank-by fill --report-bindings Dataset: Run Directory: /home/eoseret/qaas/qaas_runs/178-219-7589/intel/CloverLeaf2.0-CXX/run/oneview_runs/multicore/gcc_4/oneview_run_1782227431OMP_NUM_THREADS: 32OMP_PROC_BIND: spreadOMP_DISPLAY_AFFINITY: TRUEOMP_AFFINITY_FORMAT: 'OMP: pid %P tid %i thread %n bound to OS proc set {%A}'OMP_DISPLAY_ENV: TRUEOMP_PLACES: threads
Run 1x40	Number processes: 1Run Command: <executable>MPI Command: mpirun -n <number_processes> --bind-to core --map-by package:PE=64 --rank-by fill --report-bindings Dataset: Run Directory: /home/eoseret/qaas/qaas_runs/178-219-7589/intel/CloverLeaf2.0-CXX/run/oneview_runs/multicore/gcc_4/oneview_run_1782227431OMP_NUM_THREADS: 40OMP_PROC_BIND: spreadOMP_DISPLAY_AFFINITY: TRUEOMP_AFFINITY_FORMAT: 'OMP: pid %P tid %i thread %n bound to OS proc set {%A}'OMP_DISPLAY_ENV: TRUEOMP_PLACES: threads
Run 1x48	Number processes: 1Run Command: <executable>MPI Command: mpirun -n <number_processes> --bind-to core --map-by package:PE=64 --rank-by fill --report-bindings Dataset: Run Directory: /home/eoseret/qaas/qaas_runs/178-219-7589/intel/CloverLeaf2.0-CXX/run/oneview_runs/multicore/gcc_4/oneview_run_1782227431OMP_NUM_THREADS: 48OMP_PROC_BIND: spreadOMP_DISPLAY_AFFINITY: TRUEOMP_AFFINITY_FORMAT: 'OMP: pid %P tid %i thread %n bound to OS proc set {%A}'OMP_DISPLAY_ENV: TRUEOMP_PLACES: threads
Run 1x56	Number processes: 1Run Command: <executable>MPI Command: mpirun -n <number_processes> --bind-to core --map-by package:PE=64 --rank-by fill --report-bindings Dataset: Run Directory: /home/eoseret/qaas/qaas_runs/178-219-7589/intel/CloverLeaf2.0-CXX/run/oneview_runs/multicore/gcc_4/oneview_run_1782227431OMP_NUM_THREADS: 56OMP_PROC_BIND: spreadOMP_DISPLAY_AFFINITY: TRUEOMP_AFFINITY_FORMAT: 'OMP: pid %P tid %i thread %n bound to OS proc set {%A}'OMP_DISPLAY_ENV: TRUEOMP_PLACES: threads
Run 1x64	Number processes: 1Run Command: <executable>MPI Command: mpirun -n <number_processes> --bind-to core --map-by package:PE=64 --rank-by fill --report-bindings Dataset: Run Directory: /home/eoseret/qaas/qaas_runs/178-219-7589/intel/CloverLeaf2.0-CXX/run/oneview_runs/multicore/gcc_4/oneview_run_1782227431OMP_NUM_THREADS: 64OMP_PROC_BIND: spreadOMP_DISPLAY_AFFINITY: TRUEOMP_AFFINITY_FORMAT: 'OMP: pid %P tid %i thread %n bound to OS proc set {%A}'OMP_DISPLAY_ENV: TRUEOMP_PLACES: threads

(1x1) Efficiency	(1x1) Potential Speed-Up (%)	(1x2) Efficiency	(1x2) Potential Speed-Up (%)	(1x4) Efficiency	(1x4) Potential Speed-Up (%)	(1x8) Efficiency	(1x8) Potential Speed-Up (%)	(1x16) Efficiency	(1x16) Potential Speed-Up (%)	(1x24) Efficiency	(1x24) Potential Speed-Up (%)	(1x32) Efficiency	(1x32) Potential Speed-Up (%)	(1x40) Efficiency	(1x40) Potential Speed-Up (%)	(1x48) Efficiency	(1x48) Potential Speed-Up (%)	(1x56) Efficiency	(1x56) Potential Speed-Up (%)	(1x64) Efficiency	(1x64) Potential Speed-Up (%)
1	0	0.96	0.04	0.85	0.15	0.56	0.61	0.28	1.3	0.19	1.54	0.15	1.67	0.12	1.79	0.1	1.85	0.09	1.89	0.07	1.92

Speed-Up and Efficiency

▶Detailed Speed-Up and Efficiency

Run	Number of threads	Efficiency (ideal is 1)	Speedup	Ideal Speedup	Time (s)	Coverage (%)
1x1	1	1	1	1	13.380001068115	0.90021598339081
1x2	2	0.96	1.92	2	7.0300006866455	0.92737966775894
1x4	4	0.85	3.4	4	3.9800002574921	1.0253633260727
1x8	8	0.56	4.47	8	2.9600005149841	1.3775734901428
1x16	16	0.28	4.43	16	2.9500005245209	1.7937940359116
1x24	24	0.19	4.49	24	2.9300003051758	1.8997887372971
1x32	32	0.15	4.72	32	2.7949998378754	1.961311340332
1x40	40	0.12	4.81	40	2.7349998950958	2.030380487442
1x48	48	0.1	4.84	48	2.7349996566772	2.055513381958
1x56	56	0.09	4.81	56	2.7400000095367	2.0716030597687
1x64	64	0.07	4.79	64	2.7799999713898	2.0778527259827

Report Configuration

Vectorization

Details

Slow data structures access

Details

Workaround

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

General properties

Front-end

Back-end

Cycles summary

Vectorization ratios

Vector efficiency ratios

Cycles and memory resources usage

Front-end bottlenecks

ASM code

Vectorization

Details

Slow data structures access

Details

Workaround

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

General properties

Front-end

Back-end

Cycles summary

Vectorization ratios

Vector efficiency ratios

Cycles and memory resources usage

Front-end bottlenecks

ASM code

▶Scalability Runs Description

▼Columns Filter

Speed-Up and Efficiency

▶Detailed Speed-Up and Efficiency