OV - exec - Loop 63

	Loop Id: 63	Module: exec	Source: haloExchange.c:633-642	Coverage: 0.04%

0x408b70 VPBROADCASTQ	%R13,%ZMM9

0x408b76 VPMULLQ	%ZMM0,%ZMM9,%ZMM9

0x408b7c VPADDQ	%ZMM1,%ZMM9,%ZMM10

0x408b82 VPADDQ	%ZMM2,%ZMM9,%ZMM9

0x408b88 KXNORW	%K0,%K0,%K1

0x408b8c VPXOR	%XMM11,%XMM11,%XMM11

0x408b91 VPGATHERQD	(%RBX,%ZMM9,1),%YMM11{%K1}    [4]

0x408b98 KXNORW	%K0,%K0,%K1

0x408b9c VPXOR	%XMM12,%XMM12,%XMM12

0x408ba1 VPGATHERQD	(%RBX,%ZMM10,1),%YMM12{%K1}    [4]

0x408ba8 VINSERTI64X4	$0x1,%YMM11,%ZMM12,%ZMM11

0x408baf VMOVDQU64	%ZMM11,(%RDI,%R13,4)    [2]

0x408bb6 KXNORW	%K0,%K0,%K1

0x408bba VPXOR	%XMM11,%XMM11,%XMM11

0x408bbf VPGATHERQD	0x4(%RBX,%ZMM9,1),%YMM11{%K1}    [4]

0x408bc7 KXNORW	%K0,%K0,%K1

0x408bcb VPXOR	%XMM12,%XMM12,%XMM12

0x408bd0 VPGATHERQD	0x4(%RBX,%ZMM10,1),%YMM12{%K1}    [4]

0x408bd8 VINSERTI64X4	$0x1,%YMM11,%ZMM12,%ZMM11

0x408bdf VMOVDQU64	%ZMM11,(%R8,%R13,4)    [1]

0x408be6 VPXOR	%XMM11,%XMM11,%XMM11

0x408beb KXNORW	%K0,%K0,%K1

0x408bef VGATHERQPD	0x8(%RBX,%ZMM9,1),%ZMM11{%K1}    [4]

0x408bf7 VPXOR	%XMM12,%XMM12,%XMM12

0x408bfc KXNORW	%K0,%K0,%K1

0x408c00 VGATHERQPD	0x8(%RBX,%ZMM10,1),%ZMM12{%K1}    [4]

0x408c08 VXORPD	%XMM13,%XMM13,%XMM13

0x408c0d KXNORW	%K0,%K0,%K1

0x408c11 VGATHERQPD	0x10(%RBX,%ZMM9,1),%ZMM13{%K1}    [4]

0x408c19 VXORPD	%XMM14,%XMM14,%XMM14

0x408c1e KXNORW	%K0,%K0,%K1

0x408c22 VGATHERQPD	0x10(%RBX,%ZMM10,1),%ZMM14{%K1}    [4]

0x408c2a VXORPD	%XMM15,%XMM15,%XMM15

0x408c2f KXNORW	%K0,%K0,%K1

0x408c33 VGATHERQPD	0x18(%RBX,%ZMM10,1),%ZMM15{%K1}    [4]

0x408c3b VXORPD	%XMM16,%XMM16,%XMM16

0x408c41 KXNORW	%K0,%K0,%K1

0x408c45 VGATHERQPD	0x18(%RBX,%ZMM9,1),%ZMM16{%K1}    [4]

0x408c4d VMOVAPD	%ZMM14,%ZMM17

0x408c53 VPERMT2PD	%ZMM12,%ZMM3,%ZMM17

0x408c59 VMOVAPD	%ZMM12,%ZMM18

0x408c5f VPERMT2PD	%ZMM14,%ZMM4,%ZMM18

0x408c65 VMOVAPD	%ZMM13,%ZMM19

0x408c6b VPERMT2PD	%ZMM11,%ZMM3,%ZMM19

0x408c71 VMOVAPD	%ZMM11,%ZMM20

0x408c77 VPERMT2PD	%ZMM13,%ZMM4,%ZMM20

0x408c7d VPERMT2PD	%ZMM14,%ZMM5,%ZMM12

0x408c83 VPERMT2PD	%ZMM13,%ZMM5,%ZMM11

0x408c89 VPERMT2PD	%ZMM16,%ZMM6,%ZMM11

0x408c8f VPERMT2PD	%ZMM15,%ZMM6,%ZMM12

0x408c95 VPERMT2PD	%ZMM16,%ZMM7,%ZMM20

0x408c9b VPERMT2PD	%ZMM16,%ZMM8,%ZMM19

0x408ca1 VPERMT2PD	%ZMM15,%ZMM7,%ZMM18

0x408ca7 VPERMT2PD	%ZMM15,%ZMM8,%ZMM17

0x408cad VMOVUPD	%ZMM17,0x80(%RDX,%R9,1)    [5]

0x408cb5 VMOVUPD	%ZMM18,(%RDX,%R9,1)    [5]

0x408cbc VMOVUPD	%ZMM19,0x140(%RDX,%R9,1)    [5]

0x408cc4 VMOVUPD	%ZMM20,0xc0(%RDX,%R9,1)    [5]

0x408ccc VMOVUPD	%ZMM12,0x40(%RDX,%R9,1)    [5]

0x408cd4 VMOVUPD	%ZMM11,0x100(%RDX,%R9,1)    [5]

0x408cdc VXORPD	%XMM11,%XMM11,%XMM11

0x408ce1 KXNORW	%K0,%K0,%K1

0x408ce5 VGATHERQPD	0x20(%RBX,%ZMM9,1),%ZMM11{%K1}    [4]

0x408ced VXORPD	%XMM12,%XMM12,%XMM12

0x408cf2 KXNORW	%K0,%K0,%K1

0x408cf6 VGATHERQPD	0x20(%RBX,%ZMM10,1),%ZMM12{%K1}    [4]

0x408cfe VXORPD	%XMM13,%XMM13,%XMM13

0x408d03 KXNORW	%K0,%K0,%K1

0x408d07 VGATHERQPD	0x28(%RBX,%ZMM9,1),%ZMM13{%K1}    [4]

0x408d0f VXORPD	%XMM14,%XMM14,%XMM14

0x408d14 KXNORW	%K0,%K0,%K1

0x408d18 VGATHERQPD	0x28(%RBX,%ZMM10,1),%ZMM14{%K1}    [4]

0x408d20 VXORPD	%XMM15,%XMM15,%XMM15

0x408d25 KXNORW	%K0,%K0,%K1

0x408d29 VGATHERQPD	0x30(%RBX,%ZMM10,1),%ZMM15{%K1}    [4]

0x408d31 VXORPD	%XMM10,%XMM10,%XMM10

0x408d36 KXNORW	%K0,%K0,%K1

0x408d3a VGATHERQPD	0x30(%RBX,%ZMM9,1),%ZMM10{%K1}    [4]

0x408d42 VMOVAPD	%ZMM14,%ZMM9

0x408d48 VPERMT2PD	%ZMM12,%ZMM3,%ZMM9

0x408d4e VMOVAPD	%ZMM12,%ZMM16

0x408d54 VPERMT2PD	%ZMM14,%ZMM4,%ZMM16

0x408d5a VMOVAPD	%ZMM13,%ZMM17

0x408d60 VPERMT2PD	%ZMM11,%ZMM3,%ZMM17

0x408d66 VMOVAPD	%ZMM11,%ZMM18

0x408d6c VPERMT2PD	%ZMM13,%ZMM4,%ZMM18

0x408d72 VPERMT2PD	%ZMM14,%ZMM5,%ZMM12

0x408d78 VPERMT2PD	%ZMM13,%ZMM5,%ZMM11

0x408d7e VPERMT2PD	%ZMM10,%ZMM6,%ZMM11

0x408d84 VPERMT2PD	%ZMM15,%ZMM6,%ZMM12

0x408d8a VPERMT2PD	%ZMM10,%ZMM7,%ZMM18

0x408d90 VPERMT2PD	%ZMM10,%ZMM8,%ZMM17

0x408d96 VPERMT2PD	%ZMM15,%ZMM7,%ZMM16

0x408d9c VPERMT2PD	%ZMM15,%ZMM8,%ZMM9

0x408da2 VMOVUPD	%ZMM9,0x80(%RSI,%R9,1)    [3]

0x408daa VMOVUPD	%ZMM16,(%RSI,%R9,1)    [3]

0x408db1 VMOVUPD	%ZMM17,0x140(%RSI,%R9,1)    [3]

0x408db9 VMOVUPD	%ZMM18,0xc0(%RSI,%R9,1)    [3]

0x408dc1 VMOVUPD	%ZMM12,0x40(%RSI,%R9,1)    [3]

0x408dc9 VMOVUPD	%ZMM11,0x100(%RSI,%R9,1)    [3]

0x408dd1 ADD	$0x10,%R13

0x408dd5 ADD	$0x180,%R9

0x408ddc CMP	%R14,%R13

0x408ddf JLE	408b70

/home/eoseret/qaas_runs_ZEN5/174-043-3878/intel/CoMD/build/CoMD/CoMD/src-openmp/haloExchange.c: 633 - 642

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

633:    for (int ii=begin, iTmp=0; ii<end; ++ii, ++iTmp)

634:    {

635:       atoms->gid[ii]   = tmp[iTmp].gid;

636:       atoms->iSpecies[ii] = tmp[iTmp].type;

637:       atoms->r[ii][0]  = tmp[iTmp].rx;

638:       atoms->r[ii][1]  = tmp[iTmp].ry;

639:       atoms->r[ii][2]  = tmp[iTmp].rz;

640:       atoms->p[ii][0]  = tmp[iTmp].px;

641:       atoms->p[ii][1]  = tmp[iTmp].py;

642:       atoms->p[ii][2]  = tmp[iTmp].pz;

Coverage (%)	Name	Source Location	Module
►14.01+	redistributeAtoms.extracted	timestep.c:154	exec
○	__kmp_invoke_microtask		libiomp5.so
○	__kmp_invoke_task_func		libiomp5.so
○	__kmp_launch_thread		libiomp5.so
○	_INTERNALea951ae6::__kmp_launc[...]		libiomp5.so
○	start_thread		libc.so.6
○	__GI___clone3		libc.so.6
►13.81+	redistributeAtoms.extracted	timestep.c:154	exec
○	__kmp_invoke_microtask		libiomp5.so
○	__kmp_invoke_task_func		libiomp5.so
○	__kmp_launch_thread		libiomp5.so
○	_INTERNALea951ae6::__kmp_launc[...]		libiomp5.so
○	start_thread		libc.so.6
○	__GI___clone3		libc.so.6
►12.65+	redistributeAtoms.extracted	timestep.c:154	exec
○	__kmp_invoke_microtask		libiomp5.so
○	__kmp_invoke_task_func		libiomp5.so
○	__kmp_launch_thread		libiomp5.so
○	_INTERNALea951ae6::__kmp_launc[...]		libiomp5.so
○	start_thread		libc.so.6
○	__GI___clone3		libc.so.6
►12.45+	redistributeAtoms.extracted	timestep.c:154	exec
○	__kmp_invoke_microtask		libiomp5.so
○	__kmp_invoke_task_func		libiomp5.so
○	__kmp_launch_thread		libiomp5.so
○	_INTERNALea951ae6::__kmp_launc[...]		libiomp5.so
○	start_thread		libc.so.6
○	__GI___clone3		libc.so.6
►11.87+	redistributeAtoms.extracted	timestep.c:154	exec
○	__kmp_invoke_microtask		libiomp5.so
○	__kmp_invoke_task_func		libiomp5.so
○	__kmp_launch_thread		libiomp5.so
○	_INTERNALea951ae6::__kmp_launc[...]		libiomp5.so
○	start_thread		libc.so.6
○	__GI___clone3		libc.so.6
►11.87+	redistributeAtoms.extracted	timestep.c:153	exec
○	__kmp_invoke_microtask		libiomp5.so
○	__kmp_invoke_task_func		libiomp5.so
○	__kmp_launch_thread		libiomp5.so
○	_INTERNALea951ae6::__kmp_launc[...]		libiomp5.so
○	start_thread		libc.so.6
○	__GI___clone3		libc.so.6
►9.92+	redistributeAtoms.extracted	timestep.c:154	exec
○	__kmp_invoke_microtask		libiomp5.so
○	__kmp_invoke_task_func		libiomp5.so
○	__kmp_launch_thread		libiomp5.so
○	_INTERNALea951ae6::__kmp_launc[...]		libiomp5.so
○	start_thread		libc.so.6
○	__GI___clone3		libc.so.6
►8.76+	redistributeAtoms.extracted	timestep.c:154	exec
○	__kmp_invoke_microtask		libiomp5.so
○	__kmp_invoke_task_func		libiomp5.so
○	__kmp_launch_thread		libiomp5.so
○	_INTERNALea951ae6::__kmp_launc[...]		libiomp5.so
○	start_thread		libc.so.6
○	__GI___clone3		libc.so.6
►1.17+	redistributeAtoms.extracted	timestep.c:154	exec
○	__kmp_invoke_microtask		libiomp5.so
○	__kmp_invoke_task_func		libiomp5.so
○	__kmp_fork_call		libiomp5.so
○	__kmpc_fork_call		libiomp5.so
○	timestep	timestep.c:47	exec
○	main	CoMD.c:125	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	1.02
CQA speedup if FP arith vectorized	1.00
CQA speedup if fully vectorized	1.04
CQA speedup if no inter-iteration dependency	NA
CQA speedup if next bottleneck killed	1.21
Bottlenecks	micro-operation queue,
Function	sortAtomsInCell
Source	haloExchange.c:633-642
Source loop unroll info	unrolled by 16
Source loop unroll confidence level	max
Unroll/vectorization loop type	main
Unroll factor	16
CQA cycles	106.25
CQA cycles if no scalar integer	104.13
CQA cycles if FP arith vectorized	106.25
CQA cycles if fully vectorized	102.29
Front-end cycles	106.25
P0 cycles	0.50
P1 cycles	0.50
P2 cycles	0.50
P3 cycles	0.50
P4 cycles	0.50
P5 cycles	0.50
P6 cycles	35.50
P7 cycles	35.50
P8 cycles	35.50
P9 cycles	35.50
P10 cycles	65.50
P11 cycles	65.50
P12 cycles	65.50
P13 cycles	65.50
P14 cycles	88.00
P15 cycles	88.00
DIV/SQRT cycles	0.00
Inter-iter dependencies cycles	1
FE+BE cycles (UFS)	NA
Stall cycles (UFS)	NA
Nb insns	104.00
Nb uops	850.00
Nb loads	16.00
Nb stores	14.00
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	16.87
Bytes prefetched	0.00
Bytes loaded	896.00
Bytes stored	896.00
Stride 0	0.00
Stride 1	4.00
Stride n	0.00
Stride unknown	1.00
Stride indirect	0.00
Vectorization ratio all	98.81
Vectorization ratio load	100.00
Vectorization ratio store	100.00
Vectorization ratio mul	100.00
Vectorization ratio add_sub	100.00
Vectorization ratio fma	NA
Vectorization ratio div_sqrt	NA
Vectorization ratio other	98.51
Vector-efficiency ratio all	81.10
Vector-efficiency ratio load	87.50
Vector-efficiency ratio store	100.00
Vector-efficiency ratio mul	100.00
Vector-efficiency ratio add_sub	100.00
Vector-efficiency ratio fma	NA
Vector-efficiency ratio div_sqrt	NA
Vector-efficiency ratio other	76.31

Metric	Value
CQA speedup if no scalar integer	1.02
CQA speedup if FP arith vectorized	1.00
CQA speedup if fully vectorized	1.04
CQA speedup if no inter-iteration dependency	NA
CQA speedup if next bottleneck killed	1.21
Bottlenecks	micro-operation queue,
Function	sortAtomsInCell
Source	haloExchange.c:633-642
Source loop unroll info	unrolled by 16
Source loop unroll confidence level	max
Unroll/vectorization loop type	main
Unroll factor	16
CQA cycles	106.25
CQA cycles if no scalar integer	104.13
CQA cycles if FP arith vectorized	106.25
CQA cycles if fully vectorized	102.29
Front-end cycles	106.25
P0 cycles	0.50
P1 cycles	0.50
P2 cycles	0.50
P3 cycles	0.50
P4 cycles	0.50
P5 cycles	0.50
P6 cycles	35.50
P7 cycles	35.50
P8 cycles	35.50
P9 cycles	35.50
P10 cycles	65.50
P11 cycles	65.50
P12 cycles	65.50
P13 cycles	65.50
P14 cycles	88.00
P15 cycles	88.00
DIV/SQRT cycles	0.00
Inter-iter dependencies cycles	1
FE+BE cycles (UFS)	NA
Stall cycles (UFS)	NA
Nb insns	104.00
Nb uops	850.00
Nb loads	16.00
Nb stores	14.00
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	16.87
Bytes prefetched	0.00
Bytes loaded	896.00
Bytes stored	896.00
Stride 0	0.00
Stride 1	4.00
Stride n	0.00
Stride unknown	1.00
Stride indirect	0.00
Vectorization ratio all	98.81
Vectorization ratio load	100.00
Vectorization ratio store	100.00
Vectorization ratio mul	100.00
Vectorization ratio add_sub	100.00
Vectorization ratio fma	NA
Vectorization ratio div_sqrt	NA
Vectorization ratio other	98.51
Vector-efficiency ratio all	81.10
Vector-efficiency ratio load	87.50
Vector-efficiency ratio store	100.00
Vector-efficiency ratio mul	100.00
Vector-efficiency ratio add_sub	100.00
Vector-efficiency ratio fma	NA
Vector-efficiency ratio div_sqrt	NA
Vector-efficiency ratio other	76.31

Path /

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

Function	sortAtomsInCell
Source file and lines	haloExchange.c:633-642
Module	exec

The loop is defined in /home/eoseret/qaas_runs_ZEN5/174-043-3878/intel/CoMD/build/CoMD/CoMD/src-openmp/haloExchange.c:633-642.

It is main loop of related source loop which is unrolled by 16 (including vectorization).

gain
potential
hint
expert

Vectorization

Your loop is highly vectorized. 81% of vector register length is used (average across all SSE/AVX instructions). By fully vectorizing your loop, you can lower the cost of an iteration from 106.25 to 102.29 cycles (1.04x speedup).

Details

98% of SSE/AVX instructions are used in vector version (process two or more data elements in vector registers):

98% of SSE/AVX 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 loop can use their full power.

Workaround

Pass to your compiler a micro-architecture specialization option:
- use march=native
Use vector aligned instructions:
1. align your arrays on 64 bytes boundaries: replace { void *p = malloc (size); } with { void *p; posix_memalign (&p, 64, size); }.
2. inform your compiler that your arrays are vector aligned: if array 'foo' is 64 bytes-aligned, define a pointer 'p_foo' as __builtin_assume_aligned (foo, 64) and use it instead of 'foo' in the loop.

Execution units bottlenecks

Found no such bottlenecks but see expert reports for more complex bottlenecks.

No data for this section

Complex instructions

Detected COMPLEX INSTRUCTIONS.

Details

These instructions generate more than one micro-operation and only one of them can be decoded during a cycle and the extra micro-operations increase pressure on execution units.

VGATHERQPD: 12 occurrences►
- /home/eoseret/qaas_runs_ZEN5/174-043-3878/intel/CoMD/build/CoMD/CoMD/src-openmp/haloExchange.c:637
- /home/eoseret/qaas_runs_ZEN5/174-043-3878/intel/CoMD/build/CoMD/CoMD/src-openmp/haloExchange.c:637
- /home/eoseret/qaas_runs_ZEN5/174-043-3878/intel/CoMD/build/CoMD/CoMD/src-openmp/haloExchange.c:638
- /home/eoseret/qaas_runs_ZEN5/174-043-3878/intel/CoMD/build/CoMD/CoMD/src-openmp/haloExchange.c:638
- /home/eoseret/qaas_runs_ZEN5/174-043-3878/intel/CoMD/build/CoMD/CoMD/src-openmp/haloExchange.c:639
- /home/eoseret/qaas_runs_ZEN5/174-043-3878/intel/CoMD/build/CoMD/CoMD/src-openmp/haloExchange.c:639
- /home/eoseret/qaas_runs_ZEN5/174-043-3878/intel/CoMD/build/CoMD/CoMD/src-openmp/haloExchange.c:640
- /home/eoseret/qaas_runs_ZEN5/174-043-3878/intel/CoMD/build/CoMD/CoMD/src-openmp/haloExchange.c:640
- /home/eoseret/qaas_runs_ZEN5/174-043-3878/intel/CoMD/build/CoMD/CoMD/src-openmp/haloExchange.c:641
- /home/eoseret/qaas_runs_ZEN5/174-043-3878/intel/CoMD/build/CoMD/CoMD/src-openmp/haloExchange.c:641
- /home/eoseret/qaas_runs_ZEN5/174-043-3878/intel/CoMD/build/CoMD/CoMD/src-openmp/haloExchange.c:642
- /home/eoseret/qaas_runs_ZEN5/174-043-3878/intel/CoMD/build/CoMD/CoMD/src-openmp/haloExchange.c:642
VMOVDQU64: 2 occurrences►
- /home/eoseret/qaas_runs_ZEN5/174-043-3878/intel/CoMD/build/CoMD/CoMD/src-openmp/haloExchange.c:635
- /home/eoseret/qaas_runs_ZEN5/174-043-3878/intel/CoMD/build/CoMD/CoMD/src-openmp/haloExchange.c:636
VPBROADCASTQ: 1 occurrences►
- /home/eoseret/qaas_runs_ZEN5/174-043-3878/intel/CoMD/build/CoMD/CoMD/src-openmp/haloExchange.c:633
VPGATHERQD: 4 occurrences►
- /home/eoseret/qaas_runs_ZEN5/174-043-3878/intel/CoMD/build/CoMD/CoMD/src-openmp/haloExchange.c:635
- /home/eoseret/qaas_runs_ZEN5/174-043-3878/intel/CoMD/build/CoMD/CoMD/src-openmp/haloExchange.c:635
- /home/eoseret/qaas_runs_ZEN5/174-043-3878/intel/CoMD/build/CoMD/CoMD/src-openmp/haloExchange.c:636
- /home/eoseret/qaas_runs_ZEN5/174-043-3878/intel/CoMD/build/CoMD/CoMD/src-openmp/haloExchange.c:636

Slow data structures access

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

Details

Constant unknown stride: 1 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)

Vector unaligned load/store instructions

Detected 12 optimal vector unaligned load/store instructions.

Details

VMOVUPD: 12 occurrences►
- /home/eoseret/qaas_runs_ZEN5/174-043-3878/intel/CoMD/build/CoMD/CoMD/src-openmp/haloExchange.c:639
- /home/eoseret/qaas_runs_ZEN5/174-043-3878/intel/CoMD/build/CoMD/CoMD/src-openmp/haloExchange.c:639
- /home/eoseret/qaas_runs_ZEN5/174-043-3878/intel/CoMD/build/CoMD/CoMD/src-openmp/haloExchange.c:639
- /home/eoseret/qaas_runs_ZEN5/174-043-3878/intel/CoMD/build/CoMD/CoMD/src-openmp/haloExchange.c:639
- /home/eoseret/qaas_runs_ZEN5/174-043-3878/intel/CoMD/build/CoMD/CoMD/src-openmp/haloExchange.c:639
- /home/eoseret/qaas_runs_ZEN5/174-043-3878/intel/CoMD/build/CoMD/CoMD/src-openmp/haloExchange.c:639
- /home/eoseret/qaas_runs_ZEN5/174-043-3878/intel/CoMD/build/CoMD/CoMD/src-openmp/haloExchange.c:642
- /home/eoseret/qaas_runs_ZEN5/174-043-3878/intel/CoMD/build/CoMD/CoMD/src-openmp/haloExchange.c:642
- /home/eoseret/qaas_runs_ZEN5/174-043-3878/intel/CoMD/build/CoMD/CoMD/src-openmp/haloExchange.c:642
- /home/eoseret/qaas_runs_ZEN5/174-043-3878/intel/CoMD/build/CoMD/CoMD/src-openmp/haloExchange.c:642
- /home/eoseret/qaas_runs_ZEN5/174-043-3878/intel/CoMD/build/CoMD/CoMD/src-openmp/haloExchange.c:642
- /home/eoseret/qaas_runs_ZEN5/174-043-3878/intel/CoMD/build/CoMD/CoMD/src-openmp/haloExchange.c:642

Workaround

Use vector aligned instructions:

align your arrays on 64 bytes boundaries: replace { void *p = malloc (size); } with { void *p; posix_memalign (&p, 64, size); }.
inform your compiler that your arrays are vector aligned: if array 'foo' is 64 bytes-aligned, define a pointer 'p_foo' as __builtin_assume_aligned (foo, 64) and use it instead of 'foo' in the loop.

Gather/scatter instructions

Detected gather/scatter instructions (typically caused by indirect accesses).

Details

VGATHERQPD: 12 occurrences►
- /home/eoseret/qaas_runs_ZEN5/174-043-3878/intel/CoMD/build/CoMD/CoMD/src-openmp/haloExchange.c:637
- /home/eoseret/qaas_runs_ZEN5/174-043-3878/intel/CoMD/build/CoMD/CoMD/src-openmp/haloExchange.c:637
- /home/eoseret/qaas_runs_ZEN5/174-043-3878/intel/CoMD/build/CoMD/CoMD/src-openmp/haloExchange.c:638
- /home/eoseret/qaas_runs_ZEN5/174-043-3878/intel/CoMD/build/CoMD/CoMD/src-openmp/haloExchange.c:638
- /home/eoseret/qaas_runs_ZEN5/174-043-3878/intel/CoMD/build/CoMD/CoMD/src-openmp/haloExchange.c:639
- /home/eoseret/qaas_runs_ZEN5/174-043-3878/intel/CoMD/build/CoMD/CoMD/src-openmp/haloExchange.c:639
- /home/eoseret/qaas_runs_ZEN5/174-043-3878/intel/CoMD/build/CoMD/CoMD/src-openmp/haloExchange.c:640
- /home/eoseret/qaas_runs_ZEN5/174-043-3878/intel/CoMD/build/CoMD/CoMD/src-openmp/haloExchange.c:640
- /home/eoseret/qaas_runs_ZEN5/174-043-3878/intel/CoMD/build/CoMD/CoMD/src-openmp/haloExchange.c:641
- /home/eoseret/qaas_runs_ZEN5/174-043-3878/intel/CoMD/build/CoMD/CoMD/src-openmp/haloExchange.c:641
- /home/eoseret/qaas_runs_ZEN5/174-043-3878/intel/CoMD/build/CoMD/CoMD/src-openmp/haloExchange.c:642
- /home/eoseret/qaas_runs_ZEN5/174-043-3878/intel/CoMD/build/CoMD/CoMD/src-openmp/haloExchange.c:642
VPGATHERQD: 4 occurrences►
- /home/eoseret/qaas_runs_ZEN5/174-043-3878/intel/CoMD/build/CoMD/CoMD/src-openmp/haloExchange.c:635
- /home/eoseret/qaas_runs_ZEN5/174-043-3878/intel/CoMD/build/CoMD/CoMD/src-openmp/haloExchange.c:635
- /home/eoseret/qaas_runs_ZEN5/174-043-3878/intel/CoMD/build/CoMD/CoMD/src-openmp/haloExchange.c:636
- /home/eoseret/qaas_runs_ZEN5/174-043-3878/intel/CoMD/build/CoMD/CoMD/src-openmp/haloExchange.c:636

Workaround

Try to simplify your code and/or replace indirect accesses with unit-stride ones.

Type of elements and instruction set

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 is loading 896 bytes. The binary loop is storing 896 bytes.

General properties

nb instructions	104
nb uops	850
loop length	629
used x86 registers	8
used mmx registers	0
used xmm registers	7
used ymm registers	2
used zmm registers	21
nb stack references	0

Front-end

ASSUMED MACRO FUSION FIT IN UOP CACHE

micro-operation queue	106.25 cycles
front end	106.25 cycles

Back-end

	P0	P1	P2	P3	P4	P5	P6	P7	P8	P9	P10	P11	P12	P13	P14	P15
uops	0.50	0.50	0.50	0.50	0.50	0.50	35.50	35.50	35.50	35.50	65.50	65.50	65.50	65.50	88.00	88.00
cycles	0.50	0.50	0.50	0.50	0.50	0.50	35.50	35.50	35.50	35.50	65.50	65.50	65.50	65.50	88.00	88.00

Execution ports to units layout:

P0: ALU
P1: ALU
P2: ALU
P3: ALU, BRU
P4: ALU, BRU
P5: ALU, BRU
P6 (512 bits): store address, load
P7 (512 bits): store address, load
P8 (512 bits): store address, load
P9 (512 bits): store address, load
P10 (512 bits): VPU, DIV/SQRT
P11 (512 bits): VPU, DIV/SQRT
P12 (512 bits): VPU
P13 (512 bits): VPU
P14 (512 bits): FP store data
P15 (512 bits): FP store data

Cycles executing div or sqrt instructions	NA
Longest recurrence chain latency (RecMII)	1.00

Cycles summary

Front-end	106.25
Dispatch	88.00
Data deps.	1.00
Overall L1	106.25

Vectorization ratios

INT

all	94%
load	100%
store	100%
mul	100%
add-sub	100%
fma	NA (no fma vectorizable/vectorized instructions)
other	92%

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	100%

INT+FP

all	98%
load	100%
store	100%
mul	100%
add-sub	100%
fma	NA (no fma vectorizable/vectorized instructions)
div/sqrt	NA (no div/sqrt vectorizable/vectorized instructions)
other	98%

Vector efficiency ratios

INT

all	53%
load	50%
store	100%
mul	100%
add-sub	100%
fma	NA (no fma vectorizable/vectorized instructions)
other	35%

all	88%
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	86%

INT+FP

all	81%
load	87%
store	100%
mul	100%
add-sub	100%
fma	NA (no fma vectorizable/vectorized instructions)
div/sqrt	NA (no div/sqrt vectorizable/vectorized instructions)
other	76%

Cycles and memory resources usage

Assuming all data fit into the L1 cache, each iteration of the binary loop takes 106.25 cycles. At this rate:

3% of peak load performance is reached (8.43 out of 256.00 bytes loaded per cycle (GB/s @ 1GHz))
6% of peak store performance is reached (8.43 out of 128.00 bytes stored per cycle (GB/s @ 1GHz))

Front-end bottlenecks

Performance is limited by instruction throughput (loading/decoding program instructions to execution core) (front-end is a bottleneck). By removing all these bottlenecks, you can lower the cost of an iteration from 106.25 to 88.00 cycles (1.21x speedup).

ASM code

In the binary file, the address of the loop is: 408b70

Instruction	Nb FU	P0	P1	P2	P3	P4	P5	P6	P7	P8	P9	P10	P11	P12	P13	P14	P15	Latency	Recip. throughput	Vectorization
VPBROADCASTQ %R13,%ZMM9	2	0	0	0	0	0	0	0	0	0	0	0	0.50	0.50	0	0	0	1	1	scal (12.5%)
VPMULLQ %ZMM0,%ZMM9,%ZMM9	1	0	0	0	0	0	0	0	0	0	0	0.50	0.50	0	0	0	0	3	0.50	vect (100.0%)
VPADDQ %ZMM1,%ZMM9,%ZMM10	1	0	0	0	0	0	0	0	0	0	0	0.25	0.25	0.25	0.25	0	0	1	0.25	vect (100.0%)
VPADDQ %ZMM2,%ZMM9,%ZMM9	1	0	0	0	0	0	0	0	0	0	0	0.25	0.25	0.25	0.25	0	0	1	0.25	vect (100.0%)
KXNORW %K0,%K0,%K1	1	0	0	0	0	0	0	0	0	0	0	0.50	0	0	0.50	0	0	1	0.50	N/A
VPXOR %XMM11,%XMM11,%XMM11	1	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0.25	vect (25.0%)
VPGATHERQD (%RBX,%ZMM9,1),%YMM11{%K1}	46	0	0	0	0	0	0	2	2	2	2	2.50	3.50	3.50	2.50	5	5	0-17	8.50	vect (50.0%)
KXNORW %K0,%K0,%K1	1	0	0	0	0	0	0	0	0	0	0	0.50	0	0	0.50	0	0	1	0.50	N/A
VPXOR %XMM12,%XMM12,%XMM12	1	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0.25	vect (25.0%)
VPGATHERQD (%RBX,%ZMM10,1),%YMM12{%K1}	46	0	0	0	0	0	0	2	2	2	2	2.50	3.50	3.50	2.50	5	5	0-17	8.50	vect (50.0%)
VINSERTI64X4 $0x1,%YMM11,%ZMM12,%ZMM11	1	0	0	0	0	0	0	0	0	0	0	0	0.50	0.50	0	0	0	1	0.50	vect (50.0%)
VMOVDQU64 %ZMM11,(%RDI,%R13,4)	2	0	0	0	0	0	0	0.25	0.25	0.25	0.25	0	0	0	0	1	1	4	1	vect (100.0%)
KXNORW %K0,%K0,%K1	1	0	0	0	0	0	0	0	0	0	0	0.50	0	0	0.50	0	0	1	0.50	N/A
VPXOR %XMM11,%XMM11,%XMM11	1	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0.25	vect (25.0%)
VPGATHERQD 0x4(%RBX,%ZMM9,1),%YMM11{%K1}	46	0	0	0	0	0	0	2	2	2	2	2.50	3.50	3.50	2.50	5	5	0-17	8.50	vect (50.0%)
KXNORW %K0,%K0,%K1	1	0	0	0	0	0	0	0	0	0	0	0.50	0	0	0.50	0	0	1	0.50	N/A
VPXOR %XMM12,%XMM12,%XMM12	1	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0.25	vect (25.0%)
VPGATHERQD 0x4(%RBX,%ZMM10,1),%YMM12{%K1}	46	0	0	0	0	0	0	2	2	2	2	2.50	3.50	3.50	2.50	5	5	0-17	8.50	vect (50.0%)
VINSERTI64X4 $0x1,%YMM11,%ZMM12,%ZMM11	1	0	0	0	0	0	0	0	0	0	0	0	0.50	0.50	0	0	0	1	0.50	vect (50.0%)
VMOVDQU64 %ZMM11,(%R8,%R13,4)	2	0	0	0	0	0	0	0.25	0.25	0.25	0.25	0	0	0	0	1	1	4	1	vect (100.0%)
VPXOR %XMM11,%XMM11,%XMM11	1	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0.25	vect (25.0%)
KXNORW %K0,%K0,%K1	1	0	0	0	0	0	0	0	0	0	0	0.50	0	0	0.50	0	0	1	0.50	N/A
VGATHERQPD 0x8(%RBX,%ZMM9,1),%ZMM11{%K1}	48	0	0	0	0	0	0	2	2	2	2	2.50	4	4.50	3	5	5	0-16	8.94	vect (100.0%)
VPXOR %XMM12,%XMM12,%XMM12	1	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0.25	vect (25.0%)
KXNORW %K0,%K0,%K1	1	0	0	0	0	0	0	0	0	0	0	0.50	0	0	0.50	0	0	1	0.50	N/A
VGATHERQPD 0x8(%RBX,%ZMM10,1),%ZMM12{%K1}	48	0	0	0	0	0	0	2	2	2	2	2.50	4	4.50	3	5	5	0-16	8.94	vect (100.0%)
VXORPD %XMM13,%XMM13,%XMM13	1	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0.17	vect (25.0%)
KXNORW %K0,%K0,%K1	1	0	0	0	0	0	0	0	0	0	0	0.50	0	0	0.50	0	0	1	0.50	N/A
VGATHERQPD 0x10(%RBX,%ZMM9,1),%ZMM13{%K1}	48	0	0	0	0	0	0	2	2	2	2	2.50	4	4.50	3	5	5	0-16	8.94	vect (100.0%)
VXORPD %XMM14,%XMM14,%XMM14	1	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0.17	vect (25.0%)
KXNORW %K0,%K0,%K1	1	0	0	0	0	0	0	0	0	0	0	0.50	0	0	0.50	0	0	1	0.50	N/A
VGATHERQPD 0x10(%RBX,%ZMM10,1),%ZMM14{%K1}	48	0	0	0	0	0	0	2	2	2	2	2.50	4	4.50	3	5	5	0-16	8.94	vect (100.0%)
VXORPD %XMM15,%XMM15,%XMM15	1	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0.17	vect (25.0%)
KXNORW %K0,%K0,%K1	1	0	0	0	0	0	0	0	0	0	0	0.50	0	0	0.50	0	0	1	0.50	N/A
VGATHERQPD 0x18(%RBX,%ZMM10,1),%ZMM15{%K1}	48	0	0	0	0	0	0	2	2	2	2	2.50	4	4.50	3	5	5	0-16	8.94	vect (100.0%)
VXORPD %XMM16,%XMM16,%XMM16	1	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0.17	vect (25.0%)
KXNORW %K0,%K0,%K1	1	0	0	0	0	0	0	0	0	0	0	0.50	0	0	0.50	0	0	1	0.50	N/A
VGATHERQPD 0x18(%RBX,%ZMM9,1),%ZMM16{%K1}	48	0	0	0	0	0	0	2	2	2	2	2.50	4	4.50	3	5	5	0-16	8.94	vect (100.0%)
VMOVAPD %ZMM14,%ZMM17	1	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0.17	vect (100.0%)
VPERMT2PD %ZMM12,%ZMM3,%ZMM17	1	0	0	0	0	0	0	0	0	0	0	0	0.50	0.50	0	0	0	5	0.50	vect (100.0%)
VMOVAPD %ZMM12,%ZMM18	1	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0.17	vect (100.0%)
VPERMT2PD %ZMM14,%ZMM4,%ZMM18	1	0	0	0	0	0	0	0	0	0	0	0	0.50	0.50	0	0	0	5	0.50	vect (100.0%)
VMOVAPD %ZMM13,%ZMM19	1	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0.17	vect (100.0%)
VPERMT2PD %ZMM11,%ZMM3,%ZMM19	1	0	0	0	0	0	0	0	0	0	0	0	0.50	0.50	0	0	0	5	0.50	vect (100.0%)
VMOVAPD %ZMM11,%ZMM20	1	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0.17	vect (100.0%)
VPERMT2PD %ZMM13,%ZMM4,%ZMM20	1	0	0	0	0	0	0	0	0	0	0	0	0.50	0.50	0	0	0	5	0.50	vect (100.0%)
VPERMT2PD %ZMM14,%ZMM5,%ZMM12	1	0	0	0	0	0	0	0	0	0	0	0	0.50	0.50	0	0	0	5	0.50	vect (100.0%)
VPERMT2PD %ZMM13,%ZMM5,%ZMM11	1	0	0	0	0	0	0	0	0	0	0	0	0.50	0.50	0	0	0	5	0.50	vect (100.0%)
VPERMT2PD %ZMM16,%ZMM6,%ZMM11	1	0	0	0	0	0	0	0	0	0	0	0	0.50	0.50	0	0	0	5	0.50	vect (100.0%)
VPERMT2PD %ZMM15,%ZMM6,%ZMM12	1	0	0	0	0	0	0	0	0	0	0	0	0.50	0.50	0	0	0	5	0.50	vect (100.0%)
VPERMT2PD %ZMM16,%ZMM7,%ZMM20	1	0	0	0	0	0	0	0	0	0	0	0	0.50	0.50	0	0	0	5	0.50	vect (100.0%)
VPERMT2PD %ZMM16,%ZMM8,%ZMM19	1	0	0	0	0	0	0	0	0	0	0	0	0.50	0.50	0	0	0	5	0.50	vect (100.0%)
VPERMT2PD %ZMM15,%ZMM7,%ZMM18	1	0	0	0	0	0	0	0	0	0	0	0	0.50	0.50	0	0	0	5	0.50	vect (100.0%)
VPERMT2PD %ZMM15,%ZMM8,%ZMM17	1	0	0	0	0	0	0	0	0	0	0	0	0.50	0.50	0	0	0	5	0.50	vect (100.0%)
VMOVUPD %ZMM17,0x80(%RDX,%R9,1)	1	0	0	0	0	0	0	0.25	0.25	0.25	0.25	0	0	0	0	0.50	0.50	4	1	vect (100.0%)
VMOVUPD %ZMM18,(%RDX,%R9,1)	1	0	0	0	0	0	0	0.25	0.25	0.25	0.25	0	0	0	0	0.50	0.50	4	1	vect (100.0%)
VMOVUPD %ZMM19,0x140(%RDX,%R9,1)	1	0	0	0	0	0	0	0.25	0.25	0.25	0.25	0	0	0	0	0.50	0.50	4	1	vect (100.0%)
VMOVUPD %ZMM20,0xc0(%RDX,%R9,1)	1	0	0	0	0	0	0	0.25	0.25	0.25	0.25	0	0	0	0	0.50	0.50	4	1	vect (100.0%)
VMOVUPD %ZMM12,0x40(%RDX,%R9,1)	1	0	0	0	0	0	0	0.25	0.25	0.25	0.25	0	0	0	0	0.50	0.50	4	1	vect (100.0%)
VMOVUPD %ZMM11,0x100(%RDX,%R9,1)	1	0	0	0	0	0	0	0.25	0.25	0.25	0.25	0	0	0	0	0.50	0.50	4	1	vect (100.0%)
VXORPD %XMM11,%XMM11,%XMM11	1	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0.17	vect (25.0%)
KXNORW %K0,%K0,%K1	1	0	0	0	0	0	0	0	0	0	0	0.50	0	0	0.50	0	0	1	0.50	N/A
VGATHERQPD 0x20(%RBX,%ZMM9,1),%ZMM11{%K1}	48	0	0	0	0	0	0	2	2	2	2	2.50	4	4.50	3	5	5	0-16	8.94	vect (100.0%)
VXORPD %XMM12,%XMM12,%XMM12	1	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0.17	vect (25.0%)
KXNORW %K0,%K0,%K1	1	0	0	0	0	0	0	0	0	0	0	0.50	0	0	0.50	0	0	1	0.50	N/A
VGATHERQPD 0x20(%RBX,%ZMM10,1),%ZMM12{%K1}	48	0	0	0	0	0	0	2	2	2	2	2.50	4	4.50	3	5	5	0-16	8.94	vect (100.0%)
VXORPD %XMM13,%XMM13,%XMM13	1	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0.17	vect (25.0%)
KXNORW %K0,%K0,%K1	1	0	0	0	0	0	0	0	0	0	0	0.50	0	0	0.50	0	0	1	0.50	N/A
VGATHERQPD 0x28(%RBX,%ZMM9,1),%ZMM13{%K1}	48	0	0	0	0	0	0	2	2	2	2	2.50	4	4.50	3	5	5	0-16	8.94	vect (100.0%)
VXORPD %XMM14,%XMM14,%XMM14	1	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0.17	vect (25.0%)
KXNORW %K0,%K0,%K1	1	0	0	0	0	0	0	0	0	0	0	0.50	0	0	0.50	0	0	1	0.50	N/A
VGATHERQPD 0x28(%RBX,%ZMM10,1),%ZMM14{%K1}	48	0	0	0	0	0	0	2	2	2	2	2.50	4	4.50	3	5	5	0-16	8.94	vect (100.0%)
VXORPD %XMM15,%XMM15,%XMM15	1	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0.17	vect (25.0%)
KXNORW %K0,%K0,%K1	1	0	0	0	0	0	0	0	0	0	0	0.50	0	0	0.50	0	0	1	0.50	N/A
VGATHERQPD 0x30(%RBX,%ZMM10,1),%ZMM15{%K1}	48	0	0	0	0	0	0	2	2	2	2	2.50	4	4.50	3	5	5	0-16	8.94	vect (100.0%)
VXORPD %XMM10,%XMM10,%XMM10	1	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0.17	vect (25.0%)
KXNORW %K0,%K0,%K1	1	0	0	0	0	0	0	0	0	0	0	0.50	0	0	0.50	0	0	1	0.50	N/A
VGATHERQPD 0x30(%RBX,%ZMM9,1),%ZMM10{%K1}	48	0	0	0	0	0	0	2	2	2	2	2.50	4	4.50	3	5	5	0-16	8.94	vect (100.0%)
VMOVAPD %ZMM14,%ZMM9	1	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0.17	vect (100.0%)
VPERMT2PD %ZMM12,%ZMM3,%ZMM9	1	0	0	0	0	0	0	0	0	0	0	0	0.50	0.50	0	0	0	5	0.50	vect (100.0%)
VMOVAPD %ZMM12,%ZMM16	1	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0.17	vect (100.0%)
VPERMT2PD %ZMM14,%ZMM4,%ZMM16	1	0	0	0	0	0	0	0	0	0	0	0	0.50	0.50	0	0	0	5	0.50	vect (100.0%)
VMOVAPD %ZMM13,%ZMM17	1	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0.17	vect (100.0%)
VPERMT2PD %ZMM11,%ZMM3,%ZMM17	1	0	0	0	0	0	0	0	0	0	0	0	0.50	0.50	0	0	0	5	0.50	vect (100.0%)
VMOVAPD %ZMM11,%ZMM18	1	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0.17	vect (100.0%)
VPERMT2PD %ZMM13,%ZMM4,%ZMM18	1	0	0	0	0	0	0	0	0	0	0	0	0.50	0.50	0	0	0	5	0.50	vect (100.0%)
VPERMT2PD %ZMM14,%ZMM5,%ZMM12	1	0	0	0	0	0	0	0	0	0	0	0	0.50	0.50	0	0	0	5	0.50	vect (100.0%)
VPERMT2PD %ZMM13,%ZMM5,%ZMM11	1	0	0	0	0	0	0	0	0	0	0	0	0.50	0.50	0	0	0	5	0.50	vect (100.0%)
VPERMT2PD %ZMM10,%ZMM6,%ZMM11	1	0	0	0	0	0	0	0	0	0	0	0	0.50	0.50	0	0	0	5	0.50	vect (100.0%)
VPERMT2PD %ZMM15,%ZMM6,%ZMM12	1	0	0	0	0	0	0	0	0	0	0	0	0.50	0.50	0	0	0	5	0.50	vect (100.0%)
VPERMT2PD %ZMM10,%ZMM7,%ZMM18	1	0	0	0	0	0	0	0	0	0	0	0	0.50	0.50	0	0	0	5	0.50	vect (100.0%)
VPERMT2PD %ZMM10,%ZMM8,%ZMM17	1	0	0	0	0	0	0	0	0	0	0	0	0.50	0.50	0	0	0	5	0.50	vect (100.0%)
VPERMT2PD %ZMM15,%ZMM7,%ZMM16	1	0	0	0	0	0	0	0	0	0	0	0	0.50	0.50	0	0	0	5	0.50	vect (100.0%)
VPERMT2PD %ZMM15,%ZMM8,%ZMM9	1	0	0	0	0	0	0	0	0	0	0	0	0.50	0.50	0	0	0	5	0.50	vect (100.0%)
VMOVUPD %ZMM9,0x80(%RSI,%R9,1)	1	0	0	0	0	0	0	0.25	0.25	0.25	0.25	0	0	0	0	0.50	0.50	4	1	vect (100.0%)
VMOVUPD %ZMM16,(%RSI,%R9,1)	1	0	0	0	0	0	0	0.25	0.25	0.25	0.25	0	0	0	0	0.50	0.50	4	1	vect (100.0%)
VMOVUPD %ZMM17,0x140(%RSI,%R9,1)	1	0	0	0	0	0	0	0.25	0.25	0.25	0.25	0	0	0	0	0.50	0.50	4	1	vect (100.0%)
VMOVUPD %ZMM18,0xc0(%RSI,%R9,1)	1	0	0	0	0	0	0	0.25	0.25	0.25	0.25	0	0	0	0	0.50	0.50	4	1	vect (100.0%)
VMOVUPD %ZMM12,0x40(%RSI,%R9,1)	1	0	0	0	0	0	0	0.25	0.25	0.25	0.25	0	0	0	0	0.50	0.50	4	1	vect (100.0%)
VMOVUPD %ZMM11,0x100(%RSI,%R9,1)	1	0	0	0	0	0	0	0.25	0.25	0.25	0.25	0	0	0	0	0.50	0.50	4	1	vect (100.0%)
ADD $0x10,%R13	1	0.17	0.17	0.17	0.17	0.17	0.17	0	0	0	0	0	0	0	0	0	0	1	0.17	N/A
ADD $0x180,%R9	1	0.17	0.17	0.17	0.17	0.17	0.17	0	0	0	0	0	0	0	0	0	0	1	0.17	N/A
CMP %R14,%R13	1	0.17	0.17	0.17	0.17	0.17	0.17	0	0	0	0	0	0	0	0	0	0	1	0.17	N/A
JLE 408b70 <sortAtomsInCell+0x490>	1	0	0	0	0.33	0.33	0.33	0	0	0	0	0	0	0	0	0	0	1	0.50-1	N/A

Function	sortAtomsInCell
Source file and lines	haloExchange.c:633-642
Module	exec

gain
potential
hint
expert

Vectorization

Details

98% of SSE/AVX instructions are used in vector version (process two or more data elements in vector registers):

98% of SSE/AVX 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 loop can use their full power.

Workaround

Pass to your compiler a micro-architecture specialization option:
- use march=native
Use vector aligned instructions:
1. align your arrays on 64 bytes boundaries: replace { void *p = malloc (size); } with { void *p; posix_memalign (&p, 64, size); }.
2. inform your compiler that your arrays are vector aligned: if array 'foo' is 64 bytes-aligned, define a pointer 'p_foo' as __builtin_assume_aligned (foo, 64) and use it instead of 'foo' in the loop.

Execution units bottlenecks

Found no such bottlenecks but see expert reports for more complex bottlenecks.

No data for this section

Complex instructions

Detected COMPLEX INSTRUCTIONS.

Details

These instructions generate more than one micro-operation and only one of them can be decoded during a cycle and the extra micro-operations increase pressure on execution units.

VGATHERQPD: 12 occurrences►
- /home/eoseret/qaas_runs_ZEN5/174-043-3878/intel/CoMD/build/CoMD/CoMD/src-openmp/haloExchange.c:637
- /home/eoseret/qaas_runs_ZEN5/174-043-3878/intel/CoMD/build/CoMD/CoMD/src-openmp/haloExchange.c:637
- /home/eoseret/qaas_runs_ZEN5/174-043-3878/intel/CoMD/build/CoMD/CoMD/src-openmp/haloExchange.c:638
- /home/eoseret/qaas_runs_ZEN5/174-043-3878/intel/CoMD/build/CoMD/CoMD/src-openmp/haloExchange.c:638
- /home/eoseret/qaas_runs_ZEN5/174-043-3878/intel/CoMD/build/CoMD/CoMD/src-openmp/haloExchange.c:639
- /home/eoseret/qaas_runs_ZEN5/174-043-3878/intel/CoMD/build/CoMD/CoMD/src-openmp/haloExchange.c:639
- /home/eoseret/qaas_runs_ZEN5/174-043-3878/intel/CoMD/build/CoMD/CoMD/src-openmp/haloExchange.c:640
- /home/eoseret/qaas_runs_ZEN5/174-043-3878/intel/CoMD/build/CoMD/CoMD/src-openmp/haloExchange.c:640
- /home/eoseret/qaas_runs_ZEN5/174-043-3878/intel/CoMD/build/CoMD/CoMD/src-openmp/haloExchange.c:641
- /home/eoseret/qaas_runs_ZEN5/174-043-3878/intel/CoMD/build/CoMD/CoMD/src-openmp/haloExchange.c:641
- /home/eoseret/qaas_runs_ZEN5/174-043-3878/intel/CoMD/build/CoMD/CoMD/src-openmp/haloExchange.c:642
- /home/eoseret/qaas_runs_ZEN5/174-043-3878/intel/CoMD/build/CoMD/CoMD/src-openmp/haloExchange.c:642
VMOVDQU64: 2 occurrences►
- /home/eoseret/qaas_runs_ZEN5/174-043-3878/intel/CoMD/build/CoMD/CoMD/src-openmp/haloExchange.c:635
- /home/eoseret/qaas_runs_ZEN5/174-043-3878/intel/CoMD/build/CoMD/CoMD/src-openmp/haloExchange.c:636
VPBROADCASTQ: 1 occurrences►
- /home/eoseret/qaas_runs_ZEN5/174-043-3878/intel/CoMD/build/CoMD/CoMD/src-openmp/haloExchange.c:633
VPGATHERQD: 4 occurrences►
- /home/eoseret/qaas_runs_ZEN5/174-043-3878/intel/CoMD/build/CoMD/CoMD/src-openmp/haloExchange.c:635
- /home/eoseret/qaas_runs_ZEN5/174-043-3878/intel/CoMD/build/CoMD/CoMD/src-openmp/haloExchange.c:635
- /home/eoseret/qaas_runs_ZEN5/174-043-3878/intel/CoMD/build/CoMD/CoMD/src-openmp/haloExchange.c:636
- /home/eoseret/qaas_runs_ZEN5/174-043-3878/intel/CoMD/build/CoMD/CoMD/src-openmp/haloExchange.c:636

Slow data structures access

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

Details

Constant unknown stride: 1 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)

Vector unaligned load/store instructions

Detected 12 optimal vector unaligned load/store instructions.

Details

VMOVUPD: 12 occurrences►
- /home/eoseret/qaas_runs_ZEN5/174-043-3878/intel/CoMD/build/CoMD/CoMD/src-openmp/haloExchange.c:639
- /home/eoseret/qaas_runs_ZEN5/174-043-3878/intel/CoMD/build/CoMD/CoMD/src-openmp/haloExchange.c:639
- /home/eoseret/qaas_runs_ZEN5/174-043-3878/intel/CoMD/build/CoMD/CoMD/src-openmp/haloExchange.c:639
- /home/eoseret/qaas_runs_ZEN5/174-043-3878/intel/CoMD/build/CoMD/CoMD/src-openmp/haloExchange.c:639
- /home/eoseret/qaas_runs_ZEN5/174-043-3878/intel/CoMD/build/CoMD/CoMD/src-openmp/haloExchange.c:639
- /home/eoseret/qaas_runs_ZEN5/174-043-3878/intel/CoMD/build/CoMD/CoMD/src-openmp/haloExchange.c:639
- /home/eoseret/qaas_runs_ZEN5/174-043-3878/intel/CoMD/build/CoMD/CoMD/src-openmp/haloExchange.c:642
- /home/eoseret/qaas_runs_ZEN5/174-043-3878/intel/CoMD/build/CoMD/CoMD/src-openmp/haloExchange.c:642
- /home/eoseret/qaas_runs_ZEN5/174-043-3878/intel/CoMD/build/CoMD/CoMD/src-openmp/haloExchange.c:642
- /home/eoseret/qaas_runs_ZEN5/174-043-3878/intel/CoMD/build/CoMD/CoMD/src-openmp/haloExchange.c:642
- /home/eoseret/qaas_runs_ZEN5/174-043-3878/intel/CoMD/build/CoMD/CoMD/src-openmp/haloExchange.c:642
- /home/eoseret/qaas_runs_ZEN5/174-043-3878/intel/CoMD/build/CoMD/CoMD/src-openmp/haloExchange.c:642

Workaround

Use vector aligned instructions:

align your arrays on 64 bytes boundaries: replace { void *p = malloc (size); } with { void *p; posix_memalign (&p, 64, size); }.
inform your compiler that your arrays are vector aligned: if array 'foo' is 64 bytes-aligned, define a pointer 'p_foo' as __builtin_assume_aligned (foo, 64) and use it instead of 'foo' in the loop.

Gather/scatter instructions

Detected gather/scatter instructions (typically caused by indirect accesses).

Details

VGATHERQPD: 12 occurrences►
- /home/eoseret/qaas_runs_ZEN5/174-043-3878/intel/CoMD/build/CoMD/CoMD/src-openmp/haloExchange.c:637
- /home/eoseret/qaas_runs_ZEN5/174-043-3878/intel/CoMD/build/CoMD/CoMD/src-openmp/haloExchange.c:637
- /home/eoseret/qaas_runs_ZEN5/174-043-3878/intel/CoMD/build/CoMD/CoMD/src-openmp/haloExchange.c:638
- /home/eoseret/qaas_runs_ZEN5/174-043-3878/intel/CoMD/build/CoMD/CoMD/src-openmp/haloExchange.c:638
- /home/eoseret/qaas_runs_ZEN5/174-043-3878/intel/CoMD/build/CoMD/CoMD/src-openmp/haloExchange.c:639
- /home/eoseret/qaas_runs_ZEN5/174-043-3878/intel/CoMD/build/CoMD/CoMD/src-openmp/haloExchange.c:639
- /home/eoseret/qaas_runs_ZEN5/174-043-3878/intel/CoMD/build/CoMD/CoMD/src-openmp/haloExchange.c:640
- /home/eoseret/qaas_runs_ZEN5/174-043-3878/intel/CoMD/build/CoMD/CoMD/src-openmp/haloExchange.c:640
- /home/eoseret/qaas_runs_ZEN5/174-043-3878/intel/CoMD/build/CoMD/CoMD/src-openmp/haloExchange.c:641
- /home/eoseret/qaas_runs_ZEN5/174-043-3878/intel/CoMD/build/CoMD/CoMD/src-openmp/haloExchange.c:641
- /home/eoseret/qaas_runs_ZEN5/174-043-3878/intel/CoMD/build/CoMD/CoMD/src-openmp/haloExchange.c:642
- /home/eoseret/qaas_runs_ZEN5/174-043-3878/intel/CoMD/build/CoMD/CoMD/src-openmp/haloExchange.c:642
VPGATHERQD: 4 occurrences►
- /home/eoseret/qaas_runs_ZEN5/174-043-3878/intel/CoMD/build/CoMD/CoMD/src-openmp/haloExchange.c:635
- /home/eoseret/qaas_runs_ZEN5/174-043-3878/intel/CoMD/build/CoMD/CoMD/src-openmp/haloExchange.c:635
- /home/eoseret/qaas_runs_ZEN5/174-043-3878/intel/CoMD/build/CoMD/CoMD/src-openmp/haloExchange.c:636
- /home/eoseret/qaas_runs_ZEN5/174-043-3878/intel/CoMD/build/CoMD/CoMD/src-openmp/haloExchange.c:636

Workaround

Try to simplify your code and/or replace indirect accesses with unit-stride ones.

Type of elements and instruction set

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 is loading 896 bytes. The binary loop is storing 896 bytes.

General properties

nb instructions	104
nb uops	850
loop length	629
used x86 registers	8
used mmx registers	0
used xmm registers	7
used ymm registers	2
used zmm registers	21
nb stack references	0

Front-end

ASSUMED MACRO FUSION FIT IN UOP CACHE

micro-operation queue	106.25 cycles
front end	106.25 cycles

Back-end

	P0	P1	P2	P3	P4	P5	P6	P7	P8	P9	P10	P11	P12	P13	P14	P15
uops	0.50	0.50	0.50	0.50	0.50	0.50	35.50	35.50	35.50	35.50	65.50	65.50	65.50	65.50	88.00	88.00
cycles	0.50	0.50	0.50	0.50	0.50	0.50	35.50	35.50	35.50	35.50	65.50	65.50	65.50	65.50	88.00	88.00

Execution ports to units layout:

P0: ALU
P1: ALU
P2: ALU
P3: ALU, BRU
P4: ALU, BRU
P5: ALU, BRU
P6 (512 bits): store address, load
P7 (512 bits): store address, load
P8 (512 bits): store address, load
P9 (512 bits): store address, load
P10 (512 bits): VPU, DIV/SQRT
P11 (512 bits): VPU, DIV/SQRT
P12 (512 bits): VPU
P13 (512 bits): VPU
P14 (512 bits): FP store data
P15 (512 bits): FP store data

Cycles executing div or sqrt instructions	NA
Longest recurrence chain latency (RecMII)	1.00

Cycles summary

Front-end	106.25
Dispatch	88.00
Data deps.	1.00
Overall L1	106.25

Vectorization ratios

INT

all	94%
load	100%
store	100%
mul	100%
add-sub	100%
fma	NA (no fma vectorizable/vectorized instructions)
other	92%

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	100%

INT+FP

all	98%
load	100%
store	100%
mul	100%
add-sub	100%
fma	NA (no fma vectorizable/vectorized instructions)
div/sqrt	NA (no div/sqrt vectorizable/vectorized instructions)
other	98%

Vector efficiency ratios

INT

all	53%
load	50%
store	100%
mul	100%
add-sub	100%
fma	NA (no fma vectorizable/vectorized instructions)
other	35%

all	88%
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	86%

INT+FP

all	81%
load	87%
store	100%
mul	100%
add-sub	100%
fma	NA (no fma vectorizable/vectorized instructions)
div/sqrt	NA (no div/sqrt vectorizable/vectorized instructions)
other	76%

Cycles and memory resources usage

Assuming all data fit into the L1 cache, each iteration of the binary loop takes 106.25 cycles. At this rate:

3% of peak load performance is reached (8.43 out of 256.00 bytes loaded per cycle (GB/s @ 1GHz))
6% of peak store performance is reached (8.43 out of 128.00 bytes stored per cycle (GB/s @ 1GHz))

Front-end bottlenecks

ASM code

In the binary file, the address of the loop is: 408b70

Instruction	Nb FU	P0	P1	P2	P3	P4	P5	P6	P7	P8	P9	P10	P11	P12	P13	P14	P15	Latency	Recip. throughput	Vectorization
VPBROADCASTQ %R13,%ZMM9	2	0	0	0	0	0	0	0	0	0	0	0	0.50	0.50	0	0	0	1	1	scal (12.5%)
VPMULLQ %ZMM0,%ZMM9,%ZMM9	1	0	0	0	0	0	0	0	0	0	0	0.50	0.50	0	0	0	0	3	0.50	vect (100.0%)
VPADDQ %ZMM1,%ZMM9,%ZMM10	1	0	0	0	0	0	0	0	0	0	0	0.25	0.25	0.25	0.25	0	0	1	0.25	vect (100.0%)
VPADDQ %ZMM2,%ZMM9,%ZMM9	1	0	0	0	0	0	0	0	0	0	0	0.25	0.25	0.25	0.25	0	0	1	0.25	vect (100.0%)
KXNORW %K0,%K0,%K1	1	0	0	0	0	0	0	0	0	0	0	0.50	0	0	0.50	0	0	1	0.50	N/A
VPXOR %XMM11,%XMM11,%XMM11	1	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0.25	vect (25.0%)
VPGATHERQD (%RBX,%ZMM9,1),%YMM11{%K1}	46	0	0	0	0	0	0	2	2	2	2	2.50	3.50	3.50	2.50	5	5	0-17	8.50	vect (50.0%)
KXNORW %K0,%K0,%K1	1	0	0	0	0	0	0	0	0	0	0	0.50	0	0	0.50	0	0	1	0.50	N/A
VPXOR %XMM12,%XMM12,%XMM12	1	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0.25	vect (25.0%)
VPGATHERQD (%RBX,%ZMM10,1),%YMM12{%K1}	46	0	0	0	0	0	0	2	2	2	2	2.50	3.50	3.50	2.50	5	5	0-17	8.50	vect (50.0%)
VINSERTI64X4 $0x1,%YMM11,%ZMM12,%ZMM11	1	0	0	0	0	0	0	0	0	0	0	0	0.50	0.50	0	0	0	1	0.50	vect (50.0%)
VMOVDQU64 %ZMM11,(%RDI,%R13,4)	2	0	0	0	0	0	0	0.25	0.25	0.25	0.25	0	0	0	0	1	1	4	1	vect (100.0%)
KXNORW %K0,%K0,%K1	1	0	0	0	0	0	0	0	0	0	0	0.50	0	0	0.50	0	0	1	0.50	N/A
VPXOR %XMM11,%XMM11,%XMM11	1	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0.25	vect (25.0%)
VPGATHERQD 0x4(%RBX,%ZMM9,1),%YMM11{%K1}	46	0	0	0	0	0	0	2	2	2	2	2.50	3.50	3.50	2.50	5	5	0-17	8.50	vect (50.0%)
KXNORW %K0,%K0,%K1	1	0	0	0	0	0	0	0	0	0	0	0.50	0	0	0.50	0	0	1	0.50	N/A
VPXOR %XMM12,%XMM12,%XMM12	1	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0.25	vect (25.0%)
VPGATHERQD 0x4(%RBX,%ZMM10,1),%YMM12{%K1}	46	0	0	0	0	0	0	2	2	2	2	2.50	3.50	3.50	2.50	5	5	0-17	8.50	vect (50.0%)
VINSERTI64X4 $0x1,%YMM11,%ZMM12,%ZMM11	1	0	0	0	0	0	0	0	0	0	0	0	0.50	0.50	0	0	0	1	0.50	vect (50.0%)
VMOVDQU64 %ZMM11,(%R8,%R13,4)	2	0	0	0	0	0	0	0.25	0.25	0.25	0.25	0	0	0	0	1	1	4	1	vect (100.0%)
VPXOR %XMM11,%XMM11,%XMM11	1	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0.25	vect (25.0%)
KXNORW %K0,%K0,%K1	1	0	0	0	0	0	0	0	0	0	0	0.50	0	0	0.50	0	0	1	0.50	N/A
VGATHERQPD 0x8(%RBX,%ZMM9,1),%ZMM11{%K1}	48	0	0	0	0	0	0	2	2	2	2	2.50	4	4.50	3	5	5	0-16	8.94	vect (100.0%)
VPXOR %XMM12,%XMM12,%XMM12	1	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0.25	vect (25.0%)
KXNORW %K0,%K0,%K1	1	0	0	0	0	0	0	0	0	0	0	0.50	0	0	0.50	0	0	1	0.50	N/A
VGATHERQPD 0x8(%RBX,%ZMM10,1),%ZMM12{%K1}	48	0	0	0	0	0	0	2	2	2	2	2.50	4	4.50	3	5	5	0-16	8.94	vect (100.0%)
VXORPD %XMM13,%XMM13,%XMM13	1	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0.17	vect (25.0%)
KXNORW %K0,%K0,%K1	1	0	0	0	0	0	0	0	0	0	0	0.50	0	0	0.50	0	0	1	0.50	N/A
VGATHERQPD 0x10(%RBX,%ZMM9,1),%ZMM13{%K1}	48	0	0	0	0	0	0	2	2	2	2	2.50	4	4.50	3	5	5	0-16	8.94	vect (100.0%)
VXORPD %XMM14,%XMM14,%XMM14	1	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0.17	vect (25.0%)
KXNORW %K0,%K0,%K1	1	0	0	0	0	0	0	0	0	0	0	0.50	0	0	0.50	0	0	1	0.50	N/A
VGATHERQPD 0x10(%RBX,%ZMM10,1),%ZMM14{%K1}	48	0	0	0	0	0	0	2	2	2	2	2.50	4	4.50	3	5	5	0-16	8.94	vect (100.0%)
VXORPD %XMM15,%XMM15,%XMM15	1	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0.17	vect (25.0%)
KXNORW %K0,%K0,%K1	1	0	0	0	0	0	0	0	0	0	0	0.50	0	0	0.50	0	0	1	0.50	N/A
VGATHERQPD 0x18(%RBX,%ZMM10,1),%ZMM15{%K1}	48	0	0	0	0	0	0	2	2	2	2	2.50	4	4.50	3	5	5	0-16	8.94	vect (100.0%)
VXORPD %XMM16,%XMM16,%XMM16	1	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0.17	vect (25.0%)
KXNORW %K0,%K0,%K1	1	0	0	0	0	0	0	0	0	0	0	0.50	0	0	0.50	0	0	1	0.50	N/A
VGATHERQPD 0x18(%RBX,%ZMM9,1),%ZMM16{%K1}	48	0	0	0	0	0	0	2	2	2	2	2.50	4	4.50	3	5	5	0-16	8.94	vect (100.0%)
VMOVAPD %ZMM14,%ZMM17	1	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0.17	vect (100.0%)
VPERMT2PD %ZMM12,%ZMM3,%ZMM17	1	0	0	0	0	0	0	0	0	0	0	0	0.50	0.50	0	0	0	5	0.50	vect (100.0%)
VMOVAPD %ZMM12,%ZMM18	1	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0.17	vect (100.0%)
VPERMT2PD %ZMM14,%ZMM4,%ZMM18	1	0	0	0	0	0	0	0	0	0	0	0	0.50	0.50	0	0	0	5	0.50	vect (100.0%)
VMOVAPD %ZMM13,%ZMM19	1	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0.17	vect (100.0%)
VPERMT2PD %ZMM11,%ZMM3,%ZMM19	1	0	0	0	0	0	0	0	0	0	0	0	0.50	0.50	0	0	0	5	0.50	vect (100.0%)
VMOVAPD %ZMM11,%ZMM20	1	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0.17	vect (100.0%)
VPERMT2PD %ZMM13,%ZMM4,%ZMM20	1	0	0	0	0	0	0	0	0	0	0	0	0.50	0.50	0	0	0	5	0.50	vect (100.0%)
VPERMT2PD %ZMM14,%ZMM5,%ZMM12	1	0	0	0	0	0	0	0	0	0	0	0	0.50	0.50	0	0	0	5	0.50	vect (100.0%)
VPERMT2PD %ZMM13,%ZMM5,%ZMM11	1	0	0	0	0	0	0	0	0	0	0	0	0.50	0.50	0	0	0	5	0.50	vect (100.0%)
VPERMT2PD %ZMM16,%ZMM6,%ZMM11	1	0	0	0	0	0	0	0	0	0	0	0	0.50	0.50	0	0	0	5	0.50	vect (100.0%)
VPERMT2PD %ZMM15,%ZMM6,%ZMM12	1	0	0	0	0	0	0	0	0	0	0	0	0.50	0.50	0	0	0	5	0.50	vect (100.0%)
VPERMT2PD %ZMM16,%ZMM7,%ZMM20	1	0	0	0	0	0	0	0	0	0	0	0	0.50	0.50	0	0	0	5	0.50	vect (100.0%)
VPERMT2PD %ZMM16,%ZMM8,%ZMM19	1	0	0	0	0	0	0	0	0	0	0	0	0.50	0.50	0	0	0	5	0.50	vect (100.0%)
VPERMT2PD %ZMM15,%ZMM7,%ZMM18	1	0	0	0	0	0	0	0	0	0	0	0	0.50	0.50	0	0	0	5	0.50	vect (100.0%)
VPERMT2PD %ZMM15,%ZMM8,%ZMM17	1	0	0	0	0	0	0	0	0	0	0	0	0.50	0.50	0	0	0	5	0.50	vect (100.0%)
VMOVUPD %ZMM17,0x80(%RDX,%R9,1)	1	0	0	0	0	0	0	0.25	0.25	0.25	0.25	0	0	0	0	0.50	0.50	4	1	vect (100.0%)
VMOVUPD %ZMM18,(%RDX,%R9,1)	1	0	0	0	0	0	0	0.25	0.25	0.25	0.25	0	0	0	0	0.50	0.50	4	1	vect (100.0%)
VMOVUPD %ZMM19,0x140(%RDX,%R9,1)	1	0	0	0	0	0	0	0.25	0.25	0.25	0.25	0	0	0	0	0.50	0.50	4	1	vect (100.0%)
VMOVUPD %ZMM20,0xc0(%RDX,%R9,1)	1	0	0	0	0	0	0	0.25	0.25	0.25	0.25	0	0	0	0	0.50	0.50	4	1	vect (100.0%)
VMOVUPD %ZMM12,0x40(%RDX,%R9,1)	1	0	0	0	0	0	0	0.25	0.25	0.25	0.25	0	0	0	0	0.50	0.50	4	1	vect (100.0%)
VMOVUPD %ZMM11,0x100(%RDX,%R9,1)	1	0	0	0	0	0	0	0.25	0.25	0.25	0.25	0	0	0	0	0.50	0.50	4	1	vect (100.0%)
VXORPD %XMM11,%XMM11,%XMM11	1	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0.17	vect (25.0%)
KXNORW %K0,%K0,%K1	1	0	0	0	0	0	0	0	0	0	0	0.50	0	0	0.50	0	0	1	0.50	N/A
VGATHERQPD 0x20(%RBX,%ZMM9,1),%ZMM11{%K1}	48	0	0	0	0	0	0	2	2	2	2	2.50	4	4.50	3	5	5	0-16	8.94	vect (100.0%)
VXORPD %XMM12,%XMM12,%XMM12	1	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0.17	vect (25.0%)
KXNORW %K0,%K0,%K1	1	0	0	0	0	0	0	0	0	0	0	0.50	0	0	0.50	0	0	1	0.50	N/A
VGATHERQPD 0x20(%RBX,%ZMM10,1),%ZMM12{%K1}	48	0	0	0	0	0	0	2	2	2	2	2.50	4	4.50	3	5	5	0-16	8.94	vect (100.0%)
VXORPD %XMM13,%XMM13,%XMM13	1	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0.17	vect (25.0%)
KXNORW %K0,%K0,%K1	1	0	0	0	0	0	0	0	0	0	0	0.50	0	0	0.50	0	0	1	0.50	N/A
VGATHERQPD 0x28(%RBX,%ZMM9,1),%ZMM13{%K1}	48	0	0	0	0	0	0	2	2	2	2	2.50	4	4.50	3	5	5	0-16	8.94	vect (100.0%)
VXORPD %XMM14,%XMM14,%XMM14	1	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0.17	vect (25.0%)
KXNORW %K0,%K0,%K1	1	0	0	0	0	0	0	0	0	0	0	0.50	0	0	0.50	0	0	1	0.50	N/A
VGATHERQPD 0x28(%RBX,%ZMM10,1),%ZMM14{%K1}	48	0	0	0	0	0	0	2	2	2	2	2.50	4	4.50	3	5	5	0-16	8.94	vect (100.0%)
VXORPD %XMM15,%XMM15,%XMM15	1	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0.17	vect (25.0%)
KXNORW %K0,%K0,%K1	1	0	0	0	0	0	0	0	0	0	0	0.50	0	0	0.50	0	0	1	0.50	N/A
VGATHERQPD 0x30(%RBX,%ZMM10,1),%ZMM15{%K1}	48	0	0	0	0	0	0	2	2	2	2	2.50	4	4.50	3	5	5	0-16	8.94	vect (100.0%)
VXORPD %XMM10,%XMM10,%XMM10	1	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0.17	vect (25.0%)
KXNORW %K0,%K0,%K1	1	0	0	0	0	0	0	0	0	0	0	0.50	0	0	0.50	0	0	1	0.50	N/A
VGATHERQPD 0x30(%RBX,%ZMM9,1),%ZMM10{%K1}	48	0	0	0	0	0	0	2	2	2	2	2.50	4	4.50	3	5	5	0-16	8.94	vect (100.0%)
VMOVAPD %ZMM14,%ZMM9	1	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0.17	vect (100.0%)
VPERMT2PD %ZMM12,%ZMM3,%ZMM9	1	0	0	0	0	0	0	0	0	0	0	0	0.50	0.50	0	0	0	5	0.50	vect (100.0%)
VMOVAPD %ZMM12,%ZMM16	1	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0.17	vect (100.0%)
VPERMT2PD %ZMM14,%ZMM4,%ZMM16	1	0	0	0	0	0	0	0	0	0	0	0	0.50	0.50	0	0	0	5	0.50	vect (100.0%)
VMOVAPD %ZMM13,%ZMM17	1	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0.17	vect (100.0%)
VPERMT2PD %ZMM11,%ZMM3,%ZMM17	1	0	0	0	0	0	0	0	0	0	0	0	0.50	0.50	0	0	0	5	0.50	vect (100.0%)
VMOVAPD %ZMM11,%ZMM18	1	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0.17	vect (100.0%)
VPERMT2PD %ZMM13,%ZMM4,%ZMM18	1	0	0	0	0	0	0	0	0	0	0	0	0.50	0.50	0	0	0	5	0.50	vect (100.0%)
VPERMT2PD %ZMM14,%ZMM5,%ZMM12	1	0	0	0	0	0	0	0	0	0	0	0	0.50	0.50	0	0	0	5	0.50	vect (100.0%)
VPERMT2PD %ZMM13,%ZMM5,%ZMM11	1	0	0	0	0	0	0	0	0	0	0	0	0.50	0.50	0	0	0	5	0.50	vect (100.0%)
VPERMT2PD %ZMM10,%ZMM6,%ZMM11	1	0	0	0	0	0	0	0	0	0	0	0	0.50	0.50	0	0	0	5	0.50	vect (100.0%)
VPERMT2PD %ZMM15,%ZMM6,%ZMM12	1	0	0	0	0	0	0	0	0	0	0	0	0.50	0.50	0	0	0	5	0.50	vect (100.0%)
VPERMT2PD %ZMM10,%ZMM7,%ZMM18	1	0	0	0	0	0	0	0	0	0	0	0	0.50	0.50	0	0	0	5	0.50	vect (100.0%)
VPERMT2PD %ZMM10,%ZMM8,%ZMM17	1	0	0	0	0	0	0	0	0	0	0	0	0.50	0.50	0	0	0	5	0.50	vect (100.0%)
VPERMT2PD %ZMM15,%ZMM7,%ZMM16	1	0	0	0	0	0	0	0	0	0	0	0	0.50	0.50	0	0	0	5	0.50	vect (100.0%)
VPERMT2PD %ZMM15,%ZMM8,%ZMM9	1	0	0	0	0	0	0	0	0	0	0	0	0.50	0.50	0	0	0	5	0.50	vect (100.0%)
VMOVUPD %ZMM9,0x80(%RSI,%R9,1)	1	0	0	0	0	0	0	0.25	0.25	0.25	0.25	0	0	0	0	0.50	0.50	4	1	vect (100.0%)
VMOVUPD %ZMM16,(%RSI,%R9,1)	1	0	0	0	0	0	0	0.25	0.25	0.25	0.25	0	0	0	0	0.50	0.50	4	1	vect (100.0%)
VMOVUPD %ZMM17,0x140(%RSI,%R9,1)	1	0	0	0	0	0	0	0.25	0.25	0.25	0.25	0	0	0	0	0.50	0.50	4	1	vect (100.0%)
VMOVUPD %ZMM18,0xc0(%RSI,%R9,1)	1	0	0	0	0	0	0	0.25	0.25	0.25	0.25	0	0	0	0	0.50	0.50	4	1	vect (100.0%)
VMOVUPD %ZMM12,0x40(%RSI,%R9,1)	1	0	0	0	0	0	0	0.25	0.25	0.25	0.25	0	0	0	0	0.50	0.50	4	1	vect (100.0%)
VMOVUPD %ZMM11,0x100(%RSI,%R9,1)	1	0	0	0	0	0	0	0.25	0.25	0.25	0.25	0	0	0	0	0.50	0.50	4	1	vect (100.0%)
ADD $0x10,%R13	1	0.17	0.17	0.17	0.17	0.17	0.17	0	0	0	0	0	0	0	0	0	0	1	0.17	N/A
ADD $0x180,%R9	1	0.17	0.17	0.17	0.17	0.17	0.17	0	0	0	0	0	0	0	0	0	0	1	0.17	N/A
CMP %R14,%R13	1	0.17	0.17	0.17	0.17	0.17	0.17	0	0	0	0	0	0	0	0	0	0	1	0.17	N/A
JLE 408b70 <sortAtomsInCell+0x490>	1	0	0	0	0.33	0.33	0.33	0	0	0	0	0	0	0	0	0	0	1	0.50-1	N/A

Report Configuration

Vectorization

Details

Workaround

Execution units bottlenecks

Complex instructions

Details

Slow data structures access

Details

Workaround

Vector unaligned load/store instructions

Details

Workaround

Gather/scatter instructions

Details

Workaround

Type of elements and instruction set

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

Workaround

Execution units bottlenecks

Complex instructions

Details

Slow data structures access

Details

Workaround

Vector unaligned load/store instructions

Details

Workaround

Gather/scatter instructions

Details

Workaround

Type of elements and instruction set

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