OV - exec - Loop 705

	Loop Id: 705	Module: exec	Source: par_multi_interp.c:939-999 [...]	Coverage: 0.31%

  (704) 0x434f40 LDUR	X10, [X29, #472]

  (704) 0x434f44 ADD	X18, X18, #1

  (704) 0x434f48 CMP	X18, X10

  (704) 0x434f4c B.GE	435184

  (704) 0x434f50 LDUR	X10, [X29, #440]

  (704) 0x434f54 LDR	X1, [X10, X18,LSL #3]

  (704) 0x434f58 STR	X8, [X11, X1,LSL #3]

  (704) 0x434f5c STR	X9, [X12, X1,LSL #3]

  (704) 0x434f60 ADD	X2, X1, #1

  (704) 0x434f64 LDR	X3, [X13, X1,LSL #3]

  (704) 0x434f68 LDR	X10, [X13, X2,LSL #3]

  (704) 0x434f6c CMP	X3, X10

  (704) 0x434f70 B.GE	435080

0x434f74 LDUR	X10, [X29, #480]

0x434f78 LDR	X5, [X19]

0x434f7c LDR	X4, [X10]

0x434f80 LDUR	X10, [X29, #488]

0x434f84 LDR	X6, [X10]

0x434f88 LDUR	X10, [X29, #496]

0x434f8c LDR	X7, [X10]

0x434f90 B	434fb0

0x434fa0 LDR	X10, [X13, X2,LSL #3]

0x434fa4 ADD	X3, X3, #1

0x434fa8 CMP	X3, X10

0x434fac B.GE	435080

0x434fb0 LDR	X10, [X14, X3,LSL #3]

0x434fb4 LDR	X25, [X21]

0x434fb8 LDR	X20, [X15, X10,LSL #3]

0x434fbc SUB	X25, X25, #1

0x434fc0 CMP	X20, X25

0x434fc4 B.NE	434fa0

0x434fc8 ADD	X26, X10, #1

0x434fcc LDR	X20, [X4, X26,LSL #3]

0x434fd0 CMP	X20, #1

0x434fd4 B.LT	435024

0x434fd8 LDR	X30, [X11, X10,LSL #3]

0x434fdc ADD	X25, X20, X30

0x434fe0 B	434ff0

  (707) 0x434fe4 ADD	X30, X30, #1

  (707) 0x434fe8 CMP	X30, X25

  (707) 0x434fec B.GE	435024

  (707) 0x434ff0 LDR	X20, [X21]

  (707) 0x434ff4 ADD	X20, X5, X20,LSL #3

  (707) 0x434ff8 LDUR	X20, [X20, #504]

  (707) 0x434ffc LDR	X28, [X20, X30,LSL #3]

  (707) 0x435000 LDR	X20, [X22, X28,LSL #3]

  (707) 0x435004 CMP	X20, X1

  (707) 0x435008 B.EQ	434fe4

  (707) 0x43500c LDR	X20, [X4, X2,LSL #3]

  (707) 0x435010 ADD	X8, X8, #1

  (707) 0x435014 ADD	X20, X20, #1

  (707) 0x435018 STR	X20, [X4, X2,LSL #3]

  (707) 0x43501c STR	X1, [X22, X28,LSL #3]

  (707) 0x435020 B	434fe4

0x435024 LDR	X20, [X6, X26,LSL #3]

0x435028 CMP	X20, #1

0x43502c B.LT	434fa0

  (704) 0x435080 LDR	X3, [X16, X1,LSL #3]

  (704) 0x435084 LDR	X10, [X16, X2,LSL #3]

  (704) 0x435088 CMP	X3, X10

  (704) 0x43508c B.GE	434f40

  (704) 0x435090 LDP	X4, X5, [X29, #960]

  (704) 0x435094 LDUR	X6, [X29, #464]

  (704) 0x435098 LDR	X4, [X4]

  (704) 0x43509c LDR	X5, [X5]

  (704) 0x4350a0 LDR	X6, [X6]

  (704) 0x4350a4 B	4350b8

    (708) 0x4350a8 LDR	X10, [X16, X2,LSL #3]

    (708) 0x4350ac ADD	X3, X3, #1

    (708) 0x4350b0 CMP	X3, X10

    (708) 0x4350b4 B.GE	434f40

    (708) 0x4350b8 LDR	X7, [X17, X3,LSL #3]

    (708) 0x4350bc LDR	X25, [X21]

    (708) 0x4350c0 LDR	X20, [X0, X7,LSL #3]

    (708) 0x4350c4 SUB	X25, X25, #1

    (708) 0x4350c8 CMP	X20, X25

    (708) 0x4350cc B.NE	4350ac

    (708) 0x4350d0 ADD	X20, X5, X7,LSL #3

    (708) 0x4350d4 LDR	X20, [X20, #8]

    (708) 0x4350d8 CMP	X20, #1

    (708) 0x4350dc B.LT	4350ac

    (708) 0x4350e0 UBFM	X10, X7, #61, #60

    (708) 0x4350e4 LDR	X7, [X4, X10]

    (708) 0x4350e8 LDUR	X10, [X29, #488]

    (708) 0x4350ec LDR	X26, [X10]

    (708) 0x4350f0 LDUR	X10, [X29, #480]

    (708) 0x4350f4 ADD	X30, X20, X7

    (708) 0x4350f8 LDR	X10, [X10]

    (708) 0x4350fc B	43510c

      (709) 0x435100 ADD	X7, X7, #1

      (709) 0x435104 CMP	X7, X30

      (709) 0x435108 B.GE	4350a8

      (709) 0x43510c LDR	X20, [X21]

      (709) 0x435110 LDR	X20, [X6, X20,LSL #3]

      (709) 0x435114 LDR	X25, [X20, X7,LSL #3]

      (709) 0x435118 TBNZ	X25, #63, 435140

      (709) 0x43511c LDR	X20, [X23, X25,LSL #3]

      (709) 0x435120 CMP	X20, X1

      (709) 0x435124 B.EQ	435100

      (709) 0x435128 LDR	X20, [X26, X2,LSL #3]

      (709) 0x43512c ADD	X9, X9, #1

      (709) 0x435130 ADD	X20, X20, #1

      (709) 0x435134 STR	X20, [X26, X2,LSL #3]

      (709) 0x435138 STR	X1, [X23, X25,LSL #3]

      (709) 0x43513c B	435100

      (709) 0x435140 ORN	X25, XZR, X25

      (709) 0x435144 LDR	X20, [X22, X25,LSL #3]

      (709) 0x435148 CMP	X20, X1

      (709) 0x43514c B.EQ	435100

      (709) 0x435150 LDR	X20, [X10, X2,LSL #3]

      (709) 0x435154 ADD	X8, X8, #1

      (709) 0x435158 ADD	X20, X20, #1

      (709) 0x43515c STR	X20, [X10, X2,LSL #3]

      (709) 0x435160 STR	X1, [X22, X25,LSL #3]

      (709) 0x435164 B	435100

/home/eoseret/qaas/qaas_runs/178-188-3659/intel/AMG/build/AMG/AMG/parcsr_ls/par_multi_interp.c: 939 - 999

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

939:           for (i=thread_start; i < thread_stop; i++)

940:           {

941:              i1 = pass_array[i];

942:              P_diag_start[i1] = cnt_nz;

943:              P_offd_start[i1] = cnt_nz_offd;

944:              for (j=S_diag_i[i1]; j < S_diag_i[i1+1]; j++)

945:              {

946:                 j1 = S_diag_j[j];

947:                 if (assigned[j1] == pass-1)

948:                 {

949:                    j_start = P_diag_start[j1];

950:                    j_end = j_start+P_diag_i[j1+1];

951:                    for (k=j_start; k < j_end; k++)

952:                    {

953:                       k1 = P_diag_pass[pass-1][k];

954:                       if (P_marker[k1] != i1)

955:                       {

956:                          cnt_nz++;

957:                          P_diag_i[i1+1]++;

958:                          P_marker[k1] = i1;

959:                       }

960:                    }

961:                    j_start = P_offd_start[j1];

962:                    j_end = j_start+P_offd_i[j1+1];

963:                    for (k=j_start; k < j_end; k++)

[...]

976:              for (j=S_offd_i[i1]; j < S_offd_i[i1+1]; j++)

977:              {

978:                 j1 = S_offd_j[j];

979:                 if (assigned_offd[j1] == pass-1)

980:                 {

981:                    j_start = Pext_start[j1];

982:                    j_end = j_start+Pext_i[j1+1];

983:                    for (k=j_start; k < j_end; k++)

984:                    {

985:                       k1 = Pext_pass[pass][k];

986:                       if (k1 < 0)

987:                       {

988:                          if (P_marker[-k1-1] != i1)

989:                          {

990:                             cnt_nz++;

991:                             P_diag_i[i1+1]++;

992:                             P_marker[-k1-1] = i1;

993:                          }

994:                       }

995:                       else if (P_marker_offd[k1] != i1)

996:                       {

997:                          cnt_nz_offd++;

998:                          P_offd_i[i1+1]++;

999:                          P_marker_offd[k1] = i1;

Coverage (%)	Name	Source Location	Module
►98.22+	__kmp_invoke_microtask		libomp.so
○	__kmp_invoke_task_func		libomp.so
○	__kmp_launch_thread		libomp.so
○	__kmp_launch_worker(void*)		libomp.so
○	start_thread		libc.so.6
○	thread_start		libc.so.6
►1.78+	__kmp_invoke_microtask		libomp.so
○	__kmp_invoke_task_func		libomp.so
○	__kmp_fork_call		libomp.so
○	__kmpc_fork_call		libomp.so
○	hypre_BoomerAMGBuildMultipass	par_multi_interp.c:693	exec
○	hypre_BoomerAMGSetup	par_amg_setup.c:785	exec
○	hypre_PCGSetup	pcg.c:234	exec
○	main	amg.c:398	exec
○	__libc_start_call_main		libc.so.6
○	__libc_start_main		libc.so.6
○	_start		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	4.00
CQA speedup if no inter-iteration dependency	NA
CQA speedup if next bottleneck killed	1.33
Bottlenecks	P10, P11, P12,
Function	hypre_BoomerAMGBuildMultipass.omp_outlined.9
Source	par_multi_interp.c:944-947,par_multi_interp.c:950-951,par_multi_interp.c:962-963
Source loop unroll info	NA
Source loop unroll confidence level	NA
Unroll/vectorization loop type	NA
Unroll factor	NA
CQA cycles	4.67
CQA cycles if no scalar integer	4.67
CQA cycles if FP arith vectorized	4.67
CQA cycles if fully vectorized	1.17
Front-end cycles	3.50
P0 cycles	3.00
P1 cycles	3.00
P2 cycles	2.00
P3 cycles	2.00
P4 cycles	2.00
P5 cycles	2.00
P6 cycles	0.00
P7 cycles	0.00
P8 cycles	0.00
P9 cycles	0.00
P10 cycles	4.67
P11 cycles	4.67
P12 cycles	4.67
P13 cycles	0.00
P14 cycles	0.00
DIV/SQRT cycles	0.00
Inter-iter dependencies cycles	NA
FE+BE cycles (UFS)	NA
Stall cycles (UFS)	NA
Nb insns	28.00
Nb uops	28.00
Nb loads	NA
Nb stores	0.00
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	NA
Stride 1	NA
Stride n	NA
Stride unknown	NA
Stride indirect	NA
Vectorization ratio all	0.00
Vectorization ratio load	0.00
Vectorization ratio store	NA
Vectorization ratio mul	NA
Vectorization ratio add_sub	0.00
Vectorization ratio fma	NA
Vectorization ratio div_sqrt	NA
Vectorization ratio other	0.00
Vector-efficiency ratio all	25.00
Vector-efficiency ratio load	25.00
Vector-efficiency ratio store	NA
Vector-efficiency ratio mul	NA
Vector-efficiency ratio add_sub	25.00
Vector-efficiency ratio fma	NA
Vector-efficiency ratio div_sqrt	NA
Vector-efficiency ratio other	25.00

Metric	Value
CQA speedup if no scalar integer	1.00
CQA speedup if FP arith vectorized	1.00
CQA speedup if fully vectorized	4.00
CQA speedup if no inter-iteration dependency	NA
CQA speedup if next bottleneck killed	1.33
Bottlenecks	P10, P11, P12,
Function	hypre_BoomerAMGBuildMultipass.omp_outlined.9
Source	par_multi_interp.c:944-947,par_multi_interp.c:950-951,par_multi_interp.c:962-963
Source loop unroll info	NA
Source loop unroll confidence level	NA
Unroll/vectorization loop type	NA
Unroll factor	NA
CQA cycles	4.67
CQA cycles if no scalar integer	4.67
CQA cycles if FP arith vectorized	4.67
CQA cycles if fully vectorized	1.17
Front-end cycles	3.50
P0 cycles	3.00
P1 cycles	3.00
P2 cycles	2.00
P3 cycles	2.00
P4 cycles	2.00
P5 cycles	2.00
P6 cycles	0.00
P7 cycles	0.00
P8 cycles	0.00
P9 cycles	0.00
P10 cycles	4.67
P11 cycles	4.67
P12 cycles	4.67
P13 cycles	0.00
P14 cycles	0.00
DIV/SQRT cycles	0.00
Inter-iter dependencies cycles	NA
FE+BE cycles (UFS)	NA
Stall cycles (UFS)	NA
Nb insns	28.00
Nb uops	28.00
Nb loads	NA
Nb stores	0.00
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	NA
Stride 1	NA
Stride n	NA
Stride unknown	NA
Stride indirect	NA
Vectorization ratio all	0.00
Vectorization ratio load	0.00
Vectorization ratio store	NA
Vectorization ratio mul	NA
Vectorization ratio add_sub	0.00
Vectorization ratio fma	NA
Vectorization ratio div_sqrt	NA
Vectorization ratio other	0.00
Vector-efficiency ratio all	25.00
Vector-efficiency ratio load	25.00
Vector-efficiency ratio store	NA
Vector-efficiency ratio mul	NA
Vector-efficiency ratio add_sub	25.00
Vector-efficiency ratio fma	NA
Vector-efficiency ratio div_sqrt	NA
Vector-efficiency ratio other	25.00

Path /

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

Function	hypre_BoomerAMGBuildMultipass.omp_outlined.9
Source file and lines	par_multi_interp.c:939-999
Module	exec

The loop is defined in /home/eoseret/qaas/qaas_runs/178-188-3659/intel/AMG/build/AMG/AMG/parcsr_ls/par_multi_interp.c:939-963,976-999.

Analyzed code is defined in /home/eoseret/qaas/qaas_runs/178-188-3659/intel/AMG/build/AMG/AMG/parcsr_ls/par_multi_interp.c:944-947,950-951,962-963.

Warnings:

Non-innermost loop: analyzing only self part (ignoring child loops).
Ignoring paths for analysis
Failed to get the number of paths
RecMII not computed since number of paths is unknown or > max_paths
Streams not analyzed since number of paths is unknown or > max_paths

gain
potential
hint
expert

Vectorization

Your loop is not vectorized. 4 data elements could be processed at once in vector registers. By vectorizing your loop, you can lower the cost of an iteration from 4.67 to 1.17 cycles (4.00x speedup).

Details

All VPU instructions are used in scalar version (process only one data element in vector registers). Since your execution units are vector units, only a vectorized loop can use their full power.

Workaround

Try another compiler or update/tune your current one
Remove inter-iterations dependences from your loop and make it unit-stride:
- If your arrays have 2 or more dimensions, check whether elements are accessed contiguously and, otherwise, try to permute loops accordingly: C storage order is row-major: for(i) for(j) a[j][i] = b[j][i]; (slow, non stride 1) => for(i) for(j) a[i][j] = b[i][j]; (fast, stride 1)
- If your loop 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

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	28
nb uops	28
loop length	112
used w registers	0
used x registers	18
used b registers	0
used h registers	0
used s registers	0
used d registers	0
used q registers	0
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	3.50 cycles
front end	3.50 cycles

Back-end

	P0	P1	P2	P3	P4	P5	P6	P7	P8	P9	P10	P11	P12	P13	P14
uops	3.00	3.00	2.00	2.00	2.00	2.00	0.00	0.00	0.00	0.00	4.67	4.67	4.67	0.00	0.00
cycles	3.00	3.00	2.00	2.00	2.00	2.00	0.00	0.00	0.00	0.00	4.67	4.67	4.67	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

Cycles summary

Front-end	3.50
Dispatch	4.67
Overall L1	4.67

Vectorization ratios

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

Vector efficiency ratios

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

Cycles and memory resources usage

Assuming all data fit into the L1 cache, each iteration of the binary loop takes 4.67 cycles.

Front-end bottlenecks

Found no such bottlenecks.

ASM code

In the binary file, the address of the loop is: 434fa0

Instruction	Nb FU	P0	P1	P2	P3	P4	P5	P10	P11	P12	Latency	Recip. throughput	Vectorization
LDUR X10, [X29, #480]	1	0	0	0	0	0	0	0.33	0.33	0.33	4	0.33	N/A
LDR X5, [X19]	1	0	0	0	0	0	0	0.33	0.33	0.33	4	0.33	scal (25.0%)
LDR X4, [X10]	1	0	0	0	0	0	0	0.33	0.33	0.33	4	0.33	N/A
LDUR X10, [X29, #488]	1	0	0	0	0	0	0	0.33	0.33	0.33	4	0.33	N/A
LDR X6, [X10]	1	0	0	0	0	0	0	0.33	0.33	0.33	4	0.33	N/A
LDUR X10, [X29, #496]	1	0	0	0	0	0	0	0.33	0.33	0.33	4	0.33	N/A
LDR X7, [X10]	1	0	0	0	0	0	0	0.33	0.33	0.33	4	0.33	scal (25.0%)
B 434fb0 <hypre_BoomerAMGBuildMultipass.omp_outlined.9+0x2d0>	1	0.50	0.50	0	0	0	0	0	0	0	1	0.50	N/A
LDR X10, [X13, X2,LSL #3]	1	0	0	0	0	0	0	0.33	0.33	0.33	4	0.33	N/A
ADD X3, X3, #1	1	0	0	0.25	0.25	0.25	0.25	0	0	0	1	0.25	N/A
CMP X3, X10	1	0	0	0.25	0.25	0.25	0.25	0	0	0	1	0.33	scal (25.0%)
B.GE 435080 <hypre_BoomerAMGBuildMultipass.omp_outlined.9+0x3a0>	1	0.50	0.50	0	0	0	0	0	0	0	1	0.50	N/A
LDR X10, [X14, X3,LSL #3]	1	0	0	0	0	0	0	0.33	0.33	0.33	4	0.33	N/A
LDR X25, [X21]	1	0	0	0	0	0	0	0.33	0.33	0.33	4	0.33	scal (25.0%)
LDR X20, [X15, X10,LSL #3]	1	0	0	0	0	0	0	0.33	0.33	0.33	4	0.33	N/A
SUB X25, X25, #1	1	0	0	0.25	0.25	0.25	0.25	0	0	0	1	0.25	scal (25.0%)
CMP X20, X25	1	0	0	0.25	0.25	0.25	0.25	0	0	0	1	0.33	scal (25.0%)
B.NE 434fa0 <hypre_BoomerAMGBuildMultipass.omp_outlined.9+0x2c0>	1	0.50	0.50	0	0	0	0	0	0	0	1	0.50	N/A
ADD X26, X10, #1	1	0	0	0.25	0.25	0.25	0.25	0	0	0	1	0.25	N/A
LDR X20, [X4, X26,LSL #3]	1	0	0	0	0	0	0	0.33	0.33	0.33	4	0.33	N/A
CMP X20, #1	1	0	0	0.25	0.25	0.25	0.25	0	0	0	1	0.33	scal (25.0%)
B.LT 435024 <hypre_BoomerAMGBuildMultipass.omp_outlined.9+0x344>	1	0.50	0.50	0	0	0	0	0	0	0	1	0.50	N/A
LDR X30, [X11, X10,LSL #3]	1	0	0	0	0	0	0	0.33	0.33	0.33	4	0.33	scal (25.0%)
ADD X25, X20, X30	1	0	0	0.25	0.25	0.25	0.25	0	0	0	1	0.25	scal (25.0%)
B 434ff0 <hypre_BoomerAMGBuildMultipass.omp_outlined.9+0x310>	1	0.50	0.50	0	0	0	0	0	0	0	1	0.50	N/A
LDR X20, [X6, X26,LSL #3]	1	0	0	0	0	0	0	0.33	0.33	0.33	4	0.33	N/A
CMP X20, #1	1	0	0	0.25	0.25	0.25	0.25	0	0	0	1	0.33	N/A
B.LT 434fa0 <hypre_BoomerAMGBuildMultipass.omp_outlined.9+0x2c0>	1	0.50	0.50	0	0	0	0	0	0	0	1	0.50	N/A

Function	hypre_BoomerAMGBuildMultipass.omp_outlined.9
Source file and lines	par_multi_interp.c:939-999
Module	exec

Non-innermost loop: analyzing only self part (ignoring child loops).
Ignoring paths for analysis
Failed to get the number of paths
RecMII not computed since number of paths is unknown or > max_paths
Streams not analyzed since number of paths is unknown or > max_paths

gain
potential
hint
expert

Vectorization

Your loop is not vectorized. 4 data elements could be processed at once in vector registers. By vectorizing your loop, you can lower the cost of an iteration from 4.67 to 1.17 cycles (4.00x speedup).

Details

All VPU instructions are used in scalar version (process only one data element in vector registers). Since your execution units are vector units, only a vectorized loop can use their full power.

Workaround

Try another compiler or update/tune your current one
Remove inter-iterations dependences from your loop and make it unit-stride:
- If your arrays have 2 or more dimensions, check whether elements are accessed contiguously and, otherwise, try to permute loops accordingly: C storage order is row-major: for(i) for(j) a[j][i] = b[j][i]; (slow, non stride 1) => for(i) for(j) a[i][j] = b[i][j]; (fast, stride 1)
- If your loop 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

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	28
nb uops	28
loop length	112
used w registers	0
used x registers	18
used b registers	0
used h registers	0
used s registers	0
used d registers	0
used q registers	0
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	3.50 cycles
front end	3.50 cycles

Back-end

	P0	P1	P2	P3	P4	P5	P6	P7	P8	P9	P10	P11	P12	P13	P14
uops	3.00	3.00	2.00	2.00	2.00	2.00	0.00	0.00	0.00	0.00	4.67	4.67	4.67	0.00	0.00
cycles	3.00	3.00	2.00	2.00	2.00	2.00	0.00	0.00	0.00	0.00	4.67	4.67	4.67	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

Cycles summary

Front-end	3.50
Dispatch	4.67
Overall L1	4.67

Vectorization ratios

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

Vector efficiency ratios

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

Cycles and memory resources usage

Assuming all data fit into the L1 cache, each iteration of the binary loop takes 4.67 cycles.

Front-end bottlenecks

Found no such bottlenecks.

ASM code

In the binary file, the address of the loop is: 434fa0

Instruction	Nb FU	P0	P1	P2	P3	P4	P5	P10	P11	P12	Latency	Recip. throughput	Vectorization
LDUR X10, [X29, #480]	1	0	0	0	0	0	0	0.33	0.33	0.33	4	0.33	N/A
LDR X5, [X19]	1	0	0	0	0	0	0	0.33	0.33	0.33	4	0.33	scal (25.0%)
LDR X4, [X10]	1	0	0	0	0	0	0	0.33	0.33	0.33	4	0.33	N/A
LDUR X10, [X29, #488]	1	0	0	0	0	0	0	0.33	0.33	0.33	4	0.33	N/A
LDR X6, [X10]	1	0	0	0	0	0	0	0.33	0.33	0.33	4	0.33	N/A
LDUR X10, [X29, #496]	1	0	0	0	0	0	0	0.33	0.33	0.33	4	0.33	N/A
LDR X7, [X10]	1	0	0	0	0	0	0	0.33	0.33	0.33	4	0.33	scal (25.0%)
B 434fb0 <hypre_BoomerAMGBuildMultipass.omp_outlined.9+0x2d0>	1	0.50	0.50	0	0	0	0	0	0	0	1	0.50	N/A
LDR X10, [X13, X2,LSL #3]	1	0	0	0	0	0	0	0.33	0.33	0.33	4	0.33	N/A
ADD X3, X3, #1	1	0	0	0.25	0.25	0.25	0.25	0	0	0	1	0.25	N/A
CMP X3, X10	1	0	0	0.25	0.25	0.25	0.25	0	0	0	1	0.33	scal (25.0%)
B.GE 435080 <hypre_BoomerAMGBuildMultipass.omp_outlined.9+0x3a0>	1	0.50	0.50	0	0	0	0	0	0	0	1	0.50	N/A
LDR X10, [X14, X3,LSL #3]	1	0	0	0	0	0	0	0.33	0.33	0.33	4	0.33	N/A
LDR X25, [X21]	1	0	0	0	0	0	0	0.33	0.33	0.33	4	0.33	scal (25.0%)
LDR X20, [X15, X10,LSL #3]	1	0	0	0	0	0	0	0.33	0.33	0.33	4	0.33	N/A
SUB X25, X25, #1	1	0	0	0.25	0.25	0.25	0.25	0	0	0	1	0.25	scal (25.0%)
CMP X20, X25	1	0	0	0.25	0.25	0.25	0.25	0	0	0	1	0.33	scal (25.0%)
B.NE 434fa0 <hypre_BoomerAMGBuildMultipass.omp_outlined.9+0x2c0>	1	0.50	0.50	0	0	0	0	0	0	0	1	0.50	N/A
ADD X26, X10, #1	1	0	0	0.25	0.25	0.25	0.25	0	0	0	1	0.25	N/A
LDR X20, [X4, X26,LSL #3]	1	0	0	0	0	0	0	0.33	0.33	0.33	4	0.33	N/A
CMP X20, #1	1	0	0	0.25	0.25	0.25	0.25	0	0	0	1	0.33	scal (25.0%)
B.LT 435024 <hypre_BoomerAMGBuildMultipass.omp_outlined.9+0x344>	1	0.50	0.50	0	0	0	0	0	0	0	1	0.50	N/A
LDR X30, [X11, X10,LSL #3]	1	0	0	0	0	0	0	0.33	0.33	0.33	4	0.33	scal (25.0%)
ADD X25, X20, X30	1	0	0	0.25	0.25	0.25	0.25	0	0	0	1	0.25	scal (25.0%)
B 434ff0 <hypre_BoomerAMGBuildMultipass.omp_outlined.9+0x310>	1	0.50	0.50	0	0	0	0	0	0	0	1	0.50	N/A
LDR X20, [X6, X26,LSL #3]	1	0	0	0	0	0	0	0.33	0.33	0.33	4	0.33	N/A
CMP X20, #1	1	0	0	0.25	0.25	0.25	0.25	0	0	0	1	0.33	N/A
B.LT 434fa0 <hypre_BoomerAMGBuildMultipass.omp_outlined.9+0x2c0>	1	0.50	0.50	0	0	0	0	0	0	0	1	0.50	N/A

Report Configuration

Vectorization

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

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