OV - exec - Function hypre

	Function: hypre_Rand	Module: exec	Source: random.c:76-116 [...]	Coverage (incl. loops): 0.04% \| (excl. loops): 0.04%

/home/hbollore/qaas/qaas-runs/174-161-6712/intel/AMG/build/AMG/AMG/utilities/random.c: 76 - 116

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

76:    high = Seed / q;

77:    low = Seed % q;

78:    test = a * low - r * high;

[...]

85:       Seed = test + m;

[...]

115:    return ((HYPRE_Real)(hypre_RandI()) / m);

116: }

0x52dea4 ADRP	X5,

0x52dea8 MOVZ	X0, #64377

0x52deac LDR	X4, [X5, #760]

0x52deb0 MOVK	X0, #8163

0x52deb4 MOVZ	X1, #62237

0x52deb8 MOVK	X0, #1455

0x52debc MOVK	X1, #1

0x52dec0 MOVK	X0, #16807

0x52dec4 MOVN	X7, #2835

0x52dec8 ORR	X3, XZR, #5738

0x52decc MOVZ	X6, #16807

0x52ded0 MOVK	X3, #16863

0x52ded4 ORR	X2, XZR, #6016

0x52ded8 SMULH	X8, X4, X0

0x52dedc FMOV	D31, X3

0x52dee0 SBFM	X9, X8, #15, #63

0x52dee4 SUB	X10, X9, X4,ASR #63

0x52dee8 MSUB	X11, X10, X1, X4

0x52deec MADD	X12, X10, X7, XZR

0x52def0 MADD	X13, X11, X6, X12

0x52def4 CMP	X13, #0

0x52def8 ADD	X14, X13, X2

0x52defc CSEL	X15, X14, X13, #13

0x52df00 SCVTF	D0, X15

0x52df04 STR	X15, [X5, #760]

0x52df08 FDIV	D0, D0, D31

0x52df0c RET

0x52df10 HINT	#0

0x52df14 HINT	#0

0x52df18 HINT	#0

0x52df1c HINT	#0

Coverage (%)	Name	Source Location	Module
►92.94+	hypre_BoomerAMGCoarsenPMIS	par_coarsen.c:2186	exec
○	hypre_BoomerAMGSetup	par_amg_setup.c:612	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	amg.c:253	exec
►7.06+	hypre_BoomerAMGCoarsenPMIS	par_coarsen.c:2186	exec
○	hypre_BoomerAMGSetup	par_amg_setup.c:638	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	amg.c:253	exec

min	med	avg	max

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

min	med	avg	max

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

Path /

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

The code analyzed by CQA in that panel excludes loops and represents 0.04% of application time for run gcc_0

Source file and lines	random.c:76-116
Module	exec

The function is defined in /home/hbollore/qaas/qaas-runs/174-161-6712/intel/AMG/build/AMG/AMG/utilities/random.c:76-78,85,115-116.

gain
potential
hint
expert

Vectorization

Your function is not vectorized. Only 52% of vector register length is used (average across all VPU instructions). By vectorizing your function, you can lower the cost of an iteration from 4.00 to 3.00 cycles (1.33x 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 function can use their full power.

Workaround

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

No data for this section

Conversion instructions

Detected expensive conversion instructions.

Details

SCVTF: 1 occurrences►
- /home/hbollore/qaas/qaas-runs/174-161-6712/intel/AMG/build/AMG/AMG/utilities/random.c:115

Workaround

Avoid mixing data with different types. In particular, check if the type of constants is the same as array elements.

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

The binary function is composed of 1 FP arithmetical operations:

1: divide

The binary function is loading 8 bytes. The binary function is storing 8 bytes.

Arithmetic intensity

Arithmetic intensity is 0.06 FP operations per loaded or stored byte.

General properties

nb instructions	31
loop length	124
nb stack references	0

Front-end

FIT IN UOP CACHE

front end

3.38 cycles

Back-end

	P0	P1	P2	P3	P4	P5	P6	P7	P8	P9	P10	P11	P12	P13	P14	P15	P16
uops	0.50	0.50	3.50	3.50	3.67	3.67	4.00	3.67	0.50	0.50	0.50	0.50	0.83	0.50	0.67	0.50	0.50
cycles	0.50	0.50	3.50	3.50	3.67	3.67	4.00	3.67	0.50	0.50	0.50	0.50	0.83	0.50	0.67	0.50	0.50

Execution ports to units layout:

P0: BRU
P1: BRU
P2: ALU
P3: ALU
P4: ALU
P5: ALU
P6: ALU
P7: ALU
P8 (128 bits): VPU, FP store data, ALU, DIV/SQRT
P9 (128 bits): VPU, ALU, FP store data
P10 (128 bits): VPU, ALU, DIV/SQRT
P11 (128 bits): ALU, VPU
P12 (256 bits): store address, load
P13 (256 bits): store address, load
P14 (256 bits): load
P15 (64 bits): store data
P16 (64 bits): store data

Cycles executing div or sqrt instructions

1.75-3.50

Cycles summary

Front-end	3.38
Overall L1	4.00

Vectorization ratios

INT

all	0%
load	0%
store	0%
mul	0%
add-sub	0%
fma	0%
other	0%

all	0%
load	NA (no load vectorizable/vectorized instructions)
store	NA (no store vectorizable/vectorized instructions)
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	0%
other	0%

INT+FP

all	0%
load	0%
store	0%
mul	0%
add-sub	0%
fma	0%
div/sqrt	0%
other	0%

Cycles and memory resources usage

Assuming all data fit into the L1 cache, each call to the function takes 4.00 cycles. At this rate:

2% of peak load performance is reached (2.00 out of 96.00 bytes loaded per cycle (GB/s @ 1GHz))
4% of peak store performance is reached (2.00 out of 48.00 bytes stored per cycle (GB/s @ 1GHz))

ASM code

In the binary file, the address of the function is: 52dea4

Instruction	Nb FU	P0	P1	P2	P3	P4	P5	P6	P7	P8	P9	P10	P11	P12	P13	P14	P15	P16	Latency	Recip. throughput	Vectorization
ADRP X5, <560ea4>	1	0	0	0.25	0.25	0	0	0.25	0.25	0	0	0	0	0	0	0	0	0	1	0.25	N/A
MOVZ X0, #64377	1	0	0	0.17	0.17	0.17	0.17	0.17	0.17	0	0	0	0	0	0	0	0	0	1	0.17	scal (50.0%)
LDR X4, [X5, #760]	1	0	0	0	0	0	0	0	0	0	0	0	0	0.33	0.33	0.33	0	0	4	0.33	scal (50.0%)
MOVK X0, #8163	1	0	0	0.17	0.17	0.17	0.17	0.17	0.17	0	0	0	0	0	0	0	0	0	1	0.17	scal (50.0%)
MOVZ X1, #62237	1	0	0	0.17	0.17	0.17	0.17	0.17	0.17	0	0	0	0	0	0	0	0	0	1	0.17	scal (50.0%)
MOVK X0, #1455	1	0	0	0.17	0.17	0.17	0.17	0.17	0.17	0	0	0	0	0	0	0	0	0	1	0.17	scal (50.0%)
MOVK X1, #1	1	0	0	0.17	0.17	0.17	0.17	0.17	0.17	0	0	0	0	0	0	0	0	0	1	0.17	scal (50.0%)
MOVK X0, #16807	1	0	0	0.17	0.17	0.17	0.17	0.17	0.17	0	0	0	0	0	0	0	0	0	1	0.17	scal (50.0%)
MOVN X7, #2835	1	0	0	0.17	0.17	0.17	0.17	0.17	0.17	0	0	0	0	0	0	0	0	0	1	0.17	scal (50.0%)
ORR X3, XZR, #5738	1	0	0	0.17	0.17	0.17	0.17	0.17	0.17	0	0	0	0	0	0	0	0	0	1	0.17	scal (50.0%)
MOVZ X6, #16807	1	0	0	0.17	0.17	0.17	0.17	0.17	0.17	0	0	0	0	0	0	0	0	0	1	0.17	scal (50.0%)
MOVK X3, #16863	1	0	0	0.17	0.17	0.17	0.17	0.17	0.17	0	0	0	0	0	0	0	0	0	1	0.17	scal (50.0%)
ORR X2, XZR, #6016	1	0	0	0.17	0.17	0.17	0.17	0.17	0.17	0	0	0	0	0	0	0	0	0	1	0.17	N/A
SMULH X8, X4, X0	1	0	0	0	0	0	0	0.50	0.50	0	0	0	0	0	0	0	0	0	3	0.50	scal (50.0%)
FMOV D31, X3	1	0	0	0	0	0	0	0	0	0.25	0.25	0.25	0.25	0	0	0	0	0	2	0.25	scal (50.0%)
SBFM X9, X8, #15, #63	1	0	0	0.17	0.17	0.17	0.17	0.17	0.17	0	0	0	0	0	0	0	0	0	1	0.17	scal (100.0%)
SUB X10, X9, X4,ASR #63	1	0	0	0	0	0	0	0.50	0.50	0	0	0	0	0	0	0	0	0	2	0.50	scal (50.0%)
MSUB X11, X10, X1, X4	1	0	0	0	0	0	0	1	0	0	0	0	0	0	0	0	0	0	2	1	scal (50.0%)
MADD X12, X10, X7, XZR	1	0	0	0	0	0	0	1	0	0	0	0	0	0	0	0	0	0	2	1	scal (50.0%)
MADD X13, X11, X6, X12	1	0	0	0	0	0	0	1	0	0	0	0	0	0	0	0	0	0	2	1	N/A
CMP X13, #0	1	0	0	0.25	0.25	0	0	0.25	0.25	0	0	0	0	0	0	0	0	0	1	0.33	scal (50.0%)
ADD X14, X13, X2	1	0	0	0.17	0.17	0.17	0.17	0.17	0.17	0	0	0	0	0	0	0	0	0	1	0.17	N/A
CSEL X15, X14, X13, #13	1	0	0	0.17	0.17	0.17	0.17	0.17	0.17	0	0	0	0	0	0	0	0	0	1	0.17	scal (50.0%)
SCVTF D0, X15	1	0	0	0	0	0	0	1	0	0	0	0	0	0	0	0	0	0	3	1	scal (50.0%)
STR X15, [X5, #760]	1	0	0	0	0	0	0	0	0	0	0	0	0	0.50	0.50	0	0.50	0.50	1	0.50	scal (50.0%)
FDIV D0, D0, D31	1	0	0	0	0	0	0	0	0	0.50	0	0.50	0	0	0	0	0	0	7-15	1.75-3.50	scal (50.0%)
RET	1	0.50	0.50	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	1	0.50	N/A
HINT #0																					N/A
HINT #0																					N/A
HINT #0																					N/A
HINT #0																					N/A

The code analyzed by CQA in that panel excludes loops and represents 0.04% of application time for run gcc_0

Source file and lines	random.c:76-116
Module	exec

The function is defined in /home/hbollore/qaas/qaas-runs/174-161-6712/intel/AMG/build/AMG/AMG/utilities/random.c:76-78,85,115-116.

gain
potential
hint
expert

Vectorization

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 function can use their full power.

Workaround

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

No data for this section

Conversion instructions

Detected expensive conversion instructions.

Details

SCVTF: 1 occurrences►
- /home/hbollore/qaas/qaas-runs/174-161-6712/intel/AMG/build/AMG/AMG/utilities/random.c:115

Workaround

Avoid mixing data with different types. In particular, check if the type of constants is the same as array elements.

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

The binary function is composed of 1 FP arithmetical operations:

1: divide

The binary function is loading 8 bytes. The binary function is storing 8 bytes.

Arithmetic intensity

Arithmetic intensity is 0.06 FP operations per loaded or stored byte.

General properties

nb instructions	31
loop length	124
nb stack references	0

Front-end

FIT IN UOP CACHE

front end

3.38 cycles

Back-end

	P0	P1	P2	P3	P4	P5	P6	P7	P8	P9	P10	P11	P12	P13	P14	P15	P16
uops	0.50	0.50	3.50	3.50	3.67	3.67	4.00	3.67	0.50	0.50	0.50	0.50	0.83	0.50	0.67	0.50	0.50
cycles	0.50	0.50	3.50	3.50	3.67	3.67	4.00	3.67	0.50	0.50	0.50	0.50	0.83	0.50	0.67	0.50	0.50

Execution ports to units layout:

P0: BRU
P1: BRU
P2: ALU
P3: ALU
P4: ALU
P5: ALU
P6: ALU
P7: ALU
P8 (128 bits): VPU, FP store data, ALU, DIV/SQRT
P9 (128 bits): VPU, ALU, FP store data
P10 (128 bits): VPU, ALU, DIV/SQRT
P11 (128 bits): ALU, VPU
P12 (256 bits): store address, load
P13 (256 bits): store address, load
P14 (256 bits): load
P15 (64 bits): store data
P16 (64 bits): store data

Cycles executing div or sqrt instructions

1.75-3.50

Cycles summary

Front-end	3.38
Overall L1	4.00

Vectorization ratios

INT

all	0%
load	0%
store	0%
mul	0%
add-sub	0%
fma	0%
other	0%

all	0%
load	NA (no load vectorizable/vectorized instructions)
store	NA (no store vectorizable/vectorized instructions)
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	0%
other	0%

INT+FP

all	0%
load	0%
store	0%
mul	0%
add-sub	0%
fma	0%
div/sqrt	0%
other	0%

Cycles and memory resources usage

Assuming all data fit into the L1 cache, each call to the function takes 4.00 cycles. At this rate:

2% of peak load performance is reached (2.00 out of 96.00 bytes loaded per cycle (GB/s @ 1GHz))
4% of peak store performance is reached (2.00 out of 48.00 bytes stored per cycle (GB/s @ 1GHz))

ASM code

In the binary file, the address of the function is: 52dea4

Instruction	Nb FU	P0	P1	P2	P3	P4	P5	P6	P7	P8	P9	P10	P11	P12	P13	P14	P15	P16	Latency	Recip. throughput	Vectorization
ADRP X5, <560ea4>	1	0	0	0.25	0.25	0	0	0.25	0.25	0	0	0	0	0	0	0	0	0	1	0.25	N/A
MOVZ X0, #64377	1	0	0	0.17	0.17	0.17	0.17	0.17	0.17	0	0	0	0	0	0	0	0	0	1	0.17	scal (50.0%)
LDR X4, [X5, #760]	1	0	0	0	0	0	0	0	0	0	0	0	0	0.33	0.33	0.33	0	0	4	0.33	scal (50.0%)
MOVK X0, #8163	1	0	0	0.17	0.17	0.17	0.17	0.17	0.17	0	0	0	0	0	0	0	0	0	1	0.17	scal (50.0%)
MOVZ X1, #62237	1	0	0	0.17	0.17	0.17	0.17	0.17	0.17	0	0	0	0	0	0	0	0	0	1	0.17	scal (50.0%)
MOVK X0, #1455	1	0	0	0.17	0.17	0.17	0.17	0.17	0.17	0	0	0	0	0	0	0	0	0	1	0.17	scal (50.0%)
MOVK X1, #1	1	0	0	0.17	0.17	0.17	0.17	0.17	0.17	0	0	0	0	0	0	0	0	0	1	0.17	scal (50.0%)
MOVK X0, #16807	1	0	0	0.17	0.17	0.17	0.17	0.17	0.17	0	0	0	0	0	0	0	0	0	1	0.17	scal (50.0%)
MOVN X7, #2835	1	0	0	0.17	0.17	0.17	0.17	0.17	0.17	0	0	0	0	0	0	0	0	0	1	0.17	scal (50.0%)
ORR X3, XZR, #5738	1	0	0	0.17	0.17	0.17	0.17	0.17	0.17	0	0	0	0	0	0	0	0	0	1	0.17	scal (50.0%)
MOVZ X6, #16807	1	0	0	0.17	0.17	0.17	0.17	0.17	0.17	0	0	0	0	0	0	0	0	0	1	0.17	scal (50.0%)
MOVK X3, #16863	1	0	0	0.17	0.17	0.17	0.17	0.17	0.17	0	0	0	0	0	0	0	0	0	1	0.17	scal (50.0%)
ORR X2, XZR, #6016	1	0	0	0.17	0.17	0.17	0.17	0.17	0.17	0	0	0	0	0	0	0	0	0	1	0.17	N/A
SMULH X8, X4, X0	1	0	0	0	0	0	0	0.50	0.50	0	0	0	0	0	0	0	0	0	3	0.50	scal (50.0%)
FMOV D31, X3	1	0	0	0	0	0	0	0	0	0.25	0.25	0.25	0.25	0	0	0	0	0	2	0.25	scal (50.0%)
SBFM X9, X8, #15, #63	1	0	0	0.17	0.17	0.17	0.17	0.17	0.17	0	0	0	0	0	0	0	0	0	1	0.17	scal (100.0%)
SUB X10, X9, X4,ASR #63	1	0	0	0	0	0	0	0.50	0.50	0	0	0	0	0	0	0	0	0	2	0.50	scal (50.0%)
MSUB X11, X10, X1, X4	1	0	0	0	0	0	0	1	0	0	0	0	0	0	0	0	0	0	2	1	scal (50.0%)
MADD X12, X10, X7, XZR	1	0	0	0	0	0	0	1	0	0	0	0	0	0	0	0	0	0	2	1	scal (50.0%)
MADD X13, X11, X6, X12	1	0	0	0	0	0	0	1	0	0	0	0	0	0	0	0	0	0	2	1	N/A
CMP X13, #0	1	0	0	0.25	0.25	0	0	0.25	0.25	0	0	0	0	0	0	0	0	0	1	0.33	scal (50.0%)
ADD X14, X13, X2	1	0	0	0.17	0.17	0.17	0.17	0.17	0.17	0	0	0	0	0	0	0	0	0	1	0.17	N/A
CSEL X15, X14, X13, #13	1	0	0	0.17	0.17	0.17	0.17	0.17	0.17	0	0	0	0	0	0	0	0	0	1	0.17	scal (50.0%)
SCVTF D0, X15	1	0	0	0	0	0	0	1	0	0	0	0	0	0	0	0	0	0	3	1	scal (50.0%)
STR X15, [X5, #760]	1	0	0	0	0	0	0	0	0	0	0	0	0	0.50	0.50	0	0.50	0.50	1	0.50	scal (50.0%)
FDIV D0, D0, D31	1	0	0	0	0	0	0	0	0	0.50	0	0.50	0	0	0	0	0	0	7-15	1.75-3.50	scal (50.0%)
RET	1	0.50	0.50	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	1	0.50	N/A
HINT #0																					N/A
HINT #0																					N/A
HINT #0																					N/A
HINT #0																					N/A

Name	Coverage (%)	Time (s)
○hypre_Rand	0.04	0.01

Report Configuration

Vectorization

Details

Workaround

Conversion instructions

Details

Workaround

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

Arithmetic intensity

General properties

Front-end

Back-end

Cycles summary

Vectorization ratios

Cycles and memory resources usage

ASM code

Vectorization

Details

Workaround

Conversion instructions

Details

Workaround

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

Arithmetic intensity

General properties

Front-end

Back-end

Cycles summary

Vectorization ratios

Cycles and memory resources usage

ASM code