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exec - 2024-07-05 20:17:25 - MAQAO 2.20.4

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Strategizer  

[ 4 / 4 ] Enough time of the experiment time spent in analyzed loops (96.57%)

If the time spent in analyzed loops is less than 30%, standard loop optimizations will have a limited impact on application performances.

[ 4 / 4 ] Loop profile is not flat

At least one loop coverage is greater than 4% (48.07%), representing an hotspot for the application

[ 4 / 4 ] Enough time of the experiment time spent in analyzed innermost loops (16.28%)

If the time spent in analyzed innermost loops is less than 15%, standard innermost loop optimizations such as vectorisation will have a limited impact on application performances.

[ 3 / 3 ] Less than 10% (0.00%) is spend in BLAS1 operations

It could be more efficient to inline by hand BLAS1 operations

[ 0 / 3 ] Cumulative Outermost/In between loops coverage (80.30%) greater than cumulative innermost loop coverage (16.28%)

Having cumulative Outermost/In between loops coverage greater than cumulative innermost loop coverage will make loop optimization more complex

[ 2 / 2 ] Less than 10% (0.00%) is spend in Libm/SVML (special functions)

[ 2 / 2 ] Less than 10% (0.00%) is spend in BLAS2 operations

BLAS2 calls usually could make a poor cache usage and could benefit from inlining.

Optimizer

Loop IDAnalysisPenalty Score
Loop 44 - libparcsr_ls.so+Execution Time: 48 % - Vectorization Ratio: 64.46 % - Vector Length Use: 32.13 %
Loop Computation Issues+6
+[SA] Presence of expensive FP instructions - Perform hoisting, change algorithm, use SVML or proper numerical library or perform value profiling (count the number of distinct input values). There are 1 issues (= instructions) costing 4 points each.4
Number of DIV instructions: 1
[SA] Presence of a large number of scalar integer instructions - Simplify loop structure, perform loop splitting or perform unroll and jam. This issue costs 2 points.2
Control Flow Issues+1002
[SA] Too many paths (4097 paths) - Simplify control structure. There are 4097 issues ( = paths) costing 1 point, limited to 1000.1000
[SA] Non innermost loop (Outermost) - Collapse loop with innermost ones. This issue costs 2 points.2
Data Access Issues+70
+[SA] Presence of expensive instructions (GATHER/SCATTER) - Use array restructuring. There are 16 issues (= instructions) costing 4 points each.64
Number of XMM GATHER/SCATTER instructions: 2
Number of YMM GATHER/SCATTER instructions: 14
+[SA] Presence of special instructions executing on a single port (INSERT/EXTRACT, BLEND/MERGE) - Simplify data access and try to get stride 1 access. There are 6 issues (= instructions) costing 1 point each.6
Number of INSERT/EXTRACT instructions: 2
Number of XMM BLEND/MERGE instructions: 4
Vectorization Roadblocks+1002
[SA] Too many paths (4097 paths) - Simplify control structure. There are 4097 issues ( = paths) costing 1 point, limited to 1000.1000
[SA] Non innermost loop (Outermost) - Collapse loop with innermost ones. This issue costs 2 points.2
Inefficient Vectorization+70
[SA] Presence of expensive instructions (GATHER/SCATTER) - Use array restructuring. There are 16 issues (= instructions) costing 4 points each.64
+[SA] Presence of special instructions executing on a single port (INSERT/EXTRACT, BLEND/MERGE) - Simplify data access and try to get stride 1 access. There are 6 issues (= instructions) costing 1 point each.6
Number of INSERT/EXTRACT instructions: 2
Number of XMM BLEND/MERGE instructions: 4
Loop 147 - libseq_mv.so+Execution Time: 12 % - Vectorization Ratio: 62.90 % - Vector Length Use: 31.55 %
Loop Computation Issues+2
[SA] Presence of a large number of scalar integer instructions - Simplify loop structure, perform loop splitting or perform unroll and jam. This issue costs 2 points.2
Control Flow Issues+70
[SA] Too many paths (64 paths) - Simplify control structure. There are 64 issues ( = paths) costing 1 point each with a malus of 4 points.68
[SA] Non innermost loop (Outermost) - Collapse loop with innermost ones. This issue costs 2 points.2
Data Access Issues+35
+[SA] Presence of expensive instructions (GATHER/SCATTER) - Use array restructuring. There are 8 issues (= instructions) costing 4 points each.32
Number of XMM GATHER/SCATTER instructions: 1
Number of YMM GATHER/SCATTER instructions: 7
+[SA] Presence of special instructions executing on a single port (INSERT/EXTRACT, BLEND/MERGE) - Simplify data access and try to get stride 1 access. There are 3 issues (= instructions) costing 1 point each.3
Number of INSERT/EXTRACT instructions: 1
Number of XMM BLEND/MERGE instructions: 2
Vectorization Roadblocks+70
[SA] Too many paths (64 paths) - Simplify control structure. There are 64 issues ( = paths) costing 1 point each with a malus of 4 points.68
[SA] Non innermost loop (Outermost) - Collapse loop with innermost ones. This issue costs 2 points.2
Inefficient Vectorization+35
[SA] Presence of expensive instructions (GATHER/SCATTER) - Use array restructuring. There are 8 issues (= instructions) costing 4 points each.32
+[SA] Presence of special instructions executing on a single port (INSERT/EXTRACT, BLEND/MERGE) - Simplify data access and try to get stride 1 access. There are 3 issues (= instructions) costing 1 point each.3
Number of INSERT/EXTRACT instructions: 1
Number of XMM BLEND/MERGE instructions: 2
Loop 130 - libseq_mv.so+Execution Time: 10 % - Vectorization Ratio: 66.10 % - Vector Length Use: 32.52 %
Loop Computation Issues+2
[SA] Presence of a large number of scalar integer instructions - Simplify loop structure, perform loop splitting or perform unroll and jam. This issue costs 2 points.2
Control Flow Issues+2
[SA] Non innermost loop (InBetween) - Collapse loop with innermost ones. This issue costs 2 points.2
Data Access Issues+35
+[SA] Presence of expensive instructions (GATHER/SCATTER) - Use array restructuring. There are 8 issues (= instructions) costing 4 points each.32
Number of XMM GATHER/SCATTER instructions: 1
Number of YMM GATHER/SCATTER instructions: 7
+[SA] Presence of special instructions executing on a single port (INSERT/EXTRACT, BLEND/MERGE) - Simplify data access and try to get stride 1 access. There are 3 issues (= instructions) costing 1 point each.3
Number of INSERT/EXTRACT instructions: 1
Number of XMM BLEND/MERGE instructions: 2
Vectorization Roadblocks+1002
[SA] Too many paths (at least 1000 paths) - Simplify control structure. There are at least 1000 issues ( = paths) costing 1 point.1000
[SA] Non innermost loop (InBetween) - Collapse loop with innermost ones. This issue costs 2 points.2
Inefficient Vectorization+35
[SA] Presence of expensive instructions (GATHER/SCATTER) - Use array restructuring. There are 8 issues (= instructions) costing 4 points each.32
+[SA] Presence of special instructions executing on a single port (INSERT/EXTRACT, BLEND/MERGE) - Simplify data access and try to get stride 1 access. There are 3 issues (= instructions) costing 1 point each.3
Number of INSERT/EXTRACT instructions: 1
Number of XMM BLEND/MERGE instructions: 2
Loop 62 - libparcsr_ls.so+Execution Time: 2 % - Vectorization Ratio: 100.00 % - Vector Length Use: 50.00 %
Data Access Issues+4
[SA] Inefficient vectorization: more than 10% of the vector loads instructions are unaligned - When allocating arrays, don’t forget to align them. There are 2 issues ( = arrays) costing 2 points each4
Loop 139 - libseq_mv.so+Execution Time: 1 % - Vectorization Ratio: 62.90 % - Vector Length Use: 31.55 %
Loop Computation Issues+2
[SA] Presence of a large number of scalar integer instructions - Simplify loop structure, perform loop splitting or perform unroll and jam. This issue costs 2 points.2
Control Flow Issues+70
[SA] Too many paths (64 paths) - Simplify control structure. There are 64 issues ( = paths) costing 1 point each with a malus of 4 points.68
[SA] Non innermost loop (Outermost) - Collapse loop with innermost ones. This issue costs 2 points.2
Data Access Issues+35
+[SA] Presence of expensive instructions (GATHER/SCATTER) - Use array restructuring. There are 8 issues (= instructions) costing 4 points each.32
Number of XMM GATHER/SCATTER instructions: 1
Number of YMM GATHER/SCATTER instructions: 7
+[SA] Presence of special instructions executing on a single port (INSERT/EXTRACT, BLEND/MERGE) - Simplify data access and try to get stride 1 access. There are 3 issues (= instructions) costing 1 point each.3
Number of INSERT/EXTRACT instructions: 1
Number of XMM BLEND/MERGE instructions: 2
Vectorization Roadblocks+70
[SA] Too many paths (64 paths) - Simplify control structure. There are 64 issues ( = paths) costing 1 point each with a malus of 4 points.68
[SA] Non innermost loop (Outermost) - Collapse loop with innermost ones. This issue costs 2 points.2
Inefficient Vectorization+35
[SA] Presence of expensive instructions (GATHER/SCATTER) - Use array restructuring. There are 8 issues (= instructions) costing 4 points each.32
+[SA] Presence of special instructions executing on a single port (INSERT/EXTRACT, BLEND/MERGE) - Simplify data access and try to get stride 1 access. There are 3 issues (= instructions) costing 1 point each.3
Number of INSERT/EXTRACT instructions: 1
Number of XMM BLEND/MERGE instructions: 2
Loop 42 - libseq_mv.so+Execution Time: 1 % - Vectorization Ratio: 100.00 % - Vector Length Use: 50.00 %
Data Access Issues+4
[SA] Inefficient vectorization: more than 10% of the vector loads instructions are unaligned - When allocating arrays, don’t forget to align them. There are 2 issues ( = arrays) costing 2 points each4
Loop 32 - libseq_mv.so+Execution Time: 1 % - Vectorization Ratio: 0.00 % - Vector Length Use: 12.50 %
Loop Computation Issues+2
[SA] Presence of a large number of scalar integer instructions - Simplify loop structure, perform loop splitting or perform unroll and jam. This issue costs 2 points.2
Control Flow Issues+22
[SA] Too many paths (16 paths) - Simplify control structure. There are 16 issues ( = paths) costing 1 point each with a malus of 4 points.20
[SA] Non innermost loop (Outermost) - Collapse loop with innermost ones. This issue costs 2 points.2
Vectorization Roadblocks+22
[SA] Too many paths (16 paths) - Simplify control structure. There are 16 issues ( = paths) costing 1 point each with a malus of 4 points.20
[SA] Non innermost loop (Outermost) - Collapse loop with innermost ones. This issue costs 2 points.2
Loop 36 - libIJ_mv.so+Execution Time: 1 % - Vectorization Ratio: 0.00 % - Vector Length Use: 12.50 %
Control Flow Issues+330
[SA] Too many paths (324 paths) - Simplify control structure. There are 324 issues ( = paths) costing 1 point each with a malus of 4 points.328
[SA] Non innermost loop (InBetween) - Collapse loop with innermost ones. This issue costs 2 points.2
Data Access Issues+2
[SA] More than 20% of the loads are accessing the stack - Perform loop splitting to decrease pressure on registers. This issue costs 2 points.2
Vectorization Roadblocks+330
[SA] Too many paths (324 paths) - Simplify control structure. There are 324 issues ( = paths) costing 1 point each with a malus of 4 points.328
[SA] Non innermost loop (InBetween) - Collapse loop with innermost ones. This issue costs 2 points.2
Loop 25 - libparcsr_mv.so+Execution Time: 0 % - Vectorization Ratio: 0.00 % - Vector Length Use: 12.50 %
Loop Computation Issues+6
[SA] Less than 10% of the FP ADD/SUB/MUL arithmetic operations are performed using FMA - Reorganize arithmetic expressions to exhibit potential for FMA. This issue costs 4 points.4
[SA] Presence of a large number of scalar integer instructions - Simplify loop structure, perform loop splitting or perform unroll and jam. This issue costs 2 points.2
Control Flow Issues+2
[SA] Several paths (2 paths) - Simplify control structure or force the compiler to use masked instructions. There are 2 issues ( = paths) costing 1 point each.2
Data Access Issues+4
[SA] Presence of constant non unit stride data access - Use array restructuring, perform loop interchange or use gather instructions to lower a bit the cost. There are 2 issues ( = data accesses) costing 2 point each.4
Vectorization Roadblocks+6
[SA] Several paths (2 paths) - Simplify control structure or force the compiler to use masked instructions. There are 2 issues ( = paths) costing 1 point each.2
[SA] Presence of constant non unit stride data access - Use array restructuring, perform loop interchange or use gather instructions to lower a bit the cost. There are 2 issues ( = data accesses) costing 2 point each.4
Loop 902 - libparcsr_ls.so+Execution Time: 0 % - Vectorization Ratio: 0.00 % - Vector Length Use: 12.50 %
Loop Computation Issues+6
[SA] Less than 10% of the FP ADD/SUB/MUL arithmetic operations are performed using FMA - Reorganize arithmetic expressions to exhibit potential for FMA. This issue costs 4 points.4
[SA] Presence of a large number of scalar integer instructions - Simplify loop structure, perform loop splitting or perform unroll and jam. This issue costs 2 points.2
Control Flow Issues+74
[SA] Too many paths (68 paths) - Simplify control structure. There are 68 issues ( = paths) costing 1 point each with a malus of 4 points.72
[SA] Non innermost loop (InBetween) - Collapse loop with innermost ones. This issue costs 2 points.2
Vectorization Roadblocks+74
[SA] Too many paths (68 paths) - Simplify control structure. There are 68 issues ( = paths) costing 1 point each with a malus of 4 points.72
[SA] Non innermost loop (InBetween) - Collapse loop with innermost ones. This issue costs 2 points.2
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