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[ 4 / 4 ] Application profile is long enough (801.78 s)
To have good quality measurements, it is advised that the application profiling time is greater than 10 seconds.
[ 2.96 / 3 ] Optimization level option is correctly used
[ 2.95 / 3 ] Most of time spent in analyzed modules comes from functions compiled with -g and -fno-omit-frame-pointer
-g option gives access to debugging informations, such are source locations. -fno-omit-frame-pointer improve the accuracy of callchains found during the application profiling.
[ 2.95 / 3 ] Architecture specific option -march=skylake-avx512 is used
[ 2 / 2 ] Application is correctly profiled ("Others" category represents 0.00 % of the execution time)
To have a representative profiling, it is advised that the category "Others" represents less than 20% of the execution time in order to analyze as much as possible of the user code
[ 4 / 4 ] Enough time of the experiment time spent in analyzed loops (91.36%)
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% (37.11%), representing an hotspot for the application
[ 4 / 4 ] Enough time of the experiment time spent in analyzed innermost loops (79.92%)
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
[ 3 / 3 ] Cumulative Outermost/In between loops coverage (11.44%) lower than cumulative innermost loop coverage (79.92%)
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.
| Loop ID | Analysis | Penalty Score |
|---|---|---|
| ►Loop 891 - libgromacs_mpi.so.9.0.0 | Execution Time: 37 % - Vectorization Ratio: 89.44 % - Vector Length Use: 83.62 % | |
| ►Loop Computation Issues | 256 | |
| ► | [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 64 issues (= instructions) costing 4 points each. | 256 |
| ○ | Number of RCP instructions: 32 Number of RSQRT instructions: 32 | |
| ►Data Access Issues | 61 | |
| ○ | [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 6 issues ( = data accesses) costing 2 point each. | 12 |
| ○ | [SA] Presence of indirect accesses - Use array restructuring or gather instructions to lower the cost. There are 1 issues ( = indirect data accesses) costing 4 point each. | 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 9 issues ( = arrays) costing 2 points each | 18 |
| ► | [SA] Presence of special instructions executing on a single port (INSERT/EXTRACT, BROADCAST) - Simplify data access and try to get stride 1 access. There are 25 issues (= instructions) costing 1 point each. | 25 |
| ○ | Number of INSERT/EXTRACT instructions: 3 Number of ZMM BROADCAST instructions: 22 | |
| ○ | [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 | 16 | |
| ○ | [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 6 issues ( = data accesses) costing 2 point each. | 12 |
| ○ | [SA] Presence of indirect accesses - Use array restructuring or gather instructions to lower the cost. There are 1 issues ( = indirect data accesses) costing 4 point each. | 4 |
| ►Inefficient Vectorization | 27 | |
| ► | [SA] Presence of special instructions executing on a single port (INSERT/EXTRACT, BROADCAST) - Simplify data access and try to get stride 1 access. There are 25 issues (= instructions) costing 1 point each. | 25 |
| ○ | Number of INSERT/EXTRACT instructions: 3 Number of ZMM BROADCAST instructions: 22 | |
| ○ | [SA] Inefficient vectorization: use of masked instructions - Simplify control structure. The issue costs 2 points. | 2 |
| ►Loop 889 - libgromacs_mpi.so.9.0.0 | Execution Time: 14 % - Vectorization Ratio: 89.82 % - Vector Length Use: 84.21 % | |
| ►Loop Computation Issues | 256 | |
| ► | [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 64 issues (= instructions) costing 4 points each. | 256 |
| ○ | Number of RCP instructions: 32 Number of RSQRT instructions: 32 | |
| ►Data Access Issues | 61 | |
| ○ | [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 6 issues ( = data accesses) costing 2 point each. | 12 |
| ○ | [SA] Presence of indirect accesses - Use array restructuring or gather instructions to lower the cost. There are 1 issues ( = indirect data accesses) costing 4 point each. | 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 9 issues ( = arrays) costing 2 points each | 18 |
| ► | [SA] Presence of special instructions executing on a single port (INSERT/EXTRACT, BROADCAST) - Simplify data access and try to get stride 1 access. There are 25 issues (= instructions) costing 1 point each. | 25 |
| ○ | Number of INSERT/EXTRACT instructions: 3 Number of ZMM BROADCAST instructions: 22 | |
| ○ | [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 | 16 | |
| ○ | [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 6 issues ( = data accesses) costing 2 point each. | 12 |
| ○ | [SA] Presence of indirect accesses - Use array restructuring or gather instructions to lower the cost. There are 1 issues ( = indirect data accesses) costing 4 point each. | 4 |
| ►Inefficient Vectorization | 27 | |
| ► | [SA] Presence of special instructions executing on a single port (INSERT/EXTRACT, BROADCAST) - Simplify data access and try to get stride 1 access. There are 25 issues (= instructions) costing 1 point each. | 25 |
| ○ | Number of INSERT/EXTRACT instructions: 3 Number of ZMM BROADCAST instructions: 22 | |
| ○ | [SA] Inefficient vectorization: use of masked instructions - Simplify control structure. The issue costs 2 points. | 2 |
| ►Loop 898 - libgromacs_mpi.so.9.0.0 | Execution Time: 6 % - Vectorization Ratio: 88.70 % - Vector Length Use: 84.84 % | |
| ►Loop Computation Issues | 384 | |
| ► | [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 96 issues (= instructions) costing 4 points each. | 384 |
| ○ | Number of RCP instructions: 64 Number of RSQRT instructions: 32 | |
| ►Data Access Issues | 77 | |
| ○ | [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 3 issues ( = data accesses) costing 2 point each. | 6 |
| ○ | [SA] Presence of indirect accesses - Use array restructuring or gather instructions to lower the cost. There are 4 issues ( = indirect data accesses) costing 4 point each. | 16 |
| ○ | [SA] Inefficient vectorization: more than 10% of the vector loads instructions are unaligned - When allocating arrays, don’t forget to align them. There are 9 issues ( = arrays) costing 2 points each | 18 |
| ► | [SA] Presence of special instructions executing on a single port (INSERT/EXTRACT, BROADCAST) - Simplify data access and try to get stride 1 access. There are 35 issues (= instructions) costing 1 point each. | 35 |
| ○ | Number of INSERT/EXTRACT instructions: 3 Number of ZMM BROADCAST instructions: 32 | |
| ○ | [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 | 22 | |
| ○ | [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 3 issues ( = data accesses) costing 2 point each. | 6 |
| ○ | [SA] Presence of indirect accesses - Use array restructuring or gather instructions to lower the cost. There are 4 issues ( = indirect data accesses) costing 4 point each. | 16 |
| ►Inefficient Vectorization | 37 | |
| ► | [SA] Presence of special instructions executing on a single port (INSERT/EXTRACT, BROADCAST) - Simplify data access and try to get stride 1 access. There are 35 issues (= instructions) costing 1 point each. | 35 |
| ○ | Number of INSERT/EXTRACT instructions: 3 Number of ZMM BROADCAST instructions: 32 | |
| ○ | [SA] Inefficient vectorization: use of masked instructions - Simplify control structure. The issue costs 2 points. | 2 |
| ►Loop 17268 - libgromacs_mpi.so.9.0.0 | Execution Time: 4 % - Vectorization Ratio: 63.64 % - Vector Length Use: 38.76 % | |
| ►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 | 32 | |
| ○ | [SA] Too many paths (26 paths) - Simplify control structure. There are 26 issues ( = paths) costing 1 point each with a malus of 4 points. | 30 |
| ○ | [SA] Non innermost loop (Outermost) - Collapse loop with innermost ones. This issue costs 2 points. | 2 |
| ►Data Access Issues | 54 | |
| ○ | [SA] Inefficient vectorization: more than 10% of the vector loads instructions are unaligned - When allocating arrays, don’t forget to align them. There are 0 issues ( = arrays) costing 2 points each | 0 |
| ► | [SA] Presence of expensive instructions (GATHER/SCATTER) - Use array restructuring. There are 4 issues (= instructions) costing 4 points each. | 16 |
| ○ | Number of ZMM GATHER/SCATTER instructions: 4 | |
| ► | [SA] Presence of special instructions executing on a single port (INSERT/EXTRACT, COMPRESS/EXPAND, SHUFFLE/PERM, BROADCAST) - Simplify data access and try to get stride 1 access. There are 36 issues (= instructions) costing 1 point each. | 36 |
| ○ | Number of INSERT/EXTRACT instructions: 10 Number of ZMM COMPRESS/EXPAND instructions: 2 Number of XMM SHUFFLE/PERM instructions: 7 Number of ZMM SHUFFLE/PERM instructions: 5 Number of XMM BROADCAST instructions: 6 Number of ZMM BROADCAST instructions: 6 | |
| ○ | [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 | 32 | |
| ○ | [SA] Too many paths (26 paths) - Simplify control structure. There are 26 issues ( = paths) costing 1 point each with a malus of 4 points. | 30 |
| ○ | [SA] Non innermost loop (Outermost) - Collapse loop with innermost ones. This issue costs 2 points. | 2 |
| ►Inefficient Vectorization | 54 | |
| ○ | [SA] Presence of expensive instructions (GATHER/SCATTER) - Use array restructuring. There are 4 issues (= instructions) costing 4 points each. | 16 |
| ► | [SA] Presence of special instructions executing on a single port (INSERT/EXTRACT, COMPRESS/EXPAND, SHUFFLE/PERM, BROADCAST) - Simplify data access and try to get stride 1 access. There are 36 issues (= instructions) costing 1 point each. | 36 |
| ○ | Number of INSERT/EXTRACT instructions: 10 Number of ZMM COMPRESS/EXPAND instructions: 2 Number of XMM SHUFFLE/PERM instructions: 7 Number of ZMM SHUFFLE/PERM instructions: 5 Number of XMM BROADCAST instructions: 6 Number of ZMM BROADCAST instructions: 6 | |
| ○ | [SA] Inefficient vectorization: use of masked instructions - Simplify control structure. The issue costs 2 points. | 2 |
| ►Loop 17552 - libgromacs_mpi.so.9.0.0 | Execution Time: 2 % - Vectorization Ratio: 79.18 % - Vector Length Use: 21.66 % | |
| ►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 | 23 | |
| ○ | [SA] Too many paths (17 paths) - Simplify control structure. There are 17 issues ( = paths) costing 1 point each with a malus of 4 points. | 21 |
| ○ | [SA] Non innermost loop (InBetween) - Collapse loop with innermost ones. This issue costs 2 points. | 2 |
| ►Data Access Issues | 22 | |
| ► | [SA] Presence of special instructions executing on a single port (INSERT/EXTRACT, BROADCAST) - Simplify data access and try to get stride 1 access. There are 20 issues (= instructions) costing 1 point each. | 20 |
| ○ | Number of INSERT/EXTRACT instructions: 2 Number of XMM BROADCAST instructions: 18 | |
| ○ | [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 | 23 | |
| ○ | [SA] Too many paths (17 paths) - Simplify control structure. There are 17 issues ( = paths) costing 1 point each with a malus of 4 points. | 21 |
| ○ | [SA] Non innermost loop (InBetween) - Collapse loop with innermost ones. This issue costs 2 points. | 2 |
| ►Inefficient Vectorization | 22 | |
| ► | [SA] Presence of special instructions executing on a single port (INSERT/EXTRACT, BROADCAST) - Simplify data access and try to get stride 1 access. There are 20 issues (= instructions) costing 1 point each. | 20 |
| ○ | Number of INSERT/EXTRACT instructions: 2 Number of XMM BROADCAST instructions: 18 | |
| ○ | [SA] Inefficient vectorization: use of masked instructions - Simplify control structure. The issue costs 2 points. | 2 |
| ►Loop 896 - libgromacs_mpi.so.9.0.0 | Execution Time: 2 % - Vectorization Ratio: 88.93 % - Vector Length Use: 85.47 % | |
| ►Loop Computation Issues | 384 | |
| ► | [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 96 issues (= instructions) costing 4 points each. | 384 |
| ○ | Number of RCP instructions: 64 Number of RSQRT instructions: 32 | |
| ►Data Access Issues | 79 | |
| ○ | [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 3 issues ( = data accesses) costing 2 point each. | 6 |
| ○ | [SA] Presence of indirect accesses - Use array restructuring or gather instructions to lower the cost. There are 4 issues ( = indirect data accesses) costing 4 point each. | 16 |
| ○ | [SA] Inefficient vectorization: more than 10% of the vector loads instructions are unaligned - When allocating arrays, don’t forget to align them. There are 9 issues ( = arrays) costing 2 points each | 18 |
| ► | [SA] Presence of special instructions executing on a single port (INSERT/EXTRACT, BROADCAST) - Simplify data access and try to get stride 1 access. There are 37 issues (= instructions) costing 1 point each. | 37 |
| ○ | Number of INSERT/EXTRACT instructions: 3 Number of ZMM BROADCAST instructions: 34 | |
| ○ | [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 | 22 | |
| ○ | [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 3 issues ( = data accesses) costing 2 point each. | 6 |
| ○ | [SA] Presence of indirect accesses - Use array restructuring or gather instructions to lower the cost. There are 4 issues ( = indirect data accesses) costing 4 point each. | 16 |
| ►Inefficient Vectorization | 39 | |
| ► | [SA] Presence of special instructions executing on a single port (INSERT/EXTRACT, BROADCAST) - Simplify data access and try to get stride 1 access. There are 37 issues (= instructions) costing 1 point each. | 37 |
| ○ | Number of INSERT/EXTRACT instructions: 3 Number of ZMM BROADCAST instructions: 34 | |
| ○ | [SA] Inefficient vectorization: use of masked instructions - Simplify control structure. The issue costs 2 points. | 2 |
| ►Loop 892 - libgromacs_mpi.so.9.0.0 | Execution Time: 1 % - Vectorization Ratio: 87.39 % - Vector Length Use: 81.79 % | |
| ►Loop Computation Issues | 256 | |
| ► | [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 64 issues (= instructions) costing 4 points each. | 256 |
| ○ | Number of RCP instructions: 32 Number of RSQRT instructions: 32 | |
| ►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 | 73 | |
| ○ | [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 4 issues ( = data accesses) costing 2 point each. | 8 |
| ○ | [SA] Presence of indirect accesses - Use array restructuring or gather instructions to lower the cost. There are 4 issues ( = indirect data accesses) costing 4 point each. | 16 |
| ○ | [SA] Inefficient vectorization: more than 10% of the vector loads instructions are unaligned - When allocating arrays, don’t forget to align them. There are 11 issues ( = arrays) costing 2 points each | 22 |
| ► | [SA] Presence of special instructions executing on a single port (INSERT/EXTRACT, BROADCAST) - Simplify data access and try to get stride 1 access. There are 25 issues (= instructions) costing 1 point each. | 25 |
| ○ | Number of INSERT/EXTRACT instructions: 3 Number of ZMM BROADCAST instructions: 22 | |
| ○ | [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 | 26 | |
| ○ | [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 4 issues ( = data accesses) costing 2 point each. | 8 |
| ○ | [SA] Presence of indirect accesses - Use array restructuring or gather instructions to lower the cost. There are 4 issues ( = indirect data accesses) costing 4 point each. | 16 |
| ►Inefficient Vectorization | 27 | |
| ► | [SA] Presence of special instructions executing on a single port (INSERT/EXTRACT, BROADCAST) - Simplify data access and try to get stride 1 access. There are 25 issues (= instructions) costing 1 point each. | 25 |
| ○ | Number of INSERT/EXTRACT instructions: 3 Number of ZMM BROADCAST instructions: 22 | |
| ○ | [SA] Inefficient vectorization: use of masked instructions - Simplify control structure. The issue costs 2 points. | 2 |
| ►Loop 17558 - libgromacs_mpi.so.9.0.0 | Execution Time: 1 % - Vectorization Ratio: 40.78 % - Vector Length Use: 17.20 % | |
| ►Control Flow Issues | 88 | |
| ○ | [SA] Too many paths (82 paths) - Simplify control structure. There are 82 issues ( = paths) costing 1 point each with a malus of 4 points. | 86 |
| ○ | [SA] Non innermost loop (InBetween) - Collapse loop with innermost ones. This issue costs 2 points. | 2 |
| ►Data Access Issues | 263 | |
| ○ | [SA] Inefficient vectorization: more than 10% of the vector loads instructions are unaligned - When allocating arrays, don’t forget to align them. There are 0 issues ( = arrays) costing 2 points each | 0 |
| ► | [SA] Presence of special instructions executing on a single port (INSERT/EXTRACT, BLEND/MERGE, SHUFFLE/PERM, BROADCAST) - Simplify data access and try to get stride 1 access. There are 263 issues (= instructions) costing 1 point each. | 263 |
| ○ | Number of INSERT/EXTRACT instructions: 66 Number of XMM BLEND/MERGE instructions: 21 Number of YMM BLEND/MERGE instructions: 18 Number of XMM SHUFFLE/PERM instructions: 64 Number of YMM SHUFFLE/PERM instructions: 32 Number of XMM BROADCAST instructions: 37 Number of YMM BROADCAST instructions: 25 | |
| ►Vectorization Roadblocks | 88 | |
| ○ | [SA] Too many paths (82 paths) - Simplify control structure. There are 82 issues ( = paths) costing 1 point each with a malus of 4 points. | 86 |
| ○ | [SA] Non innermost loop (InBetween) - Collapse loop with innermost ones. This issue costs 2 points. | 2 |
| ►Inefficient Vectorization | 263 | |
| ► | [SA] Presence of special instructions executing on a single port (INSERT/EXTRACT, BLEND/MERGE, SHUFFLE/PERM, BROADCAST) - Simplify data access and try to get stride 1 access. There are 263 issues (= instructions) costing 1 point each. | 263 |
| ○ | Number of INSERT/EXTRACT instructions: 66 Number of XMM BLEND/MERGE instructions: 21 Number of YMM BLEND/MERGE instructions: 18 Number of XMM SHUFFLE/PERM instructions: 64 Number of YMM SHUFFLE/PERM instructions: 32 Number of XMM BROADCAST instructions: 37 Number of YMM BROADCAST instructions: 25 | |
| ►Loop 17634 - libgromacs_mpi.so.9.0.0 | Execution Time: 1 % - Vectorization Ratio: 0.00 % - Vector Length Use: 7.95 % | |
| ►Data Access Issues | 12 | |
| ○ | [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 6 issues ( = data accesses) costing 2 point each. | 12 |
| ►Vectorization Roadblocks | 12 | |
| ○ | [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 6 issues ( = data accesses) costing 2 point each. | 12 |
| ►Loop 890 - libgromacs_mpi.so.9.0.0 | Execution Time: 1 % - Vectorization Ratio: 87.98 % - Vector Length Use: 82.64 % | |
| ►Loop Computation Issues | 256 | |
| ► | [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 64 issues (= instructions) costing 4 points each. | 256 |
| ○ | Number of RCP instructions: 32 Number of RSQRT instructions: 32 | |
| ►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 | 73 | |
| ○ | [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 4 issues ( = data accesses) costing 2 point each. | 8 |
| ○ | [SA] Presence of indirect accesses - Use array restructuring or gather instructions to lower the cost. There are 4 issues ( = indirect data accesses) costing 4 point each. | 16 |
| ○ | [SA] Inefficient vectorization: more than 10% of the vector loads instructions are unaligned - When allocating arrays, don’t forget to align them. There are 11 issues ( = arrays) costing 2 points each | 22 |
| ► | [SA] Presence of special instructions executing on a single port (INSERT/EXTRACT, BROADCAST) - Simplify data access and try to get stride 1 access. There are 25 issues (= instructions) costing 1 point each. | 25 |
| ○ | Number of INSERT/EXTRACT instructions: 3 Number of ZMM BROADCAST instructions: 22 | |
| ○ | [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 | 26 | |
| ○ | [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 4 issues ( = data accesses) costing 2 point each. | 8 |
| ○ | [SA] Presence of indirect accesses - Use array restructuring or gather instructions to lower the cost. There are 4 issues ( = indirect data accesses) costing 4 point each. | 16 |
| ►Inefficient Vectorization | 27 | |
| ► | [SA] Presence of special instructions executing on a single port (INSERT/EXTRACT, BROADCAST) - Simplify data access and try to get stride 1 access. There are 25 issues (= instructions) costing 1 point each. | 25 |
| ○ | Number of INSERT/EXTRACT instructions: 3 Number of ZMM BROADCAST instructions: 22 | |
| ○ | [SA] Inefficient vectorization: use of masked instructions - Simplify control structure. The issue costs 2 points. | 2 |