29 lines
1 KiB
ReStructuredText
29 lines
1 KiB
ReStructuredText
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.. title:: clang-tidy - altera-id-dependent-backward-branch
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altera-id-dependent-backward-branch
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===================================
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Finds ID-dependent variables and fields that are used within loops. This causes
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branches to occur inside the loops, and thus leads to performance degradation.
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.. code-block:: c++
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// The following code will produce a warning because this ID-dependent
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// variable is used in a loop condition statement.
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int ThreadID = get_local_id(0);
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// The following loop will produce a warning because the loop condition
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// statement depends on an ID-dependent variable.
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for (int i = 0; i < ThreadID; ++i) {
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std::cout << i << std::endl;
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}
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// The following loop will not produce a warning, because the ID-dependent
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// variable is not used in the loop condition statement.
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for (int i = 0; i < 100; ++i) {
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std::cout << ThreadID << std::endl;
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}
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Based on the `Altera SDK for OpenCL: Best Practices Guide
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<https://www.altera.com/en_US/pdfs/literature/hb/opencl-sdk/aocl_optimization_guide.pdf>`_.
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