Intel® Fortran Compiler 17.0 Developer Guide and Reference
Enables or disables dynamic data alignment optimizations. Option -qopt-dynamic-align is the replacement option for -opt-dynamic-align, which is deprecated.
Linux and macOS: | -qopt-dynamic-align -qno-opt-dynamic-align |
Windows: | /Qopt-dynamic-align /Qopt-dynamic-align- |
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-qopt-dynamic-align |
The compiler may generate code dynamically dependent on alignment. It may do optimizations based on data location for the best performance. The result of execution on some algorithms may depend on data layout. |
This option enables or disables dynamic data alignment optimizations.
If you specify -qno-opt-dynamic-align or /Qopt-dynamic-align-, the compiler generates no code dynamically dependent on alignment. It will not do any optimizations based on data location and results will depend on the data values themselves.
When you specify [q or Q]qopt-dynamic-align, the compiler may implement conditional optimizations based on dynamic alignment of the input data. These dynamic alignment optimizations may result in different bitwise results for aligned and unaligned data with the same values.
Dynamic alignment optimizations can improve the performance of vectorized code, especially for long trip count loops. Disabling such optimizations can decrease performance, but it may improve bitwise reproducibility of results, factoring out data location from possible sources of discrepancy.
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