This page lists some known issues and suggested workarounds for them.
We have a similar catalog of vectorization diagnostics for the Intel® Fortran Compiler
Diagnostic 15316: simd loop was not vectorized: scalar assignment in simd loop is prohibited, consider private, lastprivate or reduction clauses
Product Version: Intel® Fortran Compiler 15.0 and above
Product Version: Intel® Fortran Compiler 15.0 and a later version