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Diagnostic 15143: loop was not vectorized: loop was transformed to memset or memcpy

Cause: 

When a code contains a loop or array syntax performing a simple initialization or a copy, the compiler may replace the loop with a function call to either set memory (memset) or copy memory (memcpy).  It is usually more efficient to replace these simple operations with a memset or memcpy function call. This diagnostic informs us when the compiler has chosen to call a function to replace the loop or array syntax. 

Example:

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  • Diagnostic 15023: loop was not vectorized: unsupported loop structure

    Cause:

    This vectorization message is emitted when there are multiple exit points from a given loop.  Below is an example for this scenario. Here the DO loop has a conditional in which it's possible to exit the loop early if the condition is met.  Because of this exit this loop is not a vectorization candidate.

    Example:

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  • Diagnostic 15042: pragma supersedes previous setting

    Cause:

    This diagnostics message comes when the parameters of the directive are contradictory.  

    In the example below, the directive !dir$ loop count has two clauses, avg() and max(). Notice the contradiction in these two clauses: the max() parameter is lesser than the avg() clause value:


    Examples:

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