remark

Product Version: Intel® Fortran Compiler 15.0 and a later version 

Cause:

A vectorizable loop contains loads from memory locations that are not contiguous in memory (sometimes known as a “gather”). These may be indexed loads, as in the example below, or loads with non-unit stride. The compiler has issued a hardware gather instruction for these loads.

(Note that for compiler versions 16.0.1 and earlier, the compiler may also emit this message when gather operations are emulated in software).

 

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Product Version: Intel® Fortran Compiler 15.0 and a later version 

Cause:

A vectorizable loop contains loads from memory locations that are not contiguous in memory (sometimes known as a “gather”). These may be indexed loads, as in the example below, or loads with non-unit stride. The compiler has emulated a hardware gather instruction by issuing individual loads for the different memory locations in software.

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Product Version: Intel® Fortran Compiler 15.0 and a later version 

Cause:

The Intel® Fortran Compiler will not vectorize a loop when it knows the loop has only one iteration. If the user requires vectorization by using a SIMD directive, the compiler emits a warning diagnostic.

Example:

An example below will generate the following  remark in optimization report:

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Diagnostic 15333: simd loop was not vectorized: exception handling for a call prevents vectorization

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Diagnostic message: xxxx was not vectorized: volatile assignment was not vectorized. Try using non-volatile assignment.

Cause:

This diagnostic message is emitted when the loop in question doesn't meet the vectorization criteria in that any code involving volatile assignment within the loop prevents vectorization. In the example below the iteration control variable causes a conditional loop exit preventing vectorization.

Example:

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Diagnostic message: XXX was not vectorized: loop with early exits cannot be vectorized unless it meets search loop idiom criteria is only emitted in Intel(R) C++ Compiler 15.0 and the current 16.0 version of the product.

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Please let us know of your experience with this diagnostic message by posting a comment below. Your interest in this diagnostic will help us prioritize the order we document diagnostics.

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Thank you for your interest in this diagnostic message. We are still in the process of documenting this specific diagnostic.

Please let us know of your experience with this diagnostic message by posting a comment below. Your interest in this diagnostic will help us prioritize the order we document diagnostics.

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