Typical Advice

 advice #30004: Loop at line 257 cannot be scheduled efficiently, as it
contains a switch statement. Try to rewrite loop.

Why is the Compiler giving this Advice ?

There is a switch statement within a loop. This will prevent the software-pipelining loop optimization, which is critical for generating efficiient loops.

What it means:

A switch statement in a loop will disqualify the loop for software pipelining. Software-pipelining is a key optimization; you may see reduced performance without software pipelining.

Risks, Severity

If this condition occurs, the compiler cannot perform the software pipelining loop optimization, which is crucial to getting good performance.

Suggested Action

Rewrite loop without a switch statement.

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