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V810. Decreased performance. The 'A' fu…
Analyzer diagnostics
General Analysis (C++)
General Analysis (C#)
General Analysis (Java)
Diagnosis of micro-optimizations (C++)
Diagnosis of 64-bit errors (Viva64, C++)
Customer specific requests (C++)
MISRA errors
AUTOSAR errors
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V810. Decreased performance. The 'A' function was called several times with identical arguments. The result should possibly be saved to a temporary variable, which then could be used while calling the 'B' function.

Jan 22 2013

The analyzer has found some code that can be optimized. The code contains a call of a function which accepts as its arguments several calls of one and the same function with identical arguments.

Consider the following sample:

....
init(cos(-roty), sin(-roty),
     -sin(-roty), cos(-roty));
....

The call of such a function works slowly, while this effect will be intensified if this code fragment is placed inside a loop. You'd better rewrite this code. For instance, you may create a temporary variable:

....
double cos_r = cos(-roty);
double sin_r = sin(-roty);
init(cos_r, sin_r, -sin_r, cos_r);
....

You cannot always change the code that way, of course. Moreover, this refactoring doesn't always guarantee that you get a performance gain. But such optimizations may be very helpful sometimes.

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