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V578. An odd bitwise operation detected…
Analyzer Diagnostics
General Analysis (C++)
General Analysis (C#)
General Analysis (Java)
Diagnosis of micro-optimizations (C++)
Diagnosis of 64-bit errors (Viva64, C++)
MISRA errors
AUTOSAR errors
Additional information
Contents

V578. An odd bitwise operation detected. Consider verifying it.

July 25, 2011

The analyzer detected a potential error in an expression handling bits. A part of the expression is meaningless or excessive. Usually such errors occur due to a misprint.

Consider this sample:

if (up & (PARAMETER_DPDU | PARAMETER_DPDU | PARAMETER_NG))

The PARAMETER_DPDU constant is used twice here. In a correct code there must be two different constants: PARAMETER_DPDU and PARAMETER_DPDV. The letter 'U' resembles 'V' and that is why this misprint has occurred. This is the correct code:

if (up & (PARAMETER_DPDU | PARAMETER_DPDV | PARAMETER_NG))

Another example. There is no error here but the code is excessive:

if (((pfds[i].dwFlags & pPFD->dwFlags) & pPFD->dwFlags)
    != pPFD->dwFlags)

This is a shorter code:

if ((pfds[i].dwFlags & pPFD->dwFlags) != pPFD->dwFlags)

This diagnostic also generates a warning when the label name begins with "case". A space character is most probably missing. For example, the label "case1:" should be written as "case 1:".

This diagnostic is classified as:

You can look at examples of errors detected by the V578 diagnostic.

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