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V1028. Possible overflow. Consider cast…
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

V1028. Possible overflow. Consider casting operands, not the result.

Aug. 31, 2018

The analyzer has detected a suspicious type cast: the result of a binary operation over 32-bit values is cast to a 64-bit type.

Consider the following example:

unsigned a;
unsigned  b;
....
uint64_t c = (uint64_t)(a * b);

This cast is redundant: type 'unsigned' would have been automatically promoted to type 'uint64_t' anyway when executing the assignment operation.

The developer must have intended to take measures against a possible overflow but failed to do that properly. When multiplying 'unsigned' variables, the overflow will take place anyway, and only then will the meaningless product be explicitly promoted to type 'uint64_t'.

It is one of the operands that should have been cast instead to avoid the overflow. Fixed code:

uint64_t c = (uint64_t)a * b;

This diagnostic is classified as:

You can look at examples of errors detected by the V1028 diagnostic.

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