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V819. Decreased performance. Memory is …
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

V819. Decreased performance. Memory is allocated and released multiple times inside the loop body.

Jun 07 2017

The analyzer has detected a construct that could be optimized. A memory block of the same size is allocated and released multiple times inside a loop body. To increase the program's performance, take the code performing memory allocation and release out of the loop into a separate code block.

Consider the following example:

for (int i = 0; i < N; i++)
{
  int *arr = new int[1024 * 1024];
  SetValues(arr);
  val[i] = GetP(arr);
  delete [] arr;
}

Memory allocation and release can be taken out of the loop and implemented as a separate code block.

Improved code:

int *arr = new int[1024 * 1024];
for (int i = 0; i < N; i++)
{
  SetValues(arr);
  val[i] = GetP(arr);
}
delete [] arr;

Similarly, the analyzer may suggest optimizing code where memory is allocated using function 'malloc' and the like.

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