# qopt-calloc

Tells the compiler to substitute a call to _intel_fast_calloc() for a call to calloc().

## Syntax

Linux: | -qopt-calloc -qno-opt-calloc

macOS: | None

Windows: | None

## Arguments

None

## Default

-qno-opt-calloc | The compiler does not substitute a call to _intel_fast_calloc() for a call to calloc().

## Description

This option tells the compiler to substitute a call to_intel_fast_calloc() for a call to calloc().

This option may increase the performance of long-running programs that use calloc() frequently. It is recommended for these programs over combinations of options -inline-calloc and -qopt-malloc-options=3 because this option causes less memory fragmentation.

### Note

Many routines in the LIBIRC library are more highly optimized for Intel® microprocessors than for non-Intel microprocessors.

## IDE Equivalent

None

## Alternate Options

None

Parent topic: Advanced Optimization Options