Developer Guide and Reference

Contents

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.
Many routines in the LIBIRC library are more highly optimized for Intel® microprocessors than for non-Intel microprocessors.
Alternate Options
None

Product and Performance Information

1

Intel's compilers may or may not optimize to the same degree for non-Intel microprocessors for optimizations that are not unique to Intel microprocessors. These optimizations include SSE2, SSE3, and SSSE3 instruction sets and other optimizations. Intel does not guarantee the availability, functionality, or effectiveness of any optimization on microprocessors not manufactured by Intel. Microprocessor-dependent optimizations in this product are intended for use with Intel microprocessors. Certain optimizations not specific to Intel microarchitecture are reserved for Intel microprocessors. Please refer to the applicable product User and Reference Guides for more information regarding the specific instruction sets covered by this notice.

Notice revision #20110804