Developer Guide and Reference

Contents

unroll
, Qunroll

Tells the compiler the maximum number of times to unroll loops.

Syntax

Linux:
-unroll
[
=
n
]
macOS:
-unroll
[
=
n
]
Windows:
/Qunroll
[
:
n
]
Arguments
n
Is the maximum number of times a loop can be unrolled. To disable loop enrolling, specify 0.
Default
-unroll
or
/Qunroll
The compiler uses default heuristics when unrolling loops.
Description
This option tells the compiler the maximum number of times to unroll loops.
If you do not specify
n
, the optimizer determines how many times loops can be unrolled.
Alternate Options
Linux
and
macOS*
:
-funroll-loops
Windows: 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