Developer Guide and Reference

Contents

Disable Automatic Vectorization

The compiler finds possibilities to use SIMD (SSE/AVX) instructions to improve performance of applications. This optimization is called automatic vectorization.
In most cases, this optimization involves transformation of loops and increases code size, in some cases significantly.
Disabling this optimization may help reduce code size at the expense of performance.
Options to specify:
Linux*
and
macOS*
:
-no-vec
Windows*:
/Qvec-
Advantages of this method:
Compile-time is also improved significantly.
Disadvantages of this method:
Performance of otherwise vectorized loops may suffer significantly. If you care about the performance of your application, you should use this option selectively to suppress vectorization on everything except performance-critical parts.
Notes:
Depending on code characteristics, this option can sometimes increase binary size.

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