Intel® oneAPI DPC++/C++ Compiler Developer Guide and Reference

ID 767253
Date 3/22/2024
Public

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Document Table of Contents

Integer Vector Classes

The Ivec classes provide an interface to single instruction, multiple data (SIMD) processing using integer vectors of various sizes. The class hierarchy is represented in the following figure.

Ivec Class Hierarchy



The M64 and M128 classes define the __m64 and __m128i data types from which the rest of the Ivec classes are derived. The first generation of child classes (the intermediate classes) are derived on element sizes of 128, 64, 32, 16, and 8 bits:

I128vec1, I64vec1, I64vec2, I32vec2, I32vec4, I16vec4, I16vec8, I8vec8, I8vec16

The second generation specify the signedness:

Is64vec2, Iu64vec2, Is32vec2, Iu32vec2, Is32vec4, Iu32vec4, Is16vec4, Iu16vec4, Is16vec8, Iu16vec8, Is8vec8, Iu8vec8, Is8vec16, Iu8vec16

CAUTION:

Intermixing the M64 and M128 data types will result in unexpected behavior.