This section describes the C/C++ language-level features supporting SSE. The following features of the intrinsics are explained:

• Streaming SIMD Extensions Supported by 3DNow!

• Floating-Point Intrinsics Using Streaming SIMD Extensions

• Miscellaneous Intrinsics Using Streaming SIMD Extensions

• Memory and Initialization Using Streaming SIMD Extensions

• Integer Intrinsics Using Streaming SIMD Extensions

• Cache Support Using Streaming SIMD Extensions

In addition, the following macro functions are described:

• Macro Function for Shuffle Using Streaming SIMD Extensions

• Macro Functions to Read and Write the Control Registers

• Macro Function for Matrix Transposition

The header file xmmintrin.h contains the declarations for the SSE intrinsics. The file fvec.h contains operator overloads for some of the SSE intrinsics, which are available for use in C++ programs.

SSE intrinsics use the __m128, __m128i, and __m128d data types, which are not supported on Itanium Processor Family (IPF) processors. Any SSE intrinsics that use the __m64 data type are not supported on x64 processors.

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