Conversion Operations (SSE2)

Microsoft Specific

Each conversion intrinsic takes one data type and performs a conversion to a different type. Some conversions such as _mm_cvtpd_ps result in a loss of precision. The rounding mode used in such cases is determined by the value in the MXCSR register. The default rounding mode is round-to-nearest. Note that the rounding mode used by the C and C++ languages when performing a type conversion is to truncate. The _mm_cvttpd_epi32, _mm_cvttsd_si32, and _mm_cvttps_epi32 intrinsics use the truncate rounding mode regardless of the mode specified by the MXCSR register.

The conversion-operation intrinsics are listed in the following table, followed by detailed descriptions.

SSE2 intrinsics use the __m128, __m128i, and __m128d data types, which are not supported on Itanium Processor Family (IPF) processors. Any SSE2 intrinsics that use the __m64 data type are not supported on x64 processors.

The emmintrin.h header file contains the declarations for the SSE2 instructions intrinsics.

Conversion Operations

For an explanation of the syntax used in code samples in this topic, see Floating-Point Intrinsics Using Streaming SIMD Extensions.

See Also

Reference

Floating-Point Intrinsics Using Streaming SIMD Extensions 2 Instructions