Visual Studio 2008 Part 22

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181: デフォルトの名無しさん [sage] 2018/09/15(土) 14:05:09.61 ID:heijdb7v

Intel® 64 and IA-32 Architectures Software Developer’s Manual

[Vol 1]

11.6.8 Compatibility of SIMD and x87 FPU Floating-Point Data Types

SSE and SSE2 extensions operate on the same single-precision and double-precision floating-point data types that
the x87 FPU operates on. However, when operating on these data types, the SSE and SSE2 extensions operate on
them in their native format (single-precision or double-precision), in contrast to the x87 FPU which extends them
to double extended-precision floating-point format to perform computations and then rounds the result back to a
single-precision or double-precision format before writing results to memory. Because the x87 FPU operates on a
higher precision format and then rounds the result to a lower precision format, it may return a slightly different
result when performing the same operation on the same single-precision or double-precision floating-point values
than is returned by the SSE and SSE2 extensions. The difference occurs only in the least-significant bits of the
significand.

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