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SSE2
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==Compiler usage== When introduced in 2000, SSE2 was not supported by software development tools. For example, to use SSE2 in a [[Microsoft Visual Studio]] project, the programmer had to either manually write inline-assembly or import object-code from an external source. Later the Visual C++ Processor Pack added SSE2 support to [[Visual C++]] and [[MASM]]. The [[Intel C++ Compiler]] can automatically generate [[SSE4]], [[SSSE3]], [[SSE3]], SSE2, and SSE code without the use of hand-coded assembly. Since GCC 3, [[GNU Compiler Collection|GCC]] can automatically generate SSE/SSE2 scalar code when the target supports those instructions. [[Automatic vectorization]] for SSE/SSE2 has been added since GCC 4. The [[Sun Studio Compiler Suite]] can also generate SSE2 instructions when the compiler flag -xvector=simd is used. Since [[Microsoft Visual C++]] 2012, the compiler option to generate SSE2 instructions is turned on by default.
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