Re: [boost] [GSoC] SIMD proposal

On 24/03/2011 19:21, Gruenke, Matt wrote:

MSVC defines _M_IX86_FP, to indicate whether /arch was specified, and whether for SSE or SSE2. Unfortunately, it does not (currently) go beyond SSE2.

Source: http://msdn.microsoft.com/en-us/library/b0084kay.aspx<http://msdn.microsoft.com/en-us/library/b0084kay.aspx>

One possibility would be to require the user to manually define a macro, when using such compilers.

Matt

Which I already said. It is also completely orthogonal; /arch is more like an equivalent of the -mfpmath GCC option. It does not control availability of instructions, but rather what instructions are generated for the floating point operations (as the name _M_IX86_FP clearly reflects)