Where does _X86_ get defined?

Where does _X86_ get defined?

I have a VS solution with both WIN32 and X64 projects. I've used !DEC$ IF DEFINED(_X86_) in a bunch of places to make the 32 bit version syntax different. But Now I find my WIN32 project is being compiled thinking that _X86_ isn't defined. Is this automatically set somewhere? I thought it was being done correctly, and now it isn't.

Thanks!

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For more complete information about compiler optimizations, see our Optimization Notice.

That's not one of the compiler's predefined symbols. It does define _M_X86 when compiling for X86.

Steve - Intel Developer Support

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