Important This document may not represent best practices for current development, links to downloads and other resources may no longer be valid. Current recommended version can be found here. ArchiveDisclaimer


Marks the function as significant to the 64-bit common language runtime. This is used on certain functions in Microsoft-provided libraries.


jitintrinsic adds a MODOPT (IsJitIntrinsic) to a function signature.

Users are discouraged from using this __declspec modifier, as unexpected results can occur.

© 2015 Microsoft