[Bug c++/83018] New: To support creation of header-only C++ libraries with SIMD optimization and dynamic dispatch, allow all intrinsics regardless of target architecture

[kerukuro at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83018

            Bug ID: 83018
           Summary: To support creation of header-only C++ libraries with
                    SIMD optimization and dynamic dispatch, allow all
                    intrinsics regardless of target architecture
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: kerukuro at gmail dot com
  Target Milestone: ---

Visual C++ already does this. Using Visual C++, I can use e.g. AVX2 intrinsics
in a program compiled with SSE2 target architecture and dispatch to that code
path dynamically if CPU supports AVX2. GCC requires compiling separate object
files to achieve that, which is not possible for header-only libraries.