[llvm-bugs] [Bug 51480] clang-cl doesn't correctly map /arch:XXX options to corresponding features

via llvm-bugs llvm-bugs at lists.llvm.org
Mon Aug 16 10:15:01 PDT 2021


Reid Kleckner <rnk at google.com> changed:

           What    |Removed                     |Added
             Status|NEW                         |RESOLVED
         Resolution|---                         |WONTFIX

--- Comment #1 from Reid Kleckner <rnk at google.com> ---
MSVC has a different model for intrinsics: they can always be called regardless
of the /arch: setting. Clang requires you to enable the relevant features.
There are no plans to implement the MSVC intrinsic model. LLVM subtarget
features are set at the function level. You can control them either with
__attribute__((target)) or the various -m* flags. There is no /arch: flag for
SSSE3, so your workaround is a proper solution.

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