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On Mon, Dec 3, 2018 at 2:51 PM Stefan Kanthak via llvm-dev <llvm-dev@lists.llvm.org> wrote:

Hi @ll,

LLVM-7.0.0-win32.exe contains and installs
lib\\clang\\7.0.0\\lib\\windows\\clang\_rt.builtins-i386.lib

The implementation of (at least) the multiplication and division
routines \_\_\[u\]{div,mod,divmod,mul}\[sdt\]i\[34\] shipped with this
libraries SUCKS: they are factors SLOWER than even Microsoft's
NOTORIOUS POOR implementation of 64-bit division shipped with
MSVC and Windows!

I'm really happy that you're looking at making some of these routines better (and Craig and others have given excellent suggestions about how to go about this.

But in the future, please be more polite and respectful on the LLVM mailing lists. Insults, all-capital-letters, and inflammatory language are unnecessary and unhelpful in our community. You can tell us that "the performance is really bad" and we'll actually take that more seriously than the phrasing you've used in this email.

Anyways, also looking forward to the improvements to this area.

-Chandler