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killer
2018 Dec 03
3
The builtins library of compiler-rt is a performance HOG^WKILLER
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!
The reasons: 1.
2018 Dec 03
3
The builtins library of compiler-rt is a performance HOG^WKILLER
"Craig Topper" <craig.topper at gmail.com> wrote:
> None of the "si" division routines will be used by x86.
That was my expectation too.
> They exist for targets that don't support the operations natively.
> X86 supports them natively so will never use the library functions.
So they SHOULD not be built (or at least not shipped) with the
builtins library