LLVM Clang 16 vs. GCC 13 Compiler Performance On Intel Raptor Lake

[brad0]

Does clang compile kernel yet? If not it can lick GCC boots.

It does and with LTO. GCC is the one licking Clang's boots.

[Weasel]

TBH this whole ELF interposition should've never been the default but an explicit opt-in. Its not used anywhere outside of hooking stuff into libc

It's due to ELF's garbage global symbols. PE in contrast can't even store them. You can still hook there, it just requires more effort, and who cares? Most people who hook are experienced enough for it to not matter, unlike 99.999% of users who will suffer because of ELF's stupid design decisions.

[berolinux]

Looks like OpenMandriva's idea of switching the entire OS to building with clang will finally pay off in terms of performance.

[brad0]

Looks like OpenMandriva's idea of switching the entire OS to building with clang will finally pay off in terms of performance.

It already has for some time.

[DanglingPointer]

When are we getting this... ???
11.4 vs 12.2 vs 12.3 vs 13.1 vs llvm-15 vs llvm-16
with:

• O2
• O3
• O2 -flto
• O3 -flto
• O3 -flto=thin (llvm)
• march=native O2
• march=native O3
• march=native O2 -flto
• march=native O3 -flto
• march=native O3 -flto=thin (llvm)

with AMD

[akostadinov]

Wanted to see what compiles faster, ont the resulting binaries...