antinucleon commented on pull request #7022:
URL: https://github.com/apache/tvm/pull/7022#issuecomment-737778535
> > @FrozenGene I tried it is tricky lol. I need to cross compile an ARM 64
LLVM. I did once but seems it was still x86-64 binary, then it will cause ARM
conda segfault. If I don't work with conda, the tricky part is scipy, which
requires gcc. I probably need to cross compile an ARM gcc, then compile LAPACK
+ Scipy. Or I can eliminate scipy dependency in TVM (which I have done in one
version)
> > Last time I don't have enough time to figure out how to correctly cross
compile ARM64 LLVM, maybe I can try again this week.
> > A few tips for people who want to compile LLVM on MacMini directly:
> >
> > * Use make -j2 at beginning
> > * When make is killed because of OOM, reboot
> > * Use make -j2 again it will be successful :D
>
> When you build it on the Apple Silicon machine, LLVM can not recognize
correct host target and still produce x86 binary?
I need to double-check. I was hit by segfault but didn't dive into it.
For the GCC part, could we build LLVM with Clang together then make a
softlink gcc pointing to clang like Apple doing it on Mac?
There is a gcc port, which conda is using. Which we may use.
My guess is: we don't know whether M1 is using some new vector / FMA
instruction. If so, we can only obtain good perf until Apple contributes back
to upstream LLVM. But I hope we will have more sense this week.
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