Steady and wonderful work!
Regards, Takenobu On Sat, Sep 26, 2020 at 6:44 PM Moritz Angermann <moritz.angerm...@gmail.com> wrote: > > Hi there! > > As some may know I've been working on a native code generation backend for > aarch64[1]. When Ben initially wrote about The state of GHC on ARM[2], I was > quite skeptical if a native code generator would really be what we should be > doing. And the claim it would take a week or two, might have been > underestimating the complexity a bit; but also the time needed to debug > crashing programs. > > The idea of a NCG however intrigued me. I did work on an alternative llvm > backend once, so I did know a bit about the code gen backend. I also knew a > bit about aarch64 assembly from working on the rts linker for aarch64. > > So here we are today, with an aarch64 ncg for ghc[3], that has some basic > optimizations included, but does not beat the llvm codegen yet in runtime > performance. It is however substantially faster than the llvm codegen for > compile time performance. > > I have performed nofib benchmarks for: > - full llvm build vs full native build[4] > - llvm nofib, with native libraries, vs full native build[5] > to discriminate effects of compiling just the nofib programs vs. the impact > the libraries have. > > I've only had time to take a cursory look over the generated assembly for the > CSD test, and the llvm codegen seems to be able to produce quite different > assembly, thus there seem to be some good optimizations llvm manages to > exploit. I'll have to investigate this closer and probably look at the llvm > IR we generate and the intermediate optimization steps llvm manages to apply > to it, as the llvm assembly doesn't ressemble the ncg assembly much. > > I plan to look at aarch64/mach-o and performance over the coming weeks. > > I hope we can get this in for 9.2. > > Cheers, > Moritz > > -- > [1]: https://gitlab.haskell.org/ghc/ghc/-/merge_requests/3641 > [2]: https://www.haskell.org/ghc/blog/20200515-ghc-on-arm.html > [3]: https://gitlab.haskell.org/ghc/ghc/-/merge_requests/3641 > [4]: https://gist.github.com/9d93454b832b769b5bdb4e731a10c068 > [5]: https://gist.github.com/acc4dab7836f1f509716ac398a94d949 > _______________________________________________ > ghc-devs mailing list > ghc-devs@haskell.org > http://mail.haskell.org/cgi-bin/mailman/listinfo/ghc-devs _______________________________________________ ghc-devs mailing list ghc-devs@haskell.org http://mail.haskell.org/cgi-bin/mailman/listinfo/ghc-devs
