On 21/11/2020 14:15, Florian Klämpfl via fpc-pascal wrote: > Am 21.11.2020 um 12:54 schrieb Tobias Giesen via fpc-pascal: >> >> According to Geekbench, the single core performance on the new Mac is >> around 1.8x as fast as my Intel Mac. Multicore is also much faster. I >> wonder why I don't see the speed increase in compiling though. Yes I am >> using different FPC and XCode versions, but I wonder what else could >> have an influence? My project is very large and not divided into >> packages, so I frequently need to recompile the whole project. > > Large parts of FPC are memory throughput limited so I suspect the M1 is > not that much better in this regard, not to mention that most likely the > AAarch code generator is worse than the x86 one. x86 received a lot of > work in this field. > > Maybe it's possible that you build using an LLVM compiler the FPC with > native backend. As I do not use macOS, I have no clue how to do this > though.
For compiling the compiler itself, excluding assembling and linking, a compiler compiled using the LLVM backend (but that generates code using our native code generator (*) ) is 18.85% faster than one compiled using our native code generator (on a Developer Transition Kit, but I guess it will be similar on the M1). If you include assembling and linking (which you obviously always have to do), the speed difference shrinks to 8.5%. So more time is spent in the assembler (clang) and ld than in the compiler. As to how to do build a compiler on macOS that uses the LLVM backend, that's the same as on Linux, except that you don't need special command line options to find libgcc: https://wiki.freepascal.org/LLVM Jonas (*) using the LLVM backend is slower because clang's code generator is much slower than FPC's. _______________________________________________ fpc-pascal maillist - fpc-pascal@lists.freepascal.org https://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-pascal