Thanks Thomas - haven't run into any issues. There wasn't any measurable performance uplift when using -mtail-call though, which is probably because my workload (FFmpeg) may not use it much.
That being said, I previously played around with the -menable-tail-call linker flag. And unlike -mtail-call, it does two things: firstly, it does produce a small (~1%), but consistent performance uplift. At the same time, it doesn't seem to make use of the new WebAssembly opcodes (didn't require me to enable those in V8). Not sure what -menable-tail-call actually does, but it seems different from -mtail-call. Also, it cannot be used as a compiler flag, ie. only the linker will accept it. Any ideas? Soeren On Wednesday, November 24, 2021 at 10:57:46 AM UTC+10 [email protected] wrote: > Hi Soeren, > > The compiler flag -mtail-call is what you want. This support has been in > upstream LLVM for a while, but it hasn't been used very much, so if you run > into bugs with it, please let us know! > > Best, > > Thomas > > On Tue, Nov 23, 2021 at 6:14 PM Soeren Balko <[email protected]> wrote: > >> I was wondering about the state of WebAssembly tail call support in >> Emscripten. It's available as an experimental V8 feature in Chrome and will >> hopefully be mainstreamed in the not-too distant future. >> >> Couldn't find much information on how to build with tail call support in >> Emscripten, but I suspect that adding the -menable-tail-call linker flag >> does the trick? Or is there more to it? >> >> @Alon - can you please confirm? >> >> Thank you! >> Soeren >> >> -- >> You received this message because you are subscribed to the Google Groups >> "emscripten-discuss" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected]. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/emscripten-discuss/bdcc8072-b7a0-454c-bd05-68b0ae780c77n%40googlegroups.com >> >> <https://groups.google.com/d/msgid/emscripten-discuss/bdcc8072-b7a0-454c-bd05-68b0ae780c77n%40googlegroups.com?utm_medium=email&utm_source=footer> >> . >> > -- You received this message because you are subscribed to the Google Groups "emscripten-discuss" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/emscripten-discuss/f697836d-10ef-41a0-85bb-565698302427n%40googlegroups.com.
