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Hello. Excuse me. Why CMakeLists.txt from llvm-3.9.1.src does not contain WebAssembly target? So, it is like set(LLVM_ALL_TARGETS AArch64 AMDGPU ARM BPF Hexagon Mips MSP430 NVPTX PowerPC Sparc SystemZ X86 XCore ) but not like set(LLVM_ALL_TARGETS AArch64 AMDGPU ARM BPF Hexagon Mips MSP430 NVPTX PowerPC Sparc SystemZ Webasse...

Okay, so where should I send questions for WebAssembly? Is it this mailing list or a different one? I want to ask about how to compile WebAssembly modules with Clang directly, without Emscripten, for situations like what I have currently where I have a problem with generating WebAssembly and/or JavaScript glue code (I have a problem with the gen_stru...

Hello all, WebAssembly [0] its a new virtual ISA being designed to efficiently run compiled code in web browsers and other things, starting with C/C++, and eventually many other languages [1]. WebAssembly distinguishes itself from other virtual ISAs with optimizations to reduce download size and decode time, strong porta...

...h I wouldn’t bother > adding the support for implicit virtual definition. > > I don’t think we need a bit to allow if we go that direction. > > On Nov 19, 2019, at 10:29 AM, Thomas Lively <tlively at google.com> wrote: > > To get into more detail, I'm trying to update WebAssembly's `call` > instruction. `call` is currently constrained to return one or zero > arguments, so in TableGen we have a separate call Instruction for each > possible return type. But I need to update calls to return arbitrarily many > values of any combination of WebAssembly types, so e...

Hi llvm-dev, I recently updated the WebAssembly TargetTransformInfo to allow functions with different target feature sets to be inlined into each other, but I ran into an issue I want to get the community's opinion on. Since WebAssembly modules have to be validated before they are run, it only makes sense to talk about WebAssembly features...

To get into more detail, I'm trying to update WebAssembly's `call` instruction. `call` is currently constrained to return one or zero arguments, so in TableGen we have a separate call Instruction for each possible return type. But I need to update calls to return arbitrarily many values of any combination of WebAssembly types, so even if we imposed so...

...teresting, I have a few questions: > > > Has the ISA been finalized yet or is it still a work in progress? Will > there be a fixed number of registers? > The design document has a high-level idea of the ISA, or rather of the AST we're thinking of going with: https://github.com/WebAssembly/design/blob/master/AstSemantics.md The final encoding isn't decided on, we're still missing experiments to figure out precise details. We foresee having an infinite number of locals per function, but we plan to pre-color them so that locals whose lifetimes don't interfere can be merge...

Fixing llvm-dev at llvm.org to llvm-dev at lists.llvm.org On Tue, Nov 17, 2020 at 11:27 AM Thomas Lively <tlively at google.com> wrote: > Thanks for your work on this, Paulo! > > Here's some more detail about how function pointers work today in the > WebAssembly backend and how they differ from the `funcref` Paulo is > working on. > > Today in the WebAssembly backend, both function and data pointers are > emitted as > WebAssembly `i32` values. Data pointers are indices into the WebAssembly > linear > memory and function pointers are in...

Dan Gohman <sunfish at mozilla.com> writes: >> Sorry, I meant why that didn't work with ELF (or what else didn't). >> > > The standard executable WebAssembly format does not use ELF, for numerous > reasons, most visibly that ELF is designed for sparse decoding -- headers > contain offsets to arbitrary points in the file, while WebAssembly's format > is designed for streaming decoding. Also, as Sam mentioned, there are a lot > of conceptu...

...> BTW, is that summarized somewhere? >> >> I remember the discussion about having relocations that would resolve to >> function numbers, but I don't remember where that failed. >> > > Looking at Sam's patch, it seems like that's what it does, e.g. > R_WEBASSEMBLY_FUNCTION_INDEX_LEB Sorry, I meant why that didn't work with ELF (or what else didn't). Cheers, Rafael

Hi Quentin, Thanks, that explanation makes sense. I can see that in a normal register machine, implicitly defs must be physical registers. In a stack machine like WebAssembly, though, implicit defs are known to be pushed onto the value stack just like any other defs. Slots on the value stack are represented by virtual registers until stackification, so for WebAssembly we do need the implicit defs to be stored in virtual registers. I guess the best thing to do for now wo...

David, That's right, WebAssembly does not have a way to conditionally use a feature or even do runtime feature testing right now. It's on our roadmap of things to design and standardize, but it is still a long way off. > Another direction would be to require the features to be specified consistently for all components of t...

Hi All, WebAssembly has been around for a while now, it's still being actively worked on and used. I think it's long past time we make it a normal target so that it gets tested on a regular basis. (Most recent random breakage is https://reviews.llvm.org/rL342576 which fails make check with web assembly enabled...

If anyone is integrating Opus audio into a web or JavaScript application, I wrote a WebAssembly Opus decoder that uses libopusfile to decode Opus files in chunks using the JavaScript Streams API. This decoder can begin decoding after receiving the Opus headers and first audio data page: https://github.com/AnthumChris/opus-stream-decoder All thoughts and contributions are welcome, and I'...

Hi all, Virtual ISAs such as WebAssembly and NVPTX use infinite virtual register sets instead of traditional phsyical registers. PrologEpilogInserter is run after register allocation and asserts that all virtuals have been allocated but doesn't otherwise depend on this if scavenging is not needed. We'd like to use the target-indep...

Has anyone attempted to compile R (probably without any OS bindings) to WebAssembly / Emscripten? If so, how far did you get? (would be crazy awesome if you could get all the way to a ggplot bitmap output). If not, is this a waste of time or is there some daylight to doing this? [[alternative HTML version deleted]]

Apologies if there is a better forum for these questions. Please redirect me if so. I’ve been using the clang/wasm-ld tools to experiment with some basic examples, and there’s a couple things I’m wrestling with. 1) How to denote a function as the “start” function (https://webassembly.github.io/spec/core/binary/modules.html#start-section) 2) How to avoid the defaulted __heap_base global. I’ve dug around on the samples, mailing lists, and in the wasm-ld code for an attribute or flag to specify the start function, but don’t see anything. Is this just not implemented (or tracked)...

On Mon, Jul 10, 2017 at 4:13 PM, Rui Ueyama via llvm-dev <llvm-dev at lists.llvm.org> wrote: > Sorry for the belated response. I was on vacation last week. A couple of > thoughts on this patch and the story of webassembly linking. And I'm about to be on (mostly) vacation for next 3 weeks :) > > - This patch adds a wasm support as yet another major architecture besides > ELF and COFF. That is fine and actually aligned to the design principle of > the current lld. Wasm is probably more different than...

...hy this assumption is made or what code depends on it, but it is over 12 years old: https://github.com/llvm/llvm-project/commit/c5549fc3a055710a3958a5b3164db3fa167c720c#diff-9dfdb934cb2b01ba001da4bbf3c5cb3cR632 . The context for this question is that I am trying to implement an instruction for the WebAssembly backend that returns a variable number of operands. I am following the example of ARM's load multiple instructions, but this assertion in the instruction emitter is causing problems because WebAssembly, unlike ARM, does not use physical registers at all. Also, almost all WebAssembly instruction...

Thanks Timothy. Media Source Extensions were much easier and high-level than using WebAssembly with the Web Audio API. Unfortunately, MSE does not support MIME "audio/ogg" and I had to put my OpusFiles into a WebM container file. What could we do to get MSE support for Ogg Opus files? I created this issue if it helps: https://github.com/w3c/media-source/issues/245. Would be hap...