Stream: git-wasmtime

Topic: wasmtime / Issue #2299 Cranelift: Support stack probes wi...

view this post on Zulip Wasmtime GitHub notifications bot (Oct 18 2020 at 14:16):

bjorn3 opened Issue #2299:

<!-- Please try to describe precisely what you would like to do in
Cranelift/Wasmtime and/or expect from it. You can answer the questions below if
they're relevant and delete this text before submitting. Thanks for opening an
issue! -->

Feature

LLVM has support for performing the stack probes directly in the function prologue instead of calling an external function. (see https://github.com/rust-lang/rust/pull/77885 for using this in Rust)

Benefit

This can be faster due to being able to unroll the stack probe loop. It also avoids having to provide an external stack probe function. This makes it possible to enable stack probing in cg_clif. (https://github.com/bjorn3/rustc_codegen_cranelift/issues/661)

Implementation

This should only be implemented for the machinst backends. It should probably be added to either the gen_prologue implementation or gen_prologue caller.

Alternatives

Keep using an external stack probe function with the associated drawbacks.

Last updated: Dec 23 2024 at 12:05 UTC