Stream: git-wasmtime

Topic: wasmtime / PR #14094 perf: cranelift-srcgen: optimize For...

Wasmtime GitHub notifications bot (Aug 08 2026 at 17:56):

dishmaker opened PR #14094 from dishmaker:dishmaker/perf_cc_formatter_buf to bytecodealliance:main:

This reduces run-time of cranelift-codegen (build-script) (run) by changing:

• lines: Vec<String> to
• lines: String.

Depends on #14092

Wasmtime GitHub notifications bot (Aug 08 2026 at 18:17):

dishmaker updated PR #14094.

Wasmtime GitHub notifications bot (Aug 08 2026 at 19:50):

github-actions[bot] added the label cranelift on PR #14094.

Wasmtime GitHub notifications bot (Aug 08 2026 at 19:50):

github-actions[bot] added the label cranelift:meta on PR #14094.

Wasmtime GitHub notifications bot (Aug 09 2026 at 17:27):

dishmaker edited PR #14094:

This reduces run-time of cranelift-codegen (build-script) (run) by changing:

• lines: Vec<String> to
• lines: String

so that

file.write_all(self.lines.as_bytes())?;

is called once.

Depends on #14092

Wasmtime GitHub notifications bot (Aug 11 2026 at 20:42):

dishmaker updated PR #14094.

Wasmtime GitHub notifications bot (Aug 11 2026 at 20:43):

dishmaker edited PR #14094:

This reduces run-time of cranelift-codegen (build-script) (run):

• -0.4% on debug
• -3.1% on release [^1]

by changing:

• lines: Vec<String> to
• lines: String

so that

file.write_all(self.lines.as_bytes())?;

is called once.

Depends on #14092

[^1]: build script won't be in opt-release mode, because of [profile.release.build-override] opt-level = 0
https://github.com/bytecodealliance/wasmtime/blob/a48196189a5e3b5e5f288f776062fb6e7189e43f/Cargo.toml#L177-L178

Wasmtime GitHub notifications bot (Aug 11 2026 at 20:44):

dishmaker has marked PR #14094 as ready for review.

Wasmtime GitHub notifications bot (Aug 11 2026 at 20:44):

dishmaker requested wasmtime-compiler-reviewers for a review on PR #14094.

Wasmtime GitHub notifications bot (Aug 11 2026 at 20:44):

dishmaker requested fitzgen for a review on PR #14094.

Wasmtime GitHub notifications bot (Aug 12 2026 at 18:30):

:thumbs_up: fitzgen submitted PR review:

Thanks!

Wasmtime GitHub notifications bot (Aug 12 2026 at 18:30):

fitzgen added PR #14094 perf: cranelift-srcgen: optimize Formatter buffering to the merge queue.

Wasmtime GitHub notifications bot (Aug 12 2026 at 19:01):

:check: fitzgen merged PR #14094.

Wasmtime GitHub notifications bot (Aug 12 2026 at 19:01):

fitzgen removed PR #14094 perf: cranelift-srcgen: optimize Formatter buffering from the merge queue.

Last updated: Aug 30 2026 at 09:07 UTC