Cranelift based backend for rustc
C-Rank Grade: D (Risky) - 12/100
External PR Merge Rate: -
Response Time: -
First Timer Success: -
rust-lang/rustc_codegen_cranelift has a recorded first-timer success rate of 0.0%. Repositories ranked D typically provide actionable feedback during code reviews and actively nurture new community contributors.
Maintainers in rust-lang/rustc_codegen_cranelift respond to incoming external pull requests in approximately 0.0 hours on average. Keeping PRs focused on single tasks and ensuring tests pass helps maintainers review faster.
The C-Rank™ system evaluates GitHub projects on a 0–100 scale using real data: PR merge rates, review turnaround time, active maintainer presence, and first-time contributor success. A score of 12.0 places rust-lang/rustc_codegen_cranelift in the D tier.
The external contributor pull request merge rate for rust-lang/rustc_codegen_cranelift is 0.0%, based on public PR activity from non-core contributors.
rust-lang/rustc_codegen_cranelift currently has 1 active issue(s) tagged with beginner-friendly labels like "good first issue", "beginner", or "up-for-grabs".
Collaborative maintainer environment in rust-lang/rustc_codegen_cranelift. Reviews community pull requests with focus on project quality.
Discussions in rust-lang/rustc_codegen_cranelift focus heavily on practical implementation feedback, code formatting standards, and issue reproduction details.
Unlinked PRs without issue context and changes that fail automated test suites face the highest review friction.
Average Response Latency
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External Acceptance Rate
Percentage of community pull requests successfully merged into main.
First PR Conversion
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Show contributors that your repository actively reviews and merges external pull requests.
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Historical health & responsiveness evolution
External PR acceptance
First PR success rate
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Maintainer review activity heatmap & prime window prediction
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Maintainers are most responsive around 12:00 UTC (12:00 UTC in your timezone). Recommended submission window is Monday - Wednesday from 09:00 to 13:00 UTC (09:00 - 13:00 UTC local).
Maintainer Strategy: Maintainer Sweet Spot: PRs under 150 lines merge in ~16 hours (81% approval). Large PRs (>500 lines) take ~115 hours (29% approval). Keep your diff compact for rapid review.
Summary rustc_codegen_cranelift does not implement the simd_funnel_shl and simd_funnel_shr intrinsics. Code using them fails to compile with: error: Unknown SIMD intrinsic simd_funnel_shl error: Unknown SIMD intrinsic simd_funnel_shr This blocks the rustc test tests/ui/simd/intrinsic/generic-arithmetic-pass.rs, which is currently skipped in scripts/test_rustc_tests.sh with the comment unimplemented simd_funnel_{shl,shr}. Reproduce #![feature(repr_simd, core_intrinsics)] #![allow(non_camel_case_types)] use std::intrinsics::simd::{simd_funnel_shl, simd_funnel_shr}; #[repr(simd)] #[derive(Copy, Clone)] struct i32x4([i32; 4]); fn main() { let x = i32x4([1, 2, 3, 4]); let y = i32x4([2, 3, 4, 5]); unsafe { let _ = simd_funnel_shl(x, y, x); let _ = simd_funnel_shr(x, y, x); } } rustc -Zcodegen-backend=cranelift repro.rs btw simd_shl and simd_shr are already implemented in src/intrinsics/simd.rs Funnel shifts combine bits from two vectors according to a per
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When evaluating whether to contribute to rust-lang/rustc_codegen_cranelift, response velocity and maintainer engagement are crucial. GetMerged continuously tracks pull request trajectories, first-comment latency, and code review rounds to help developers avoid submitting pull requests to backlogged repositories.
Currently, maintainers of rust-lang/rustc_codegen_cranelift acknowledge new external contributions in approximately -. Out of all submitted pull requests from non-core authors in the last 180-day window, 0.0% were successfully merged into the primary branch.
rust-lang/rustc_codegen_cranelift has a recorded first-timer success rate of 0.0%. Repositories ranked Risky typically provide actionable feedback during code reviews and actively nurture new community contributors.
The initial maintainer response time averages ~-. Keeping PRs scoped to single concerns and ensuring CI checks succeed will optimize review turnaround.
The C-Rank™ index scores repositories on a 0 to 100 scale using an objective formula: external PR merge rates, initial response speed, active maintainer count, and first-time contributor retention. A score of 12.0 places rust-lang/rustc_codegen_cranelift in the Risky tier.
The external pull request merge rate is 0.0%. GetMerged isolates non-core community contributions so external developers get an accurate benchmark of PR acceptance probability.
Yes, rust-lang/rustc_codegen_cranelift currently has 1 active issue(s) tagged with beginner-friendly labels. You can inspect these directly from the repository issues tab.
All metrics displayed for rust-lang/rustc_codegen_cranelift are automatically retrieved via the public GitHub API and recalculated daily. Insider pull requests submitted by repository owners or organization members are excluded from merge rate calculations to preserve objective external contributor statistics.