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Issues list

failure to link due to unknown relocation type in switch tables (aarch64-linux-*) A-linkage Area: linking into static, shared libraries and binaries C-bug Category: This is a bug. llvm-fixed-upstream Issue expected to be fixed by the next major LLVM upgrade, or backported fixes O-AArch64 Armv8-A or later processors in AArch64 mode O-linux Operating system: Linux P-high High priority regression-untriaged Untriaged performance or correctness regression. S-has-mcve Status: A Minimal Complete and Verifiable Example has been found for this issue T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#141737 opened May 29, 2025 by workingjubilee
Enabling LTO causes miscompilation on x86_64-apple-darwin C-bug Category: This is a bug. C-external-bug Category: issue that is caused by bugs in software beyond our control llvm-fixed-upstream Issue expected to be fixed by the next major LLVM upgrade, or backported fixes O-macos Operating system: macOS P-critical Critical priority regression-untriaged Untriaged performance or correctness regression. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#141306 opened May 20, 2025 by briansmith
17
LLVM Assertion failed when optimizing SIMD code on aarch64.apple.darwin A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. A-SIMD Area: SIMD (Single Instruction Multiple Data) C-bug Category: This is a bug. I-ICE Issue: The compiler panicked, giving an Internal Compilation Error (ICE) ❄️ llvm-fixed-upstream Issue expected to be fixed by the next major LLVM upgrade, or backported fixes O-apple Operating system: Apple (macOS, iOS, tvOS, visionOS, watchOS) T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#140933 opened May 12, 2025 by bk-eclipse
7
release builds using rustc 1.86.0 on macOS Ventura (intel) SDK exhibit incorrect behaviour A-cross Area: Cross compilation A-linkers Area: linkers... you gotta love linkers C-external-bug Category: issue that is caused by bugs in software beyond our control llvm-fixed-upstream Issue expected to be fixed by the next major LLVM upgrade, or backported fixes O-apple Operating system: Apple (macOS, iOS, tvOS, visionOS, watchOS) S-has-mcve Status: A Minimal Complete and Verifiable Example has been found for this issue T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#140686 opened May 5, 2025 by spikegrobstein
1
34
Bounds check not elided for index that should be known to be in-bounds A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. C-optimization Category: An issue highlighting optimization opportunities or PRs implementing such I-slow Issue: Problems and improvements with respect to performance of generated code. llvm-fixed-upstream Issue expected to be fixed by the next major LLVM upgrade, or backported fixes
#139759 opened Apr 13, 2025 by okaneco
2
Removing trailing zeros of a NonZero A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. C-optimization Category: An issue highlighting optimization opportunities or PRs implementing such I-slow Issue: Problems and improvements with respect to performance of generated code. llvm-fixed-upstream Issue expected to be fixed by the next major LLVM upgrade, or backported fixes
#138497 opened Mar 14, 2025 by leonardo-m
6
LLVM assertion failure on Wasm exceptions A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. C-bug Category: This is a bug. I-crash Issue: The compiler crashes (SIGSEGV, SIGABRT, etc). Use I-ICE instead when the compiler panics. llvm-fixed-upstream Issue expected to be fixed by the next major LLVM upgrade, or backported fixes O-emscripten Target: 50% off wasm32-unknown-musl. the savings come out of stdio.h, but hey, you get SDL! O-wasi Operating system: Wasi, Webassembly System Interface O-wasm Target: WASM (WebAssembly), http://webassembly.org/ T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#135665 opened Jan 18, 2025 by purplesyringa
21
slice::Iter + max on array: Regression since Rust 1.65 (LLVM 15) A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. C-bug Category: This is a bug. E-needs-test Call for participation: An issue has been fixed and does not reproduce, but no test has been added. I-slow Issue: Problems and improvements with respect to performance of generated code. llvm-fixed-upstream Issue expected to be fixed by the next major LLVM upgrade, or backported fixes P-low Low priority regression-from-stable-to-stable Performance or correctness regression from one stable version to another. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#129583 opened Aug 25, 2024 by seritools
8
Significantly worse codegen for SIMD shuffles after Rust 1.73.0 A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. C-optimization Category: An issue highlighting optimization opportunities or PRs implementing such I-slow Issue: Problems and improvements with respect to performance of generated code. llvm-fixed-upstream Issue expected to be fixed by the next major LLVM upgrade, or backported fixes P-medium Medium priority regression-untriaged Untriaged performance or correctness regression.
#129132 opened Aug 15, 2024 by TDecking
3
Inefficient Match Statement Optimization for Unit-Only Enums with Fixed Offsets A-codegen Area: Code generation A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. A-patterns Relating to patterns and pattern matching C-optimization Category: An issue highlighting optimization opportunities or PRs implementing such I-slow Issue: Problems and improvements with respect to performance of generated code. llvm-fixed-upstream Issue expected to be fixed by the next major LLVM upgrade, or backported fixes T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#129131 opened Aug 15, 2024 by Shadowcat650
3
-C target_cpu=cortex-a72 (and -target-cpu=native on Raspberry Pi) wrongly enables crypto features that are optional on Cortex-A72 A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. A-target-feature Area: Enabling/disabling target features like AVX, Neon, etc. A-targets Area: Concerning the implications of different compiler targets C-bug Category: This is a bug. I-miscompile Issue: Correct Rust code lowers to incorrect machine code I-unsound Issue: A soundness hole (worst kind of bug), see: https://en.wikipedia.org/wiki/Soundness llvm-fixed-upstream Issue expected to be fixed by the next major LLVM upgrade, or backported fixes O-AArch64 Armv8-A or later processors in AArch64 mode P-high High priority T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#125033 opened May 12, 2024 by briansmith
26
Noop loop is only optimized away when the range is half-open A-codegen Area: Code generation A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. C-bug Category: This is a bug. C-optimization Category: An issue highlighting optimization opportunities or PRs implementing such I-heavy Issue: Problems and improvements with respect to binary size of generated code. I-slow Issue: Problems and improvements with respect to performance of generated code. llvm-fixed-upstream Issue expected to be fixed by the next major LLVM upgrade, or backported fixes S-has-mcve Status: A Minimal Complete and Verifiable Example has been found for this issue T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#123845 opened Apr 12, 2024 by krtab
@veera-sivarajan
5
Match on two-variant enum optimizes poorly A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. C-optimization Category: An issue highlighting optimization opportunities or PRs implementing such I-slow Issue: Problems and improvements with respect to performance of generated code. llvm-fixed-upstream Issue expected to be fixed by the next major LLVM upgrade, or backported fixes
#122734 opened Mar 19, 2024 by clubby789
@veera-sivarajan
15
Unreachable overflow checks not optimized out of compiler-builtins i128 conversions A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. C-optimization Category: An issue highlighting optimization opportunities or PRs implementing such I-heavy Issue: Problems and improvements with respect to binary size of generated code. I-slow Issue: Problems and improvements with respect to performance of generated code. llvm-fixed-upstream Issue expected to be fixed by the next major LLVM upgrade, or backported fixes T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#116832 opened Oct 17, 2023 by saethlin
3
Excessive overflow checks that can be proven unnecessary A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. C-bug Category: This is a bug. I-slow Issue: Problems and improvements with respect to performance of generated code. llvm-fixed-upstream Issue expected to be fixed by the next major LLVM upgrade, or backported fixes T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#114386 opened Aug 2, 2023 by ProgramCrafter
@veera-sivarajan
7
AddressSanitizer detects a stack-use-after-scope in Chain::new when optimizations are enabled A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. A-sanitizers Area: Sanitizers for correctness and code quality C-bug Category: This is a bug. llvm-fixed-upstream Issue expected to be fixed by the next major LLVM upgrade, or backported fixes T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#98454 opened Jun 24, 2022 by saethlin
3
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