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Issues list

More instructions generated for Ord::clamp than manual max(X).min(Y) for saturating truncating cast from i32 to u8 A-autovectorization Area: Autovectorization, which can impact perf or code size A-codegen Area: Code generation C-optimization Category: An issue highlighting optimization opportunities or PRs implementing such 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.
#125738 opened May 29, 2024 by okaneco
1
Autovectorization fails if a field follows an array A-autovectorization Area: Autovectorization, which can impact perf or code size C-optimization Category: An issue highlighting optimization opportunities or PRs implementing such 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.
#121276 opened Feb 18, 2024 by EsotericPyramid
1
for loop in closure is not unrolled and not vectorlized correctly A-autovectorization Area: Autovectorization, which can impact perf or code size 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.
#120189 opened Jan 21, 2024 by shuangsilab
1
Rustc fails to perform autovectorization for a loop when targeting aarch64-apple-darwin A-autovectorization Area: Autovectorization, which can impact perf or code size 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. O-AArch64 Armv8-A or later processors in AArch64 mode T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#117345 opened Oct 29, 2023 by Pzixel
Missed autovectorization for slice.iter.fold, works for slice.iter.copied.fold A-autovectorization Area: Autovectorization, which can impact perf or code size A-codegen Area: Code generation 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.
#113789 opened Jul 17, 2023 by jhorstmann
5
Initialization of stack-based arrays does not get automatically vectorized. A-autovectorization Area: Autovectorization, which can impact perf or code size C-bug Category: This is a bug. I-slow Issue: Problems and improvements with respect to performance of generated code. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#112459 opened Jun 9, 2023 by TDecking
SIMD path never taken in simple vectorized loop A-autovectorization Area: Autovectorization, which can impact perf or code size 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-slow Issue: Problems and improvements with respect to performance of generated code. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#108187 opened Feb 17, 2023 by linkmauve
5
rustc can not inline simple for-loop when arm neon is enabled A-autovectorization Area: Autovectorization, which can impact perf or code size A-codegen Area: Code generation A-SIMD Area: SIMD (Single Instruction Multiple Data) A-target-feature Area: Enabling/disabling target features like AVX, Neon, etc. C-bug Category: This is a bug. O-Arm Target: 32-bit Arm processors (armv6, armv7, thumb...), including 64-bit Arm in AArch32 state T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#102220 opened Sep 24, 2022 by Nugine
1
Codegen weirdness for sum of count_ones over an array A-autovectorization Area: Autovectorization, which can impact perf or code size 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. I-slow Issue: Problems and improvements with respect to performance of generated code. O-x86_64 Target: x86-64 processors (like x86_64-*) P-high High 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. WG-llvm Working group: LLVM backend code generation
#101060 opened Aug 26, 2022 by alion02
8
Tracking Issue for Iterator::next_chunk A-autovectorization Area: Autovectorization, which can impact perf or code size C-tracking-issue Category: A tracking issue for an RFC or an unstable feature. T-libs-api Relevant to the library API team, which will review and decide on the PR/issue.
#98326 opened Jun 21, 2022 by rossmacarthur
1 of 3 tasks
19
Strange ASM pessimizations as a result of algorithmic optimization A-autovectorization Area: Autovectorization, which can impact perf or code size 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. I-slow Issue: Problems and improvements with respect to performance of generated code. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#92119 opened Dec 20, 2021 by HadrienG2
5
align_to prefix max length not taken into account in optimization A-autovectorization Area: Autovectorization, which can impact perf or code size 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-slow Issue: Problems and improvements with respect to performance of generated code. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#72356 opened May 19, 2020 by hsivonen
4
LLVM pointer range loop / autovectorization regression part two A-autovectorization Area: Autovectorization, which can impact perf or code size A-LLVM Area: Code generation parts specific to LLVM. Both correctness bugs and optimization-related issues. C-enhancement Category: An issue proposing an enhancement or a PR with one. I-slow Issue: Problems and improvements with respect to performance of generated code. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
#37276 opened Oct 19, 2016 by bluss
2
ProTip! no:milestone will show everything without a milestone.