rust-lang/stdarch

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Rust's standard library vendor-specific APIs and run-time feature detection

Stars: 694
Forks: 336
Open beginner issues: 0
Indexed issues: 63
Avg merge: 5d 14h
Merged PRs (30d): 9

Dominant language: Rust
License: Apache-2.0
Last GitHub push: Sep 17, 2026
Latest indexed: Sep 19, 2026
Contributing guide: Contributing guide
Code of conduct: No code of conduct
Beginner labels: help wanted

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63 open issues indexed

CI should be pinned to a particular rustc version Open

Difficulty 2/5 1-3 hours Newbie friendliness 68/100

rust-lang/stdarch#2218 · 5 comments · Opened Sep 5, 2026
Are there other intrinsics like _mm_maskmoveu_si128 that require mutable memory even when no mutation occurs? Open

Difficulty 3/5 1-2 days Newbie friendliness 64/100

rust-lang/stdarch#2216 · 1 comment · Opened Aug 31, 2026
Can non-temporal loads use the LLVM intrinsic instead? Open

Difficulty 3/5 1-2 days Newbie friendliness 48/100

rust-lang/stdarch#2155 · Opened Jun 7, 2026
`_mm_adds_epu8` doesn't generate the right instruction. Open

Difficulty 3/5 1-2 days Newbie friendliness 55/100

rust-lang/stdarch#2154 · 1 comment · Opened Jun 7, 2026
Should the `p64` functions be gated under `aes`? Open

Difficulty 4/5 3-5 days Newbie friendliness 52/100

rust-lang/stdarch#2109 · 6 comments · Opened May 8, 2026
re-enable `assert_instr` for SVE `[us]mull[bt]` instructions Open

A-aarch64

rust-lang/stdarch#2084 · 1 comment · 1 assignee · Opened Apr 15, 2026
s390x: incorrect use of LLVM intrinsics for vec_min/max on floats Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

rust-lang/stdarch#2060 · 13 comments · Opened Mar 11, 2026
nvptx: Incorrect use of LLVM intrinsics for f16x2_min/max(_nan) Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

rust-lang/stdarch#2056 · Opened Mar 10, 2026
CUDA links are broken Open

Difficulty 2/5 1-3 hours Newbie friendliness 45/100

rust-lang/stdarch#2055 · 2 comments · Opened Mar 10, 2026
Now-safe `cpuid` triggers `unused_unsafe` Open

Difficulty 4/5 3-5 days Newbie friendliness 32/100

rust-lang/stdarch#1990 · 3 comments · Opened Jan 7, 2026
Use `intrinsics::simd` for LoongArch LSX/LASX Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

rust-lang/stdarch#1982 · 3 comments · 1 reaction · Opened Dec 28, 2025
Speeding up `intrinsic-test` Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

rust-lang/stdarch#1851 · 4 comments · Opened Jul 8, 2025
Define unaligned vector types in stdarch Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

rust-lang/stdarch#1836 · 5 comments · 1 reaction · Opened Jun 27, 2025
RISC-V RVV intrinsics are missing Open

Difficulty 5/5 Over a week Newbie friendliness 30/100

rust-lang/stdarch#1817 · 3 comments · Opened Jun 2, 2025
Broken docs for std-detect on docs.rs Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

rust-lang/stdarch#1799 · 5 comments · Opened May 16, 2025
Some target features are not available in CI tests Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

rust-lang/stdarch#1787 · Opened Apr 23, 2025
aarch64: use portable SIMD intrinsics where possible Open

Difficulty 5/5 Over a week Newbie friendliness 32/100

rust-lang/stdarch#1659 · 1 comment · Opened Oct 24, 2024
Change PR strategy from rebase to merge? Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

rust-lang/stdarch#1501 · 6 comments · Opened Nov 21, 2023
Support prctl(PR_GET_AUXV) as fallback when getauxval doesn't exist Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

rust-lang/stdarch#1480 · Opened Oct 10, 2023
Deprecate all floating-point status register functions across architectures Open

Difficulty 4/5 3-5 days Newbie friendliness 38/100

rust-lang/stdarch#1479 · 10 comments · Opened Oct 9, 2023
re-enable the currently disable ppc tests once qemu is fixed Open

A-powerpc A-testing

Difficulty 3/5 1-2 days Newbie friendliness 25/100

rust-lang/stdarch#1425 · 2 comments · Opened May 2, 2023
Change Status flags in EFLAGS(ZF) Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

rust-lang/stdarch#1287 · 3 comments · Opened Mar 3, 2022
p64 load/store intrinsics not properly inlined on arm Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

rust-lang/stdarch#1236 · 2 comments · Opened Oct 22, 2021
the neon section is not properly documented Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

rust-lang/stdarch#1222 · Opened Sep 24, 2021
Inlining checks are broken for arm Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

rust-lang/stdarch#1210 · 2 comments · Opened Sep 8, 2021
Multiple tests fail on Macos aarch64 Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

rust-lang/stdarch#1206 · 8 comments · Opened Sep 7, 2021
Stabilize existing neon instrinsics Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

rust-lang/stdarch#1125 · 11 comments · Opened Apr 19, 2021
cleanup: Move cfg(tests) modules to its own files Open

Difficulty 3/5 1-2 days Newbie friendliness 38/100

rust-lang/stdarch#1029 · 1 comment · Opened Mar 1, 2021
Is there any way to call a llvm intrinisc API which contains type like llvm_v4i1_ty? Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

rust-lang/stdarch#989 · 4 comments · Opened Jan 30, 2021
RISC-V core::arch? Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

rust-lang/stdarch#913 · 12 comments · 2 reactions · Opened Sep 18, 2020
Make constructors `const fn` where possible Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

rust-lang/stdarch#906 · 13 comments · Opened Sep 14, 2020
x86_64 MXCSR denormals are zero bit: add constant Open

Difficulty 2/5 1-3 hours Newbie friendliness 50/100

rust-lang/stdarch#852 · 5 comments · 2 reactions · Opened May 2, 2020
Inconsistency between documented and real arm version inserted breakpoint Open

Difficulty 1/5 Under an hour Newbie friendliness 48/100

rust-lang/stdarch#826 · Opened Nov 2, 2019
Add a miri test to ci Open

A-testing help wanted

Difficulty 3/5 1-2 days Newbie friendliness 45/100

rust-lang/stdarch#805 · 6 comments · Opened Sep 2, 2019
x86 intrinsics missing runtime tests Open

A-testing A-x86 help wanted

Difficulty 4/5 3-5 days Newbie friendliness 48/100

rust-lang/stdarch#798 · 2 comments · Opened Aug 17, 2019
Deprecate MXCSR intrinsics Open

A-x86 bug P-high

Difficulty 3/5 1-2 days Newbie friendliness 35/100

rust-lang/stdarch#781 · 9 comments · 4 reactions · Opened Jul 16, 2019
ACLE Module implementation status Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

rust-lang/stdarch#759 · 1 comment · Opened May 9, 2019
Using procedural macros in core_arch Open

rust-lang/stdarch#749 · 8 comments · 1 assignee · Opened Apr 27, 2019
Implement Intel HLE and RTM intrinsics Open

feature-request

Difficulty 4/5 3-5 days Newbie friendliness 38/100

rust-lang/stdarch#718 · 7 comments · 2 reactions · Opened Apr 14, 2019
Fix docs of arm acle intrinsics Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

rust-lang/stdarch#717 · Opened Apr 14, 2019
Check for adcx instruction in the addcarryx intrinsics instead of just adc Open

A-llvm

Difficulty 3/5 1-2 days Newbie friendliness 32/100

rust-lang/stdarch#666 · 31 comments · 1 reaction · Opened Jan 31, 2019
Document #[no_mangle] requirement in assert-instr / stdsimd-test Open

Difficulty 2/5 1-3 hours Newbie friendliness 38/100

rust-lang/stdarch#664 · 1 comment · Opened Jan 31, 2019
assert_instr calling convention for windows targets might be broken Open

A-testing

Difficulty 4/5 3-5 days Newbie friendliness 35/100

rust-lang/stdarch#594 · Opened Nov 10, 2018
List of known bugs in the stable intrinsics APIs Open

Difficulty 3/5 1-2 days Newbie friendliness 38/100

rust-lang/stdarch#587 · Opened Nov 5, 2018
incorrect run-time feature detection for targets between late-486 and pentium III Open

A-x86 bug

Difficulty 4/5 3-5 days Newbie friendliness 35/100

rust-lang/stdarch#572 · 2 comments · Opened Sep 21, 2018
assert_instr fails when using lld as a linker on linux Open

A-testing E-easy help wanted

Difficulty 4/5 3-5 days Newbie friendliness 25/100

rust-lang/stdarch#565 · 2 comments · Opened Sep 10, 2018
Extend the verification crate for powerpc Open

A-powerpc A-testing

Difficulty 5/5 Over a week Newbie friendliness 20/100

rust-lang/stdarch#552 · 1 comment · Opened Aug 19, 2018
_MM_SHUFFLE has incorrect return type Open

A-x86 P-high

Difficulty 2/5 1-3 hours Newbie friendliness 68/100

rust-lang/stdarch#522 · 26 comments · Opened Jul 12, 2018
Implement VSX Intrinsics Open

A-powerpc

Difficulty 5/5 Over a week Newbie friendliness 25/100

rust-lang/stdarch#463 · Opened May 24, 2018
Implement Altivec intrinsics Open

A-powerpc

Difficulty 5/5 Over a week Newbie friendliness 25/100

rust-lang/stdarch#462 · Opened May 24, 2018

rust-lang/stdarch

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