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arm-sve

Use when writing or porting AArch64 SIMD to SVE or SVE2: arm_sve.h intrinsics, predicates, vector-length-agnostic loops, auto-vectorization, or SVE registers in GDB. Not for NEON: use simd-intrinsics.

.devin/skills/arm-sve/SKILL.md

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Last checked
Nov 4, 2026

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Repository last updated
Sep 28, 2026
License
Apache-2.0

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# Arm SVE and SVE2

## Contract

| Field | Bound contract |
|---|---|
| Trigger | AArch64 code needs vector-length-agnostic SIMD: a NEON loop is being ported, an `arm_sve.h` kernel is being written, auto-vectorization to SVE is being checked, or SVE register state is being inspected in GDB. |
| Authority | Reversible local: writes only the source files the user names; rollback is reverting them in version control. No remote mutation. |
| Side effect | New or edited C sources. Runs the binary on the host or under QEMU for verification. |
| Done | The kernel compiles with `-march=armv9-a+sve2`, produces the same result as the scalar reference for lengths that are not a multiple of the vector length, and runs correctly at two different vector lengths (hardware and QEMU, or two QEMU `sve<N>` settings). |

## Inputs

- Source loop or NEON kernel to port, with a scalar reference to compare against.