Individual skill
simd-intrinsics
Use when reading auto-vectorization reports, writing SSE2, AVX2, or NEON intrinsics, or fixing vectorization failures. Not for reading the asm itself: use assembly-x86.
.devin/skills/simd-intrinsics/SKILL.md
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- Last checked
- Nov 4, 2026
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- Sep 28, 2026
- License
- Apache-2.0
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SKILL.mdcore · 6,394 bytesSKILL.mdcore · 6,394 bytesagents/openai.yamlasset · 187 bytesreferences/intel-intrinsics-guide.mddoc · 3,806 bytes
Read excerpt
# SIMD intrinsics
Let the compiler vectorize first; write intrinsics where it cannot. Every intrinsic code path needs a runtime feature check and a scalar fallback, because the binary runs on CPUs the build machine never saw.
## Contract
| Field | Bound contract |
|---|---|
| Trigger | The task writes SSE2, AVX2, or NEON intrinsics, reads `-Rpass-missed` or `-fopt-info-vec` reports, adds runtime CPU dispatch, or explains why a loop did not vectorize. |
| Authority | Read-only. The skill explains and drafts; edits land through the normal coding path. No remote mutation. |
| Side effect | None. |
| Done | The vector path is guarded by a compile-time target and a runtime feature check, the scalar fallback exists, and the speedup is measured on the target machine. |
## Inputs