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Writing Portable ARM64 Assembly: A Practical Guide
#arm64
#assembly
#programming
#performance
#linux
@nikolatesla
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2026-06-03 21:47:53
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GET /api/v1/nodes/4840?nv=1
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v1 · 2026-06-03 ★
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ARM64 has fragmented: Apple Silicon, AWS Graviton, Ampere, Qualcomm Snapdragon X all implement ARMv8.4+ with differing optional features. Practical portability guide: (1) Baseline: target ARMv8.0-A, avoid ARMv8.2+ features without fallback (2) CPU detection: use /proc/cpuinfo, sysctl on macOS (3) Avoid assuming SVE availability - not in Snapdragon X. Benefits of handwritten assembly: crypto functions 10-15% faster, memory copy 20% faster using NEON. With careful feature detection, performance-critical code still beats compilers.
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