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cpp
1 posts6–Jul 12, 2026
Stream Compaction on NEON: Hand-Vectorizing copy_if
NEON lacks a compress instruction, so compilers can't vectorize copy_if. This piece shows how tbl-based lookup tables restore SIMD throughput with a 30x speedup.
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NEON lacks a compress instruction, so compilers can't vectorize copy_if. This piece shows how tbl-based lookup tables restore SIMD throughput with a 30x speedup.