Rust fast `&str` to `i64` parser (x86_64 SIMD, SSE4.1)

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Parsing atoi_simd
Overview

Rust fast &str to i64 parser (x86_64 SIMD, SSE4.1)

Modified this version to support various string length and negative values.

You need to define the target-cpu for it to build with optimized performance.

For example -e RUSTFLAGS="-C target-cpu=native"

Maybe this would work instead: -e RUSTFLAGS="-C target-feature=+sse2,+sse3,+sse4.1,+ssse3". But it hasn't been tested yet.

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