Improving Parser Performance using SSE Instructions (in case of PicoHTTPParser)

PCMPxSTRx is a SIMD instruction that can be used for parsing text. In _SIDD_CMP_RANGES mode, it checks at most 16 bytes at once, if each byte is within given set of ranges. Herumi and I have created a wrapper function for the instruction named findchar_fast that iterates though every 16 bytes of a given buffer to find the first occurrence of a byte within a set of given ranges. And the function is

[yosuke_furukawa]

Streaming SIMD Extensionsを利用することにより、さらに速くなった picohttpparser

[mattn]

へー SSE4.2 って文字列命令あるんだ。