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2017 Apr 13
2
Improve the performance of JamCRC
Lldb relies heavily on crc when loading shared libraries. The existing implementation is quite slow as it computes a byte at a time, creating a long dependency chain. Unfortunately the polynomial is not the same as the one implemented by x86 processors in SSE 4.2, but there's another way to make it faster by using more lookup tables. Zlib implements this, but rather than require zlib, I