Optimization in hash chain comparison for 64 bit Arrays were compared 32 bits at a time, it is now done 64 bits at a time. Overall encoding speed-up is only of 0.2% on @skal's small PNG corpus. It is of 3% on my initial 1.3 Mp desktop screenshot image.
Optimization in hash chain comparison for 64 bit
Arrays were compared 32 bits at a time, it is now done 64 bits at a time.
Overall encoding speed-up is only of 0.2% on @skal's small PNG corpus.
It is of 3% on my initial 1.3 Mp desktop screenshot image.

Change-Id: I1acb32b437397a7bf3dcffbecbcd4b06d29c05e1

PKRoma/libwebp,PKRoma/libwebp,PKRoma/libwebp,webmproject/libwebp,PKRoma/libwebp,PKRoma/libwebp,webmproject/libwebp,ttyangf/libwebp,ttyangf/libwebp,webmproject/libwebp,ttyangf/libwebp,webmproject/libwebp,ttyangf/libwebp,PKRoma/libwebp,ttyangf/libwebp,webmproject/libwebp