A faster sum implementation (using four-way accumulation)
better explanation of the micro-optimization of sum_seq
A faster sum implementation (using four-way accumulation)
better explanation of the micro-optimization of sum_seq
modified sum based on Steven's comments.
Merge branch 'dh/fastsum' of https://github.com/lindahua/julia into dh/fastsum
move @inbounds to the beginning of the if-else block (for sum_seq)
Merge pull request #5235 from lindahua/dh/fastsum

Faster implementation of sum