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Improve ISAAC performance (take 2)#45

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dhardy merged 8 commits intodhardy:masterdhardy/rand:masterfrom pitdicker:isaac_optimpitdicker/rand:isaac_optimCopy head branch name to clipboardNov 11, 2017

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Commits on Nov 11, 2017

• Add rand_core::impl::fill_via_u*_chunks

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• Convert ChaCha to use fill_via_u32_chunks

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• Fill isaac backwards, and use fill_via_u32_chunks

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• Fill isaac64 backwards, and use fill_via_u32_chunks

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• Improve performance of isaac64::next_u32.

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• Remove complex indexing, use a bool.

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• Add test for alternating between next_u64 and next_u32

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• Improve documentation

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