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unrolling or data dependent loops
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mkcolg



Joined: 30 Jun 2004
Posts: 6639
Location: The Portland Group Inc.

PostPosted: Mon Mar 11, 2013 10:45 am    Post subject: Reply with quote

Quote:
If that is true of what advantage is unrolling?
Besides the reduction in branching, which can be quite costly, the compiler can better perform instruction scheduling, memory prefetching (which benefits caching), and may be able to eliminate repeated instrucitons.

- Mat
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