Messages in this thread | | | From | David Laight <> | Subject | RE: [PATCH v2 6/6] crypto: lib/sha - Combine round constants and message schedule | Date | Tue, 20 Oct 2020 21:36:00 +0000 |
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From: Arvind Sankar > Sent: 20 October 2020 21:40 > > Putting the round constants and the message schedule arrays together in > one structure saves one register, which can be a significant benefit on > register-constrained architectures. On x86-32 (tested on Broadwell > Xeon), this gives a 10% performance benefit.
I'm actually stunned it makes that much difference. The object code must be truly horrid (before and after).
There are probably other strange tweaks that give a similar improvement.
David
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