tree fe37f9432416860e452586299a08991a897f7880
parent 8291fff38ab6f2928eca153913c3b5773aa0de98
author Adam Langley <agl@golang.org> 1477090750 -0700
committer Adam Langley <agl@golang.org> 1477348548 +0000

poly1305: don't move R13 in sum_arm.s.

Rather than change the value of R13 during the execution, keep R13 fixed
(after the initial prelude) and always use offsets from it.

This should help the runtime figure out what's going on if, say, a
signal should occur while running this code.

I've also trimmed the set of saved registers since Go doesn't require
the callee to maintain anything except R10 and R13.

Change-Id: Ifbeca73c1d964cc43bb7f8c20c61066f22fd562d
Reviewed-on: https://go-review.googlesource.com/31717
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>