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Dave Cheney authored
Fixes #9855 Use an architectural zero register as the source for zeroing, if available. Change-Id: Ie5b4ba4e3d356c6f892bfd1cebd14d5152bdeeb0 Reviewed-on: https://go-review.googlesource.com/8722Reviewed-by: Keith Randall <khr@golang.org>
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