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Make sure that all the targets of 64-bit atomic operations are actually aligned to 8 bytes. This has been a source of bugs on 32-bit systems. (e.g. CL 399754) The strategy is to have a simple test that just checks the alignment of some explicitly listed fields and global variables. Then there's a more complicated test that makes sure the list used in the simple test is exhaustive. That test has some limitations, but it should catch most cases, particularly new uses of atomic operations on new or existing fields. Unlike a runtime assert, this check is free and will catch accesses that occur even in very unlikely code paths. Change-Id: I25ac78df471ac33b57cb91375bd8453d6ce2814f Reviewed-on: https://go-review.googlesource.com/c/go/+/407034 Run-TryBot: Keith Randall <khr@golang.org> Reviewed-by: Michael Knyszek <mknyszek@google.com> Reviewed-by: David Chase <drchase@google.com> TryBot-Result: Gopher Robot <gobot@golang.org> |
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