c2dcde178d
Add an align128 sentinel type to sync/atomic and internal/runtime/atomic, analogous to align64. Embedding `_ align128` in a struct causes the compiler to enforce 16-byte alignment on the containing struct. This is required for 128-bit atomic operations (CMPXCHG16B on amd64, CASP on arm64), which require a 16-byte-aligned memory operand. A struct containing two uint64 fields has natural alignment of 8 bytes, so it may otherwise be placed at a non-16-byte-aligned offset within a larger struct, causing faults or incorrect behavior. No test: align128 is unexported in sync/atomic, and testing it in internal would create cyclic dependencies with reflect. For #61236. Change-Id: Iab0502776141aed309457b462f2fdb60ec0d5245 GitHub-Last-Rev: 8cf379404d04c1fbe2b011975d5932eb9d9225da GitHub-Pull-Request: golang/go#79991 Reviewed-on: https://go-review.googlesource.com/c/go/+/790320 Reviewed-by: Robert Griesemer <gri@google.com> LUCI-TryBot-Result: golang-scoped@luci-project-accounts.iam.gserviceaccount.com <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Keith Randall <khr@google.com> Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
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