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include/exec/memop.h: Expand comment for MO_ATOM_SUBALIGN

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Expand the example in the comment documenting MO_ATOM_SUBALIGN,
to be clearer about the atomicity guarantees it represents.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20250228103222.1838913-1-peter.maydell@linaro.org
This commit is contained in:
Peter Maydell 2025-02-28 10:32:22 +00:00
parent 02ae315467
commit 84e5ce68c0
1 changed files with 6 additions and 2 deletions
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8
include/exec/memop.h
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@ -91,8 +91,12 @@ typedef enum MemOp {
* Depending on alignment, one or both will be single-copy atomic.
* This is the atomicity e.g. of Arm FEAT_LSE2 LDP.
* MO_ATOM_SUBALIGN: the operation is single-copy atomic by parts
* by the alignment. E.g. if the address is 0 mod 4, then each
* 4-byte subobject is single-copy atomic.
* by the alignment. E.g. if an 8-byte value is accessed at an
* address which is 0 mod 8, then the whole 8-byte access is
* single-copy atomic; otherwise, if it is accessed at 0 mod 4
* then each 4-byte subobject is single-copy atomic; otherwise
* if it is accessed at 0 mod 2 then the four 2-byte subobjects
* are single-copy atomic.
* This is the atomicity e.g. of IBM Power.
* MO_ATOM_NONE: the operation has no atomicity requirements.
*