On 5/14/26 10:37, James Hilliard wrote:
Implement the Octeon LA* read-modify-write atomic instruction family:
LAI/LAID, LAD/LADD, LAA/LAAD, LAS/LASD, LAC/LACD, and LAW/LAWD.
These operations are architecturally distinct from SAA/SAAD and are used
by existing Octeon user-mode code for atomic counters, bit operations,
and exchange-style updates.
Signed-off-by: James Hilliard<[email protected]>
---
Changes v1 -> v2:
- Keep LA* atomics naturally aligned per Octeon L2 transaction
semantics.
- Use explicit i64 TCG ops in the LA* translator paths. (suggested by
Philippe Mathieu-Daudé)
Changes v2 -> v3:
- Drop redundant TARGET_LONG_BITS guards from doubleword atomic paths.
(suggested by Richard Henderson)
- Group LA* translator wrappers by argument shape instead of adding one
wrapper per instruction. (suggested by Richard Henderson)
Changes v3 -> v4:
- Use i64 atomic helpers for both word and doubleword paths and select
word sign-extension through MO_SL. (suggested by Richard Henderson)
Changes v5 -> v6:
- Rename the shared translator helpers to distinguish fetch-add and
exchange operations.
---
target/mips/tcg/octeon.decode | 17 +++++++++
target/mips/tcg/octeon_translate.c | 74 ++++++++++++++++++++++++++++++++++++++
2 files changed, 91 insertions(+)
Reviewed-by: Richard Henderson <[email protected]>
r~
