[llvm] [GlobalIsel] Add failure memory order to LegalityQuery (NFC) (PR #162284)
Mészáros Gergely via llvm-commits
llvm-commits at lists.llvm.org
Tue Oct 7 06:58:41 PDT 2025
================
@@ -115,14 +115,17 @@ struct LegalityQuery {
struct MemDesc {
LLT MemoryTy;
uint64_t AlignInBits;
- AtomicOrdering Ordering;
+ AtomicOrdering Ordering; //< For cmpxchg this is the success ordering.
+ AtomicOrdering FailureOrdering; //< For cmpxchg, otherwise NotAtomic.
MemDesc() = default;
- MemDesc(LLT MemoryTy, uint64_t AlignInBits, AtomicOrdering Ordering)
- : MemoryTy(MemoryTy), AlignInBits(AlignInBits), Ordering(Ordering) {}
+ MemDesc(LLT MemoryTy, uint64_t AlignInBits, AtomicOrdering Ordering,
+ AtomicOrdering FailureOrdering)
----------------
Maetveis wrote:
I was thinking of adding a default value of `AtomicOrdering::NotAtomic` to `FailureOrdering`, but I decided that being explicit might be better.
I don't feel strongly about this though. Without it this might potentially require modifications in downstream forks.
https://github.com/llvm/llvm-project/pull/162284
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