================
@@ -4033,6 +4033,47 @@ def CIR_ThrowOp : CIR_Op<"throw"> {
// Atomic operations
//===----------------------------------------------------------------------===//
+def CIR_AtomicXchg : CIR_Op<"atomic.xchg", [
+ AllTypesMatch<["result", "val"]>
+]> {
+ let summary = "Atomic exchange";
+ let description = [{
+ C/C++ atomic exchange operation. This operation implements the C/C++
+ builtin function `__atomic_exchange`, `__atomic_exchange_n`, and
+ `__c11_atomic_exchange`.
+
+ This operation takes two arguments: a pointer `ptr` and a value `val`. The
+ operation atomically replaces the value of the object pointed-to by `ptr`
+ with `val`, and returns the original value of the object.
+
+ Example:
+
+ ```mlir
+ %res = cir.atomic.xchg(%ptr : !cir.ptr<!u64i>,
+ %val : !u64i,
+ seq_cst) : !u64i
+ ```
+ }];
+
+ let results = (outs CIR_AnyType:$result);
+ let arguments = (ins Arg<CIR_PointerType, "", [MemRead, MemWrite]>:$ptr,
+ CIR_AnyType:$val,
+ Arg<CIR_MemOrder, "memory order">:$mem_order,
+ UnitAttr:$is_volatile);
----------------
xlauko wrote:
```suggestion
let arguments = (ins
Arg<CIR_PointerType, "", [MemRead, MemWrite]>:$ptr,
CIR_AnyType:$val,
Arg<CIR_MemOrder, "memory order">:$mem_order,
UnitAttr:$is_volatile
);
```
https://github.com/llvm/llvm-project/pull/158089
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