================
@@ -4670,6 +4670,62 @@ def CIR_StackRestoreOp : CIR_Op<"stackrestore"> {
let assemblyFormat = "$ptr attr-dict `:` qualified(type($ptr))";
}
+//===----------------------------------------------------------------------===//
+// LifetimeStartOp & LifetimeEndOp
+//===----------------------------------------------------------------------===//
+
+def CIR_LifetimeStartOp : CIR_Op<"lifetime.start"> {
+ let summary = "Marks the beginning of an alloca object's live range";
+ let description = [{
+ The `cir.lifetime.start` operation marks the beginning of the live range
+ of the memory region pointed to by `$ptr`. Between this operation and a
+ matching `cir.lifetime.end` on the same pointer, the underlying storage
+ is considered live; outside that range it is considered dead, and the
+ optimizer is free to reuse the storage for other purposes.
+
+ This operation exhibits undefined behavior if:
----------------
xlauko wrote:
Bit confusing description that this `exhibits undefined behavior` since this is
technically metadata noop, so it has no behavior. Maybe the better wording
would be:
```suggestion
This operation well-formed only if:
```
https://github.com/llvm/llvm-project/pull/199599
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