================
@@ -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 `$ptr`. Between this operation and a
+ matching `cir.lifetime.end` on the same pointer, the underlying storage
+ is considered live; outside that range it is considered dead, and the
+ optimizer is free to reuse the storage for other purposes.
+
+ The verifier requires `$ptr` to be produced by a `cir.alloca`. For the
+ live range to be meaningful, a matching `cir.lifetime.end` on the same
+ pointer should follow on every control-flow path.
+
+ This operation corresponds to the LLVM intrinsic `llvm.lifetime.start`.
+
+ Example:
+ ```
+ cir.lifetime.start %ptr : !cir.ptr<!s32i>
+ ```
+ }];
+
+ let arguments = (ins CIR_PointerType:$ptr);
+ let assemblyFormat = "$ptr attr-dict `:` qualified(type($ptr))";
+ let hasVerifier = 1;
+}
+
+def CIR_LifetimeEndOp : CIR_Op<"lifetime.end"> {
+ let summary = "Marks the end of an alloca object's live range";
+ let description = [{
+ The `cir.lifetime.end` operation marks the end of the live range of the
+ memory region pointed to by `$ptr`. After this operation the underlying
+ storage is considered dead until a subsequent `cir.lifetime.start` on
+ the same pointer; accesses to the storage in the dead range are
+ undefined behavior.
+
+ The verifier requires `$ptr` to be produced by a `cir.alloca`. It should
----------------
erichkeane wrote:
```suggestion
The verifier requires `$ptr` to be produced by a `cir.alloca`.
`lifetime.end` should
```
https://github.com/llvm/llvm-project/pull/199599
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