================
@@ -855,6 +855,16 @@ void CodeGenFunction::EmitCoroutineBody(const
CoroutineBodyStmt &S) {
// Create parameter copies. We do it before creating a promise, since an
// evolution of coroutine TS may allow promise constructor to observe
// parameter copies.
+ for (const ParmVarDecl *Parm : FnArgs) {
+ // If the original param is in an alloca, exclude it from the coroutine
+ // frame. The parameter copy will be part of the frame.
----------------
rnk wrote:
Please elaborate in this comment:
```
// frame. The parameter copy will be part of the frame. The parameter copy
// will live on the heap, but the original parameter memory should remain on
// the stack. This is necessary to ensure that parameters destroyed in callees,
as
// with `trivial_abi` or in the MSVC C++ ABI, are appropriately destroyed after
// setting up the coroutine.
```
https://github.com/llvm/llvm-project/pull/127653
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