[libc-commits] [libc] [MLIR] Enabling Intel GPU Integration. (PR #65539)

[Guray Ozen via libc-commits]

================
@@ -811,8 +812,13 @@ LogicalResult ConvertAllocOpToGpuRuntimeCallPattern::matchAndRewrite(
   // descriptor.
   Type elementPtrType = this->getElementPtrType(memRefType);
   auto stream = adaptor.getAsyncDependencies().front();
+
+  auto isHostShared = rewriter.create<mlir::LLVM::ConstantOp>(
+      loc, llvmInt64Type, rewriter.getI64IntegerAttr(isShared));
+
   Value allocatedPtr =
-      allocCallBuilder.create(loc, rewriter, {sizeBytes, stream}).getResult();
+      allocCallBuilder.create(loc, rewriter, {sizeBytes, stream, isHostShared})
+          .getResult();
----------------
grypp wrote:

Regarding `host_shared`, I noticed this code in the examples:

```
%memref, %asyncToken = gpu.alloc async [%0] host_shared (): memref<3x3xi64>
```

Can SYCL's runtime allocate `host_shared` data asynchronously? It might be a good idea to prevent the use of `host_shared` and `async` together. FWIW, CUDA and HIP cannot do that. As far as I can see from the PR, the queue is not used when allocating `host_shared`.

Nonetheless, having `async` on `gpu.alloc` is perfectly acceptable. CUDA does support asynchronous device memory allocation.

https://github.com/llvm/llvm-project/pull/65539