[Mlir-commits] [mlir] [mlir][gpu] Introduce `gpu.dynamic_shared_memory` Op (PR #71546)

[Mehdi Amini]

================
@@ -554,6 +557,101 @@ static IntegerAttr wrapNumericMemorySpace(MLIRContext *ctx, unsigned space) {
   return IntegerAttr::get(IntegerType::get(ctx, 64), space);
 }
 
+/// Generates a symbol with 0-sized array type for dynamic shared memory usage,
+/// or uses existing symbol.
+LLVM::GlobalOp
+getDynamicSharedMemorySymbol(ConversionPatternRewriter &rewriter,
+                             gpu::DynamicSharedMemoryOp op,
+                             const LLVMTypeConverter *typeConverter,
+                             MemRefType memrefType, unsigned alignmentBit) {
+  LLVM::LLVMFuncOp funcOp = op->getParentOfType<LLVM::LLVMFuncOp>();
+  assert(funcOp && "cannot find llvm.func op");
+
+  gpu::GPUModuleOp moduleOp = funcOp->getParentOfType<gpu::GPUModuleOp>();
+  assert(moduleOp && "cannot find gpu.module op");
+
+  uint64_t alignmentByte = alignmentBit / memrefType.getElementTypeBitWidth();
+
+  LLVM::GlobalOp existingGlobalOp;
+  moduleOp->walk([&](LLVM::GlobalOp globalOp) {
----------------
joker-eph wrote:

Walk is recursive and quite expensive, seems a bit overkill: can you iterate `getOperations<LLVM::GlobalOp>()` instead?

https://github.com/llvm/llvm-project/pull/71546