1 files changed, 16 insertions, 12 deletions

diff --git a/mlir/lib/Conversion/MemRefToSPIRV/MemRefToSPIRV.cpp b/mlir/lib/Conversion/MemRefToSPIRV/MemRefToSPIRV.cpp
index c7ecd83..2e00b42 100644
--- a/mlir/lib/Conversion/MemRefToSPIRV/MemRefToSPIRV.cpp
+++ b/mlir/lib/Conversion/MemRefToSPIRV/MemRefToSPIRV.cpp
@@ -22,6 +22,7 @@
 #include "mlir/IR/MLIRContext.h"
 #include "mlir/IR/Visitors.h"
 #include <cassert>
+#include <limits>
 #include <optional>
 
 #define DEBUG_TYPE "memref-to-spirv-pattern"
@@ -475,7 +476,12 @@ struct MemoryRequirements {
 /// Given an accessed SPIR-V pointer, calculates its alignment requirements, if
 /// any.
 static FailureOr<MemoryRequirements>
-calculateMemoryRequirements(Value accessedPtr, bool isNontemporal) {
+calculateMemoryRequirements(Value accessedPtr, bool isNontemporal,
+                            uint64_t preferredAlignment) {
+  if (preferredAlignment >= std::numeric_limits<uint32_t>::max()) {
+    return failure();
+  }
+
   MLIRContext *ctx = accessedPtr.getContext();
 
   auto memoryAccess = spirv::MemoryAccess::None;
@@ -484,7 +490,10 @@ calculateMemoryRequirements(Value accessedPtr, bool isNontemporal) {
   }
 
   auto ptrType = cast<spirv::PointerType>(accessedPtr.getType());
-  if (ptrType.getStorageClass() != spirv::StorageClass::PhysicalStorageBuffer) {
+  bool mayOmitAlignment =
+      !preferredAlignment &&
+      ptrType.getStorageClass() != spirv::StorageClass::PhysicalStorageBuffer;
+  if (mayOmitAlignment) {
     if (memoryAccess == spirv::MemoryAccess::None) {
       return MemoryRequirements{spirv::MemoryAccessAttr{}, IntegerAttr{}};
     }
@@ -493,6 +502,7 @@ calculateMemoryRequirements(Value accessedPtr, bool isNontemporal) {
   }
 
   // PhysicalStorageBuffers require the `Aligned` attribute.
+  // Other storage types may show an `Aligned` attribute.
   auto pointeeType = dyn_cast<spirv::ScalarType>(ptrType.getPointeeType());
   if (!pointeeType)
     return failure();
@@ -504,7 +514,8 @@ calculateMemoryRequirements(Value accessedPtr, bool isNontemporal) {
 
   memoryAccess = memoryAccess | spirv::MemoryAccess::Aligned;
   auto memAccessAttr = spirv::MemoryAccessAttr::get(ctx, memoryAccess);
-  auto alignment = IntegerAttr::get(IntegerType::get(ctx, 32), *sizeInBytes);
+  auto alignmentValue = preferredAlignment ? preferredAlignment : *sizeInBytes;
+  auto alignment = IntegerAttr::get(IntegerType::get(ctx, 32), alignmentValue);
   return MemoryRequirements{memAccessAttr, alignment};
 }
 
@@ -518,16 +529,9 @@ calculateMemoryRequirements(Value accessedPtr, LoadOrStoreOp loadOrStoreOp) {
       llvm::is_one_of<LoadOrStoreOp, memref::LoadOp, memref::StoreOp>::value,
       "Must be called on either memref::LoadOp or memref::StoreOp");
 
-  Operation *memrefAccessOp = loadOrStoreOp.getOperation();
-  auto memrefMemAccess = memrefAccessOp->getAttrOfType<spirv::MemoryAccessAttr>(
-      spirv::attributeName<spirv::MemoryAccess>());
-  auto memrefAlignment =
-      memrefAccessOp->getAttrOfType<IntegerAttr>("alignment");
-  if (memrefMemAccess && memrefAlignment)
-    return MemoryRequirements{memrefMemAccess, memrefAlignment};
-
   return calculateMemoryRequirements(accessedPtr,
-                                     loadOrStoreOp.getNontemporal());
+                                     loadOrStoreOp.getNontemporal(),
+                                     loadOrStoreOp.getAlignment().value_or(0));
 }
 
 LogicalResult