[mlir] MemRefToSPIRV propagate alignment attributes from MemRef ops. #151723

amd-eochoalo · 2025-08-01T16:24:12Z

This patchset:

propagates alignment attributes from memref operations into the SPIR-V dialect,
fixes an error in the logic which previously propagated alignment attributes but did not add other MemoryAccess attributes.
adds a failure condition in the case where the alignment attribute from the memref dialect (64-bit wide) does not fit in SPIR-V's alignment attribute (specified to be 32-bit wide).

github-actions · 2025-08-01T16:24:32Z

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kuhar · 2025-08-01T18:35:09Z

It is unclear to me at the moment whether non-PhysicalStorageBuffers may have an alignment attribute. At the moment I am assuming they won't.

PSB requires alignment, and in the other storage classes alignment is optional.

The alignment attribute added to the SPIR-V operations is 32-bits wide while the alignment attribute in MemRef operations is 64-bits wide. I would recommend changing this to 64-bits per this comment. . However, the current definition constraints alignment to be 32 bits wide.

This is because the SPIR-V spec specifies alignment as a 32-bit power-of-two number.

There was an early return in calculateMemoryRequirements that looked explicitly for alignment and only set the alignment attribute. However, this was not correct for the following reasons: * Alignment was set only if both the alignment and the memory_access attributes were both present in the memref operation, without handling the case when only the alignment was exclusively present. * In the case alignment and memory_access attributes were both present, the memory_access attribute would not be updated to aligned if the memory_access attribute was not marked aligned. * In the case alignment and memory_access attributes were both present, other memory requirements (e.g., non_temporal) would not be added as attributes.

mlir/test/Conversion/MemRefToSPIRV/memref-to-spirv.mlir

llvmbot · 2025-08-01T19:39:02Z

@llvm/pr-subscribers-mlir

Author: Erick Ochoa Lopez (amd-eochoalo)

Changes

Propagating alignment attributes from memref operations into the SPIR-V dialect.

Full diff: https://github.com/llvm/llvm-project/pull/151723.diff

2 Files Affected:

(modified) mlir/lib/Conversion/MemRefToSPIRV/MemRefToSPIRV.cpp (+17-12)
(modified) mlir/test/Conversion/MemRefToSPIRV/memref-to-spirv.mlir (+45)

diff --git a/mlir/lib/Conversion/MemRefToSPIRV/MemRefToSPIRV.cpp b/mlir/lib/Conversion/MemRefToSPIRV/MemRefToSPIRV.cpp
index 7a705336bf11c..e730998f153b0 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"
@@ -465,7 +466,13 @@ 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 (std::numeric_limits<uint32_t>::max() < preferredAlignment) {
+    return failure();
+  }
+
   MLIRContext *ctx = accessedPtr.getContext();
 
   auto memoryAccess = spirv::MemoryAccess::None;
@@ -474,7 +481,10 @@ 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{}};
     }
@@ -483,6 +493,7 @@ 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();
@@ -494,7 +505,8 @@ 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};
 }
 
@@ -508,16 +520,9 @@ 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
diff --git a/mlir/test/Conversion/MemRefToSPIRV/memref-to-spirv.mlir b/mlir/test/Conversion/MemRefToSPIRV/memref-to-spirv.mlir
index d0ddac8cd801c..7c765f70136bb 100644
--- a/mlir/test/Conversion/MemRefToSPIRV/memref-to-spirv.mlir
+++ b/mlir/test/Conversion/MemRefToSPIRV/memref-to-spirv.mlir
@@ -85,6 +85,51 @@ func.func @load_i1(%src: memref<4xi1, #spirv.storage_class<StorageBuffer>>, %i :
   return %0: i1
 }
 
+// CHECK-LABEL: func @load_aligned
+//  CHECK-SAME: (%[[SRC:.+]]: memref<4xi1, #spirv.storage_class<StorageBuffer>>, %[[IDX:.+]]: index)
+func.func @load_aligned(%src: memref<4xi1, #spirv.storage_class<StorageBuffer>>, %i : index) -> i1 {
+  // CHECK-DAG: %[[SRC_CAST:.+]] = builtin.unrealized_conversion_cast %[[SRC]] : memref<4xi1, #spirv.storage_class<StorageBuffer>> to !spirv.ptr<!spirv.struct<(!spirv.array<4 x i8, stride=1> [0])>, StorageBuffer>
+  // CHECK-DAG: %[[IDX_CAST:.+]] = builtin.unrealized_conversion_cast %[[IDX]]
+  // CHECK: %[[ZERO:.*]] = spirv.Constant 0 : i32
+  // CHECK: %[[ADDR:.+]] = spirv.AccessChain %[[SRC_CAST]][%[[ZERO]], %[[IDX_CAST]]]
+  // CHECK: %[[VAL:.+]] = spirv.Load "StorageBuffer" %[[ADDR]] ["Aligned", 32] : i8
+  // CHECK: %[[ZERO_I8:.+]] = spirv.Constant 0 : i8
+  // CHECK: %[[BOOL:.+]] = spirv.INotEqual %[[VAL]], %[[ZERO_I8]] : i8
+  %0 = memref.load %src[%i] { alignment = 32 } : memref<4xi1, #spirv.storage_class<StorageBuffer>>
+  // CHECK: return %[[BOOL]]
+  return %0: i1
+}
+
+// CHECK-LABEL: func @load_aligned_nontemporal
+//  CHECK-SAME: (%[[SRC:.+]]: memref<4xi1, #spirv.storage_class<StorageBuffer>>, %[[IDX:.+]]: index)
+func.func @load_aligned_nontemporal(%src: memref<4xi1, #spirv.storage_class<StorageBuffer>>, %i : index) -> i1 {
+  // CHECK-DAG: %[[SRC_CAST:.+]] = builtin.unrealized_conversion_cast %[[SRC]] : memref<4xi1, #spirv.storage_class<StorageBuffer>> to !spirv.ptr<!spirv.struct<(!spirv.array<4 x i8, stride=1> [0])>, StorageBuffer>
+  // CHECK-DAG: %[[IDX_CAST:.+]] = builtin.unrealized_conversion_cast %[[IDX]]
+  // CHECK: %[[ZERO:.*]] = spirv.Constant 0 : i32
+  // CHECK: %[[ADDR:.+]] = spirv.AccessChain %[[SRC_CAST]][%[[ZERO]], %[[IDX_CAST]]]
+  // CHECK: %[[VAL:.+]] = spirv.Load "StorageBuffer" %[[ADDR]] ["Aligned|Nontemporal", 32] : i8
+  // CHECK: %[[ZERO_I8:.+]] = spirv.Constant 0 : i8
+  // CHECK: %[[BOOL:.+]] = spirv.INotEqual %[[VAL]], %[[ZERO_I8]] : i8
+  %0 = memref.load %src[%i] { alignment = 32, nontemporal = true } : memref<4xi1, #spirv.storage_class<StorageBuffer>>
+  // CHECK: return %[[BOOL]]
+  return %0: i1
+}
+
+// CHECK-LABEL: func @load_aligned_psb
+//  CHECK-SAME: (%[[SRC:.+]]: memref<4xi1, #spirv.storage_class<PhysicalStorageBuffer>>, %[[IDX:.+]]: index)
+func.func @load_aligned_psb(%src: memref<4xi1, #spirv.storage_class<PhysicalStorageBuffer>>, %i : index) -> i1 {
+  // CHECK-DAG: %[[SRC_CAST:.+]] = builtin.unrealized_conversion_cast %[[SRC]] : memref<4xi1, #spirv.storage_class<PhysicalStorageBuffer>> to !spirv.ptr<!spirv.struct<(!spirv.array<4 x i8, stride=1> [0])>, PhysicalStorageBuffer>
+  // CHECK-DAG: %[[IDX_CAST:.+]] = builtin.unrealized_conversion_cast %[[IDX]]
+  // CHECK: %[[ZERO:.*]] = spirv.Constant 0 : i32
+  // CHECK: %[[ADDR:.+]] = spirv.AccessChain %[[SRC_CAST]][%[[ZERO]], %[[IDX_CAST]]]
+  // CHECK: %[[VAL:.+]] = spirv.Load "PhysicalStorageBuffer" %[[ADDR]] ["Aligned", 32] : i8
+  // CHECK: %[[ZERO_I8:.+]] = spirv.Constant 0 : i8
+  // CHECK: %[[BOOL:.+]] = spirv.INotEqual %[[VAL]], %[[ZERO_I8]] : i8
+  %0 = memref.load %src[%i] { alignment = 32 } : memref<4xi1, #spirv.storage_class<PhysicalStorageBuffer>>
+  // CHECK: return %[[BOOL]]
+  return %0: i1
+}
+
 // CHECK-LABEL: func @store_i1
 //  CHECK-SAME: %[[DST:.+]]: memref<4xi1, #spirv.storage_class<StorageBuffer>>,
 //  CHECK-SAME: %[[IDX:.+]]: index

llvmbot · 2025-08-01T19:39:02Z

@llvm/pr-subscribers-mlir-spirv

Author: Erick Ochoa Lopez (amd-eochoalo)

Changes

Propagating alignment attributes from memref operations into the SPIR-V dialect.

Full diff: https://github.com/llvm/llvm-project/pull/151723.diff

2 Files Affected:

(modified) mlir/lib/Conversion/MemRefToSPIRV/MemRefToSPIRV.cpp (+17-12)
(modified) mlir/test/Conversion/MemRefToSPIRV/memref-to-spirv.mlir (+45)

diff --git a/mlir/lib/Conversion/MemRefToSPIRV/MemRefToSPIRV.cpp b/mlir/lib/Conversion/MemRefToSPIRV/MemRefToSPIRV.cpp
index 7a705336bf11c..e730998f153b0 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"
@@ -465,7 +466,13 @@ 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 (std::numeric_limits<uint32_t>::max() < preferredAlignment) {
+    return failure();
+  }
+
   MLIRContext *ctx = accessedPtr.getContext();
 
   auto memoryAccess = spirv::MemoryAccess::None;
@@ -474,7 +481,10 @@ 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{}};
     }
@@ -483,6 +493,7 @@ 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();
@@ -494,7 +505,8 @@ 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};
 }
 
@@ -508,16 +520,9 @@ 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
diff --git a/mlir/test/Conversion/MemRefToSPIRV/memref-to-spirv.mlir b/mlir/test/Conversion/MemRefToSPIRV/memref-to-spirv.mlir
index d0ddac8cd801c..7c765f70136bb 100644
--- a/mlir/test/Conversion/MemRefToSPIRV/memref-to-spirv.mlir
+++ b/mlir/test/Conversion/MemRefToSPIRV/memref-to-spirv.mlir
@@ -85,6 +85,51 @@ func.func @load_i1(%src: memref<4xi1, #spirv.storage_class<StorageBuffer>>, %i :
   return %0: i1
 }
 
+// CHECK-LABEL: func @load_aligned
+//  CHECK-SAME: (%[[SRC:.+]]: memref<4xi1, #spirv.storage_class<StorageBuffer>>, %[[IDX:.+]]: index)
+func.func @load_aligned(%src: memref<4xi1, #spirv.storage_class<StorageBuffer>>, %i : index) -> i1 {
+  // CHECK-DAG: %[[SRC_CAST:.+]] = builtin.unrealized_conversion_cast %[[SRC]] : memref<4xi1, #spirv.storage_class<StorageBuffer>> to !spirv.ptr<!spirv.struct<(!spirv.array<4 x i8, stride=1> [0])>, StorageBuffer>
+  // CHECK-DAG: %[[IDX_CAST:.+]] = builtin.unrealized_conversion_cast %[[IDX]]
+  // CHECK: %[[ZERO:.*]] = spirv.Constant 0 : i32
+  // CHECK: %[[ADDR:.+]] = spirv.AccessChain %[[SRC_CAST]][%[[ZERO]], %[[IDX_CAST]]]
+  // CHECK: %[[VAL:.+]] = spirv.Load "StorageBuffer" %[[ADDR]] ["Aligned", 32] : i8
+  // CHECK: %[[ZERO_I8:.+]] = spirv.Constant 0 : i8
+  // CHECK: %[[BOOL:.+]] = spirv.INotEqual %[[VAL]], %[[ZERO_I8]] : i8
+  %0 = memref.load %src[%i] { alignment = 32 } : memref<4xi1, #spirv.storage_class<StorageBuffer>>
+  // CHECK: return %[[BOOL]]
+  return %0: i1
+}
+
+// CHECK-LABEL: func @load_aligned_nontemporal
+//  CHECK-SAME: (%[[SRC:.+]]: memref<4xi1, #spirv.storage_class<StorageBuffer>>, %[[IDX:.+]]: index)
+func.func @load_aligned_nontemporal(%src: memref<4xi1, #spirv.storage_class<StorageBuffer>>, %i : index) -> i1 {
+  // CHECK-DAG: %[[SRC_CAST:.+]] = builtin.unrealized_conversion_cast %[[SRC]] : memref<4xi1, #spirv.storage_class<StorageBuffer>> to !spirv.ptr<!spirv.struct<(!spirv.array<4 x i8, stride=1> [0])>, StorageBuffer>
+  // CHECK-DAG: %[[IDX_CAST:.+]] = builtin.unrealized_conversion_cast %[[IDX]]
+  // CHECK: %[[ZERO:.*]] = spirv.Constant 0 : i32
+  // CHECK: %[[ADDR:.+]] = spirv.AccessChain %[[SRC_CAST]][%[[ZERO]], %[[IDX_CAST]]]
+  // CHECK: %[[VAL:.+]] = spirv.Load "StorageBuffer" %[[ADDR]] ["Aligned|Nontemporal", 32] : i8
+  // CHECK: %[[ZERO_I8:.+]] = spirv.Constant 0 : i8
+  // CHECK: %[[BOOL:.+]] = spirv.INotEqual %[[VAL]], %[[ZERO_I8]] : i8
+  %0 = memref.load %src[%i] { alignment = 32, nontemporal = true } : memref<4xi1, #spirv.storage_class<StorageBuffer>>
+  // CHECK: return %[[BOOL]]
+  return %0: i1
+}
+
+// CHECK-LABEL: func @load_aligned_psb
+//  CHECK-SAME: (%[[SRC:.+]]: memref<4xi1, #spirv.storage_class<PhysicalStorageBuffer>>, %[[IDX:.+]]: index)
+func.func @load_aligned_psb(%src: memref<4xi1, #spirv.storage_class<PhysicalStorageBuffer>>, %i : index) -> i1 {
+  // CHECK-DAG: %[[SRC_CAST:.+]] = builtin.unrealized_conversion_cast %[[SRC]] : memref<4xi1, #spirv.storage_class<PhysicalStorageBuffer>> to !spirv.ptr<!spirv.struct<(!spirv.array<4 x i8, stride=1> [0])>, PhysicalStorageBuffer>
+  // CHECK-DAG: %[[IDX_CAST:.+]] = builtin.unrealized_conversion_cast %[[IDX]]
+  // CHECK: %[[ZERO:.*]] = spirv.Constant 0 : i32
+  // CHECK: %[[ADDR:.+]] = spirv.AccessChain %[[SRC_CAST]][%[[ZERO]], %[[IDX_CAST]]]
+  // CHECK: %[[VAL:.+]] = spirv.Load "PhysicalStorageBuffer" %[[ADDR]] ["Aligned", 32] : i8
+  // CHECK: %[[ZERO_I8:.+]] = spirv.Constant 0 : i8
+  // CHECK: %[[BOOL:.+]] = spirv.INotEqual %[[VAL]], %[[ZERO_I8]] : i8
+  %0 = memref.load %src[%i] { alignment = 32 } : memref<4xi1, #spirv.storage_class<PhysicalStorageBuffer>>
+  // CHECK: return %[[BOOL]]
+  return %0: i1
+}
+
 // CHECK-LABEL: func @store_i1
 //  CHECK-SAME: %[[DST:.+]]: memref<4xi1, #spirv.storage_class<StorageBuffer>>,
 //  CHECK-SAME: %[[IDX:.+]]: index

mlir/lib/Conversion/MemRefToSPIRV/MemRefToSPIRV.cpp

mlir/test/Conversion/MemRefToSPIRV/memref-to-spirv.mlir

github-actions · 2025-08-07T16:18:43Z

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amd-eochoalo added 2 commits August 1, 2025 11:51

[mlir] Use memref's alignment attribute directly.

f4664aa

[mlir] MemRefToSPIRV propagate alignment attribute.

1c3455c

kuhar reviewed Aug 1, 2025

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mlir/test/Conversion/MemRefToSPIRV/memref-to-spirv.mlir Show resolved Hide resolved

amd-eochoalo added 2 commits August 1, 2025 15:32

[mlir] Ensure memref's alignment is within SPIRV's alignment bounds.

04a811b

[mlir] Add aligned nontemporal load test to MemRefToSPIRV.

0337e22

amd-eochoalo marked this pull request as ready for review August 1, 2025 19:38

amd-eochoalo requested a review from antiagainst as a code owner August 1, 2025 19:38

llvmbot added mlir:spirv mlir labels Aug 1, 2025

kuhar requested review from krzysz00 and Hardcode84 August 7, 2025 15:18

kuhar reviewed Aug 7, 2025

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kuhar approved these changes Aug 7, 2025

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kuhar merged commit 6d231fb into llvm:main Aug 7, 2025
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