[mlir][vector] Add alignment to vector.gather.

Author: amd-eochoalo

mlir/include/mlir/Dialect/Vector/IR/VectorOps.td

@@ -2003,7 +2003,9 @@ def Vector_GatherOp :
                Variadic<Index>:$indices,
                VectorOfNonZeroRankOf<[AnyInteger, Index]>:$index_vec,
                VectorOfNonZeroRankOf<[I1]>:$mask,
-               AnyVectorOfNonZeroRank:$pass_thru)>,
+               AnyVectorOfNonZeroRank:$pass_thru,
+               ConfinedAttr<OptionalAttr<I64Attr>,
+                   [AllAttrOf<[IntPositive, IntPowerOf2]>]>:$alignment)>,
     Results<(outs AnyVectorOfNonZeroRank:$result)> {
 
   let summary = [{
@@ -2060,6 +2062,31 @@ def Vector_GatherOp :
     "`into` type($result)";
   let hasCanonicalizer = 1;
   let hasVerifier = 1;
+
+  let builders = [
+    OpBuilder<(ins "VectorType":$resultType,
+                   "Value":$base,
+                   "ValueRange":$indices,
+                   "Value":$index_vec,
+                   "Value":$mask,
+                   "Value":$passthrough,
+                   CArg<"llvm::Align", "llvm::Align()">:$alignment), [{
+      return build($_builder, $_state, resultType, base, indices, index_vec, mask, passthrough,
+                   alignment != llvm::Align() ? $_builder.getI64IntegerAttr(alignment.value()) :
+                                    nullptr);
+    }]>,
+    OpBuilder<(ins "TypeRange":$resultTypes,
+                   "Value":$base,
+                   "ValueRange":$indices,
+                   "Value":$index_vec,
+                   "Value":$mask,
+                   "Value":$passthrough,
+                   CArg<"llvm::Align", "llvm::Align()">:$alignment), [{
+      return build($_builder, $_state, resultTypes, base, indices, index_vec, mask, passthrough,
+                   alignment != llvm::Align() ? $_builder.getI64IntegerAttr(alignment.value()) :
+                                    nullptr);
+    }]>
+  ];
 }
 
 def Vector_ScatterOp :

mlir/test/Dialect/Vector/invalid.mlir

@@ -1430,6 +1430,24 @@ func.func @gather_pass_thru_type_mismatch(%base: memref<?xf32>, %indices: vector
 
 // -----
 
+func.func @gather_invalid_alignment(%base: memref<16xf32>, %indices: vector<16xi32>,
+                                %mask: vector<16xi1>, %pass_thru: vector<16xf32>, %c0 : index) {
+  // expected-error@+2 {{'vector.gather' op attribute 'alignment' failed to satisfy constraint: 64-bit signless integer attribute whose value is positive and whose value is a power of two > 0}}
+  %0 = vector.gather %base[%c0][%indices], %mask, %pass_thru
+    { alignment = -1 } : memref<16xf32>, vector<16xi32>, vector<16xi1>, vector<16xf32> into vector<16xf32>
+}
+
+// -----
+
+func.func @gather_invalid_alignment(%base: memref<16xf32>, %indices: vector<16xi32>,
+                                %mask: vector<16xi1>, %pass_thru: vector<16xf32>, %c0 : index) {
+  // expected-error@+2 {{'vector.gather' op attribute 'alignment' failed to satisfy constraint: 64-bit signless integer attribute whose value is positive and whose value is a power of two > 0}}
+  %0 = vector.gather %base[%c0][%indices], %mask, %pass_thru
+    { alignment = 3 } : memref<16xf32>, vector<16xi32>, vector<16xi1>, vector<16xf32> into vector<16xf32>
+}
+
+// -----
+
 func.func @scatter_to_vector(%base: vector<16xf32>, %indices: vector<16xi32>,
                              %mask: vector<16xi1>, %pass_thru: vector<16xf32>) {
   %c0 = arith.constant 0 : index