[MLIR][Vector] Refactor tests for contract -> OP transforms (4/N) (#73807)

This patch refactors tests for:

    vector.contract -> vector.outerproduct

for matvec operations (b += Ax). Summary of changes:
  * add 2 missing cases (masked + scalable) when the operation kind is
    `maxf`.

This is a part of a larger effort to add cases with scalable vectors to
tests for the Vector dialect.

Implements #72834.

Author: banach-space

mlir/test/Dialect/Vector/vector-contract-to-outerproduct-matvec-transforms.mlir

@@ -186,6 +186,52 @@ func.func @matvec_mk_k_m_max(%A: vector<2x2xf32>,
   return %0 : vector<2xf32>
 }
 
+// CHECK-LABEL:   func.func @masked_matvec_mk_k_m_max(
+// CHECK-SAME:      %{{.*}}: vector<2x3xf32>,
+// CHECK-SAME:      %{{.*}}: vector<3xf32>,
+// CHECK-SAME:      %{{.*}}: vector<2xf32>,
+// CHECK-SAME:      %[[IN_MASK:.*]]: vector<2x3xi1>) -> vector<2xf32>
+// CHECK:           %[[T_MASK:.*]] = vector.transpose %[[IN_MASK]], [1, 0] : vector<2x3xi1> to vector<3x2xi1>
+// CHECK:           %[[MASK0:.*]] = vector.extract %[[T_MASK]][0] : vector<2xi1> from vector<3x2xi1>
+// CHECK:           vector.mask %[[MASK0]] { vector.outerproduct {{.*}} {kind = #vector.kind<maxf>} : vector<2xf32>, f32 } : vector<2xi1> -> vector<2xf32>
+
+// CHECK:           %[[MASK1:.*]] = vector.extract %[[T_MASK]][1] : vector<2xi1> from vector<3x2xi1>
+// CHECK:           vector.mask %[[MASK1]] { vector.outerproduct {{.*}} {kind = #vector.kind<maxf>} : vector<2xf32>, f32 } : vector<2xi1> -> vector<2xf32>
+
+// CHECK:           %[[MASK2:.*]] = vector.extract %[[T_MASK]][2] : vector<2xi1> from vector<3x2xi1>
+// CHECK:           vector.mask %[[MASK2]] { vector.outerproduct {{.*}} {kind = #vector.kind<maxf>} : vector<2xf32>, f32 } : vector<2xi1> -> vector<2xf32>
+func.func @masked_matvec_mk_k_m_max(%A: vector<2x3xf32>,
+                                    %x: vector<3xf32>,
+                                    %b: vector<2xf32>,
+                                    %m: vector<2x3xi1>) -> vector<2xf32> {
+  %0 = vector.mask %m { vector.contract #matvecmax_trait %A, %x, %b
+          : vector<2x3xf32>, vector<3xf32> into vector<2xf32> } : vector<2x3xi1> -> vector<2xf32>
+  return %0 : vector<2xf32>
+}
+
+// CHECK-LABEL:   func.func @masked_matvec_mk_k_m_max_scalable_parallel_dim(
+// CHECK-SAME:      %{{.*}}: vector<[2]x3xf32>,
+// CHECK-SAME:      %{{.*}}: vector<3xf32>,
+// CHECK-SAME:      %{{.*}}: vector<[2]xf32>,
+// CHECK-SAME:      %[[IN_MASK:.*]]: vector<[2]x3xi1>) -> vector<[2]xf32>
+// CHECK:           %[[T_MASK:.*]] = vector.transpose %[[IN_MASK]], [1, 0] : vector<[2]x3xi1> to vector<3x[2]xi1>
+// CHECK:           %[[MASK0:.*]] = vector.extract %[[T_MASK]][0] : vector<[2]xi1> from vector<3x[2]xi1>
+// CHECK:           vector.mask %[[MASK0]] { vector.outerproduct {{.*}} {kind = #vector.kind<maxf>} : vector<[2]xf32>, f32 } : vector<[2]xi1> -> vector<[2]xf32>
+
+// CHECK:           %[[MASK1:.*]] = vector.extract %[[T_MASK]][1] : vector<[2]xi1> from vector<3x[2]xi1>
+// CHECK:           vector.mask %[[MASK1]] { vector.outerproduct {{.*}} {kind = #vector.kind<maxf>} : vector<[2]xf32>, f32 } : vector<[2]xi1> -> vector<[2]xf32>
+
+// CHECK:           %[[MASK2:.*]] = vector.extract %[[T_MASK]][2] : vector<[2]xi1> from vector<3x[2]xi1>
+// CHECK:           vector.mask %[[MASK2]] { vector.outerproduct {{.*}} {kind = #vector.kind<maxf>} : vector<[2]xf32>, f32 } : vector<[2]xi1> -> vector<[2]xf32>
+func.func @masked_matvec_mk_k_m_max_scalable_parallel_dim(%A: vector<[2]x3xf32>,
+                                                          %x: vector<3xf32>,
+                                                          %b: vector<[2]xf32>,
+                                                          %m: vector<[2]x3xi1>) -> vector<[2]xf32> {
+  %0 = vector.mask %m { vector.contract #matvecmax_trait %A, %x, %b
+          : vector<[2]x3xf32>, vector<3xf32> into vector<[2]xf32> } : vector<[2]x3xi1> -> vector<[2]xf32>
+  return %0 : vector<[2]xf32>
+}
+
 // ============================================================================
 //  Matvec 2 (plain + masked + scalable)
 // ============================================================================