Fixups

mlir/include/mlir/Dialect/Vector/Transforms/VectorTransforms.h

@@ -116,7 +116,7 @@ castAwayContractionLeadingOneDim(vector::ContractionOp contractOp,
                                  MaskingOpInterface maskingOp,
                                  RewriterBase &rewriter);
 
-/// Structure to hold the range [vscaleMin, vscaleMax] `vector.vscale` can take.
+// Structure to hold the range of `vector.vscale`.
 struct VscaleRange {
   unsigned vscaleMin;
   unsigned vscaleMax;

mlir/lib/Dialect/Vector/Transforms/VectorMaskElimination.cpp

@@ -1,3 +1,11 @@
+//===- VectorMaskElimination.cpp - Eliminate Vector Masks -----------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
 #include "mlir/Dialect/Arith/IR/Arith.h"
 #include "mlir/Dialect/Utils/StaticValueUtils.h"
 #include "mlir/Dialect/Vector/IR/ScalableValueBoundsConstraintSet.h"
@@ -105,10 +113,14 @@ void eliminateVectorMasks(IRRewriter &rewriter, FunctionOpInterface function,
     return;
 
   OpBuilder::InsertionGuard g(rewriter);
+
+  // Build worklist so we can safely insert new ops in
+  // `resolveAllTrueCreateMaskOp()`.
   SmallVector<vector::CreateMaskOp> worklist;
   function.walk([&](vector::CreateMaskOp createMaskOp) {
     worklist.push_back(createMaskOp);
   });
+
   rewriter.setInsertionPointToStart(&function.front());
   for (auto mask : worklist)
     (void)resolveAllTrueCreateMaskOp(rewriter, mask, *vscaleRange);

mlir/test/Dialect/Vector/eliminate-masks.mlir

@@ -16,7 +16,7 @@ func.func @eliminate_redundant_masks_through_insert_and_extracts(%tensor: tensor
   %extracted_slice_0 = tensor.extract_slice %tensor[0, 0] [1, %c4_vscale] [1, 1] : tensor<1x1000xf32> to tensor<1x?xf32>
   %output_tensor = scf.for %i = %c0 to %c1000 step %c4_vscale iter_args(%arg = %extracted_slice_0) -> tensor<1x?xf32> {
     // 1. Extract a slice.
-    %extracted_slice_1 = tensor.extract_slice %arg[0, 0] [1, %c4_vscale] [1, 1] : tensor<1x?xf32> to tensor<?xf32>
+    %extracted_slice_1 = tensor.extract_slice %arg[0, %i] [1, %c4_vscale] [1, 1] : tensor<1x?xf32> to tensor<?xf32>
 
     // 2. Create a mask for the slice.
     %dim_1 = tensor.dim %extracted_slice_1, %c0 : tensor<?xf32>
@@ -57,8 +57,8 @@ func.func @negative_extract_slice_size_shrink(%tensor: tensor<1000xf32>) {
     %mask = vector.create_mask %dim : vector<[4]xi1>
     "test.some_use"(%mask) : (vector<[4]xi1>) -> ()
     // !!! Here the size of the mask could shrink in the next iteration.
-    %next_num_els = affine.min  affine_map<(d0)[s0] -> (-d0 + 1000, s0)>(%i)[%c4_vscale]
-    %new_extracted_slice = tensor.extract_slice %tensor[%c4_vscale] [%next_num_els] [1] : tensor<1000xf32> to tensor<?xf32>
+    %next_num_elts = affine.min  affine_map<(d0)[s0] -> (-d0 + 1000, s0)>(%i)[%c4_vscale]
+    %new_extracted_slice = tensor.extract_slice %tensor[%c4_vscale] [%next_num_elts] [1] : tensor<1000xf32> to tensor<?xf32>
     scf.yield %new_extracted_slice : tensor<?xf32>
   }
   "test.some_use"(%slice) : (tensor<?xf32>) -> ()
@@ -110,8 +110,8 @@ func.func @negative_value_bounds_fixed_dim_not_all_true(%tensor: tensor<2x?xf32>
   %c4 = arith.constant 4 : index
   %vscale = vector.vscale
   %c4_vscale = arith.muli %vscale, %c4 : index
-  // This is _very_ simple but since addi is not a constant value bounds will
-  // be used to resolve it.
+  // This is _very_ simple but since tensor.dim is not a constant value bounds
+  // will be used to resolve it.
   %dim = tensor.dim %tensor, %c0 : tensor<2x?xf32>
   %mask = vector.create_mask %dim, %c4_vscale : vector<3x[4]xi1>
   "test.some_use"(%mask) : (vector<3x[4]xi1>) -> ()

mlir/test/lib/Dialect/Vector/TestVectorTransforms.cpp

@@ -885,15 +885,10 @@ struct TestEliminateVectorMasks
       : PassWrapper(pass) {}
 
   Option<unsigned> vscaleMin{
-      *this, "vscale-min",
-      llvm::cl::desc(
-          "Minimum value `vector.vscale` can possibly be at runtime."),
+      *this, "vscale-min", llvm::cl::desc("Minimum possible value of vscale."),
       llvm::cl::init(1)};
-
   Option<unsigned> vscaleMax{
-      *this, "vscale-max",
-      llvm::cl::desc(
-          "Maximum value `vector.vscale` can possibly be at runtime."),
+      *this, "vscale-max", llvm::cl::desc("Maximum possible value of vscale."),
       llvm::cl::init(16)};
 
   StringRef getArgument() const final { return "test-eliminate-vector-masks"; }