[MLIR][Affine] Fix affine.parallel op domain add

Fix obvious bug in `addAffineParallelOpDomain` that would lead to
incorrect domain constraints for any affine.parallel op with
dimensionality greater than one.

Reviewed By: springerm

Differential Revision: https://reviews.llvm.org/D144349

mlir/lib/Dialect/Affine/Analysis/AffineStructures.cpp

@@ -648,7 +648,7 @@ FlatAffineValueConstraints::addAffineForOpDomain(AffineForOp forOp) {
 LogicalResult FlatAffineValueConstraints::addAffineParallelOpDomain(
     AffineParallelOp parallelOp) {
   size_t ivPos = 0;
-  for (auto iv : parallelOp.getIVs()) {
+  for (Value iv : parallelOp.getIVs()) {
     unsigned pos;
     if (!findVar(iv, &pos)) {
       assert(false && "variable expected for the IV value");
@@ -668,6 +668,7 @@ LogicalResult FlatAffineValueConstraints::addAffineParallelOpDomain(
     else if (failed(addBound(BoundType::UB, pos, upperBound,
                              parallelOp.getUpperBoundsOperands())))
       return failure();
+    ++ivPos;
   }
   return success();
 }

mlir/test/Transforms/memref-dependence-check.mlir

@@ -1102,3 +1102,31 @@ func.func @affine_if_no_dependence() {
   }
   return
 }
+
+// -----
+
+// CHECK-LABEL: func @affine_parallel_dep_check
+func.func @affine_parallel_dep_check() {
+  %memref_23 = memref.alloc() : memref<1x130xf32>
+  %memref_25 = memref.alloc() : memref<1x130x130xf32>
+  %cst = arith.constant 0.0 : f32
+  affine.parallel (%arg4, %arg5) = (0, 0) to (1, 130) {
+    affine.store %cst, %memref_25[%arg4, %arg5, 129] : memref<1x130x130xf32>
+    // expected-remark@above {{dependence from 0 to 0 at depth 1 = false}}
+    // expected-remark@above {{dependence from 0 to 0 at depth 2 = false}}
+    // expected-remark@above {{dependence from 0 to 0 at depth 3 = false}}
+    // expected-remark@above {{dependence from 0 to 1 at depth 1 = true}}
+  }
+  %memref_27 = memref.alloc() : memref<1x128x128xf32>
+  affine.parallel (%arg4) = (0) to (130) {
+    affine.parallel (%arg5, %arg6) = (0, 0) to (1, 130) {
+      affine.load %memref_25[0, %arg4 + %arg5, %arg6] : memref<1x130x130xf32>
+      // expected-remark@above {{dependence from 1 to 1 at depth 1 = false}}
+      // expected-remark@above {{dependence from 1 to 1 at depth 2 = false}}
+      // expected-remark@above {{dependence from 1 to 1 at depth 3 = false}}
+      // expected-remark@above {{dependence from 1 to 1 at depth 4 = false}}
+      // expected-remark@above {{dependence from 1 to 0 at depth 1 = false}}
+    }
+  }
+  return
+}