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[mlir][affine] Add folders for delinearize_index and linearize_index
This commit adds implementations of fold() for delinearize_index and linearize_index to constant-fold them away when they have a fully constant basis and constant argument(s). This commit also adds a canonicalization pattern to linearize_index that causes it to drop leading-zero inputs.
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‎mlir/include/mlir/Dialect/Affine/IR/AffineOps.td‎

Lines changed: 2 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -1110,6 +1110,7 @@ def AffineDelinearizeIndexOp : Affine_Op<"delinearize_index",
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}];
11111111

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let hasVerifier = 1;
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let hasFolder = 1;
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let hasCanonicalizer = 1;
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}
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@@ -1179,6 +1180,7 @@ def AffineLinearizeIndexOp : Affine_Op<"linearize_index",
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}];
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let hasVerifier = 1;
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let hasFolder = 1;
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let hasCanonicalizer = 1;
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}
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‎mlir/lib/Dialect/Affine/IR/AffineOps.cpp‎

Lines changed: 69 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -4556,6 +4556,26 @@ LogicalResult AffineDelinearizeIndexOp::verify() {
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return success();
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}
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LogicalResult
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AffineDelinearizeIndexOp::fold(FoldAdaptor adaptor,
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SmallVectorImpl<OpFoldResult> &result) {
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if (adaptor.getLinearIndex() == nullptr)
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return failure();
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if (!adaptor.getDynamicBasis().empty())
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return failure();
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int64_t highPart = cast<IntegerAttr>(adaptor.getLinearIndex()).getInt();
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Type attrType = getLinearIndex().getType();
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for (int64_t modulus : llvm::reverse(getStaticBasis().drop_front())) {
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result.push_back(IntegerAttr::get(attrType, llvm::mod(highPart, modulus)));
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highPart = llvm::divideFloorSigned(highPart, modulus);
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}
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result.push_back(IntegerAttr::get(attrType, highPart));
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std::reverse(result.begin(), result.end());
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return success();
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}
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namespace {
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// Drops delinearization indices that correspond to unit-extent basis
@@ -4715,6 +4735,26 @@ LogicalResult AffineLinearizeIndexOp::verify() {
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return success();
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}
47174737

4738+
OpFoldResult AffineLinearizeIndexOp::fold(FoldAdaptor adaptor) {
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if (llvm::any_of(adaptor.getMultiIndex(),
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[](Attribute a) { return a == nullptr; }))
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return nullptr;
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if (!adaptor.getDynamicBasis().empty())
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return nullptr;
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int64_t result = 0;
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int64_t stride = 1;
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for (auto [indexAttr, length] :
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llvm::zip_equal(llvm::reverse(adaptor.getMultiIndex()),
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llvm::reverse(getStaticBasis()))) {
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result = result + cast<IntegerAttr>(indexAttr).getInt() * stride;
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stride = stride * length;
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}
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return IntegerAttr::get(getResult().getType(), result);
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}
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namespace {
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/// Rewrite `affine.linearize_index disjoint [%...a, %x, %...b] by (%...c, 1,
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/// %...d)` to `affine.linearize_index disjoint [%...a, %...b] by (%...c,
@@ -4820,11 +4860,39 @@ struct CancelLinearizeOfDelinearizeExact final
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return success();
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}
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};
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/// Strip leading zero from affine.linearize_index.
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///
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/// `affine.linearize_index [%c0, ...a] by (%x, ...b)` can be rewritten
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/// to `affine.linearize_index [...a] by (...b)` in all cases.
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struct DropLinearizeLeadingZero final
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: OpRewritePattern<affine::AffineLinearizeIndexOp> {
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using OpRewritePattern::OpRewritePattern;
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LogicalResult matchAndRewrite(affine::AffineLinearizeIndexOp op,
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PatternRewriter &rewriter) const override {
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Value leadingIdx = op.getMultiIndex().front();
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if (!matchPattern(leadingIdx, m_Zero()))
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return failure();
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if (op.getMultiIndex().size() == 1) {
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rewriter.replaceOp(op, leadingIdx);
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return success();
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}
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SmallVector<OpFoldResult> mixedBasis = op.getMixedBasis();
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rewriter.replaceOpWithNewOp<affine::AffineLinearizeIndexOp>(
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op, op.getMultiIndex().drop_front(),
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ArrayRef<OpFoldResult>(mixedBasis).drop_front(), op.getDisjoint());
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return success();
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}
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};
48234890
} // namespace
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void affine::AffineLinearizeIndexOp::getCanonicalizationPatterns(
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RewritePatternSet &patterns, MLIRContext *context) {
4827-
patterns.add<CancelLinearizeOfDelinearizeExact, DropLinearizeOneBasisElement,
4894+
patterns.add<CancelLinearizeOfDelinearizeExact, DropLinearizeLeadingZero,
4895+
DropLinearizeOneBasisElement,
48284896
DropLinearizeUnitComponentsIfDisjointOrZero>(context);
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}
48304898

‎mlir/test/Dialect/Affine/canonicalize.mlir‎

Lines changed: 80 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -1469,6 +1469,45 @@ func.func @prefetch_canonicalize(%arg0: memref<512xf32>) -> () {
14691469

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// -----
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// CHECK-LABEL: @delinearize_fold_constant
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// CHECK-DAG: %[[C1:.+]] = arith.constant 1 : index
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// CHECK-DAG: %[[C2:.+]] = arith.constant 2 : index
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// CHECK-NOT: affine.delinearize_index
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// CHECK: return %[[C1]], %[[C1]], %[[C2]]
1477+
func.func @delinearize_fold_constant() -> (index, index, index) {
1478+
%c22 = arith.constant 22 : index
1479+
%0:3 = affine.delinearize_index %c22 into (2, 3, 5) : index, index, index
1480+
return %0#0, %0#1, %0#2 : index, index, index
1481+
}
1482+
1483+
// -----
1484+
1485+
// CHECK-LABEL: @delinearize_fold_negative_constant
1486+
// CHECK-DAG: %[[C_2:.+]] = arith.constant -2 : index
1487+
// CHECK-DAG: %[[C1:.+]] = arith.constant 1 : index
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// CHECK-DAG: %[[C3:.+]] = arith.constant 3 : index
1489+
// CHECK-NOT: affine.delinearize_index
1490+
// CHECK: return %[[C_2]], %[[C1]], %[[C3]]
1491+
func.func @delinearize_fold_negative_constant() -> (index, index, index) {
1492+
%c_22 = arith.constant -22 : index
1493+
%0:3 = affine.delinearize_index %c_22 into (2, 3, 5) : index, index, index
1494+
return %0#0, %0#1, %0#2 : index, index, index
1495+
}
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// -----
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// CHECK-LABEL: @delinearize_dont_fold_constant_dynamic_basis
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// CHECK-DAG: %[[C22:.+]] = arith.constant 22 : index
1501+
// CHECK: %[[RET:.+]]:3 = affine.delinearize_index %[[C22]]
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// CHECK: return %[[RET]]#0, %[[RET]]#1, %[[RET]]#2
1503+
func.func @delinearize_dont_fold_constant_dynamic_basis(%arg0: index) -> (index, index, index) {
1504+
%c22 = arith.constant 22 : index
1505+
%0:3 = affine.delinearize_index %c22 into (2, %arg0, 5) : index, index, index
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return %0#0, %0#1, %0#2 : index, index, index
1507+
}
1508+
1509+
// -----
1510+
14721511
func.func @drop_unit_basis_in_delinearize(%arg0 : index, %arg1 : index, %arg2 : index) ->
14731512
(index, index, index, index, index, index) {
14741513
%c1 = arith.constant 1 : index
@@ -1535,6 +1574,33 @@ func.func @delinearize_non_loop_like(%arg0: memref<?xi32>, %i : index) -> index
15351574

15361575
// -----
15371576

1577+
// CHECK-LABEL: @linearize_fold_constants
1578+
// CHECK-DAG: %[[C22:.+]] = arith.constant 22 : index
1579+
// CHECK-NOT: affine.linearize
1580+
// CHECK: return %[[C22]]
1581+
func.func @linearize_fold_constants() -> index {
1582+
%c2 = arith.constant 2 : index
1583+
%c1 = arith.constant 1 : index
1584+
1585+
%ret = affine.linearize_index [%c1, %c1, %c2] by (2, 3, 5) : index
1586+
return %ret : index
1587+
}
1588+
1589+
// -----
1590+
1591+
// CHECK-LABEL: @linearize_dont_fold_dynamic_basis
1592+
// CHECK: %[[RET:.+]] = affine.linearize_index
1593+
// CHECK: return %[[RET]]
1594+
func.func @linearize_dont_fold_dynamic_basis(%arg0: index) -> index {
1595+
%c2 = arith.constant 2 : index
1596+
%c1 = arith.constant 1 : index
1597+
1598+
%ret = affine.linearize_index [%c1, %c1, %c2] by (2, %arg0, 5) : index
1599+
return %ret : index
1600+
}
1601+
1602+
// -----
1603+
15381604
// CHECK-LABEL: func @cancel_delinearize_linearize_disjoint_exact(
15391605
// CHECK-SAME: %[[ARG0:[a-zA-Z0-9]+]]: index,
15401606
// CHECK-SAME: %[[ARG1:[a-zA-Z0-9]+]]: index,
@@ -1676,3 +1742,17 @@ func.func @no_cancel_linearize_denearize_different_basis(%arg0: index, %arg1: in
16761742
%1 = affine.linearize_index [%0#0, %0#1, %0#2] by (%arg1, 8, %arg2) : index
16771743
return %1 : index
16781744
}
1745+
1746+
// -----
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1748+
// CHECK-LABEL: func @affine_leading_zero(
1749+
// CHECK-SAME: %[[ARG0:[a-zA-Z0-9]+]]: index,
1750+
// CHECK-SAME: %[[ARG1:[a-zA-Z0-9]+]]: index)
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// CHECK: %[[RET:.+]] = affine.linearize_index [%[[ARG0]], %[[ARG1]]] by (3, 5)
1752+
// CHECK: return %[[RET]]
1753+
func.func @affine_leading_zero(%arg0: index, %arg1: index) -> index {
1754+
%c0 = arith.constant 0 : index
1755+
%ret = affine.linearize_index [%c0, %arg0, %arg1] by (2, 3, 5) : index
1756+
return %ret : index
1757+
}
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