[llvm-branch-commits] [mlir] [mlir][Transforms] Support 1:N mappings in `ConversionValueMapping` (PR #116524)
Matthias Springer via llvm-branch-commits
llvm-branch-commits at lists.llvm.org
Mon Nov 18 05:57:01 PST 2024
https://github.com/matthias-springer updated https://github.com/llvm/llvm-project/pull/116524
>From e3946a5496cdf64ff6a8a5c7e1b117f4904ac9e5 Mon Sep 17 00:00:00 2001
From: Matthias Springer <mspringer at nvidia.com>
Date: Sun, 17 Nov 2024 04:38:09 +0100
Subject: [PATCH] [mlir][Transforms] Support 1:N mappings in
`ConversionValueMapping`
---
.../Conversion/LLVMCommon/TypeConverter.cpp | 68 ++-
.../Bufferization/Transforms/Bufferize.cpp | 1 -
.../EmitC/Transforms/TypeConversions.cpp | 1 -
.../Dialect/Linalg/Transforms/Detensorize.cpp | 1 -
.../Quant/Transforms/StripFuncQuantTypes.cpp | 1 -
.../Utils/SparseTensorDescriptor.cpp | 3 -
.../Vector/Transforms/VectorLinearize.cpp | 1 -
.../Transforms/Utils/DialectConversion.cpp | 527 ++++++++++--------
mlir/test/Transforms/test-legalizer.mlir | 3 -
.../Func/TestDecomposeCallGraphTypes.cpp | 2 +-
mlir/test/lib/Dialect/Test/TestPatterns.cpp | 11 +-
.../lib/Transforms/TestDialectConversion.cpp | 1 -
12 files changed, 335 insertions(+), 285 deletions(-)
diff --git a/mlir/lib/Conversion/LLVMCommon/TypeConverter.cpp b/mlir/lib/Conversion/LLVMCommon/TypeConverter.cpp
index 59b0f5c9b09bcd..fbf1c20d0baa32 100644
--- a/mlir/lib/Conversion/LLVMCommon/TypeConverter.cpp
+++ b/mlir/lib/Conversion/LLVMCommon/TypeConverter.cpp
@@ -153,20 +153,31 @@ LLVMTypeConverter::LLVMTypeConverter(MLIRContext *ctx,
type.isVarArg());
});
+ // Add generic source and target materializations to handle cases where
+ // non-LLVM types persist after an LLVM conversion.
+ addSourceMaterialization([&](OpBuilder &builder, Type resultType,
+ ValueRange inputs, Location loc) {
+ return builder.create<UnrealizedConversionCastOp>(loc, resultType, inputs)
+ .getResult(0);
+ });
+ addTargetMaterialization([&](OpBuilder &builder, Type resultType,
+ ValueRange inputs, Location loc) {
+ return builder.create<UnrealizedConversionCastOp>(loc, resultType, inputs)
+ .getResult(0);
+ });
+
// Helper function that checks if the given value range is a bare pointer.
auto isBarePointer = [](ValueRange values) {
return values.size() == 1 &&
isa<LLVM::LLVMPointerType>(values.front().getType());
};
- // Argument materializations convert from the new block argument types
- // (multiple SSA values that make up a memref descriptor) back to the
- // original block argument type. The dialect conversion framework will then
- // insert a target materialization from the original block argument type to
- // a legal type.
- addArgumentMaterialization([&](OpBuilder &builder,
- UnrankedMemRefType resultType,
- ValueRange inputs, Location loc) {
+ // Source materializations convert the MemrRef descriptor elements
+ // (multiple SSA values that make up a MemrRef descriptor) back to the
+ // original MemRef type.
+ addSourceMaterialization([&](OpBuilder &builder,
+ UnrankedMemRefType resultType, ValueRange inputs,
+ Location loc) {
// Note: Bare pointers are not supported for unranked memrefs because a
// memref descriptor cannot be built just from a bare pointer.
if (TypeRange(inputs) != getUnrankedMemRefDescriptorFields())
@@ -179,8 +190,8 @@ LLVMTypeConverter::LLVMTypeConverter(MLIRContext *ctx,
return builder.create<UnrealizedConversionCastOp>(loc, resultType, desc)
.getResult(0);
});
- addArgumentMaterialization([&](OpBuilder &builder, MemRefType resultType,
- ValueRange inputs, Location loc) {
+ addSourceMaterialization([&](OpBuilder &builder, MemRefType resultType,
+ ValueRange inputs, Location loc) {
Value desc;
if (isBarePointer(inputs)) {
desc = MemRefDescriptor::fromStaticShape(builder, loc, *this, resultType,
@@ -200,23 +211,30 @@ LLVMTypeConverter::LLVMTypeConverter(MLIRContext *ctx,
return builder.create<UnrealizedConversionCastOp>(loc, resultType, desc)
.getResult(0);
});
- // Add generic source and target materializations to handle cases where
- // non-LLVM types persist after an LLVM conversion.
- addSourceMaterialization([&](OpBuilder &builder, Type resultType,
- ValueRange inputs, Location loc) {
- if (inputs.size() != 1)
- return Value();
+ addTargetMaterialization([&](OpBuilder &builder,
+ LLVM::LLVMStructType resultType,
+ ValueRange inputs, Location loc,
+ Type originalType) -> Value {
+ if (auto memrefType = dyn_cast_or_null<MemRefType>(originalType)) {
+ if (isBarePointer(inputs)) {
+ return MemRefDescriptor::fromStaticShape(builder, loc, *this,
+ memrefType, inputs[0]);
+ } else if (TypeRange(inputs) ==
+ getMemRefDescriptorFields(memrefType,
+ /*unpackAggregates=*/true)) {
+ return MemRefDescriptor::pack(builder, loc, *this, memrefType, inputs);
+ }
+ }
- return builder.create<UnrealizedConversionCastOp>(loc, resultType, inputs)
- .getResult(0);
- });
- addTargetMaterialization([&](OpBuilder &builder, Type resultType,
- ValueRange inputs, Location loc) {
- if (inputs.size() != 1)
- return Value();
+ if (auto memrefType = dyn_cast_or_null<UnrankedMemRefType>(originalType)) {
+ // Note: Bare pointers are not supported for unranked memrefs because a
+ // memref descriptor cannot be built just from a bare pointer.
+ if (TypeRange(inputs) == getUnrankedMemRefDescriptorFields())
+ return UnrankedMemRefDescriptor::pack(builder, loc, *this, memrefType,
+ inputs);
+ }
- return builder.create<UnrealizedConversionCastOp>(loc, resultType, inputs)
- .getResult(0);
+ return Value();
});
// Integer memory spaces map to themselves.
diff --git a/mlir/lib/Dialect/Bufferization/Transforms/Bufferize.cpp b/mlir/lib/Dialect/Bufferization/Transforms/Bufferize.cpp
index 1d009b03754c52..81a11e27c26178 100644
--- a/mlir/lib/Dialect/Bufferization/Transforms/Bufferize.cpp
+++ b/mlir/lib/Dialect/Bufferization/Transforms/Bufferize.cpp
@@ -61,7 +61,6 @@ BufferizeTypeConverter::BufferizeTypeConverter() {
addConversion([](UnrankedTensorType type) -> Type {
return UnrankedMemRefType::get(type.getElementType(), 0);
});
- addArgumentMaterialization(materializeToTensor);
addSourceMaterialization(materializeToTensor);
addTargetMaterialization([](OpBuilder &builder, BaseMemRefType type,
ValueRange inputs, Location loc) -> Value {
diff --git a/mlir/lib/Dialect/EmitC/Transforms/TypeConversions.cpp b/mlir/lib/Dialect/EmitC/Transforms/TypeConversions.cpp
index 0b3a494794f3f5..72c8fd0f324850 100644
--- a/mlir/lib/Dialect/EmitC/Transforms/TypeConversions.cpp
+++ b/mlir/lib/Dialect/EmitC/Transforms/TypeConversions.cpp
@@ -33,7 +33,6 @@ void mlir::populateEmitCSizeTTypeConversions(TypeConverter &converter) {
converter.addSourceMaterialization(materializeAsUnrealizedCast);
converter.addTargetMaterialization(materializeAsUnrealizedCast);
- converter.addArgumentMaterialization(materializeAsUnrealizedCast);
}
/// Get an unsigned integer or size data type corresponding to \p ty.
diff --git a/mlir/lib/Dialect/Linalg/Transforms/Detensorize.cpp b/mlir/lib/Dialect/Linalg/Transforms/Detensorize.cpp
index af38485291182f..61bc5022893741 100644
--- a/mlir/lib/Dialect/Linalg/Transforms/Detensorize.cpp
+++ b/mlir/lib/Dialect/Linalg/Transforms/Detensorize.cpp
@@ -154,7 +154,6 @@ class DetensorizeTypeConverter : public TypeConverter {
});
addSourceMaterialization(sourceMaterializationCallback);
- addArgumentMaterialization(sourceMaterializationCallback);
}
};
diff --git a/mlir/lib/Dialect/Quant/Transforms/StripFuncQuantTypes.cpp b/mlir/lib/Dialect/Quant/Transforms/StripFuncQuantTypes.cpp
index 61912722662830..71b88d1be1b05b 100644
--- a/mlir/lib/Dialect/Quant/Transforms/StripFuncQuantTypes.cpp
+++ b/mlir/lib/Dialect/Quant/Transforms/StripFuncQuantTypes.cpp
@@ -56,7 +56,6 @@ class QuantizedTypeConverter : public TypeConverter {
addConversion(convertQuantizedType);
addConversion(convertTensorType);
- addArgumentMaterialization(materializeConversion);
addSourceMaterialization(materializeConversion);
addTargetMaterialization(materializeConversion);
}
diff --git a/mlir/lib/Dialect/SparseTensor/Transforms/Utils/SparseTensorDescriptor.cpp b/mlir/lib/Dialect/SparseTensor/Transforms/Utils/SparseTensorDescriptor.cpp
index 834e3634cc130d..8bbb2cac5efdf3 100644
--- a/mlir/lib/Dialect/SparseTensor/Transforms/Utils/SparseTensorDescriptor.cpp
+++ b/mlir/lib/Dialect/SparseTensor/Transforms/Utils/SparseTensorDescriptor.cpp
@@ -69,9 +69,6 @@ SparseTensorTypeToBufferConverter::SparseTensorTypeToBufferConverter() {
// Required by scf.for 1:N type conversion.
addSourceMaterialization(materializeTuple);
-
- // Required as a workaround until we have full 1:N support.
- addArgumentMaterialization(materializeTuple);
}
//===----------------------------------------------------------------------===//
diff --git a/mlir/lib/Dialect/Vector/Transforms/VectorLinearize.cpp b/mlir/lib/Dialect/Vector/Transforms/VectorLinearize.cpp
index 757631944f224f..68535ae5a7a5c6 100644
--- a/mlir/lib/Dialect/Vector/Transforms/VectorLinearize.cpp
+++ b/mlir/lib/Dialect/Vector/Transforms/VectorLinearize.cpp
@@ -481,7 +481,6 @@ void mlir::vector::populateVectorLinearizeTypeConversionsAndLegality(
return builder.create<vector::ShapeCastOp>(loc, type, inputs.front());
};
- typeConverter.addArgumentMaterialization(materializeCast);
typeConverter.addSourceMaterialization(materializeCast);
typeConverter.addTargetMaterialization(materializeCast);
target.markUnknownOpDynamicallyLegal(
diff --git a/mlir/lib/Transforms/Utils/DialectConversion.cpp b/mlir/lib/Transforms/Utils/DialectConversion.cpp
index d4879c1bc333c3..22891046c78260 100644
--- a/mlir/lib/Transforms/Utils/DialectConversion.cpp
+++ b/mlir/lib/Transforms/Utils/DialectConversion.cpp
@@ -63,94 +63,266 @@ static OpBuilder::InsertPoint computeInsertPoint(Value value) {
return OpBuilder::InsertPoint(insertBlock, insertPt);
}
+/// Helper function that computes an insertion point where the given value is
+/// defined and can be used without a dominance violation.
+static OpBuilder::InsertPoint computeInsertPoint(ArrayRef<Value> vals) {
+ assert(!vals.empty() && "expected at least one value");
+ OpBuilder::InsertPoint pt = computeInsertPoint(vals.front());
+ for (Value v : vals.drop_front()) {
+ OpBuilder::InsertPoint pt2 = computeInsertPoint(v);
+ assert(pt.getBlock() == pt2.getBlock());
+ if (pt.getPoint() == pt.getBlock()->begin()) {
+ pt = pt2;
+ continue;
+ }
+ if (pt2.getPoint() == pt2.getBlock()->begin()) {
+ continue;
+ }
+ if (pt.getPoint()->isBeforeInBlock(&*pt2.getPoint()))
+ pt = pt2;
+ }
+ return pt;
+}
+
//===----------------------------------------------------------------------===//
// ConversionValueMapping
//===----------------------------------------------------------------------===//
namespace {
+struct SmallVectorMapInfo {
+ static SmallVector<Value, 1> getEmptyKey() { return SmallVector<Value, 1>{}; }
+ static SmallVector<Value, 1> getTombstoneKey() {
+ return SmallVector<Value, 1>{};
+ }
+ static ::llvm::hash_code getHashValue(SmallVector<Value, 1> val) {
+ return ::llvm::hash_combine_range(val.begin(), val.end());
+ }
+ static bool isEqual(SmallVector<Value, 1> LHS, SmallVector<Value, 1> RHS) {
+ return LHS == RHS;
+ }
+};
+
/// This class wraps a IRMapping to provide recursive lookup
/// functionality, i.e. we will traverse if the mapped value also has a mapping.
struct ConversionValueMapping {
- /// Lookup the most recently mapped value with the desired type in the
- /// mapping.
+ /// Find the most recently mapped values for the given value. If the value is
+ /// not mapped at all, return the given value.
+ SmallVector<Value, 1> lookupOrDefault(Value from) const;
+
+ /// TODO: Find most recently mapped or materialization with matching type. May
+ /// return the given value if the type matches.
+ SmallVector<Value, 1>
+ lookupOrDefault(Value from, SmallVector<Type, 1> desiredTypes) const;
+
+ Value lookupDirectSingleReplacement(Value from) const {
+ auto it = mapping.find(from);
+ if (it == mapping.end())
+ return Value();
+ const SmallVector<Value, 1> &repl = it->second;
+ if (repl.size() != 1)
+ return Value();
+ return repl.front();
+ /*
+ if (!mapping.contains(from)) return Value();
+ auto it = llvm::find(mapping, from);
+ const SmallVector<Value, 1> &repl = it->second;
+ if (repl.size() != 1) return Value();
+ return repl.front();
+ */
+ }
+
+ /// Find the most recently mapped values for the given value. If the value is
+ /// not mapped at all, return an empty vector.
+ SmallVector<Value, 1> lookupOrNull(Value from) const;
+
+ /// Find the most recently mapped values for the given value. If those values
+ /// have the desired types, return them. Otherwise, try to find a
+ /// materialization to the desired types.
///
- /// Special cases:
- /// - If the desired type is "null", simply return the most recently mapped
- /// value.
- /// - If there is no mapping to the desired type, also return the most
- /// recently mapped value.
- /// - If there is no mapping for the given value at all, return the given
- /// value.
- Value lookupOrDefault(Value from, Type desiredType = nullptr) const;
-
- /// Lookup a mapped value within the map, or return null if a mapping does not
- /// exist. If a mapping exists, this follows the same behavior of
- /// `lookupOrDefault`.
- Value lookupOrNull(Value from, Type desiredType = nullptr) const;
-
- /// Map a value to the one provided.
- void map(Value oldVal, Value newVal) {
- LLVM_DEBUG({
- for (Value it = newVal; it; it = mapping.lookupOrNull(it))
- assert(it != oldVal && "inserting cyclic mapping");
- });
- mapping.map(oldVal, newVal);
+ /// If the given value is not mapped at all or if there are no mapped values/
+ /// materialization results with the desired types, return an empty vector.
+ SmallVector<Value, 1> lookupOrNull(Value from,
+ SmallVector<Type, 1> desiredTypes) const;
+
+ Value lookupOrNull(Value from, Type desiredType) {
+ SmallVector<Value, 1> vals =
+ lookupOrNull(from, SmallVector<Type, 1>{desiredType});
+ if (vals.empty())
+ return Value();
+ assert(vals.size() == 1 && "expected single value");
+ return vals.front();
}
- /// Try to map a value to the one provided. Returns false if a transitive
- /// mapping from the new value to the old value already exists, true if the
- /// map was updated.
- bool tryMap(Value oldVal, Value newVal);
+ void erase(Value from) { mapping.erase(from); }
+
+ void map(Value from, ValueRange to) {
+#ifndef NDEBUG
+ assert(from && "expected non-null value");
+ assert(!to.empty() && "cannot map to zero values");
+ for (Value v : to)
+ assert(v && "expected non-null value");
+#endif
+ // assert(from != to && "cannot map value to itself");
+ // TODO: Check for cyclic mapping.
+ assert(!mapping.contains(from) && "value is already mapped");
+ mapping[from].assign(to.begin(), to.end());
+ }
+
+ void map(Value from, ArrayRef<BlockArgument> to) {
+ SmallVector<Value> vals;
+ for (Value v : to)
+ vals.push_back(v);
+ map(from, vals);
+ }
+ /*
+ void map(Value from, ArrayRef<Value> to) {
+ #ifndef NDEBUG
+ assert(from && "expected non-null value");
+ assert(!to.empty() && "cannot map to zero values");
+ for (Value v : to)
+ assert(v && "expected non-null value");
+ #endif
+ // assert(from != to && "cannot map value to itself");
+ // TODO: Check for cyclic mapping.
+ assert(!mapping.contains(from) && "value is already mapped");
+ mapping[from].assign(to.begin(), to.end());
+ }
+ */
+
+ void mapMaterialization(SmallVector<Value, 1> from,
+ SmallVector<Value, 1> to) {
+#ifndef NDEBUG
+ assert(!from.empty() && "from cannot be empty");
+ assert(!to.empty() && "to cannot be empty");
+ for (Value v : from) {
+ assert(v && "expected non-null value");
+ assert(!mapping.contains(v) &&
+ "cannot add materialization for mapped value");
+ }
+ for (Value v : to) {
+ assert(v && "expected non-null value");
+ }
+ assert(TypeRange(from) != TypeRange(to) &&
+ "cannot add materialization for identical type");
+ for (const SmallVector<Value, 1> &mat : materializations[from])
+ assert(TypeRange(mat) != TypeRange(to) &&
+ "cannot register duplicate materialization");
+#endif // NDEBUG
+ materializations[from].push_back(to);
+ }
- /// Drop the last mapping for the given value.
- void erase(Value value) { mapping.erase(value); }
+ void eraseMaterialization(SmallVector<Value, 1> from,
+ SmallVector<Value, 1> to) {
+ if (!materializations.count(from))
+ return;
+ auto it = llvm::find(materializations[from], to);
+ if (it == materializations[from].end())
+ return;
+ if (materializations[from].size() == 1)
+ materializations.erase(from);
+ else
+ materializations[from].erase(it);
+ }
/// Returns the inverse raw value mapping (without recursive query support).
DenseMap<Value, SmallVector<Value>> getInverse() const {
DenseMap<Value, SmallVector<Value>> inverse;
- for (auto &it : mapping.getValueMap())
- inverse[it.second].push_back(it.first);
+
+ for (auto &it : mapping)
+ for (Value v : it.second)
+ inverse[v].push_back(it.first);
+
+ for (auto &it : materializations)
+ for (const SmallVector<Value, 1> &mat : it.second)
+ for (Value v : mat)
+ for (Value v2 : it.first)
+ inverse[v].push_back(v2);
+
return inverse;
}
private:
- /// Current value mappings.
- IRMapping mapping;
+ /// Replacement mapping: Value -> ValueRange
+ DenseMap<Value, SmallVector<Value, 1>> mapping;
+
+ /// Materializations: ValueRange -> ValueRange*
+ DenseMap<SmallVector<Value, 1>, SmallVector<SmallVector<Value, 1>>,
+ SmallVectorMapInfo>
+ materializations;
};
} // namespace
-Value ConversionValueMapping::lookupOrDefault(Value from,
- Type desiredType) const {
- // Try to find the deepest value that has the desired type. If there is no
- // such value, simply return the deepest value.
- Value desiredValue;
- do {
- if (!desiredType || from.getType() == desiredType)
- desiredValue = from;
-
- Value mappedValue = mapping.lookupOrNull(from);
- if (!mappedValue)
- break;
- from = mappedValue;
- } while (true);
+SmallVector<Value, 1>
+ConversionValueMapping::lookupOrDefault(Value from) const {
+ SmallVector<Value, 1> to = lookupOrNull(from);
+ return to.empty() ? SmallVector<Value, 1>{from} : to;
+}
- // If the desired value was found use it, otherwise default to the leaf value.
- return desiredValue ? desiredValue : from;
+SmallVector<Value, 1> ConversionValueMapping::lookupOrDefault(
+ Value from, SmallVector<Type, 1> desiredTypes) const {
+#ifndef NDEBUG
+ assert(desiredTypes.size() > 0 && "expected non-empty types");
+ for (Type t : desiredTypes)
+ assert(t && "expected non-null type");
+#endif // NDEBUG
+
+ SmallVector<Value, 1> vals = lookupOrNull(from);
+ if (vals.empty()) {
+ // Value is not mapped. Return if the type matches.
+ if (TypeRange(from) == desiredTypes)
+ return {from};
+ // Check materializations.
+ auto it = materializations.find({from});
+ if (it == materializations.end())
+ return {};
+ for (const SmallVector<Value, 1> &mat : it->second)
+ if (TypeRange(mat) == desiredTypes)
+ return mat;
+ return {};
+ }
+
+ return lookupOrNull(from, desiredTypes);
}
-Value ConversionValueMapping::lookupOrNull(Value from, Type desiredType) const {
- Value result = lookupOrDefault(from, desiredType);
- if (result == from || (desiredType && result.getType() != desiredType))
- return nullptr;
+SmallVector<Value, 1> ConversionValueMapping::lookupOrNull(Value from) const {
+ auto it = mapping.find(from);
+ if (it == mapping.end())
+ return {};
+ SmallVector<Value, 1> result;
+ for (Value v : it->second) {
+ llvm::append_range(result, lookupOrDefault(v));
+ }
return result;
}
-bool ConversionValueMapping::tryMap(Value oldVal, Value newVal) {
- for (Value it = newVal; it; it = mapping.lookupOrNull(it))
- if (it == oldVal)
- return false;
- map(oldVal, newVal);
- return true;
+SmallVector<Value, 1>
+ConversionValueMapping::lookupOrNull(Value from,
+ SmallVector<Type, 1> desiredTypes) const {
+#ifndef NDEBUG
+ assert(desiredTypes.size() > 0 && "expected non-empty types");
+ for (Type t : desiredTypes)
+ assert(t && "expected non-null type");
+#endif // NDEBUG
+
+ SmallVector<Value, 1> vals = lookupOrNull(from);
+ if (vals.empty())
+ return {};
+
+ // There is a mapping and the types match.
+ if (TypeRange(vals) == desiredTypes)
+ return vals;
+
+ // There is a mapping, but the types do not match. Try to find a matching
+ // materialization.
+ auto it = materializations.find(vals);
+ if (it == materializations.end())
+ return {};
+ for (const SmallVector<Value, 1> &mat : it->second)
+ if (TypeRange(mat) == desiredTypes)
+ return mat;
+
+ // No materialization found. Return an empty vector.
+ return {};
}
//===----------------------------------------------------------------------===//
@@ -776,7 +948,7 @@ struct ConversionPatternRewriterImpl : public RewriterBase::Listener {
LogicalResult remapValues(StringRef valueDiagTag,
std::optional<Location> inputLoc,
PatternRewriter &rewriter, ValueRange values,
- SmallVector<SmallVector<Value>> &remapped);
+ SmallVector<SmallVector<Value, 1>> &remapped);
/// Return "true" if the given operation is ignored, and does not need to be
/// converted.
@@ -832,32 +1004,6 @@ struct ConversionPatternRewriterImpl : public RewriterBase::Listener {
.front();
}
- /// Build an N:1 materialization for the given original value that was
- /// replaced with the given replacement values.
- ///
- /// This is a workaround around incomplete 1:N support in the dialect
- /// conversion driver. The conversion mapping can store only 1:1 replacements
- /// and the conversion patterns only support single Value replacements in the
- /// adaptor, so N values must be converted back to a single value. This
- /// function will be deleted when full 1:N support has been added.
- ///
- /// This function inserts an argument materialization back to the original
- /// type, followed by a target materialization to the legalized type (if
- /// applicable).
- void insertNTo1Materialization(OpBuilder::InsertPoint ip, Location loc,
- ValueRange replacements, Value originalValue,
- const TypeConverter *converter);
-
- /// Unpack an N:1 materialization and return the inputs of the
- /// materialization. This function unpacks only those materializations that
- /// were built with `insertNTo1Materialization`.
- ///
- /// This is a workaround around incomplete 1:N support in the dialect
- /// conversion driver. It allows us to write 1:N conversion patterns while
- /// 1:N support is still missing in the conversion value mapping. This
- /// function will be deleted when full 1:N support has been added.
- SmallVector<Value> unpackNTo1Materialization(Value value);
-
//===--------------------------------------------------------------------===//
// Rewriter Notification Hooks
//===--------------------------------------------------------------------===//
@@ -1095,12 +1241,9 @@ UnresolvedMaterializationRewrite::UnresolvedMaterializationRewrite(
}
void UnresolvedMaterializationRewrite::rollback() {
- if (getMaterializationKind() == MaterializationKind::Target) {
- for (Value input : op->getOperands())
- rewriterImpl.mapping.erase(input);
- }
+ rewriterImpl.mapping.eraseMaterialization(op->getOperands(),
+ op->getResults());
rewriterImpl.unresolvedMaterializations.erase(getOperation());
- rewriterImpl.nTo1TempMaterializations.erase(getOperation());
op->erase();
}
@@ -1144,7 +1287,7 @@ void ConversionPatternRewriterImpl::undoRewrites(unsigned numRewritesToKeep) {
LogicalResult ConversionPatternRewriterImpl::remapValues(
StringRef valueDiagTag, std::optional<Location> inputLoc,
PatternRewriter &rewriter, ValueRange values,
- SmallVector<SmallVector<Value>> &remapped) {
+ SmallVector<SmallVector<Value, 1>> &remapped) {
remapped.reserve(llvm::size(values));
for (const auto &it : llvm::enumerate(values)) {
@@ -1152,18 +1295,12 @@ LogicalResult ConversionPatternRewriterImpl::remapValues(
Type origType = operand.getType();
Location operandLoc = inputLoc ? *inputLoc : operand.getLoc();
- // Find the most recently mapped value. Unpack all temporary N:1
- // materializations. Such conversions are a workaround around missing
- // 1:N support in the ConversionValueMapping. (The conversion patterns
- // already support 1:N replacements.)
- Value repl = mapping.lookupOrDefault(operand);
- SmallVector<Value> unpacked = unpackNTo1Materialization(repl);
-
if (!currentTypeConverter) {
// The current pattern does not have a type converter. I.e., it does not
// distinguish between legal and illegal types. For each operand, simply
// pass through the most recently mapped value.
- remapped.push_back(std::move(unpacked));
+ SmallVector<Value, 1> vals = mapping.lookupOrDefault(operand);
+ remapped.push_back(vals);
continue;
}
@@ -1177,49 +1314,30 @@ LogicalResult ConversionPatternRewriterImpl::remapValues(
return failure();
}
- // If a type is converted to 0 types, there is nothing to do.
+ // Try to find a mapped value with the desired type.
if (legalTypes.empty()) {
remapped.push_back({});
continue;
}
- if (legalTypes.size() != 1) {
- // TODO: This is a 1:N conversion. The conversion value mapping does not
- // store such materializations yet. If the types of the most recently
- // mapped values do not match, build a target materialization.
- if (TypeRange(unpacked) == legalTypes) {
- remapped.push_back(std::move(unpacked));
- continue;
- }
-
- // Insert a target materialization if the current pattern expects
- // different legalized types.
- ValueRange targetMat = buildUnresolvedMaterialization(
- MaterializationKind::Target, computeInsertPoint(repl), operandLoc,
- /*inputs=*/unpacked, /*outputType=*/legalTypes,
- /*originalType=*/origType, currentTypeConverter);
- remapped.push_back(targetMat);
+ SmallVector<Value, 1> mat = mapping.lookupOrDefault(operand, legalTypes);
+ if (!mat.empty()) {
+ // Mapped value has the correct type or there is an existing
+ // materialization. Or the value is not mapped at all and has the
+ // correct type.
+ remapped.push_back(mat);
continue;
}
- // Handle 1->1 type conversions.
- Type desiredType = legalTypes.front();
- // Try to find a mapped value with the desired type. (Or the operand itself
- // if the value is not mapped at all.)
- Value newOperand = mapping.lookupOrDefault(operand, desiredType);
- if (newOperand.getType() != desiredType) {
- // If the looked up value's type does not have the desired type, it means
- // that the value was replaced with a value of different type and no
- // target materialization was created yet.
- Value castValue = buildUnresolvedMaterialization(
- MaterializationKind::Target, computeInsertPoint(newOperand),
- operandLoc,
- /*inputs=*/unpacked, /*outputType=*/desiredType,
- /*originalType=*/origType, currentTypeConverter);
- mapping.map(newOperand, castValue);
- newOperand = castValue;
- }
- remapped.push_back({newOperand});
+ // Create a materialization for the most recently mapped value.
+ SmallVector<Value, 1> vals = mapping.lookupOrDefault(operand);
+ ValueRange castValues = buildUnresolvedMaterialization(
+ MaterializationKind::Target, computeInsertPoint(vals), operandLoc,
+ /*inputs=*/vals, /*outputTypes=*/legalTypes, /*originalType=*/origType,
+ currentTypeConverter);
+
+ mapping.mapMaterialization(vals, castValues);
+ remapped.push_back(castValues);
}
return success();
}
@@ -1347,15 +1465,10 @@ Block *ConversionPatternRewriterImpl::applySignatureConversion(
continue;
}
- // This is a 1->1+ mapping. 1->N mappings are not fully supported in the
- // dialect conversion. Therefore, we need an argument materialization to
- // turn the replacement block arguments into a single SSA value that can be
- // used as a replacement.
+ // Map to replacement arguments.
auto replArgs =
newBlock->getArguments().slice(inputMap->inputNo, inputMap->size);
- insertNTo1Materialization(
- OpBuilder::InsertPoint(newBlock, newBlock->begin()), origArg.getLoc(),
- /*replacements=*/replArgs, /*outputValue=*/origArg, converter);
+ mapping.map(origArg, replArgs);
appendRewrite<ReplaceBlockArgRewrite>(block, origArg);
}
@@ -1398,67 +1511,6 @@ ValueRange ConversionPatternRewriterImpl::buildUnresolvedMaterialization(
return convertOp.getResults();
}
-void ConversionPatternRewriterImpl::insertNTo1Materialization(
- OpBuilder::InsertPoint ip, Location loc, ValueRange replacements,
- Value originalValue, const TypeConverter *converter) {
- // Insert argument materialization back to the original type.
- Type originalType = originalValue.getType();
- UnrealizedConversionCastOp argCastOp;
- Value argMat = buildUnresolvedMaterialization(
- MaterializationKind::Argument, ip, loc,
- /*inputs=*/replacements, originalType,
- /*originalType=*/Type(), converter, &argCastOp);
- if (argCastOp)
- nTo1TempMaterializations.insert(argCastOp);
- mapping.map(originalValue, argMat);
-
- // Insert target materialization to the legalized type.
- Type legalOutputType;
- if (converter) {
- legalOutputType = converter->convertType(originalType);
- } else if (replacements.size() == 1) {
- // When there is no type converter, assume that the replacement value
- // types are legal. This is reasonable to assume because they were
- // specified by the user.
- // FIXME: This won't work for 1->N conversions because multiple output
- // types are not supported in parts of the dialect conversion. In such a
- // case, we currently use the original value type.
- legalOutputType = replacements[0].getType();
- }
- if (legalOutputType && legalOutputType != originalType) {
- UnrealizedConversionCastOp targetCastOp;
- Value targetMat = buildUnresolvedMaterialization(
- MaterializationKind::Target, computeInsertPoint(argMat), loc,
- /*inputs=*/argMat, /*outputType=*/legalOutputType,
- /*originalType=*/originalType, converter, &targetCastOp);
- if (targetCastOp)
- nTo1TempMaterializations.insert(targetCastOp);
- mapping.map(argMat, targetMat);
- }
-}
-
-SmallVector<Value>
-ConversionPatternRewriterImpl::unpackNTo1Materialization(Value value) {
- // Unpack unrealized_conversion_cast ops that were inserted as a N:1
- // workaround.
- auto castOp = value.getDefiningOp<UnrealizedConversionCastOp>();
- if (!castOp)
- return {value};
- if (!nTo1TempMaterializations.contains(castOp))
- return {value};
- assert(castOp->getNumResults() == 1 && "expected single result");
-
- SmallVector<Value> result;
- for (Value v : castOp.getOperands()) {
- // Keep unpacking if possible. This is needed because during block
- // signature conversions and 1:N op replacements, the driver may have
- // inserted two materializations back-to-back: first an argument
- // materialization, then a target materialization.
- llvm::append_range(result, unpackNTo1Materialization(v));
- }
- return result;
-}
-
//===----------------------------------------------------------------------===//
// Rewriter Notification Hooks
@@ -1510,7 +1562,7 @@ void ConversionPatternRewriterImpl::notifyOpReplaced(
result.getLoc(), /*inputs=*/ValueRange(),
/*outputType=*/result.getType(), /*originalType=*/Type(),
currentTypeConverter);
- mapping.map(result, sourceMat);
+ mapping.map(result, {sourceMat});
continue;
} else {
// Make sure that the user does not mess with unresolved materializations
@@ -1524,18 +1576,8 @@ void ConversionPatternRewriterImpl::notifyOpReplaced(
}
// Remap result to replacement value.
- if (repl.empty())
- continue;
-
- if (repl.size() == 1) {
- // Single replacement value: replace directly.
- mapping.map(result, repl.front());
- } else {
- // Multiple replacement values: insert N:1 materialization.
- insertNTo1Materialization(computeInsertPoint(result), result.getLoc(),
- /*replacements=*/repl, /*outputValue=*/result,
- currentTypeConverter);
- }
+ if (!repl.empty())
+ mapping.map(result, repl);
}
appendRewrite<ReplaceOperationRewrite>(op, currentTypeConverter);
@@ -1614,8 +1656,13 @@ void ConversionPatternRewriter::replaceOp(Operation *op, ValueRange newValues) {
<< "** Replace : '" << op->getName() << "'(" << op << ")\n";
});
SmallVector<ValueRange> newVals;
- for (int i = 0; i < newValues.size(); ++i)
- newVals.push_back(newValues.slice(i, 1));
+ for (int i = 0; i < newValues.size(); ++i) {
+ if (newValues[i]) {
+ newVals.push_back(newValues.slice(i, 1));
+ } else {
+ newVals.push_back(ValueRange());
+ }
+ }
impl->notifyOpReplaced(op, newVals);
}
@@ -1682,11 +1729,14 @@ void ConversionPatternRewriter::replaceUsesOfBlockArgument(BlockArgument from,
<< "'(" << from.getOwner()->getParentOp() << ")\n";
});
impl->appendRewrite<ReplaceBlockArgRewrite>(from.getOwner(), from);
- impl->mapping.map(impl->mapping.lookupOrDefault(from), to);
+ SmallVector<Value, 1> mapped = impl->mapping.lookupOrDefault(from);
+ assert(mapped.size() == 1 &&
+ "replaceUsesOfBlockArgument is not supported for 1:N replacements");
+ impl->mapping.map(mapped.front(), to);
}
Value ConversionPatternRewriter::getRemappedValue(Value key) {
- SmallVector<SmallVector<Value>> remappedValues;
+ SmallVector<SmallVector<Value, 1>> remappedValues;
if (failed(impl->remapValues("value", /*inputLoc=*/std::nullopt, *this, key,
remappedValues)))
return nullptr;
@@ -1699,7 +1749,7 @@ ConversionPatternRewriter::getRemappedValues(ValueRange keys,
SmallVectorImpl<Value> &results) {
if (keys.empty())
return success();
- SmallVector<SmallVector<Value>> remapped;
+ SmallVector<SmallVector<Value, 1>> remapped;
if (failed(impl->remapValues("value", /*inputLoc=*/std::nullopt, *this, keys,
remapped)))
return failure();
@@ -1825,7 +1875,7 @@ ConversionPattern::matchAndRewrite(Operation *op,
getTypeConverter());
// Remap the operands of the operation.
- SmallVector<SmallVector<Value>> remapped;
+ SmallVector<SmallVector<Value, 1>> remapped;
if (failed(rewriterImpl.remapValues("operand", op->getLoc(), rewriter,
op->getOperands(), remapped))) {
return failure();
@@ -2582,19 +2632,6 @@ legalizeUnresolvedMaterialization(RewriterBase &rewriter,
rewriter.setInsertionPoint(op);
SmallVector<Value> newMaterialization;
switch (rewrite->getMaterializationKind()) {
- case MaterializationKind::Argument: {
- // Try to materialize an argument conversion.
- assert(op->getNumResults() == 1 && "expected single result");
- Value argMat = converter->materializeArgumentConversion(
- rewriter, op->getLoc(), op.getResultTypes().front(), inputOperands);
- if (argMat) {
- newMaterialization.push_back(argMat);
- break;
- }
- }
- // If an argument materialization failed, fallback to trying a target
- // materialization.
- [[fallthrough]];
case MaterializationKind::Target:
newMaterialization = converter->materializeTargetConversion(
rewriter, op->getLoc(), op.getResultTypes(), inputOperands,
@@ -2742,6 +2779,12 @@ void OperationConverter::finalize(ConversionPatternRewriter &rewriter) {
std::tie(replacedValues, converter) =
getReplacedValues(rewriterImpl.rewrites[i].get());
for (Value originalValue : replacedValues) {
+ // If this value is directly replaced with a value of the same type,
+ // there is nothing to do.
+ Value repl =
+ rewriterImpl.mapping.lookupDirectSingleReplacement(originalValue);
+ if (repl && repl.getType() == originalValue.getType())
+ continue;
// If the type of this value changed and the value is still live, we need
// to materialize a conversion.
if (rewriterImpl.mapping.lookupOrNull(originalValue,
@@ -2753,16 +2796,16 @@ void OperationConverter::finalize(ConversionPatternRewriter &rewriter) {
continue;
// Legalize this value replacement.
- Value newValue = rewriterImpl.mapping.lookupOrNull(originalValue);
- assert(newValue && "replacement value not found");
+ SmallVector<Value, 1> newValues =
+ rewriterImpl.mapping.lookupOrNull(originalValue);
+ assert(!newValues.empty() && "replacement value not found");
Value castValue = rewriterImpl.buildUnresolvedMaterialization(
- MaterializationKind::Source, computeInsertPoint(newValue),
+ MaterializationKind::Source, computeInsertPoint(newValues),
originalValue.getLoc(),
- /*inputs=*/newValue, /*outputType=*/originalValue.getType(),
+ /*inputs=*/newValues, /*outputType=*/originalValue.getType(),
/*originalType=*/Type(), converter);
- rewriterImpl.mapping.map(originalValue, castValue);
- inverseMapping[castValue].push_back(originalValue);
- llvm::erase(inverseMapping[newValue], originalValue);
+ rewriterImpl.mapping.mapMaterialization(newValues, {castValue});
+ llvm::append_range(inverseMapping[castValue], newValues);
}
}
}
diff --git a/mlir/test/Transforms/test-legalizer.mlir b/mlir/test/Transforms/test-legalizer.mlir
index 3ebee795a251df..3cdb9f80de6d8b 100644
--- a/mlir/test/Transforms/test-legalizer.mlir
+++ b/mlir/test/Transforms/test-legalizer.mlir
@@ -64,9 +64,6 @@ func.func @remap_call_1_to_1(%arg0: i64) {
// Contents of the old block are moved to the new block.
// CHECK-NEXT: notifyOperationInserted: test.return, was linked, exact position unknown
-// The new block arguments are used in "test.return".
-// CHECK-NEXT: notifyOperationModified: test.return
-
// The old block is erased.
// CHECK-NEXT: notifyBlockErased
diff --git a/mlir/test/lib/Dialect/Func/TestDecomposeCallGraphTypes.cpp b/mlir/test/lib/Dialect/Func/TestDecomposeCallGraphTypes.cpp
index de511c58ae6ee0..0b8d4c0ee3bb0b 100644
--- a/mlir/test/lib/Dialect/Func/TestDecomposeCallGraphTypes.cpp
+++ b/mlir/test/lib/Dialect/Func/TestDecomposeCallGraphTypes.cpp
@@ -139,7 +139,7 @@ struct TestDecomposeCallGraphTypes
tupleType.getFlattenedTypes(types);
return success();
});
- typeConverter.addArgumentMaterialization(buildMakeTupleOp);
+ typeConverter.addSourceMaterialization(buildMakeTupleOp);
typeConverter.addTargetMaterialization(buildDecomposeTuple);
populateDecomposeCallGraphTypesPatterns(context, typeConverter, patterns);
diff --git a/mlir/test/lib/Dialect/Test/TestPatterns.cpp b/mlir/test/lib/Dialect/Test/TestPatterns.cpp
index 0b5239168efc43..b719519b8f529e 100644
--- a/mlir/test/lib/Dialect/Test/TestPatterns.cpp
+++ b/mlir/test/lib/Dialect/Test/TestPatterns.cpp
@@ -1235,7 +1235,6 @@ struct TestTypeConverter : public TypeConverter {
using TypeConverter::TypeConverter;
TestTypeConverter() {
addConversion(convertType);
- addArgumentMaterialization(materializeCast);
addSourceMaterialization(materializeCast);
}
@@ -1267,8 +1266,8 @@ struct TestTypeConverter : public TypeConverter {
return success();
}
- /// Hook for materializing a conversion. This is necessary because we generate
- /// 1->N type mappings.
+ /// Hook for materializing a conversion. This is necessary because we
+ /// generate 1->N type mappings.
static Value materializeCast(OpBuilder &builder, Type resultType,
ValueRange inputs, Location loc) {
return builder.create<TestCastOp>(loc, resultType, inputs).getResult();
@@ -1340,7 +1339,8 @@ struct TestLegalizePatternDriver
// correct error code from conversion driver.
target.addDynamicallyLegalOp<ILLegalOpG>([](ILLegalOpG) { return false; });
- // Expect the type_producer/type_consumer operations to only operate on f64.
+ // Expect the type_producer/type_consumer operations to only operate on
+ // f64.
target.addDynamicallyLegalOp<TestTypeProducerOp>(
[](TestTypeProducerOp op) { return op.getType().isF64(); });
target.addDynamicallyLegalOp<TestTypeConsumerOp>([](TestTypeConsumerOp op) {
@@ -1357,7 +1357,8 @@ struct TestLegalizePatternDriver
target.addDynamicallyLegalOp<TestRecursiveRewriteOp>(
[](TestRecursiveRewriteOp op) { return op.getDepth() == 0; });
- // Create a dynamically legal rule that can only be legalized by folding it.
+ // Create a dynamically legal rule that can only be legalized by folding
+ // it.
target.addDynamicallyLegalOp<TestOpInPlaceSelfFold>(
[](TestOpInPlaceSelfFold op) { return op.getFolded(); });
diff --git a/mlir/test/lib/Transforms/TestDialectConversion.cpp b/mlir/test/lib/Transforms/TestDialectConversion.cpp
index 2cc1fb5d39d788..a03bf0a1023d57 100644
--- a/mlir/test/lib/Transforms/TestDialectConversion.cpp
+++ b/mlir/test/lib/Transforms/TestDialectConversion.cpp
@@ -28,7 +28,6 @@ namespace {
struct PDLLTypeConverter : public TypeConverter {
PDLLTypeConverter() {
addConversion(convertType);
- addArgumentMaterialization(materializeCast);
addSourceMaterialization(materializeCast);
}
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