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[mlir][Transforms][NFC] Dialect conversion: Eagerly build reverse mapping #101476

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Merged
merged 1 commit into from
Aug 9, 2024
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[mlir][Transforms][NFC] Dialect conversion: Eagerly build reverse mapping #101476

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26 changes: 12 additions & 14 deletions mlir/lib/Transforms/Utils/DialectConversion.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -2352,7 +2352,7 @@ struct OperationConverter {
LogicalResult legalizeUnresolvedMaterializations(
ConversionPatternRewriter &rewriter,
ConversionPatternRewriterImpl &rewriterImpl,
std::optional<DenseMap<Value, SmallVector<Value>>> &inverseMapping);
DenseMap<Value, SmallVector<Value>> &inverseMapping);

/// Legalize an operation result that was marked as "erased".
LogicalResult
Expand Down Expand Up @@ -2454,10 +2454,12 @@ LogicalResult OperationConverter::convertOperations(ArrayRef<Operation *> ops) {

LogicalResult
OperationConverter::finalize(ConversionPatternRewriter &rewriter) {
std::optional<DenseMap<Value, SmallVector<Value>>> inverseMapping;
ConversionPatternRewriterImpl &rewriterImpl = rewriter.getImpl();
if (failed(legalizeConvertedArgumentTypes(rewriter, rewriterImpl)) ||
failed(legalizeUnresolvedMaterializations(rewriter, rewriterImpl,
if (failed(legalizeConvertedArgumentTypes(rewriter, rewriterImpl)))
return failure();
DenseMap<Value, SmallVector<Value>> inverseMapping =
rewriterImpl.mapping.getInverse();
if (failed(legalizeUnresolvedMaterializations(rewriter, rewriterImpl,
inverseMapping)))
return failure();

Expand All @@ -2483,15 +2485,11 @@ OperationConverter::finalize(ConversionPatternRewriter &rewriter) {
if (result.getType() == newValue.getType())
continue;

// Compute the inverse mapping only if it is really needed.
if (!inverseMapping)
inverseMapping = rewriterImpl.mapping.getInverse();

// Legalize this result.
rewriter.setInsertionPoint(op);
if (failed(legalizeChangedResultType(
op, result, newValue, opReplacement->getConverter(), rewriter,
rewriterImpl, *inverseMapping)))
rewriterImpl, inverseMapping)))
return failure();
}
}
Expand All @@ -2503,6 +2501,8 @@ LogicalResult OperationConverter::legalizeConvertedArgumentTypes(
ConversionPatternRewriterImpl &rewriterImpl) {
// Functor used to check if all users of a value will be dead after
// conversion.
// TODO: This should probably query the inverse mapping, same as in
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@matthias-springer matthias-springer Aug 1, 2024 •
edited
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I think there is an unrelated bug here, will investigate separately, but putting a TODO.

// `legalizeChangedResultType`.
auto findLiveUser = [&](Value val) {
auto liveUserIt = llvm::find_if_not(val.getUsers(), [&](Operation *user) {
return rewriterImpl.isOpIgnored(user);
Expand Down Expand Up @@ -2796,20 +2796,18 @@ static LogicalResult legalizeUnresolvedMaterialization(
LogicalResult OperationConverter::legalizeUnresolvedMaterializations(
ConversionPatternRewriter &rewriter,
ConversionPatternRewriterImpl &rewriterImpl,
std::optional<DenseMap<Value, SmallVector<Value>>> &inverseMapping) {
inverseMapping = rewriterImpl.mapping.getInverse();

DenseMap<Value, SmallVector<Value>> &inverseMapping) {
// As an initial step, compute all of the inserted materializations that we
// expect to persist beyond the conversion process.
DenseMap<Operation *, UnresolvedMaterializationRewrite *> materializationOps;
SetVector<UnresolvedMaterializationRewrite *> necessaryMaterializations;
computeNecessaryMaterializations(materializationOps, rewriter, rewriterImpl,
*inverseMapping, necessaryMaterializations);
inverseMapping, necessaryMaterializations);

// Once computed, legalize any necessary materializations.
for (auto *mat : necessaryMaterializations) {
if (failed(legalizeUnresolvedMaterialization(
*mat, materializationOps, rewriter, rewriterImpl, *inverseMapping)))
*mat, materializationOps, rewriter, rewriterImpl, inverseMapping)))
return failure();
}
return success();
Expand Down
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