[Mlir-commits] [mlir] [mlir] [dataflow] further optimize dataflow compile time (PR #149804)
llvmlistbot at llvm.org
llvmlistbot at llvm.org
Mon Jul 21 05:30:19 PDT 2025
llvmbot wrote:
<!--LLVM PR SUMMARY COMMENT-->
@llvm/pr-subscribers-mlir
Author: donald chen (cxy-1993)
<details>
<summary>Changes</summary>
Optimize dataflow compilation time by skipping initialization of irrelevant operations
---
Full diff: https://github.com/llvm/llvm-project/pull/149804.diff
4 Files Affected:
- (modified) mlir/include/mlir/Analysis/DataFlowFramework.h (+9)
- (modified) mlir/lib/Analysis/DataFlow/DenseAnalysis.cpp (+8)
- (modified) mlir/test/lib/Analysis/DataFlow/TestDenseBackwardDataFlowAnalysis.cpp (+1)
- (modified) mlir/test/lib/Analysis/DataFlow/TestDenseForwardDataFlowAnalysis.cpp (+1)
``````````diff
diff --git a/mlir/include/mlir/Analysis/DataFlowFramework.h b/mlir/include/mlir/Analysis/DataFlowFramework.h
index 49862927caff2..67d593a7bfad4 100644
--- a/mlir/include/mlir/Analysis/DataFlowFramework.h
+++ b/mlir/include/mlir/Analysis/DataFlowFramework.h
@@ -658,6 +658,12 @@ class DataFlowAnalysis {
return solver.getOrCreateState<StateT>(anchor);
}
+ /// Add irrelevant program point.
+ template <typename PointT>
+ void addIrrelevantPoint(PointT point) {
+ irrelevantPoints.insert(ProgramPoint(point));
+ }
+
/// Get a read-only analysis state for the given point and create a dependency
/// on `dependent`. If the return state is updated elsewhere, this analysis is
/// re-invoked on the dependent.
@@ -695,6 +701,9 @@ class DataFlowAnalysis {
StringRef debugName;
#endif // LLVM_ENABLE_ABI_BREAKING_CHECKS
+ /// Program points shouldn't analyzed by this analysis.
+ DenseSet<ProgramPoint> irrelevantPoints;
+
private:
/// The parent data-flow solver.
DataFlowSolver &solver;
diff --git a/mlir/lib/Analysis/DataFlow/DenseAnalysis.cpp b/mlir/lib/Analysis/DataFlow/DenseAnalysis.cpp
index d05374f667a51..0d0d841b0bff8 100644
--- a/mlir/lib/Analysis/DataFlow/DenseAnalysis.cpp
+++ b/mlir/lib/Analysis/DataFlow/DenseAnalysis.cpp
@@ -104,6 +104,10 @@ void AbstractDenseForwardDataFlowAnalysis::visitCallOperation(
LogicalResult
AbstractDenseForwardDataFlowAnalysis::processOperation(Operation *op) {
+ // Skip irrelavant program points.
+ if (irrelevantPoints.contains(ProgramPoint(op)))
+ return;
+
ProgramPoint *point = getProgramPointAfter(op);
// If the containing block is not executable, bail out.
if (op->getBlock() != nullptr &&
@@ -333,6 +337,10 @@ void AbstractDenseBackwardDataFlowAnalysis::visitCallOperation(
LogicalResult
AbstractDenseBackwardDataFlowAnalysis::processOperation(Operation *op) {
+ // Skip irrelavant program points.
+ if (irrelevantPoints.contains(ProgramPoint(op)))
+ return;
+
ProgramPoint *point = getProgramPointBefore(op);
// If the containing block is not executable, bail out.
if (op->getBlock() != nullptr &&
diff --git a/mlir/test/lib/Analysis/DataFlow/TestDenseBackwardDataFlowAnalysis.cpp b/mlir/test/lib/Analysis/DataFlow/TestDenseBackwardDataFlowAnalysis.cpp
index d57b41c41de64..f73430fb78c58 100644
--- a/mlir/test/lib/Analysis/DataFlow/TestDenseBackwardDataFlowAnalysis.cpp
+++ b/mlir/test/lib/Analysis/DataFlow/TestDenseBackwardDataFlowAnalysis.cpp
@@ -147,6 +147,7 @@ LogicalResult NextAccessAnalysis::visitOperation(Operation *op,
void NextAccessAnalysis::buildOperationEquivalentLatticeAnchor(Operation *op) {
if (isMemoryEffectFree(op)) {
+ addIrrelevantPoint(op);
unionLatticeAnchors<NextAccess>(getProgramPointBefore(op),
getProgramPointAfter(op));
}
diff --git a/mlir/test/lib/Analysis/DataFlow/TestDenseForwardDataFlowAnalysis.cpp b/mlir/test/lib/Analysis/DataFlow/TestDenseForwardDataFlowAnalysis.cpp
index a88ed7f8dea8b..ea5614c24a6bf 100644
--- a/mlir/test/lib/Analysis/DataFlow/TestDenseForwardDataFlowAnalysis.cpp
+++ b/mlir/test/lib/Analysis/DataFlow/TestDenseForwardDataFlowAnalysis.cpp
@@ -154,6 +154,7 @@ LogicalResult LastModifiedAnalysis::visitOperation(
void LastModifiedAnalysis::buildOperationEquivalentLatticeAnchor(
Operation *op) {
if (isMemoryEffectFree(op)) {
+ addIrrelevantPoint(op);
unionLatticeAnchors<LastModification>(getProgramPointBefore(op),
getProgramPointAfter(op));
}
``````````
</details>
https://github.com/llvm/llvm-project/pull/149804
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