[Mlir-commits] [mlir] [mlir] Add `arith-int-range-narrowing` pass (PR #112404)

[Jakub Kuderski]

================
@@ -214,6 +455,32 @@ struct IntRangeOptimizationsPass
       signalPassFailure();
   }
 };
+
+struct IntRangeNarrowingPass final
+    : arith::impl::ArithIntRangeNarrowingBase<IntRangeNarrowingPass> {
+  using ArithIntRangeNarrowingBase::ArithIntRangeNarrowingBase;
+
+  void runOnOperation() override {
+    Operation *op = getOperation();
+    MLIRContext *ctx = op->getContext();
+    DataFlowSolver solver;
+    solver.load<DeadCodeAnalysis>();
+    solver.load<IntegerRangeAnalysis>();
+    if (failed(solver.initializeAndRun(op)))
+      return signalPassFailure();
+
+    DataFlowListener listener(solver);
+
+    RewritePatternSet patterns(ctx);
+    populateIntRangeNarrowingPatterns(patterns, solver, bitwidthsSupported);
+
+    GreedyRewriteConfig config;
+    config.listener = &listener;
+
+    if (failed(applyPatternsAndFoldGreedily(op, std::move(patterns), config)))
+      signalPassFailure();
----------------
kuhar wrote:

`walkAndApplyPatterns` uses the post order traversal -- is the lack of folders the issue?

https://github.com/llvm/llvm-project/pull/112404