[flang-commits] [flang] [flang] Canonicalize fir.array_coor by pulling in embox/rebox. (PR #92858)

[Slava Zakharin via flang-commits]

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@@ -417,6 +423,216 @@ mlir::LogicalResult fir::ArrayCoorOp::verify() {
   return mlir::success();
 }
 
+// Pull in fir.embox and fir.rebox into fir.array_coor when possible.
+struct SimplifyArrayCoorOp : public mlir::OpRewritePattern<fir::ArrayCoorOp> {
+  using mlir::OpRewritePattern<fir::ArrayCoorOp>::OpRewritePattern;
+  mlir::LogicalResult
+  matchAndRewrite(fir::ArrayCoorOp op,
+                  mlir::PatternRewriter &rewriter) const override {
+    mlir::Value memref = op.getMemref();
+    if (!mlir::isa<fir::BaseBoxType>(memref.getType()))
+      return mlir::failure();
+
+    mlir::Value boxedMemref, boxedShape, boxedSlice;
+    if (auto emboxOp =
+            mlir::dyn_cast_or_null<fir::EmboxOp>(memref.getDefiningOp())) {
+      boxedMemref = emboxOp.getMemref();
+      boxedShape = emboxOp.getShape();
+      boxedSlice = emboxOp.getSlice();
+      // If any of operands, that are not currently supported for migration
+      // to ArrayCoorOp, is present, don't rewrite.
+      if (!emboxOp.getTypeparams().empty() || emboxOp.getSourceBox() ||
+          emboxOp.getAccessMap())
+        return mlir::failure();
+    } else if (auto reboxOp = mlir::dyn_cast_or_null<fir::ReboxOp>(
+                   memref.getDefiningOp())) {
+      boxedMemref = reboxOp.getBox();
+      boxedShape = reboxOp.getShape();
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vzakhari wrote:

Thanks!

https://github.com/llvm/llvm-project/pull/92858