[Mlir-commits] [mlir] [mlir][tosa] Canonicalize avg_pool2d/max_pool2d no-ops (PR #203571)

[Luke Hutton]

================
@@ -271,6 +271,41 @@ struct AvgPool2dAdaptiveToAvgPool2d
   }
 };
 
+struct AvgPool2dIsNoOp : public OpRewritePattern<tosa::AvgPool2dOp> {
+  using OpRewritePattern::OpRewritePattern;
+
+  LogicalResult matchAndRewrite(tosa::AvgPool2dOp op,
+                                PatternRewriter &rewriter) const override {
+    const auto inputType = llvm::cast<ShapedType>(op.getInput().getType());
+    if (!llvm::isa<FloatType>(inputType.getElementType()))
+      return rewriter.notifyMatchFailure(op,
+                                         "expected floating-point input type");
+
+    if (!matchPattern(op.getInputZp(), m_Constant()) ||
+        !matchPattern(op.getOutputZp(), m_Constant()))
+      return rewriter.notifyMatchFailure(
+          op,
+          "expected input and output zero points to be statically verifiable");
+
+    if (!llvm::all_of(op.getKernel(), [](int64_t val) { return val == 1; }))
+      return rewriter.notifyMatchFailure(op, "expected unit kernel");
+
+    if (!llvm::all_of(op.getStride(), [](int64_t val) { return val == 1; }))
+      return rewriter.notifyMatchFailure(op, "expected unit stride");
+
+    if (!llvm::all_of(op.getPad(), [](int64_t val) { return val == 0; }))
+      return rewriter.notifyMatchFailure(op, "expected zero padding");
+
+    rewriter.replaceOp(op, op.getInput());
----------------
lhutton1 wrote:

Argh, thanks! Yes, I'm fairly sure I realised this at the time of writing, but forgot when taking a look just now. I've added it back and added a comment as a reminder

https://github.com/llvm/llvm-project/pull/203571