[GitHub] [tvm] leiwen83 commented on a diff in pull request #13294: Enhancement for simplify_expr

[GitBox <gi...@apache.org>]

leiwen83 commented on code in PR #13294:
URL: https://github.com/apache/tvm/pull/13294#discussion_r1014595606


##########
src/relay/transforms/simplify_expr.cc:
##########
@@ -878,6 +932,33 @@ class SimplifyAdd : public DFPatternRewrite {
   DFPattern y_;
 };
 
+/*! \brief Simplifying x/c to x*(1/c) */
+class SimplifyDivide : public DFPatternRewrite {
+ public:
+  SimplifyDivide() {
+    x_ = IsWildcard();
+    c_ = IsConstant();
+    pattern_ = IsOp("divide")({x_, c_});
+  }
+
+  Expr Callback(const Expr& pre, const Expr& post,
+                const Map<DFPattern, Array<Expr>>& node_map) const override {
+    Type pre_type = pre->checked_type_;
+    auto dtype = pre_type.as<TensorTypeNode>()->dtype;
+    auto x = node_map[x_][0];
+    auto c = node_map[c_][0];
+
+    Expr one;
+    one = MakeConstantScalar(dtype, 1);

Review Comment:
   fixed



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