mbrookhart commented on a change in pull request #7374:
URL: https://github.com/apache/tvm/pull/7374#discussion_r568310278
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File path: src/relay/transforms/type_infer.cc
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@@ -603,7 +611,21 @@ class TypeInferencer::Resolver : public MixedModeMutator,
PatternMutator {
Expr Rewrite_(const CallNode* op, const Expr& post) final { return
AttachCheckedType(op, post); }
- Expr VisitExpr_(const LetNode* op) final { return AttachCheckedType(op); }
+ Expr VisitExpr_(const LetNode* op) final {
+ auto pre_visit = [this](const LetNode* op) {
+ this->VisitExpr(op->var);
+ this->VisitExpr(op->value);
+ };
+ auto post_visit = [this](const LetNode* op) {
+ Expr expr = GetRef<Expr>(op);
+ Var var = Downcast<Var>(this->VisitExpr(op->var));
+ Expr value = this->VisitExpr(op->value);
Review comment:
We just need to pull the values out of the cache. Instead of maintaining
a cache shared by the two lambdas, I'm using the memorization cache in the
Mutator. The second time visit is called, it will short circuit and return the
previously computed value.
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