masahi commented on a change in pull request #10663:
URL: https://github.com/apache/tvm/pull/10663#discussion_r829398822
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File path: src/tir/transforms/common_subexpr_elim_tools.cc
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@@ -748,8 +748,26 @@ std::vector<std::pair<PrimExpr, size_t>>
SyntacticToSemanticComputations(
// We do this reservation even if it might reserve slightly more space than
is needed in the end
result.reserve(table.size());
- // For each element in the hashtable
+ // Traverse through keys in a sorted order to maintain deterministic behavior
+ // We do this by comparing the string repr of each PrimExpr to get a
determinstic ordering
+ std::vector<PrimExpr> table_keys;
+ table_keys.reserve(table.size());
for (auto elem : table) {
+ table_keys.push_back(elem.first);
+ }
+ sort(table_keys.begin(), table_keys.end(), [](PrimExpr a, PrimExpr b) {
+ std::stringstream a_stream;
+ std::stringstream b_stream;
+ a_stream << a;
+ b_stream << b;
+ return a_stream.str().compare(b_stream.str()) < 0;
+ });
+
+ // For each element in the hashtable
+ for (PrimExpr key : table_keys) {
+ size_t value = table.find(key)->second;
Review comment:
Actually, if you have a sorted `std::vector<std::pair<PrimExpr,
size_t>>` beforehand, this transform can be done in a one pass, rather than the
current O(N^2) implementation. Just loop through each input pair and count
until `EquivalentTerms` returns false etc.
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