================
@@ -583,3 +624,283 @@ Region *mlir::getEnclosingRepetitiveRegion(Value value) {
LDBG() << "No enclosing repetitive region found for value";
return nullptr;
}
+
+/// Is a defined before b?
+static bool isDefinedBefore(Value a, Value b) {
----------------
matthias-springer wrote:
I have to measure this... I'm trying to keep this as lightweight as possible.
(Even at the expense of potentially returning `false` in cases where `true`
would be correct.) This function is called from the canonicalization pattern
and computing an analysis (`DominanceInfo`) in there sounds too expensive.
https://github.com/llvm/llvm-project/pull/174094
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