[Dialect] Avoid repeated hash lookups (NFC)

[kazutakahirata]

No description provided.

[llvmbot]

@llvm/pr-subscribers-mlir

@llvm/pr-subscribers-mlir-bufferization

Author: Kazu Hirata (kazutakahirata)

Changes

---

Full diff: https://github.com/llvm/llvm-project/pull/108137.diff

1 Files Affected:

• (modified) mlir/lib/Dialect/Bufferization/IR/BufferizableOpInterface.cpp (+1-2)

diff --git a/mlir/lib/Dialect/Bufferization/IR/BufferizableOpInterface.cpp b/mlir/lib/Dialect/Bufferization/IR/BufferizableOpInterface.cpp
index d51d63f243ea0c..85604eef2f2830 100644
--- a/mlir/lib/Dialect/Bufferization/IR/BufferizableOpInterface.cpp
+++ b/mlir/lib/Dialect/Bufferization/IR/BufferizableOpInterface.cpp
@@ -465,9 +465,8 @@ bool AnalysisState::isValueRead(Value value) const {
 
   while (!workingSet.empty()) {
     OpOperand *uMaybeReading = workingSet.pop_back_val();
-    if (visited.contains(uMaybeReading))
+    if (!visited.insert(uMaybeReading).second)
       continue;
-    visited.insert(uMaybeReading);
 
     // Skip over all ops that neither read nor write (but create an alias).
     if (bufferizesToAliasOnly(*uMaybeReading))