[Mlir-commits] [mlir] [Presburger] Avoid repeated hash lookups (NFC) (PR #107426)

[llvmlistbot at llvm.org]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-mlir-presburger

Author: Kazu Hirata (kazutakahirata)

<details>
<summary>Changes</summary>



---
Full diff: https://github.com/llvm/llvm-project/pull/107426.diff


1 Files Affected:

- (modified) mlir/lib/Analysis/Presburger/IntegerRelation.cpp (+1-3) 


``````````diff
diff --git a/mlir/lib/Analysis/Presburger/IntegerRelation.cpp b/mlir/lib/Analysis/Presburger/IntegerRelation.cpp
index 87204d2100713b..94af81f955e5a5 100644
--- a/mlir/lib/Analysis/Presburger/IntegerRelation.cpp
+++ b/mlir/lib/Analysis/Presburger/IntegerRelation.cpp
@@ -2367,10 +2367,8 @@ bool IntegerRelation::removeDuplicateConstraints() {
   hashTable.insert({row, 0});
   for (unsigned k = 1; k < ineqs; ++k) {
     row = getInequality(k).drop_back();
-    if (!hashTable.contains(row)) {
-      hashTable.insert({row, k});
+    if (hashTable.try_emplace(row, k).second)
       continue;
-    }
 
     // For identical cases, keep only the smaller part of the constant term.
     unsigned l = hashTable[row];

``````````

</details>


https://github.com/llvm/llvm-project/pull/107426