[llvm] [TableGen] Avoid repeated hash lookups (NFC) (PR #126433)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-tablegen

Author: Kazu Hirata (kazutakahirata)

<details>
<summary>Changes</summary>



---
Full diff: https://github.com/llvm/llvm-project/pull/126433.diff


1 Files Affected:

- (modified) llvm/utils/TableGen/Common/CodeGenSchedule.cpp (+3-3) 


``````````diff
diff --git a/llvm/utils/TableGen/Common/CodeGenSchedule.cpp b/llvm/utils/TableGen/Common/CodeGenSchedule.cpp
index e84b4fd77a6c1fe..8e8b3196c91b01d 100644
--- a/llvm/utils/TableGen/Common/CodeGenSchedule.cpp
+++ b/llvm/utils/TableGen/Common/CodeGenSchedule.cpp
@@ -413,9 +413,9 @@ void CodeGenSchedModels::collectSTIPredicates() {
   for (const Record *R : Records.getAllDerivedDefinitions("STIPredicate")) {
     const Record *Decl = R->getValueAsDef("Declaration");
 
-    const auto It = Decl2Index.find(Decl);
-    if (It == Decl2Index.end()) {
-      Decl2Index[Decl] = STIPredicates.size();
+    const auto [It, Inserted] =
+        Decl2Index.try_emplace(Decl, STIPredicates.size());
+    if (Inserted) {
       STIPredicateFunction Predicate(Decl);
       Predicate.addDefinition(R);
       STIPredicates.emplace_back(std::move(Predicate));

``````````

</details>


https://github.com/llvm/llvm-project/pull/126433