[clang] [Sema] Avoid repeated hash lookups (NFC) (PR #131065)

[via cfe-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang

Author: Kazu Hirata (kazutakahirata)

<details>
<summary>Changes</summary>



---
Full diff: https://github.com/llvm/llvm-project/pull/131065.diff


1 Files Affected:

- (modified) clang/lib/Sema/SemaOpenACCClause.cpp (+3-3) 


``````````diff
diff --git a/clang/lib/Sema/SemaOpenACCClause.cpp b/clang/lib/Sema/SemaOpenACCClause.cpp
index ad54e2bbe9495..33c2d5d6c8c4c 100644
--- a/clang/lib/Sema/SemaOpenACCClause.cpp
+++ b/clang/lib/Sema/SemaOpenACCClause.cpp
@@ -2468,14 +2468,14 @@ bool SemaOpenACC::CheckDeclareClause(SemaOpenACC::OpenACCParsedClause &Clause) {
       // directives for a function, subroutine, program, or module.
 
       if (CurDecl) {
-        auto Itr = DeclareVarReferences.find(CurDecl);
-        if (Itr != DeclareVarReferences.end()) {
+        auto [Itr, Inserted] = DeclareVarReferences.try_emplace(CurDecl);
+        if (!Inserted) {
           Diag(VarExpr->getBeginLoc(), diag::err_acc_multiple_references)
               << Clause.getClauseKind();
           Diag(Itr->second, diag::note_acc_previous_reference);
           continue;
         } else {
-          DeclareVarReferences[CurDecl] = VarExpr->getBeginLoc();
+          Itr->second = VarExpr->getBeginLoc();
         }
       }
     }

``````````

</details>


https://github.com/llvm/llvm-project/pull/131065