[clang] [Sema] Avoid repeated hash lookups (NFC) (PR #112156)

[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/112156.diff


1 Files Affected:

- (modified) clang/lib/Sema/SemaAttr.cpp (+3-5) 


``````````diff
diff --git a/clang/lib/Sema/SemaAttr.cpp b/clang/lib/Sema/SemaAttr.cpp
index cf2a5a622a3a4d..68a8dfaf1f6183 100644
--- a/clang/lib/Sema/SemaAttr.cpp
+++ b/clang/lib/Sema/SemaAttr.cpp
@@ -750,12 +750,10 @@ bool Sema::UnifySection(StringRef SectionName, int SectionFlags,
   if (auto A = Decl->getAttr<SectionAttr>())
     if (A->isImplicit())
       PragmaLocation = A->getLocation();
-  auto SectionIt = Context.SectionInfos.find(SectionName);
-  if (SectionIt == Context.SectionInfos.end()) {
-    Context.SectionInfos[SectionName] =
-        ASTContext::SectionInfo(Decl, PragmaLocation, SectionFlags);
+  auto [SectionIt, Inserted] = Context.SectionInfos.try_emplace(
+      SectionName, Decl, PragmaLocation, SectionFlags);
+  if (Inserted)
     return false;
-  }
   // A pre-declared section takes precedence w/o diagnostic.
   const auto &Section = SectionIt->second;
   if (Section.SectionFlags == SectionFlags ||

``````````

</details>


https://github.com/llvm/llvm-project/pull/112156