[clang] [CodeGen] Avoid repeated hash lookups (NFC) (PR #107759)

[via cfe-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->
@llvm/pr-subscribers-clang

@llvm/pr-subscribers-clang-codegen

Author: Kazu Hirata (kazutakahirata)

<details>
<summary>Changes</summary>



---
Full diff: https://github.com/llvm/llvm-project/pull/107759.diff


1 Files Affected:

- (modified) clang/lib/CodeGen/CoverageMappingGen.cpp (+1-6) 


``````````diff
diff --git a/clang/lib/CodeGen/CoverageMappingGen.cpp b/clang/lib/CodeGen/CoverageMappingGen.cpp
index 67a9caf8b4ec4b..07015834bc84f3 100644
--- a/clang/lib/CodeGen/CoverageMappingGen.cpp
+++ b/clang/lib/CodeGen/CoverageMappingGen.cpp
@@ -2595,12 +2595,7 @@ void CoverageMappingModuleGen::emit() {
 }
 
 unsigned CoverageMappingModuleGen::getFileID(FileEntryRef File) {
-  auto It = FileEntries.find(File);
-  if (It != FileEntries.end())
-    return It->second;
-  unsigned FileID = FileEntries.size() + 1;
-  FileEntries.insert(std::make_pair(File, FileID));
-  return FileID;
+  return FileEntries.try_emplace(File, FileEntries.size() + 1).first->second;
 }
 
 void CoverageMappingGen::emitCounterMapping(const Decl *D,

``````````

</details>


https://github.com/llvm/llvm-project/pull/107759