[clang] [ByteCode] Avoid repeated hash lookups (NFC) (PR #126379)

[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/126379.diff


1 Files Affected:

- (modified) clang/lib/AST/ByteCode/Program.cpp (+5-7) 


``````````diff
diff --git a/clang/lib/AST/ByteCode/Program.cpp b/clang/lib/AST/ByteCode/Program.cpp
index e0b86d46428a26..833c9ef88d770f 100644
--- a/clang/lib/AST/ByteCode/Program.cpp
+++ b/clang/lib/AST/ByteCode/Program.cpp
@@ -18,14 +18,12 @@ using namespace clang;
 using namespace clang::interp;
 
 unsigned Program::getOrCreateNativePointer(const void *Ptr) {
-  auto It = NativePointerIndices.find(Ptr);
-  if (It != NativePointerIndices.end())
-    return It->second;
+  auto [It, Inserted] =
+      NativePointerIndices.try_emplace(Ptr, NativePointers.size());
+  if (Inserted)
+    NativePointers.push_back(Ptr);
 
-  unsigned Idx = NativePointers.size();
-  NativePointers.push_back(Ptr);
-  NativePointerIndices[Ptr] = Idx;
-  return Idx;
+  return It->second;
 }
 
 const void *Program::getNativePointer(unsigned Idx) {

``````````

</details>


https://github.com/llvm/llvm-project/pull/126379