[llvm] [ExecutionEngine] Avoid repeated hash lookups (NFC) (PR #129822)

[Kazu Hirata via llvm-commits]

https://github.com/kazutakahirata created https://github.com/llvm/llvm-project/pull/129822

None

>From 7c930fda899c5bb1a89d29afd3590dffe726b737 Mon Sep 17 00:00:00 2001
From: Kazu Hirata <kazu at google.com>
Date: Tue, 4 Mar 2025 07:31:17 -0800
Subject: [PATCH] [ExecutionEngine] Avoid repeated hash lookups (NFC)

---
 llvm/lib/ExecutionEngine/JITLink/COFF_x86_64.cpp | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/llvm/lib/ExecutionEngine/JITLink/COFF_x86_64.cpp b/llvm/lib/ExecutionEngine/JITLink/COFF_x86_64.cpp
index 8ceb08051e423..30718bae15565 100644
--- a/llvm/lib/ExecutionEngine/JITLink/COFF_x86_64.cpp
+++ b/llvm/lib/ExecutionEngine/JITLink/COFF_x86_64.cpp
@@ -235,12 +235,12 @@ class COFFLinkGraphLowering_x86_64 {
 
 private:
   orc::ExecutorAddr getSectionStart(Section &Sec) {
-    if (!SectionStartCache.count(&Sec)) {
+    auto [It, Inserted] = SectionStartCache.try_emplace(&Sec);
+    if (Inserted) {
       SectionRange Range(Sec);
-      SectionStartCache[&Sec] = Range.getStart();
-      return Range.getStart();
+      It->second = Range.getStart();
     }
-    return SectionStartCache[&Sec];
+    return It->second;
   }
 
   GetImageBaseSymbol GetImageBase;