[llvm] [Passes] Avoid repeated hash lookups (NFC) (PR #128828)

[Kazu Hirata via llvm-commits]

https://github.com/kazutakahirata created https://github.com/llvm/llvm-project/pull/128828

None

>From 1530dfc7698dac568e64d844c3cf1aa9769b4d3a Mon Sep 17 00:00:00 2001
From: Kazu Hirata <kazu at google.com>
Date: Tue, 25 Feb 2025 09:11:05 -0800
Subject: [PATCH] [Passes] Avoid repeated hash lookups (NFC)

---
 llvm/lib/Passes/StandardInstrumentations.cpp | 9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

diff --git a/llvm/lib/Passes/StandardInstrumentations.cpp b/llvm/lib/Passes/StandardInstrumentations.cpp
index b766517e68eba..5d4f9ac1496fc 100644
--- a/llvm/lib/Passes/StandardInstrumentations.cpp
+++ b/llvm/lib/Passes/StandardInstrumentations.cpp
@@ -2022,12 +2022,9 @@ DotCfgDiff::DotCfgDiff(StringRef Title, const FuncDataT<DCData> &Before,
          Sink != E; ++Sink) {
       std::string Key = (Label + " " + Sink->getKey().str()).str() + " " +
                         BD.getData().getSuccessorLabel(Sink->getKey()).str();
-      unsigned C = EdgesMap.count(Key);
-      if (C == 0)
-        EdgesMap.insert({Key, AfterColour});
-      else {
-        EdgesMap[Key] = CommonColour;
-      }
+      auto [It, Inserted] = EdgesMap.try_emplace(Key, AfterColour);
+      if (!Inserted)
+        It->second = CommonColour;
     }
   }