From 99451af85d7a4d160550194195b5ebbd5d250940 Mon Sep 17 00:00:00 2001
From: Kazu Hirata <kazu@google.com>
Date: Sat, 1 Mar 2025 08:21:39 -0800
Subject: [PATCH] [Analysis] Avoid repeated hash lookups (NFC)

---
 llvm/lib/Analysis/ProfileSummaryInfo.cpp | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/llvm/lib/Analysis/ProfileSummaryInfo.cpp b/llvm/lib/Analysis/ProfileSummaryInfo.cpp
index fdad14571dfe4..1a6d2006202bc 100644
--- a/llvm/lib/Analysis/ProfileSummaryInfo.cpp
+++ b/llvm/lib/Analysis/ProfileSummaryInfo.cpp
@@ -141,15 +141,14 @@ std::optional<uint64_t>
 ProfileSummaryInfo::computeThreshold(int PercentileCutoff) const {
   if (!hasProfileSummary())
     return std::nullopt;
-  auto iter = ThresholdCache.find(PercentileCutoff);
-  if (iter != ThresholdCache.end()) {
-    return iter->second;
-  }
+  auto [Iter, Inserted] = ThresholdCache.try_emplace(PercentileCutoff);
+  if (!Inserted)
+    return Iter->second;
   auto &DetailedSummary = Summary->getDetailedSummary();
   auto &Entry = ProfileSummaryBuilder::getEntryForPercentile(DetailedSummary,
                                                              PercentileCutoff);
   uint64_t CountThreshold = Entry.MinCount;
-  ThresholdCache[PercentileCutoff] = CountThreshold;
+  Iter->second = CountThreshold;
   return CountThreshold;
 }