[Analysis] Avoid repeated hash lookups (NFC)

[kazutakahirata]

No description provided.

[llvmbot]

@llvm/pr-subscribers-llvm-analysis

Author: Kazu Hirata (kazutakahirata)

Changes

---

Full diff: https://github.com/llvm/llvm-project/pull/129417.diff

1 Files Affected:

• (modified) llvm/lib/Analysis/ProfileSummaryInfo.cpp (+4-5)

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;
 }