[IR] Avoid repeated hash lookups (NFC)

[kazutakahirata]

No description provided.

[llvmbot]

@llvm/pr-subscribers-llvm-ir

Author: Kazu Hirata (kazutakahirata)

Changes

---

Full diff: https://github.com/llvm/llvm-project/pull/112469.diff

1 Files Affected:

• (modified) llvm/lib/IR/LegacyPassManager.cpp (+3-5)

diff --git a/llvm/lib/IR/LegacyPassManager.cpp b/llvm/lib/IR/LegacyPassManager.cpp
index 96e2f1d7908ba6..ce6f6c733f4bcc 100644
--- a/llvm/lib/IR/LegacyPassManager.cpp
+++ b/llvm/lib/IR/LegacyPassManager.cpp
@@ -104,15 +104,13 @@ void PMDataManager::emitInstrCountChangedRemark(
       [&FunctionToInstrCount](Function &MaybeChangedFn) {
         // Update the total module count.
         unsigned FnSize = MaybeChangedFn.getInstructionCount();
-        auto It = FunctionToInstrCount.find(MaybeChangedFn.getName());
 
         // If we created a new function, then we need to add it to the map and
         // say that it changed from 0 instructions to FnSize.
-        if (It == FunctionToInstrCount.end()) {
-          FunctionToInstrCount[MaybeChangedFn.getName()] =
-              std::pair<unsigned, unsigned>(0, FnSize);
+        auto [It, Inserted] = FunctionToInstrCount.try_emplace(
+            MaybeChangedFn.getName(), 0, FnSize);
+        if (Inserted)
           return;
-        }
         // Insert the new function size into the second member of the pair. This
         // tells us whether or not this function changed in size.
         It->second.second = FnSize;

[nikic]

LGTM