[IPO] Avoid repeated hash lookups (NFC)

[kazutakahirata]

No description provided.

[llvmbot]

@llvm/pr-subscribers-llvm-transforms

@llvm/pr-subscribers-pgo

Author: Kazu Hirata (kazutakahirata)

Changes

---

Full diff: https://github.com/llvm/llvm-project/pull/130708.diff

1 Files Affected:

• (modified) llvm/lib/Transforms/IPO/SampleProfileProbe.cpp (+3-2)

diff --git a/llvm/lib/Transforms/IPO/SampleProfileProbe.cpp b/llvm/lib/Transforms/IPO/SampleProfileProbe.cpp
index ec2594b0d9dc1..e40b2cdc37f70 100644
--- a/llvm/lib/Transforms/IPO/SampleProfileProbe.cpp
+++ b/llvm/lib/Transforms/IPO/SampleProfileProbe.cpp
@@ -148,7 +148,8 @@ void PseudoProbeVerifier::verifyProbeFactors(
   auto &PrevProbeFactors = FunctionProbeFactors[F->getName()];
   for (const auto &I : ProbeFactors) {
     float CurProbeFactor = I.second;
-    if (PrevProbeFactors.count(I.first)) {
+    auto [It, Inserted] = PrevProbeFactors.try_emplace(I.first);
+    if (!Inserted) {
       float PrevProbeFactor = PrevProbeFactors[I.first];
       if (std::abs(CurProbeFactor - PrevProbeFactor) >
           DistributionFactorVariance) {
@@ -163,7 +164,7 @@ void PseudoProbeVerifier::verifyProbeFactors(
     }
 
     // Update
-    PrevProbeFactors[I.first] = I.second;
+    It->second = I.second;
   }
 }