[llvm] [CodeGen] Avoid repeated hash lookups (NFC) (PR #123287)

[Kazu Hirata via llvm-commits]

https://github.com/kazutakahirata created https://github.com/llvm/llvm-project/pull/123287

None

>From 0ace4579aa089ce20f3c64ceba8dd201afabe829 Mon Sep 17 00:00:00 2001
From: Kazu Hirata <kazu at google.com>
Date: Thu, 16 Jan 2025 09:55:18 -0800
Subject: [PATCH] [CodeGen] Avoid repeated hash lookups (NFC)

---
 llvm/lib/CodeGen/AssignmentTrackingAnalysis.cpp | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/llvm/lib/CodeGen/AssignmentTrackingAnalysis.cpp b/llvm/lib/CodeGen/AssignmentTrackingAnalysis.cpp
index a465f52bfd5936..dbc724629d3bec 100644
--- a/llvm/lib/CodeGen/AssignmentTrackingAnalysis.cpp
+++ b/llvm/lib/CodeGen/AssignmentTrackingAnalysis.cpp
@@ -230,9 +230,10 @@ void FunctionVarLocs::init(FunctionVarLocsBuilder &Builder) {
     for (const DbgVariableRecord &DVR : filterDbgVars(I->getDbgRecordRange())) {
       // Even though DVR defines a variable location, VarLocsBeforeInst can
       // still be empty if that VarLoc was redundant.
-      if (!Builder.VarLocsBeforeInst.count(&DVR))
+      auto It = Builder.VarLocsBeforeInst.find(&DVR);
+      if (It == Builder.VarLocsBeforeInst.end())
         continue;
-      for (const VarLocInfo &VarLoc : Builder.VarLocsBeforeInst[&DVR])
+      for (const VarLocInfo &VarLoc : It->second)
         VarLocRecords.emplace_back(VarLoc);
     }
     for (const VarLocInfo &VarLoc : P.second)