[llvm] [Scalar] Avoid repeated hash lookups (NFC) (PR #130463)

[Kazu Hirata via llvm-commits]

https://github.com/kazutakahirata created https://github.com/llvm/llvm-project/pull/130463

None

>From c9cf0d8b3c7a6d039c5995501193b10a62d4171c Mon Sep 17 00:00:00 2001
From: Kazu Hirata <kazu at google.com>
Date: Sat, 8 Mar 2025 01:09:04 -0800
Subject: [PATCH] [Scalar] Avoid repeated hash lookups (NFC)

---
 llvm/lib/Transforms/Scalar/StructurizeCFG.cpp | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/llvm/lib/Transforms/Scalar/StructurizeCFG.cpp b/llvm/lib/Transforms/Scalar/StructurizeCFG.cpp
index b1f742b838f2a..89a2a7ac9be3f 100644
--- a/llvm/lib/Transforms/Scalar/StructurizeCFG.cpp
+++ b/llvm/lib/Transforms/Scalar/StructurizeCFG.cpp
@@ -852,10 +852,11 @@ void StructurizeCFG::setPhiValues() {
     BasicBlock *To = AddedPhi.first;
     const BBVector &From = AddedPhi.second;
 
-    if (!DeletedPhis.count(To))
+    auto It = DeletedPhis.find(To);
+    if (It == DeletedPhis.end())
       continue;
 
-    PhiMap &Map = DeletedPhis[To];
+    PhiMap &Map = It->second;
     SmallVector<BasicBlock *> &UndefBlks = UndefBlksMap[To];
     for (const auto &[Phi, Incoming] : Map) {
       Value *Undef = UndefValue::get(Phi->getType());