[llvm] [Analysis] Avoid repeated hash lookups (NFC) (PR #127024)

[Kazu Hirata via llvm-commits]

https://github.com/kazutakahirata created https://github.com/llvm/llvm-project/pull/127024

None

>From 91f06548f4db247f4c80e3d0cc53a140b7429ef1 Mon Sep 17 00:00:00 2001
From: Kazu Hirata <kazu at google.com>
Date: Wed, 12 Feb 2025 08:59:33 -0800
Subject: [PATCH] [Analysis] Avoid repeated hash lookups (NFC)

---
 llvm/lib/Analysis/PhiValues.cpp | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/llvm/lib/Analysis/PhiValues.cpp b/llvm/lib/Analysis/PhiValues.cpp
index 656a17e9dc30e..1e0dac35f9ef3 100644
--- a/llvm/lib/Analysis/PhiValues.cpp
+++ b/llvm/lib/Analysis/PhiValues.cpp
@@ -67,8 +67,10 @@ void PhiValues::processPhi(const PHINode *Phi,
       }
       // If the phi did not become part of a component then this phi and that
       // phi are part of the same component, so adjust the depth number.
-      if (!ReachableMap.count(OpDepthNumber))
-        DepthMap[Phi] = std::min(DepthMap[Phi], OpDepthNumber);
+      if (!ReachableMap.count(OpDepthNumber)) {
+        unsigned &Depth = DepthMap[Phi];
+        Depth = std::min(Depth, OpDepthNumber);
+      }
     } else {
       TrackedValues.insert(PhiValuesCallbackVH(PhiOp, this));
     }