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

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-llvm-analysis

Author: Kazu Hirata (kazutakahirata)

<details>
<summary>Changes</summary>



---
Full diff: https://github.com/llvm/llvm-project/pull/127024.diff


1 Files Affected:

- (modified) llvm/lib/Analysis/PhiValues.cpp (+4-2) 


``````````diff
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));
     }

``````````

</details>


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