[llvm] [llvm-profgen] Avoid repeated hash lookups (NFC) (PR #130466)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-pgo

Author: Kazu Hirata (kazutakahirata)

<details>
<summary>Changes</summary>



---
Full diff: https://github.com/llvm/llvm-project/pull/130466.diff


1 Files Affected:

- (modified) llvm/tools/llvm-profgen/MissingFrameInferrer.cpp (+3-3) 


``````````diff
diff --git a/llvm/tools/llvm-profgen/MissingFrameInferrer.cpp b/llvm/tools/llvm-profgen/MissingFrameInferrer.cpp
index ac88fced9159c..edfe8979c7121 100644
--- a/llvm/tools/llvm-profgen/MissingFrameInferrer.cpp
+++ b/llvm/tools/llvm-profgen/MissingFrameInferrer.cpp
@@ -165,14 +165,14 @@ uint64_t MissingFrameInferrer::computeUniqueTailCallPath(
   if (CurSearchingDepth == MaximumSearchDepth)
     return 0;
 
-
-  if (!FuncToTailCallMap.count(From))
+  auto It = FuncToTailCallMap.find(From);
+  if (It == FuncToTailCallMap.end())
     return 0;
 
   CurSearchingDepth++;
   Visiting.insert(From);
   uint64_t NumPaths = 0;
-  for (auto TailCall : FuncToTailCallMap[From]) {
+  for (auto TailCall : It->second) {
     NumPaths += computeUniqueTailCallPath(TailCall, To, Path);
     // Stop analyzing the remaining if we are already seeing more than one
     // reachable paths.

``````````

</details>


https://github.com/llvm/llvm-project/pull/130466