[llvm] [Transforms] Avoid repeated hash lookups (NFC) (PR #131554)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-llvm-transforms

Author: Kazu Hirata (kazutakahirata)

<details>
<summary>Changes</summary>



---
Full diff: https://github.com/llvm/llvm-project/pull/131554.diff


1 Files Affected:

- (modified) llvm/lib/Transforms/IPO/AttributorAttributes.cpp (+2-2) 


``````````diff
diff --git a/llvm/lib/Transforms/IPO/AttributorAttributes.cpp b/llvm/lib/Transforms/IPO/AttributorAttributes.cpp
index 60aa758917b0b..4b7902ff502d3 100644
--- a/llvm/lib/Transforms/IPO/AttributorAttributes.cpp
+++ b/llvm/lib/Transforms/IPO/AttributorAttributes.cpp
@@ -1679,8 +1679,8 @@ ChangeStatus AAPointerInfoFloating::updateImpl(Attributor &A) {
     if (auto *PHI = dyn_cast<PHINode>(Usr)) {
       // Note the order here, the Usr access might change the map, CurPtr is
       // already in it though.
-      bool IsFirstPHIUser = !OffsetInfoMap.count(PHI);
-      auto &UsrOI = OffsetInfoMap[PHI];
+      auto [PhiIt, IsFirstPHIUser] = OffsetInfoMap.try_emplace(PHI);
+      auto &UsrOI = PhiIt->second;
       auto &PtrOI = OffsetInfoMap[CurPtr];
 
       // Check if the PHI operand has already an unknown offset as we can't

``````````

</details>


https://github.com/llvm/llvm-project/pull/131554