[llvm] [SelectionDAG] Avoid repeated hash lookups (NFC) (PR #123697)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-llvm-selectiondag

Author: Kazu Hirata (kazutakahirata)

<details>
<summary>Changes</summary>



---
Full diff: https://github.com/llvm/llvm-project/pull/123697.diff


1 Files Affected:

- (modified) llvm/lib/CodeGen/SelectionDAG/StatepointLowering.cpp (+3-2) 


``````````diff
diff --git a/llvm/lib/CodeGen/SelectionDAG/StatepointLowering.cpp b/llvm/lib/CodeGen/SelectionDAG/StatepointLowering.cpp
index a838003c34dfb0..987ea826f782e7 100644
--- a/llvm/lib/CodeGen/SelectionDAG/StatepointLowering.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/StatepointLowering.cpp
@@ -871,10 +871,11 @@ SDValue SelectionDAGBuilder::LowerAsSTATEPOINT(
   for (const auto *Relocate : SI.GCRelocates) {
     Value *Derived = Relocate->getDerivedPtr();
     SDValue SD = getValue(Derived);
-    if (!LowerAsVReg.count(SD))
+    auto It = LowerAsVReg.find(SD);
+    if (It == LowerAsVReg.end())
       continue;
 
-    SDValue Relocated = SDValue(StatepointMCNode, LowerAsVReg[SD]);
+    SDValue Relocated = SDValue(StatepointMCNode, It->second);
 
     // Handle local relocate. Note that different relocates might
     // map to the same SDValue.

``````````

</details>


https://github.com/llvm/llvm-project/pull/123697