[llvm] [SystemZ] Avoid repeated hash lookups (NFC) (PR #126005)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-backend-systemz

Author: Kazu Hirata (kazutakahirata)

<details>
<summary>Changes</summary>



---
Full diff: https://github.com/llvm/llvm-project/pull/126005.diff


1 Files Affected:

- (modified) llvm/lib/Target/SystemZ/SystemZISelLowering.cpp (+3-2) 


``````````diff
diff --git a/llvm/lib/Target/SystemZ/SystemZISelLowering.cpp b/llvm/lib/Target/SystemZ/SystemZISelLowering.cpp
index 1fb31c26e20d3c1..a1e02c0c32b61dd 100644
--- a/llvm/lib/Target/SystemZ/SystemZISelLowering.cpp
+++ b/llvm/lib/Target/SystemZ/SystemZISelLowering.cpp
@@ -6173,8 +6173,9 @@ SystemZTargetLowering::buildVector(SelectionDAG &DAG, const SDLoc &DL, EVT VT,
     for (unsigned I = 0; I < NumElements; ++I)
       if (isVectorElementLoad(Elems[I])) {
         SDNode *Ld = Elems[I].getNode();
-        UseCounts[Ld]++;
-        if (LoadMaxUses == nullptr || UseCounts[LoadMaxUses] < UseCounts[Ld])
+        auto &Count = UseCounts[Ld];
+        ++Count;
+        if (LoadMaxUses == nullptr || UseCounts[LoadMaxUses] < Count)
           LoadMaxUses = Ld;
       }
     if (LoadMaxUses != nullptr) {

``````````

</details>


https://github.com/llvm/llvm-project/pull/126005