[llvm] [SystemZ] Avoid repeated hash lookups (NFC) (PR #112072)

[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/112072.diff


1 Files Affected:

- (modified) llvm/lib/Target/SystemZ/SystemZISelLowering.cpp (+4-4) 


``````````diff
diff --git a/llvm/lib/Target/SystemZ/SystemZISelLowering.cpp b/llvm/lib/Target/SystemZ/SystemZISelLowering.cpp
index abf414fd1ffb71..c7626434efac67 100644
--- a/llvm/lib/Target/SystemZ/SystemZISelLowering.cpp
+++ b/llvm/lib/Target/SystemZ/SystemZISelLowering.cpp
@@ -8340,11 +8340,11 @@ static void createPHIsForSelects(SmallVector<MachineInstr*, 8> &Selects,
     if (MI->getOperand(4).getImm() == (CCValid ^ CCMask))
       std::swap(TrueReg, FalseReg);
 
-    if (RegRewriteTable.contains(TrueReg))
-      TrueReg = RegRewriteTable[TrueReg].first;
+    if (auto It = RegRewriteTable.find(TrueReg); It != RegRewriteTable.end())
+      TrueReg = It->second.first;
 
-    if (RegRewriteTable.contains(FalseReg))
-      FalseReg = RegRewriteTable[FalseReg].second;
+    if (auto It = RegRewriteTable.find(FalseReg); It != RegRewriteTable.end())
+      FalseReg = It->second.second;
 
     DebugLoc DL = MI->getDebugLoc();
     BuildMI(*SinkMBB, SinkInsertionPoint, DL, TII->get(SystemZ::PHI), DestReg)

``````````

</details>


https://github.com/llvm/llvm-project/pull/112072