[llvm] [X86] Avoid repeated hash lookups (NFC) (PR #110077)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-backend-x86

Author: Kazu Hirata (kazutakahirata)

<details>
<summary>Changes</summary>



---
Full diff: https://github.com/llvm/llvm-project/pull/110077.diff


1 Files Affected:

- (modified) llvm/lib/Target/X86/X86ISelLowering.cpp (+4-4) 


``````````diff
diff --git a/llvm/lib/Target/X86/X86ISelLowering.cpp b/llvm/lib/Target/X86/X86ISelLowering.cpp
index d9eedfdfd53a43..73f7f52846f625 100644
--- a/llvm/lib/Target/X86/X86ISelLowering.cpp
+++ b/llvm/lib/Target/X86/X86ISelLowering.cpp
@@ -35451,11 +35451,11 @@ static MachineInstrBuilder createPHIsForCMOVsInSinkBB(
     if (MIIt->getOperand(3).getImm() == OppCC)
       std::swap(Op1Reg, Op2Reg);
 
-    if (RegRewriteTable.contains(Op1Reg))
-      Op1Reg = RegRewriteTable[Op1Reg].first;
+    if (auto It = RegRewriteTable.find(Op1Reg); It != RegRewriteTable.end())
+      Op1Reg = It->second.first;
 
-    if (RegRewriteTable.contains(Op2Reg))
-      Op2Reg = RegRewriteTable[Op2Reg].second;
+    if (auto It = RegRewriteTable.find(Op2Reg); It != RegRewriteTable.end())
+      Op2Reg = It->second.second;
 
     MIB =
         BuildMI(*SinkMBB, SinkInsertionPoint, MIMD, TII->get(X86::PHI), DestReg)

``````````

</details>


https://github.com/llvm/llvm-project/pull/110077