[CodeGen] Avoid repeated hash lookups (NFC)

[kazutakahirata]

No description provided.

[llvmbot]

@llvm/pr-subscribers-debuginfo

Author: Kazu Hirata (kazutakahirata)

Changes

---

Full diff: https://github.com/llvm/llvm-project/pull/129465.diff

1 Files Affected:

• (modified) llvm/lib/CodeGen/LiveDebugValues/VarLocBasedImpl.cpp (+3-2)

diff --git a/llvm/lib/CodeGen/LiveDebugValues/VarLocBasedImpl.cpp b/llvm/lib/CodeGen/LiveDebugValues/VarLocBasedImpl.cpp
index 94e7f1b734fd1..a76eb164bed23 100644
--- a/llvm/lib/CodeGen/LiveDebugValues/VarLocBasedImpl.cpp
+++ b/llvm/lib/CodeGen/LiveDebugValues/VarLocBasedImpl.cpp
@@ -1361,8 +1361,9 @@ void VarLocBasedLDV::removeEntryValue(const MachineInstr &MI,
   // Try to get non-debug instruction responsible for the DBG_VALUE.
   const MachineInstr *TransferInst = nullptr;
   Register Reg = MI.getDebugOperand(0).getReg();
-  if (Reg.isValid() && RegSetInstrs.contains(Reg))
-    TransferInst = RegSetInstrs.find(Reg)->second;
+  if (Reg.isValid())
+    if (auto It = RegSetInstrs.find(Reg); It != RegSetInstrs.end())
+      TransferInst = It->second;
 
   // Case of the parameter's DBG_VALUE at the start of entry MBB.
   if (!TransferInst && !LastNonDbgMI && MI.getParent()->isEntryBlock())

[kazutakahirata]

@OCHyams Thank for the review! FWIW, I just updated the PR to use DenseMap::lookup for brevity.

[OCHyams]

Nice, thanks for pointing that out (still LGTM)