[llvm] d3ca484 - [LiveDebugValues] Avoid repeated hash lookups (NFC) (#110379)

[via llvm-commits]

Author: Kazu Hirata
Date: 2024-09-28T13:12:10-07:00
New Revision: d3ca4844062411ae1b962e41636f3461d46a5b92

URL: https://github.com/llvm/llvm-project/commit/d3ca4844062411ae1b962e41636f3461d46a5b92
DIFF: https://github.com/llvm/llvm-project/commit/d3ca4844062411ae1b962e41636f3461d46a5b92.diff

LOG: [LiveDebugValues] Avoid repeated hash lookups (NFC) (#110379)

Added: 
    

Modified: 
    llvm/lib/CodeGen/LiveDebugValues/InstrRefBasedImpl.cpp

Removed: 
    


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diff  --git a/llvm/lib/CodeGen/LiveDebugValues/InstrRefBasedImpl.cpp b/llvm/lib/CodeGen/LiveDebugValues/InstrRefBasedImpl.cpp
index a73a3aa59403b3..a9d28a39c4418b 100644
--- a/llvm/lib/CodeGen/LiveDebugValues/InstrRefBasedImpl.cpp
+++ b/llvm/lib/CodeGen/LiveDebugValues/InstrRefBasedImpl.cpp
@@ -3958,12 +3958,10 @@ class LDVSSAUpdater {
   /// For a given MBB, create a wrapper block for it. Stores it in the
   /// LDVSSAUpdater block map.
   LDVSSABlock *getSSALDVBlock(MachineBasicBlock *BB) {
-    auto it = BlockMap.find(BB);
-    if (it == BlockMap.end()) {
-      BlockMap[BB] = new LDVSSABlock(*BB, *this);
-      it = BlockMap.find(BB);
-    }
-    return it->second;
+    auto [It, Inserted] = BlockMap.try_emplace(BB);
+    if (Inserted)
+      It->second = new LDVSSABlock(*BB, *this);
+    return It->second;
   }
 
   /// Find the live-in value number for the given block. Looks up the value at