[llvm] b9cb9b3 - [GVNSink] Avoid repeated hash lookups (NFC) (#113023)

[via llvm-commits]

Author: Kazu Hirata
Date: 2024-10-20T10:41:07-07:00
New Revision: b9cb9b3f0d1e891b385eb53f8414b29554fd9234

URL: https://github.com/llvm/llvm-project/commit/b9cb9b3f0d1e891b385eb53f8414b29554fd9234
DIFF: https://github.com/llvm/llvm-project/commit/b9cb9b3f0d1e891b385eb53f8414b29554fd9234.diff

LOG: [GVNSink] Avoid repeated hash lookups (NFC) (#113023)

Added: 
    

Modified: 
    llvm/lib/Transforms/Scalar/GVNSink.cpp

Removed: 
    


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diff  --git a/llvm/lib/Transforms/Scalar/GVNSink.cpp b/llvm/lib/Transforms/Scalar/GVNSink.cpp
index 3dfa2dd9df27f5..59dfe33d8003ec 100644
--- a/llvm/lib/Transforms/Scalar/GVNSink.cpp
+++ b/llvm/lib/Transforms/Scalar/GVNSink.cpp
@@ -535,14 +535,10 @@ class ValueTable {
     uint32_t e = ExpressionNumbering[exp];
     if (!e) {
       hash_code H = exp->getHashValue([=](Value *V) { return lookupOrAdd(V); });
-      auto I = HashNumbering.find(H);
-      if (I != HashNumbering.end()) {
-        e = I->second;
-      } else {
-        e = nextValueNumber++;
-        HashNumbering[H] = e;
-        ExpressionNumbering[exp] = e;
-      }
+      auto [I, Inserted] = HashNumbering.try_emplace(H, nextValueNumber);
+      e = I->second;
+      if (Inserted)
+        ExpressionNumbering[exp] = nextValueNumber++;
     }
     ValueNumbering[V] = e;
     return e;