[llvm] 0ea1183 - [DWARFLinkerParallel] Switch to xxh3_64bits

[Fangrui Song via llvm-commits]

Author: Fangrui Song
Date: 2023-07-19T09:56:53-07:00
New Revision: 0ea11835d80fc98a4c4618ea27b1b7e75fe5b799

URL: https://github.com/llvm/llvm-project/commit/0ea11835d80fc98a4c4618ea27b1b7e75fe5b799
DIFF: https://github.com/llvm/llvm-project/commit/0ea11835d80fc98a4c4618ea27b1b7e75fe5b799.diff

LOG: [DWARFLinkerParallel] Switch to xxh3_64bits

xxh3 is substantially faster than xxh64.
For lld `.debug_str` there is substantial speedup (D154813).

@avl reports that it is around 1-2% improvement for different number of input sets and for different threads configuration.

Reviewed By: avl

Differential Revision: https://reviews.llvm.org/D155675

Added: 
    

Modified: 
    llvm/include/llvm/ADT/ConcurrentHashtable.h
    llvm/include/llvm/DWARFLinkerParallel/StringPool.h

Removed: 
    


################################################################################
diff  --git a/llvm/include/llvm/ADT/ConcurrentHashtable.h b/llvm/include/llvm/ADT/ConcurrentHashtable.h
index 438159d5c736b1..37c8af36bc73ec 100644
--- a/llvm/include/llvm/ADT/ConcurrentHashtable.h
+++ b/llvm/include/llvm/ADT/ConcurrentHashtable.h
@@ -77,7 +77,7 @@ class ConcurrentHashTableInfoByPtr {
 public:
   /// \returns Hash value for the specified \p Key.
   static inline uint64_t getHashValue(const KeyTy &Key) {
-    return xxHash64(Key);
+    return xxh3_64bits(Key);
   }
 
   /// \returns true if both \p LHS and \p RHS are equal.

diff  --git a/llvm/include/llvm/DWARFLinkerParallel/StringPool.h b/llvm/include/llvm/DWARFLinkerParallel/StringPool.h
index 4828ff4e4b05d3..44383ed6c7ddcc 100644
--- a/llvm/include/llvm/DWARFLinkerParallel/StringPool.h
+++ b/llvm/include/llvm/DWARFLinkerParallel/StringPool.h
@@ -27,7 +27,7 @@ class StringPoolEntryInfo {
 public:
   /// \returns Hash value for the specified \p Key.
   static inline uint64_t getHashValue(const StringRef &Key) {
-    return xxHash64(Key);
+    return xxh3_64bits(Key);
   }
 
   /// \returns true if both \p LHS and \p RHS are equal.