[PATCH] D155992: [clangd] Use xxh3_64bits for background index file digests

[Fangrui Song via Phabricator via cfe-commits]

MaskRay created this revision.
MaskRay added reviewers: kadircet, sammccall.
Herald added a subscriber: arphaman.
Herald added a project: All.
MaskRay requested review of this revision.
Herald added subscribers: cfe-commits, ilya-biryukov.
Herald added a project: clang-tools-extra.

Many sources show that xxh3 is much better than xxh64. This particular
instance may or may not have noticeable difference, but this change
moves us toward removing xxHash64.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D155992

Files:
  clang-tools-extra/clangd/SourceCode.cpp
  clang-tools-extra/clangd/index/Background.cpp


Index: clang-tools-extra/clangd/index/Background.cpp
===================================================================
--- clang-tools-extra/clangd/index/Background.cpp
+++ clang-tools-extra/clangd/index/Background.cpp
@@ -155,7 +155,7 @@
 
 BackgroundQueue::Task BackgroundIndex::indexFileTask(std::string Path) {
   std::string Tag = filenameWithoutExtension(Path).str();
-  uint64_t Key = llvm::xxHash64(Path);
+  uint64_t Key = llvm::xxh3_64bits(Path);
   BackgroundQueue::Task T([this, Path(std::move(Path))] {
     std::optional<WithContext> WithProvidedContext;
     if (ContextProvider)
Index: clang-tools-extra/clangd/SourceCode.cpp
===================================================================
--- clang-tools-extra/clangd/SourceCode.cpp
+++ clang-tools-extra/clangd/SourceCode.cpp
@@ -559,7 +559,7 @@
 }
 
 FileDigest digest(llvm::StringRef Content) {
-  uint64_t Hash{llvm::xxHash64(Content)};
+  uint64_t Hash{llvm::xxh3_64bits(Content)};
   FileDigest Result;
   for (unsigned I = 0; I < Result.size(); ++I) {
     Result[I] = uint8_t(Hash);


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