JDevlieghere added a comment.
The ConstString/StringPool is pretty hot so I'm very excited about making it
faster.
I'm slightly concerned about the two hash values (the "full" hash vs the single
byte one). That's not something that was introduced in this patch, but passing
it around adds an opportunity to get it wrong.
I'm wondering if we could wrap this in a struct and pass that around:
struct HashedStringRef {
const llvm::StringRef str;
const unsigned full_hash;
const uint8_t hash;
HashedStringRef(llvm::StringRef s) : str(s), full_hash(djbHash(str)),
hash(hash(str)) {}
}
It looks like we always need both except in the StringMap implementation, but
if I'm reading the code correctly we'll have constructed it in ConstString
already anyway?
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D122974/new/
https://reviews.llvm.org/D122974
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