https://bugs.llvm.org/show_bug.cgi?id=37029
Bug ID: 37029
Summary: xxhash64 probably not the best choice for SHF_MERGE
merging
Product: lld
Version: unspecified
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: ELF
Assignee: unassignedb...@nondot.org
Reporter: raf...@espindo.la
CC: llvm-bugs@lists.llvm.org
As a quick experiment I replaced the two calls to xxhash64 in splitIntoPieces
with hash_value. This resulted in a 4% speedup when linking scylla.
While xxHash64 was 13.3% of the runtime of master, hash_combine is just 6.6% of
the patch.
We can't just use hash_combine since it produces different results on 32 bit
hosts, but refactoring the algorithm to have the option of a stable result is
probably worth it.
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