[all-commits] [llvm/llvm-project] 042cef: [CSSPGO] Fix a hash code truncating issue in Conte...

[Hongtao Yu via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 042cefd2b5c7d6457ffde5a83a0464bc740b2e42
      https://github.com/llvm/llvm-project/commit/042cefd2b5c7d6457ffde5a83a0464bc740b2e42
  Author: Hongtao Yu <hoy at fb.com>
  Date:   2021-11-16 (Tue, 16 Nov 2021)

  Changed paths:
    M llvm/include/llvm/Transforms/IPO/SampleContextTracker.h
    M llvm/lib/Transforms/IPO/SampleContextTracker.cpp

  Log Message:
  -----------
  [CSSPGO] Fix a hash code truncating issue in ContextTrieNode.

std::hash returns a 64bit hash code while previously we were using only lower 32 bits which caused hash collision for large workloads.

Reviewed By: wenlei, wlei

Differential Revision: https://reviews.llvm.org/D113688