[PATCH] D62091: [CommandLine] Reduce size of Option class by moving more members into bit field

[Chris Bieneman via Phabricator via llvm-commits]

beanz added a comment.

This is pretty cool. Since these are usually allocated as globals, this is saving pages of dirtied memory.

One implementation thought. What if we group the 16-bit fields together and make them uint16_t then use a uint16_t as the bitfield type for the remaining 15 bits. The performance of the 16-bit fields should be better if they are aligned (not that cl::opt perf really matters).


Repository:
  rG LLVM Github Monorepo

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  https://reviews.llvm.org/D62091/new/

https://reviews.llvm.org/D62091