[PATCH] D71261: [ThinLTO] upgrade IR symtab in parallel ahead of time

[Yuanfang Chen via Phabricator via llvm-commits]

ychen added a comment.

In D71261#1786331 <https://reviews.llvm.org/D71261#1786331>, @steven_wu wrote:

> This sounds like a good idea. Have you thought about just write out upgraded bitcode file on disk (since you named it a "SymTabCache"), maybe into thinLTO cache? This will speed up the incremental build as well. I think most of the upgrade path are coming from linking a bitcode static library, which is probably not changing during incremental build so we just need to upgrade once.


Thanks for the feedback, @steven_wu. I think there would be more improvement by caching the upgraded IR symbol table (the IR module self is in memory but not parsed). I would do some experiments to get rough numbers. I think it will be a separate patch for the caching because it helps with or without this patch.


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