[flang-commits] [flang] [flang] Use precompiled parsing headers (PR #130600)

[Kajetan Puchalski via flang-commits]

mrkajetanp wrote:

> Did this have much impact on compile time as well? I see the memory usage clearly coming down in your commit message but only the new compile time numbers and not the old ones?

It did, I just skipped over those for brevity (and because they're very similar to those included in the previous flang commit for splitting the TUs). Here are the last measurements I got:

FrontendActions.cpp:
User time (seconds): 38.40 (vs 69.35)
System time (seconds): 2.00 (vs 3.56)

ParserActions.cpp:
User time (seconds): 69.37 (vs 109.19)
System time (seconds): 1.81 (vs 3.80)

Precompiled header:
User time (seconds): 41.61
System time (seconds): 2.72




https://github.com/llvm/llvm-project/pull/130600