minglotus-6 wrote:

> > . For IR PGO, there is basically no need to do so as the instrumentation 
> > and profile-use should be in-sync. For front-end instrumentation, there 
> > seem to be some use cases to use out of sync profile: 
> > https://reviews.llvm.org/D51240.
> 
> Thanks for double checking. I noticed the ICP and stale profile tolerance 
> discussions when read the Phab history; it's good Phab review history are 
> still available nowadays.
> 
> IRPGO profiles could be used along with supplementary sample-pgo profiles. 
> I'll probably read relevant code in llvm-profdata to understand how these 
> interact in theory mostly for my own curiosity (hopefully no rough edges as 
> long as `llvm-profdata` uses the same pgo name format used by latest compiler)

For irpgo with supplementary profiles, this line to build a map 
(https://github.com/llvm/llvm-project/blob/44dc1e0baae7c4b8a02ba06dcf396d3d452aa873/llvm/tools/llvm-profdata/llvm-profdata.cpp#L982)
 needs an update. Will do it together with the test 
[update](https://github.com/llvm/llvm-project/pull/74008#discussion_r1421018997)
 in this pull request.

https://github.com/llvm/llvm-project/pull/74008
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