Profile-Guided Optimization (PGO) support in D ecosystem

[Iain Buclaw]

On Friday, 10 November 2023 at 12:47:56 UTC, Alexander Zaitsev 
wrote:
> Hi!
>

IIRC, Jon wrote a bit about LTO and PGO (with benchmarks 
somewhere) for tsv-utils.

https://github.com/eBay/tsv-utils/

> 1. What is the most up-to-date place for PGO documentation? 
> Right now I found only 
> [this](https://wiki.dlang.org/LDC_LLVM_profiling_instrumentation) for LDC. What about DMD and GDC?

Look up any GCC documentation/how-tos on using 
`-fprofile-generate=` and `-fprofile-use=`.

> 5. Is there any documentation on how to build DMD and GDC with 
> LTO+PGO? I am looking for smth like it's 
> [done](https://clickhouse.com/docs/en/operations/optimizing-performance/profile-guided-optimization) in the ClickHouse documentation (or like it's done for Clang or Rustc).

LTO  and PGO aren't a feature of the language, rather the 
compiler infrastructure.