rust/compiler/rustc_session
Michael Benfield a17193dbb9 Enable AutoFDO.
This largely involves implementing the options debug-info-for-profiling
and profile-sample-use and forwarding them on to LLVM.

AutoFDO can be used on x86-64 Linux like this:
rustc -O -Cdebug-info-for-profiling main.rs -o main
perf record -b ./main
create_llvm_prof --binary=main --out=code.prof
rustc -O -Cprofile-sample-use=code.prof main.rs -o main2

Now `main2` will have feedback directed optimization applied to it.

The create_llvm_prof tool can be obtained from this github repository:
https://github.com/google/autofdo

Fixes #64892.
2021-10-06 19:36:52 +00:00
..
src Enable AutoFDO. 2021-10-06 19:36:52 +00:00
Cargo.toml Move rustc_middle::middle::cstore to rustc_session. 2021-10-03 16:08:51 +02:00