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Enable AutoFDO.

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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.
This commit is contained in:
Michael Benfield 2021-05-07 07:41:37 +00:00
parent d7539a6af0
commit a17193dbb9
12 changed files with 120 additions and 9 deletions
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2
compiler/rustc_interface/src/tests.rs
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@ -715,6 +715,7 @@ fn test_debugging_options_tracking_hash() {
tracked!(chalk, true);
tracked!(codegen_backend, Some("abc".to_string()));
tracked!(crate_attr, vec!["abc".to_string()]);
tracked!(debug_info_for_profiling, true);
tracked!(debug_macros, true);
tracked!(dep_info_omit_d_target, true);
tracked!(dual_proc_macros, true);
@ -752,6 +753,7 @@ fn test_debugging_options_tracking_hash() {
tracked!(profile, true);
tracked!(profile_emit, Some(PathBuf::from("abc")));
tracked!(profiler_runtime, "abc".to_string());
tracked!(profile_sample_use, Some(PathBuf::from("abc")));
tracked!(relax_elf_relocations, Some(true));
tracked!(relro_level, Some(RelroLevel::Full));
tracked!(remap_cwd_prefix, Some(PathBuf::from("abc")));