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Diffstat (limited to 'gcc/doc/install.texi')
| -rw-r--r-- | gcc/doc/install.texi | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/gcc/doc/install.texi b/gcc/doc/install.texi index 3015de8..9248f0d 100644 --- a/gcc/doc/install.texi +++ b/gcc/doc/install.texi @@ -2776,6 +2776,17 @@ Unlike standard bootstrap, several additional restrictions apply. The compiler used to build @code{stage1} needs to support a 64-bit integral type. It is recommended to only use GCC for this. +On Linux/x86_64 hosts with some restrictions (no virtualization) it is +also possible to do autofdo build with @samp{make +autoprofiledback}. This uses Linux perf to sample branches in the +binary and then rebuild it with feedback derived from the profile. +Linux perf and the @code{autofdo} toolkit needs to be installed for +this. + +Only the profile from the current build is used, so when an error +occurs it is recommended to clean before restarting. Otherwise +the code quality may be much worse. + @html <hr /> <p> |