On Fri, Oct 25, 2024 at 10:14:08PM -0700, Rong Xu wrote: > Enable the machine function split optimization for AutoFDO in Clang. > > Machine function split (MFS) is a pass in the Clang compiler that > splits a function into hot and cold parts. The linker groups all > cold blocks across functions together. This decreases hot code > fragmentation and improves iCache and iTLB utilization. > > MFS requires a profile so this is enabled only for the AutoFDO builds. > > Co-developed-by: Han Shen <shenhan@xxxxxxxxxx> > Signed-off-by: Han Shen <shenhan@xxxxxxxxxx> Reviewed-by: Kees Cook <kees@xxxxxxxxxx> -- Kees Cook
