http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56619 --- Comment #1 from Andi Kleen <andi-gcc at firstfloor dot org> 2013-03-14 13:18:32 UTC --- This is a more complete version of the documentation (also including RTM intrinsics), again not approved: http://patchwork.ozlabs.org/patch/211504/