I'm playing funnyboat on my AMD64 laptop for quite some while already - I think it's safe to say it works. --[emerge --info]-- Portage 2.1-r1 (default-linux/amd64/2005.1, gcc-3.4.6, glibc-2.3.6-r4, 2.6.14-gentoo-r5 x86_64) ================================================================= System uname: 2.6.14-gentoo-r5 x86_64 AMD Turion(tm) 64 Mobile Technology ML-30 Gentoo Base System version 1.6.15 dev-lang/python: 2.3.5, 2.4.2 dev-python/pycrypto: 2.0.1-r5 dev-util/ccache: [Not Present] dev-util/confcache: [Not Present] sys-apps/sandbox: 1.2.17 sys-devel/autoconf: 2.13, 2.59-r7 sys-devel/automake: 1.4_p6, 1.5, 1.6.3, 1.7.9-r1, 1.8.5-r3, 1.9.6-r2 sys-devel/binutils: 2.16.1-r3 sys-devel/gcc-config: 1.3.13-r3 sys-devel/libtool: 1.5.22 virtual/os-headers: 2.6.11-r2 ACCEPT_KEYWORDS="amd64" AUTOCLEAN="yes" CBUILD="x86_64-pc-linux-gnu" CFLAGS="-march=athlon64 -pipe -O2" CHOST="x86_64-pc-linux-gnu" CONFIG_PROTECT="/etc /usr/kde/3.5/env /usr/kde/3.5/share/config /usr/kde/3.5/shutdown /usr/share/X11/xkb /usr/share/config" CONFIG_PROTECT_MASK="/etc/env.d /etc/gconf /etc/revdep-rebuild /etc/splash /etc/terminfo" CXXFLAGS="-march=athlon64 -pipe -O2" DISTDIR="/usr/portage/distfiles" FEATURES="autoconfig distlocks metadata-transfer sandbox sfperms strict" GENTOO_MIRRORS="http://distfiles.gentoo.org http://distro.ibiblio.org/pub/linux/distributions/gentoo" LC_ALL="sl_SI.utf8" LINGUAS="sl" MAKEOPTS="-j2" PKGDIR="/usr/portage/packages" PORTAGE_RSYNC_OPTS="--recursive --links --safe-links --perms --times --compress --force --whole-file --delete --delete-after --stats --timeout=180 --exclude='/distfiles' --exclude='/local' --exclude='/packages'" PORTAGE_TMPDIR="/var/tmp" PORTDIR="/usr/portage" PORTDIR_OVERLAY="/usr/local/portage" SYNC="rsync://rsync.gentoo.org/gentoo-portage" USE="amd64 X a52 aac aalib acpi alsa avi berkdb bitmap-fonts blender-game bzip2 cddb cdparanoia cdr cli crypt css cups cvs dar64 dbus divx4linux dri dv dvd dvdr dvdread effects emul-linux-x86 encode ethereal exif fat flac foomaticdb fortran gif gimpprint glx gpm gps gstreamer gtk2 gzip hal hou ieee1394 imlib input_devices_synaptics ipv6 javascript jpeg kde kipi libcaca lzw lzw-tiff mad matroska mime mp3 mpeg musepack music musicbrainz ncurses nls noamazon nsplugin ode offensive ogg on-the-fly-crypt openal opengl pam pcmcia pcre pdf perl png ppds pppd python qt qt3 qt4 quicktime readline reflection remix scanner sdl slang sou speex spell ssl subp subtitles svg tcpd theora tidy tiff timidity truetype truetype-fonts type1-fonts ucs2 unicode usb userlocales utf8 vcd videos visualization voice vorbis wifi xine xml xorg xpm xv xvid zlib elibc_glibc input_devices_keyboard input_devices_mouse kernel_linux linguas_sl userland_GNU video_cards_radeon video_cards_fglrx video_cards_vesa" Unset: CTARGET, EMERGE_DEFAULT_OPTS, INSTALL_MASK, LANG, LDFLAGS, PORTAGE_RSYNC_EXTRA_OPTS --[end quote]--
This got added to ~amd64 only two weeks ago. Standard procedure is a minimum waiting time of 1 month before going to amd64. Earliest date for stabilisation on amd64 would be july 28th if no bugs occur...