i have -3dnow in my use flags... but regardless to this, files are compiled with these options: -DUSE_X86_ASM -DUSE_MMX_ASM -DUSE_3DNOW_ASM -DUSE_KATMAI_ASM Notice the '-DUSE_3DNOW_ASM" definitely a bug (i hope)
This is not a bug, as the ebuild never disables it explicitly.