ref: a94f75ac8f6a6365182191a55fad1e5723411457 dir: /mbld/cpufeatures+plan9-x64.s/
TEXT bld$cpufeatures+0(SB),$0 MOVL $0x1,AX CPUID MOVL CX,AX ROLQ $32, AX SHRQ $32, DX ORQ DX, AX RET