// 64: outsw %fs:(%esi), %dx # encoding: [0x66,0x64,0x67,0x6f]
// 32: outsw %fs:(%esi), %dx # encoding: [0x66,0x64,0x6f]
// 16: outsw %fs:(%esi), %dx # encoding: [0x64,0x67,0x6f]
// 64: outsw %fs:(%esi), %dx # encoding: [0x66,0x64,0x67,0x6f]
// 32: outsw %fs:(%esi), %dx # encoding: [0x66,0x64,0x6f]
// 16: outsw %fs:(%esi), %dx # encoding: [0x64,0x67,0x6f]