// Unsigned comparisons to 0/1
(ULT (TEST(Q|L|W|B) x x) yes no) => (First no yes)
(UGE (TEST(Q|L|W|B) x x) yes no) => (First yes no)
(SETB (TEST(Q|L|W|B) x x)) => (ConstBool [false])
(SETAE (TEST(Q|L|W|B) x x)) => (ConstBool [true])

// x & 1 != 0 -> x & 1
(SETNE (TEST(B|W)const [1] x)) => (AND(L|L)const [1] x)
(SETB (BT(L|Q)const [0] x)) => (AND(L|Q)const [1] x)

(Trunc64to32 x) => (MOVWZreg x)

// Lowering constants
(Const(64|32|16|8) [val]) => (MOVDconst [int64(val)])
(Const(32|64)F ...) => (FMOV(S|D)const ...)
(ConstNil) => (MOVDconst [0])
(ConstBool [t]) => (MOVDconst [b2i(t)])

// Carrying addition.
(Select0 (Add64carry x y c)) =>            (Select0 <typ.UInt64> (ADDE x y (Select1 <typ.UInt64> (ADDCconst c [-1]))))