// n is always a zero-extended uint16 value, so n & z is always a non-negative 32 or 64 bit value.
// Rewrite to a cmp int64(0) to lower into ANDCCconst in the latelower pass.
(CMP(W|U|WU)const [0] a:(ANDconst [n] z)) => (CMPconst [0] a)

// SETBC auxInt values 0=LT 1=GT 2=EQ   Crbit==1 ? 1 : 0
// SETBCR auxInt values 0=LT 1=GT 2=EQ   Crbit==1 ? 0 : 1
(Equal cmp) => (SETBC [2] cmp)