// equivalent function from the corresponding s390x
// instruction for vector multiply high, low, and add,
// since there aren't exact equivalent instructions.
// The corresponding s390x instructions appear in the
// comments.
// Implementation for big endian would have to be
// investigated, I think it would be different.
//
//
// Vector multiply word
//
//	VMLF  x0, x1, out_low
//	VMLHF x0, x1, out_hi

		// address such as Unix domain socket path into a valid, ignored
		// Host header (see https://go.dev/issue/61431).
		//
		// We don't preserve the truncation, because sending an altered
		// header field opens a smuggling vector. Instead, zero out the
		// Host header entirely if it isn't valid. (An empty Host is valid;
		// see RFC 9112 Section 3.2.)
		//
		// Return an error if we're sending to a proxy, since the proxy

(Ctz32 <t> x) => (SUB (MOVDconst [64]) (FLOGR (MOVWZreg (ANDW <t> (SUBWconst <t> [1] x) (NOTW <t> x)))))

(BitLen64 x) => (SUB (MOVDconst [64]) (FLOGR x))

// POPCNT treats the input register as a vector of 8 bytes, producing
// a population count for each individual byte. For inputs larger than
// a single byte we therefore need to sum the individual bytes produced
// by the POPCNT instruction. For example, the following instruction

	}

	return arr
}

// vectorType parses:
//
//	<vector-type> ::= Dv <number> _ <type>
//	              ::= Dv _ <expression> _ <type>
func (st *state) vectorType(isCast bool) AST {
	if len(st.str) == 0 {
		st.fail("expected vector dimension")
	}

	var dim AST
	if st.str[0] == '_' {
		st.advance(1)
		dim = st.expression()
	} else {