V4FNMADDSS (R15), [X1-X4], K4, X11                 // 6252770cab1f or 6252772cab1f or 6252774cab1f
	V4FNMADDSS -17(BP)(SI*8), [X11-X14], K4, X11       // 6272270cab9cf5efffffff or 6272272cab9cf5efffffff or 6272274cab9cf5efffffff
	V4FNMADDSS (R15), [X11-X14], K4, X11               // 6252270cab1f or 6252272cab1f or 6252274cab1f

	VPOPCNTQ X14, K4, X23                              // 62c2fd0c55fe
	VPOPCNTQ X0, K4, X23                               // 62e2fd0c55f8
	VPOPCNTQ 99(R15)(R15*4), K4, X23                   // 6282fd0c55bcbf63000000
	VPOPCNTQ 15(DX), K4, X23                           // 62e2fd0c55ba0f000000
	VPOPCNTQ X24, K4, X11                              // 6212fd0c55d8
	VPOPCNTQ X14, K4, X11                              // 6252fd0c55de

)

// magic HH-256 key as HH-256 hash of the first 100 decimals of π as utf-8 string with a zero key.
var magicHighwayHash256Key = []byte("\x4b\xe7\x34\xfa\x8e\x23\x8a\xcd\x26\x3e\x83\xe6\xbb\x96\x85\x52\x04\x0f\x93\x5d\xa3\x9f\x44\x14\x97\xe0\x9d\x13\x22\xde\x36\xa0")

var bitrotAlgorithms = map[BitrotAlgorithm]string{
	SHA256:          "sha256",
	BLAKE2b512:      "blake2b",
	HighwayHash256:  "highwayhash256",
	HighwayHash256S: "highwayhash256S",
}

	VPGATHERQQ X2, (BP)(Y7*2), X1   // ERROR "invalid instruction"
	// VM/Y rejects X index register.
	VPGATHERQQ Y2, (BP)(X7*2), Y1   // ERROR "invalid instruction"
	VPGATHERDD Y5, -8(X14*8), Y6    // ERROR "invalid instruction"
	// No VSIB for legacy instructions.
	MOVL (AX)(X0*1), AX             // ERROR "invalid instruction"
	MOVL (AX)(Y0*1), AX             // ERROR "invalid instruction"