// Ignore field names that don't have the prefix we're
			// looking for. It is common in C headers to have fields
			// named, say, _pad in an otherwise prefixed header.
			// If the struct has 3 fields tv_sec, tv_usec, _pad1, then we
			// still want to remove the tv_ prefix.
			// The check for "orig_" here handles orig_eax in the
			// x86 ptrace register sets, which otherwise have all fields
			// with reg_ prefixes.

	AND	$1, ZR                              // fb0340b2ff031b8a
	ANDW	$1, ZR                              // fb030032ff031b0a
	// TODO: this could have better encoding
	ANDW	$-1, R10                            // 1b0080124a011b0a
	AND	$8, R0, RSP                         // 1f007d92
	ORR	$8, R0, RSP                         // 1f007db2