func mulVectXORBase(c byte, d, p []byte) {
	t := mulTbl[c][:256]
	for i := 0; i < len(d); i++ {
		p[i] ^= t[d[i]]
	}
}
Coefficient multiply by vector(d) in basic method (byte by byte search multiply table).
Then update result(p) by XOR old result(p).
package reedsolomon
func mulVectBase(c byte, d, p []byte) {
	t := mulTbl[c][:256]
	for i := 0; i < len(d); i++ {
		p[i] = t[d[i]]
	}
}