(RSB (MUL x y) a) && buildcfg.GOARM.Version == 7 => (MULS x y a)

(NEGF (MULF x y)) && buildcfg.GOARM.Version >= 6 => (NMULF x y)
(NEGD (MULD x y)) && buildcfg.GOARM.Version >= 6 => (NMULD x y)
(MULF (NEGF x) y) && buildcfg.GOARM.Version >= 6 => (NMULF x y)
(MULD (NEGD x) y) && buildcfg.GOARM.Version >= 6 => (NMULD x y)
(NMULF (NEGF x) y) => (MULF x y)
(NMULD (NEGD x) y) => (MULD x y)

				c.ctxt.Diag("illegal combination: %v", p)
			default:
				r = rt
			}
		}

		o1 |= (uint32(rf)&15)<<0 | (uint32(r)&15)<<16 | (uint32(rt)&15)<<12

	case 55: /* negf freg, freg */
		o1 = c.oprrr(p, p.As, int(p.Scond))

		rf := int(p.From.Reg)
		rt := int(p.To.Reg)

		o1 |= (uint32(rf)&15)<<0 | (uint32(rt)&15)<<12

	case 56: /* move to FP[CS]R */