return
			}
			prog.From = a[0]
			prog.Reg = p.getRegister(prog, op, &a[1])
			prog.AddRestSource(a[2])
			prog.To = a[3]
			break
		}
		p.errorf("can't handle %s instruction with 4 operands", op)
		return
	case 5:
		if p.arch.Family == sys.PPC64 {
			prog.From = a[0]
			// Second arg is always a register type on ppc64.
			prog.Reg = p.getRegister(prog, op, &a[1])

	}
	return true
}

// It would be nice if the error messages always began with
// the standard file:line: prefix,
// but that's not where we are today.
// It might be at the beginning but it might be in the middle of the printed instruction.
var fileLineRE = regexp.MustCompile(`(?:^|\()(testdata[/\\][\da-z]+\.s:\d+)(?:$|\)|:)`)

// Same as in test/run.go
var (
	errRE       = regexp.MustCompile(`// ERROR ?(.*)`)