Beispiel #1
0
func oplook(ctxt *obj.Link, p *obj.Prog) *Optab {
	if oprange[AOR&obj.AMask].start == nil {
		buildop(ctxt)
	}

	a1 := int(p.Optab)
	if a1 != 0 {
		return &optab[a1-1:][0]
	}
	a1 = int(p.From.Class)
	if a1 == 0 {
		a1 = aclass(ctxt, &p.From) + 1
		p.From.Class = int8(a1)
	}

	a1--
	a3 := int(p.To.Class)
	if a3 == 0 {
		a3 = aclass(ctxt, &p.To) + 1
		p.To.Class = int8(a3)
	}

	a3--
	a2 := C_NONE
	if p.Reg != 0 {
		a2 = C_REG
	}

	//print("oplook %P %d %d %d\n", p, a1, a2, a3);
	r0 := p.As & obj.AMask

	o := oprange[r0].start
	if o == nil {
		o = oprange[r0].stop /* just generate an error */
	}
	e := oprange[r0].stop
	c1 := xcmp[a1][:]
	c3 := xcmp[a3][:]
	for ; -cap(o) < -cap(e); o = o[1:] {
		if int(o[0].a2) == a2 {
			if c1[o[0].a1] != 0 {
				if c3[o[0].a3] != 0 {
					p.Optab = uint16((-cap(o) + cap(optab)) + 1)
					return &o[0]
				}
			}
		}
	}

	ctxt.Diag("illegal combination %v %v %v %v", obj.Aconv(int(p.As)), DRconv(a1), DRconv(a2), DRconv(a3))
	prasm(p)
	if o == nil {
		o = optab
	}
	return &o[0]
}
Beispiel #2
0
func nocache(p *obj.Prog) {
	p.Optab = 0
	p.From.Class = 0
	p.To.Class = 0
}