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] }
func oplook(ctxt *obj.Link, p *obj.Prog) *Optab { if oprange[AOR&obj.AMask] == nil { buildop(ctxt) } a1 := int(p.Optab) if a1 != 0 { return &optab[a1-1] } 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); ops := oprange[p.As&obj.AMask] c1 := &xcmp[a1] c3 := &xcmp[a3] for i := range ops { op := &ops[i] if int(op.a2) == a2 && c1[op.a1] && c3[op.a3] { p.Optab = uint16(cap(optab) - cap(ops) + i + 1) return op } } ctxt.Diag("illegal combination %v %v %v %v", obj.Aconv(p.As), DRconv(a1), DRconv(a2), DRconv(a3)) prasm(p) if ops == nil { ops = optab } return &ops[0] }
func nocache(p *obj.Prog) { p.Optab = 0 p.From.Class = 0 p.To.Class = 0 }