stack = append(stack, abid.stackPtrs.data[i/8]>>(i%8)&1)
	}

	// Expand register pointer bitmaps into byte-maps.
	bool2byte := func(b bool) byte {
		if b {
			return 1
		}
		return 0
	}
	for i := 0; i < intArgRegs; i++ {
		inReg = append(inReg, bool2byte(abid.inRegPtrs.Get(i)))
		outReg = append(outReg, bool2byte(abid.outRegPtrs.Get(i)))
	}
	if ft.Kind_&abi.KindGCProg != 0 {
		panic("can't handle gc programs")
	}