a <a href="#Run_time_panics">run-time panic</a> occurs.
The shift operators implement arithmetic shifts if the left operand is a signed
integer and logical shifts if it is an unsigned integer.
There is no upper limit on the shift count. Shifts behave
as if the left operand is shifted <code>n</code> times by 1 for a shift
count of <code>n</code>.

      // offset = d<=0 ? max_diag_len - diag_len_d : 0
      cmp = rewriter.create<TF::LessEqualOp>(loc, d, b_zero);
    } else {
      // offset = 0
      cmp = b_false;
    }

    // This offset shifts the diagonals to the "left" or "right", depending
    // on alignment.
    Value offset = rewriter.create<SelectOp>(
        loc, b_zero.getType(), cmp,

}

func (q *http2writeQueue) empty() bool { return len(q.s) == 0 }

func (q *http2writeQueue) push(wr http2FrameWriteRequest) {
	q.s = append(q.s, wr)
}

func (q *http2writeQueue) shift() http2FrameWriteRequest {
	if len(q.s) == 0 {
		panic("invalid use of queue")
	}
	wr := q.s[0]
	// TODO: less copy-happy queue.
	copy(q.s, q.s[1:])
	q.s[len(q.s)-1] = http2FrameWriteRequest{}

	etype1 := s.concreteEtype(t)
	etype2 := s.concreteEtype(u)
	x, ok := shiftOpToSSA[opAndTwoTypes{op, etype1, etype2}]
	if !ok {
		s.Fatalf("unhandled shift op %v etype=%s/%s", op, etype1, etype2)
	}
	return x
}

func (s *state) uintptrConstant(v uint64) *ssa.Value {
	if s.config.PtrSize == 4 {