func fillAligned(x uint64, m uint) uint64 {
	apply := func(x uint64, c uint64) uint64 {
		// The technique used it here is derived from
		// https://graphics.stanford.edu/~seander/bithacks.html#ZeroInWord
		// and extended for more than just bytes (like nibbles
		// and uint16s) by using an appropriate constant.
		//
		// To summarize the technique, quoting from that page:

		var s *mspan
		if r.useGCProg() {
			// This path is pretty unlikely, an object large enough
			// to have a GC program allocated on the stack.
			// We need some space to unpack the program into a straight
			// bitmask, which we allocate/free here.
			// TODO: it would be nice if there were a way to run a GC
			// program without having to store all its bits. We'd have
			// to change from a Lempel-Ziv style program to something else.

	=> (EXTRWconst [32-c] x2 x)
(XORshiftLL <t> [c] (UBFX [bfc] x) x2) && c < 32 && t.Size() == 4 && bfc == armBFAuxInt(32-c, c)
	=> (EXTRWconst [32-c] x2 x)

// Rewrite special pairs of shifts to AND.
// On ARM64 the bitmask can fit into an instruction.
(SRLconst [c] (SLLconst [c] x)) && 0 < c && c < 64 => (ANDconst [1<<uint(64-c)-1] x) // mask out high bits

  let hasFolder = 1;
}

def TFL_BitcastOp : TFL_Op<"bitcast", [Pure]> {
  let summary = "Bitcast operator";

  let description = [{
    Bitcasts a tensor from one type to another.
  }];

  let arguments = (ins AnyTensor:$input);

  let results = (outs AnyTensor:$output);

	s.sb = s.entryNewValue0(ssa.OpSB, types.Types[types.TUINTPTR])

	s.startBlock(s.f.Entry)
	s.vars[memVar] = s.startmem
	if s.hasOpenDefers {
		// Create the deferBits variable and stack slot.  deferBits is a
		// bitmask showing which of the open-coded defers in this function
		// have been activated.
		deferBitsTemp := typecheck.TempAt(src.NoXPos, s.curfn, types.Types[types.TUINT8])
		deferBitsTemp.SetAddrtaken(true)

}

func (t http2FrameType) String() string {
	if s, ok := http2frameName[t]; ok {
		return s
	}
	return fmt.Sprintf("UNKNOWN_FRAME_TYPE_%d", uint8(t))
}

// Flags is a bitmask of HTTP/2 flags.
// The meaning of flags varies depending on the frame type.
type http2Flags uint8

// Has reports whether f contains all (0 or more) flags in v.
func (f http2Flags) Has(v http2Flags) bool {

each value in the range [0, size).}]>:$bins
  );

  TF_DerivedOperandTypeAttr T = TF_DerivedOperandTypeAttr<2>;
}

def TF_BitcastOp : TF_Op<"Bitcast", [Pure]> {
  let summary = [{
Bitcasts a tensor from one type to another without copying data.
  }];

  let description = [{
Given a tensor `input`, this operation returns a tensor that has the same buffer
data as `input` with datatype `type`.