// Unified memory is a single memory address space accessible from any device.
  TF_Bool supports_unified_memory;

  // Whether to wrap allocator for this device with an allocator that uses BFC
  // (best-fit with coalescing) strategy.
  TF_Bool use_bfc_allocator;

  // Whether to force the memory allocations to grow over time instead of
  // allocating it all at once. When this is set to true, the value of

	BFXU	$-40, $4, R2       // ERROR "wrong width or LSB"
	BFX	$-2, $4, R2, R3    // ERROR "wrong width or LSB"
	BFXU	$4, R2, R5, R2     // ERROR "missing or wrong LSB"
	BFXU	$4, R2, R5         // ERROR "missing or wrong LSB"
	BFC	$12, $8, R2, R3    // ERROR "illegal combination"
	MOVB	R0>>8, R2          // ERROR "illegal shift"
	MOVH	R0<<16, R2         // ERROR "illegal shift"
	MOVBS	R0->8, R2          // ERROR "illegal shift"

}

// returns the lsb part of the auxInt field of arm64 bitfield ops.
func (bfc arm64BitField) getARM64BFlsb() int64 {
	return int64(uint64(bfc) >> 8)
}

// returns the width part of the auxInt field of arm64 bitfield ops.
func (bfc arm64BitField) getARM64BFwidth() int64 {
	return int64(bfc) & 0xff
}

// checks if mask >> rshift applied at lsb is a valid arm64 bitfield op mask.

	SWI	$65535         // ffff00ef
	SWI	               // 000000ef

// BFX/BFXU/BFC/BFI
	BFX	$16, $8, R1, R2 // BFX $16, R1, $8, R2   // 5124afe7
	BFX	$29, $2, R8                              // 5881bce7
	BFXU	$16, $8, R1, R2 // BFXU $16, R1, $8, R2  // 5124efe7
	BFXU	$29, $2, R8                              // 5881fce7
	BFC	$29, $2, R8                              // 1f81dee7

		r := int(p.Reg)
		o1 |= (uint32(rf)&15)<<8 | (uint32(r)&15)<<0 | (uint32(rt)&15)<<16 | (uint32(rt2)&15)<<12

	case 18: /* BFX/BFXU/BFC/BFI */
		o1 = c.oprrr(p, p.As, int(p.Scond))
		rt := int(p.To.Reg)
		r := int(p.Reg)
		if r == 0 {
			r = rt
		} else if p.As == ABFC { // only "BFC $width, $lsb, Reg" is accepted, p.Reg must be 0
			c.ctxt.Diag("illegal combination: %v", p)
		}

1F2A          ; mapped                 ; 1F22          # 1.1  GREEK CAPITAL LETTER ETA WITH PSILI AND VARIA
1F2B          ; mapped                 ; 1F23          # 1.1  GREEK CAPITAL LETTER ETA WITH DASIA AND VARIA
1F2C          ; mapped                 ; 1F24          # 1.1  GREEK CAPITAL LETTER ETA WITH PSILI AND OXIA
1F2D          ; mapped                 ; 1F25          # 1.1  GREEK CAPITAL LETTER ETA WITH DASIA AND OXIA

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        gradient ops and avoid an extra gather operation that was in the
        previous gradient implementation.
    *   Added a new session config setting `internal_fragmentation_fraction`,
        which controls when the BFC Allocator needs to split an oversized chunk
        to satisfy an allocation request.
    *   Added `tf.get_current_name_scope()` which returns the current full name
        scope string that will be prepended to op names.