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Copyright (C) 2020-2021 Intel Corporation

SPDX-License-Identifier: MIT

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## Opcode

  VME_FBR = 0x56

## Format

| | | | | | | |
| --- | --- | --- | --- | --- | --- | --- |
| 0x56(VME_FBR) | UNIInput | FBRInput | Surface | FBRMbMode | FBRSubMbShape | FBRSubPredMode |
|               | Output   |          |         |           |               |                |


## Semantics




      Video Motion Estimation - fractional and bidirectional refinement

## Description


    Performs Video Motion Estimation with fractional and bidirectional refinement (FBR). See [4] for more detailed information on the VME functionality. This instruction may not appear inside a SIMD control flow block.

- **UNIInput(raw_operand):** The raw operand of a general variable that stores the universal VME payload data. Must have type UB. Must have 128 elements

- **FBRInput(raw_operand):** The raw operand of a general variable that stores the FBR specific payload data. Must have type UB. Must have 128 elements

- **Surface(ub):** The index of the surface variable

- **FBRMbMode(scalar):** The inter macro-block type. Must have type UD. Valid values are:
 
  - 0: 16x16 
  - 1: 16x8 
  - 2: 8x16 
  - 3: 8x8
- **FBRSubMbShape(scalar):** The sub-shape per block for fractional and bidirectional refinement. Must have type UD
 
  - Bit[1..0]: SubMbShape[0]
 
    - 0b00:  8x8 
    - 0b01:  8x4 
    - 0b10:  4x8 
    - 0b11:  4x4 
  - Bit[3..2]: SubMbShape[1]
 
    - 0b00:  8x8 
    - 0b01:  8x4 
    - 0b10:  4x8 
    - 0b11:  4x4 
  - Bit[5..4]: SubMbShape[2]
 
    - 0b00:  8x8 
    - 0b01:  8x4 
    - 0b10:  4x8 
    - 0b11:  4x4 
  - Bit[7..6]: SubMbShape[3]
 
    - 0b00:  8x8 
    - 0b01:  8x4 
    - 0b10:  4x8 
    - 0b11:  4x4
- **FBRSubPredMode(scalar):** The selection of shapes from the input message for performing VME. Must have type UD
 
  - Bit[1..0]: SubMbPredMode[0]
 
    - 0b00:  Forward 
    - 0b01:  Backward 
    - 0b10:  Bidirectional 
    - 0b11:  Illegal 
  - Bit[3..2]: SubMbPredMode[1]
 
    - 0b00:  Forward 
    - 0b01:  Backward 
    - 0b10:  Bidirectional 
    - 0b11:  Illegal 
  - Bit[5..4]: SubMbPredMode[2]
 
    - 0b00:  Forward 
    - 0b01:  Backward 
    - 0b10:  Bidirectional 
    - 0b11:  Illegal 
  - Bit[7..6]: SubMbPredMode[3]
 
    - 0b00:  Forward 
    - 0b01:  Backward 
    - 0b10:  Bidirectional 
    - 0b11:  Illegal
- **Output(raw_operand):** The raw operand of a general variable used to store the VME output data. Must have type UB. Must have 224 elements

#### Properties


## Text
```
    

    VME_FBR (<FBRMbMode>, <FBRSubMbShape>, <FBRSubPredMode>) <surface> <UNIInput> <FBRInput> <output>
```



## Notes


