<!---======================= begin_copyright_notice ============================

Copyright (C) 2020-2022 Intel Corporation

SPDX-License-Identifier: MIT

============================= end_copyright_notice ==========================-->

## Opcode

  RNDD = 0x12

## Format

| | | | | |
| --- | --- | --- | --- | --- |
| 0x12(RNDD) | Exec_size | Pred | Dst | Src0 |


## Semantics


```

                    for (i = 0; i < exec_size; ++i){
                      if (ChEn[i]) {
                        dst[i] = floor(src0[i]);
                      }
                    }
```

## Description





```
    Takes component-wise floating point downward rounding of <src0> and stores the results in <dst>.
```


- **Exec_size(ub):** Execution size

  - Bit[2..0]: size of the region for source and destination operands

    - 0b000:  1 element (scalar)
    - 0b001:  2 elements
    - 0b010:  4 elements
    - 0b011:  8 elements
    - 0b100:  16 elements
    - 0b101:  32 elements
  - Bit[7..4]: execution mask (explicit control over the enabled channels)

    - 0b0000:  M1
    - 0b0001:  M2
    - 0b0010:  M3
    - 0b0011:  M4
    - 0b0100:  M5
    - 0b0101:  M6
    - 0b0110:  M7
    - 0b0111:  M8
    - 0b1000:  M1_NM
    - 0b1001:  M2_NM
    - 0b1010:  M3_NM
    - 0b1011:  M4_NM
    - 0b1100:  M5_NM
    - 0b1101:  M6_NM
    - 0b1110:  M7_NM
    - 0b1111:  M8_NM

- **Pred(uw):** Predication control


- **Dst(vec_operand):** The destination operand. Operand class: general,indirect


- **Src0(vec_operand):** The first source operand. Operand class: general,indirect,immediate


#### Properties
- **Supported Types:** F
- **Saturation:** Yes
- **Source Modifier:** arithmetic


#### Operand type maps
- **Type map**
  -  **Dst types:** F
  -  **Src types:** F


## Text
```
[(<P>)] RNDD[.sat] (<exec_size>) <dst> <src0>
```

## Notes





    Floating point round down for special values follow the rules below.

