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<!---======================= begin_copyright_notice ============================
Copyright (C) 2020-2022 Intel Corporation
SPDX-License-Identifier: MIT
============================= end_copyright_notice ==========================-->
## Opcode
DP4A = 0x82
## Format
| | | | | | | |
| --- | --- | --- | --- | --- | --- | --- |
| 0x82(DP4A) | Exec_size | Pred | Dst | Src0 | Src1 | Src2 |
## Semantics
```
for (i = 0; i < exec_size; ++i) {
if (ChEn[i]) {
dst[i] = src0[i] + src1[i][7:0]*src2[i][7:0] + src1[i][15:8]*src2[i][15:8] + src1[i][23:16]*src2[i][23:16] + src1[i][31:24]*src2[i][31:24];
}
}
```
## Description
Performs component-wise four-wide dot product and accumulate operation. Each source's 32-bit channel value is treated as four element vector of 8-bit integer values. The operation performs a 32-bit precision dot product of those four bytes and adds it with a 32-bit accumulator.
- **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
- **Src1(vec_operand):** The second source operand. Operand class: general,indirect,immediate
- **Src2(vec_operand):** The third source operand. Operand class: general,indirect,immediate
#### Properties
- **Supported Types:** D,UD
- **Saturation:** Yes
- **Source Modifier:** false
## Text
```
[(<P>)] DP4A[.sat] (<exec_size>) <dst> <src0> <src1> <src2>
```
## Notes
|
