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<!---======================= begin_copyright_notice ============================
Copyright (C) 2020-2022 Intel Corporation
SPDX-License-Identifier: MIT
============================= end_copyright_notice ==========================-->
## Opcode
BFN = 0x85
## Format
| | | | | | | |
| --- | --- | --- | --- | --- | --- | --- |
| 0x85(BFN) | Exec_size | Pred | Dst | Src0 | Src1 | Src2 |
| | BooleanFuncCtrl | | | | | |
## Semantics
```
for (i = 0; i < exec_size; i++) {
if (ChEn[i]) {
for (idx = 0; idx < CHANNEL_SIZE_IN_BITS; idx++) {
// foreach bit of dst, src0, src1 and src2
dst.chan[i][idx] = (BooleanFuncCtrl >> ((src0.chan[i][idx]) +
(src1.chan[i][idx] << 1) +
(src2.chan[i][idx] << 2))) & 0x1;
}
}
}
```
## Description
Performs arbitrary boolean logical operation with 3 sources using a 8 entry lookup table <BooleanFuncCtrl>.
- **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,immediate16
- **Src1(vec_operand):** The second source operand. Operand class: general,indirect,immediate16
- **Src2(vec_operand):** The third source operand. Operand class: general,indirect,immediate16
- **BooleanFuncCtrl(ub):** the enumeration describes the value lookup indices for bfn
#### Properties
- **Supported Types:** D,UD,UW,W
- **Source Modifier:** false
## Text
```
[(<P>)] BFN.x[BooleanFuncCtrl] (<exec_size>) <dst> <src0> <src1> <src2>
```
## Notes
It is translated into a HW BFN instruction.
|
