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<!---======================= begin_copyright_notice ============================
Copyright (C) 2020-2022 Intel Corporation
SPDX-License-Identifier: MIT
============================= end_copyright_notice ==========================-->
## Opcode
CALL = 0x33
## Format
| | | | |
| --- | --- | --- | --- |
| 0x33(CALL) | Exec_size | Pred | Label |
## Semantics
```
Calls the subroutine at <label>
```
## Description
```
Calls the subroutine <label> based on the predicate value.
* If <exec_size> is one:
* Execution jumps to the subroutine if the predicate is true. The call mask will be initialized to all ones at subroutine entry. Scalar calls must be marked with {NoMask}.
* If <exec_size> is greater than one:
* The call is executed if any of the active channels are predicated. At subroutine entry, the call mask will be initialized to the set of active channels that are predicated.
```
- **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
- **Label(uw):** Index of the label variable for the subroutine. It must be a function label
#### Properties
- **Source Modifier:** false
## Text
```
[(<P>)] CALL (<exec_size>) <label>
```
## Notes
Dynamic subroutine call through a variable is not supported.
|
