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<!---======================= begin_copyright_notice ============================
Copyright (C) 2020-2022 Intel Corporation
SPDX-License-Identifier: MIT
============================= end_copyright_notice ==========================-->
## Opcode
FCCALL = 0x33
## Format
| | | | |
| --- | --- | --- | --- |
| 0x33(FCCALL) | Exec_size | Pred | Label |
## Semantics
FC Calls to a kernel identified as label, which is resolved by FC linker. Note that FCCALL is an alias to CALL (same opcode).
## Description
```
Calls another kernel identified by <label>. FCCALL is the same as CALL with the same opcode(0x33), except that the label of FCCALL is FC label, not subroutine label.
```
- **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 FC call's target. It must be a kernel label that is absent in the current compilation unit. FC linker will resolve it later.
#### Properties
- **Source Modifier:** false
## Text
```
FCCALL (<exec_size>) <label>
```
## Notes
Dynamic call through a variable is not supported.
|
