<table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Issue</th>
<td>
<a href=https://github.com/llvm/llvm-project/issues/99091>99091</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>
Implement the `asint` HLSL Function
</td>
</tr>
<tr>
<th>Labels</th>
<td>
metabug,
HLSL,
backend:SPIR-V,
bot:HLSL
</td>
</tr>
<tr>
<th>Assignees</th>
<td>
</td>
</tr>
<tr>
<th>Reporter</th>
<td>
farzonl
</td>
</tr>
</table>
<pre>
- [ ] Implement `asint` clang builtin,
- [ ] Link `asint` clang builtin with `hlsl_intrinsics.h`
- [ ] Add sema checks for `asint` to `CheckHLSLBuiltinFunctionCall` in `SemaChecking.cpp`
- [ ] Add codegen for `asint` to `EmitHLSLBuiltinExpr` in `CGBuiltin.cpp`
- [ ] Add codegen tests to `clang/test/CodeGenHLSL/builtins/asint.hlsl`
- [ ] Add sema tests to `clang/test/SemaHLSL/BuiltIns/asint-errors.hlsl`
- [ ] Create the `int_spv_asint` intrinsic in `IntrinsicsSPIRV.td`
- [ ] In SPIRVInstructionSelector.cpp create the `asint` lowering and map it to `int_spv_asint` in `SPIRVInstructionSelector::selectIntrinsic`.
- [ ] Create SPIR-V backend test case in `llvm/test/CodeGen/SPIRV/hlsl-intrinsics/asint.ll`
## DirectX
There were no DXIL opcodes found for `asint`.
## SPIR-V
# [OpCompositeConstruct](https://registry.khronos.org/SPIR-V/specs/unified1/SPIRV.html#OpCompositeConstruct):
## Description:
Construct a new [*composite*](https://registry.khronos.org/SPIR-V/specs/unified1/SPIRV.html#CompositeType) object from a set of
constituent objects.
*Result Type* must be a [*composite*](https://registry.khronos.org/SPIR-V/specs/unified1/SPIRV.html#CompositeType) type, whose
top-level members/elements/components/columns have the same type as the
types of the operands, with one exception. The exception is that for
constructing a vector, the operands may also be vectors with the same
component type as the *Result Type* component type. If constructing a
vector, the total number of components in all the operands must equal
the number of components in *Result Type*.
*Constituents* become members of a structure, or elements of an array,
or components of a vector, or columns of a matrix. There must be exactly
one *Constituent* for each top-level member/element/component/column of
the result, with one exception. The exception is that for constructing a
vector, a contiguous subset of the scalars consumed can be represented
by a vector operand instead. The *Constituents* must appear in the order
needed by the definition of the type of the result. If constructing a
vector, there must be at least two *Constituent* operands.
<table>
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<col style="width: 20%" />
<col style="width: 20%" />
<col style="width: 20%" />
<col style="width: 20%" />
<col style="width: 20%" />
</colgroup>
<thead>
<tr>
<th>Word Count</th>
<th>Opcode</th>
<th>Results</th>
<th>Operands</th>
<th></th>
</tr>
</thead>
<tbody>
<tr>
<td class="tableblock halign-left valign-top"><p>3 + variable</p></td>
<td class="tableblock halign-left valign-top"><p>80</p></td>
<td
class="tableblock halign-left valign-top"><p><em><id></em><br />
<em>Result Type</em></p></td>
<td class="tableblock halign-left valign-top"><p><a
href="#ResultId"><em>Result <id></em></a></p></td>
<td class="tableblock halign-left valign-top"><p><em><id>,
<id>, …</em><br />
<em>Constituents</em></p></td>
</tr>
</tbody>
</table>
## Test Case(s)
### Example 1
```hlsl
//dxc asint_test.hlsl -T lib_6_8 -enable-16bit-types -O0
export int4 fn(float p1) {
return asint(p1);
}
```
### Example 2
```hlsl
//dxc asint_1_test.hlsl -T lib_6_8 -enable-16bit-types -O0
export int4 fn(uint p1) {
return asint(p1);
}
```
### Example 3
```hlsl
//dxc asint_2_test.hlsl -T lib_6_8 -enable-16bit-types -O0
export int4 fn(int p1) {
return asint(p1);
}
```
## HLSL:
Interprets the bit pattern of *x* as an integer.
| ret asint(*x*) |
|----------------|
## Parameters
| Item | Description |
|--------------------------------------------------------|------------------------------------|
| <span id="x"></span><span id="X"></span>*x*<br/> | \[in\] The input value.<br/> |
## Return Value
The input interpreted as an integer.
## Type Description
| Name | [**Template Type**](https://github.com/MicrosoftDocs/win32/blob/docs/desktop-src//direct3dhlsl/dx-graphics-hlsl-intrinsic-functions.md) | [**Component Type**](https://github.com/MicrosoftDocs/win32/blob/docs/desktop-src//direct3dhlsl/dx-graphics-hlsl-intrinsic-functions.md) | Size |
|-------|----------------------------------------------------------------------------------------------------------------|---------------------------------------------------------------------------------|--------------------------------|
| *x* | [**scalar**](https://github.com/MicrosoftDocs/win32/blob/docs/desktop-src//direct3dhlsl/dx-graphics-hlsl-intrinsic-functions.md), **vector**, or **matrix** | [**float**](/windows/desktop/WinProg/windows-data-types), [**uint**](/windows/desktop/WinProg/windows-data-types) | any |
| *ret* | same as input *x* | [**int**](/windows/desktop/WinProg/windows-data-types) | same dimension(s) as input *x* |
## Minimum Shader Model
This function is supported in the following shader models.
| Shader Model | Supported |
|---------------------------------------------------------------------|-----------|
| [Shader Model 4](https://github.com/MicrosoftDocs/win32/blob/docs/desktop-src//direct3dhlsl/dx-graphics-hlsl-sm4.md) and higher shader models | yes |
| [Shader Model 3 (DirectX HLSL)](https://github.com/MicrosoftDocs/win32/blob/docs/desktop-src//direct3dhlsl/dx-graphics-hlsl-sm3.md) | no |
| [Shader Model 2 (DirectX HLSL)](https://github.com/MicrosoftDocs/win32/blob/docs/desktop-src//direct3dhlsl/dx-graphics-hlsl-sm2.md) | no |
| [Shader Model 1 (DirectX HLSL)](https://github.com/MicrosoftDocs/win32/blob/docs/desktop-src//direct3dhlsl/dx-graphics-hlsl-sm1.md) | no |
## See also
<dl> <dt>
[**Intrinsic Functions (DirectX HLSL)**](https://github.com/MicrosoftDocs/win32/blob/docs/desktop-src//direct3dhlsl/dx-graphics-hlsl-intrinsic-functions.md)
</dt> </dl>
</pre>
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