<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/99151>99151</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            Implement the `radians` 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 `radians` clang builtin,
- [ ] Link `radians` clang builtin with `hlsl_intrinsics.h`
- [ ] Add sema checks for `radians` to `CheckHLSLBuiltinFunctionCall` in `SemaChecking.cpp`
- [ ] Add codegen for `radians` to `EmitHLSLBuiltinExpr` in `CGBuiltin.cpp`
- [ ] Add codegen tests to `clang/test/CodeGenHLSL/builtins/radians.hlsl`
- [ ] Add sema tests to `clang/test/SemaHLSL/BuiltIns/radians-errors.hlsl`
- [ ] Create the `int_spv_radians` intrinsic in `IntrinsicsSPIRV.td`
- [ ] In SPIRVInstructionSelector.cpp create the `radians` lowering and map  it to `int_spv_radians` in `SPIRVInstructionSelector::selectIntrinsic`.
- [ ] Create SPIR-V backend test case in `llvm/test/CodeGen/SPIRV/hlsl-intrinsics/radians.ll`

## DirectX

There were no DXIL opcodes found for `radians`.

## SPIR-V

# Radians:

## Description:
**Radians**  
  
Converts *degrees* to radians, i.e., *degrees* \* π / 180.  
  
The operand *degrees* must be a scalar or vector whose component type is
16-bit or 32-bit floating-point.  
  
*Result Type* and the type of *degrees* must be the same type. Results
are computed per component.

<table>
<colgroup>
<col style="width: 20%" />
<col style="width: 20%" />
<col style="width: 20%" />
<col style="width: 20%" />
<col style="width: 20%" />
</colgroup>
<thead>
<tr>
<th>Number</th>
<th>Operand 1</th>
<th>Operand 2</th>
<th>Operand 3</th>
<th>Operand 4</th>
</tr>
</thead>
<tbody>
<tr>
<td class="tableblock halign-left valign-top"><p>11</p></td>
<td
class="tableblock halign-left valign-top"><p><em>&lt;id&gt;</em><br />
<em>degrees</em></p></td>
<td></td>
<td></td>
<td></td>
</tr>
</tbody>
</table>



## Test Case(s)

 
 ### Example 1
```hlsl
//dxc radians_test.hlsl -T lib_6_8 -enable-16bit-types -O0

export float4 fn(float4 p1) {
    return radians(p1);
}
```
## HLSL:

Converts the specified value from degrees to radians.



| *ret* radians(*x*) |
|--------------------|



 

## Parameters



| Item                                                   | Description                            |
|--------------------------------------------------------|----------------------------------------|
| <span id="x"></span><span id="X"></span>*x*<br/> | \[in\] The specified value.<br/> |



 

## Return Value

The *x* parameter converted from degrees to radians.

## 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)                        | any                            |
| *ret* | same as input *x*                                                                                              | [**float**](/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 1 (DirectX HLSL)](https://github.com/MicrosoftDocs/win32/blob/docs/desktop-src//direct3dhlsl/dx-graphics-hlsl-sm1.md) and higher shader models | yes       |



 

## 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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