[llvm-bugs] [Bug 184471] [Matrix] Implement matrix support for the `asfloat` HLSL Function

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Issue	184471
Summary	[Matrix] Implement matrix support for the `asfloat` HLSL Function
Labels	HLSL, bot:HLSL
Assignees
Reporter	kmpeng

    > Note: This issue tracks matrix support for `asfloat`. The original implementation issue is [here](https://github.com/llvm/llvm-project/issues/70098).  

Matrix requirements:
- [ ] https://github.com/llvm/wg-hlsl/issues/387  


## HLSL:

Interprets the bit pattern of *x* as a floating-point number.



| ret asfloat(*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 a floating-point number.

## 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**](https://github.com/MicrosoftDocs/win32/blob/docs/desktop-src/WinProg/windows-data-types.md), [**int**](https://github.com/MicrosoftDocs/win32/blob/docs/desktop-src/WinProg/windows-data-types.md), [**uint**](https://github.com/MicrosoftDocs/win32/blob/docs/desktop-src/WinProg/windows-data-types.md) | any                            |
| *ret* | same as input *x* | [**float**](https://github.com/MicrosoftDocs/win32/blob/docs/desktop-src/WinProg/windows-data-types.md) | same dimension(s) as input *x* |



 

## Function Overloads

<dl> `float&lt;x&gt; asfloat(float&lt;x&gt; value);`  
`float&lt;x&gt; asfloat(int&lt;x&gt; value);`  
`float&lt;x&gt; asfloat(uint&lt;x&gt; value);`  
</dl>

## 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        |



 

## Remarks

Older compilers incorrectly allowed `asfloat(bool)`, but note that bool inputs are not supported.

## 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>

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