---
layout: stdlib-reference
---

# \_WaveCountBits

## Description





## Signature 

<pre>
<span class="code_keyword">uint</span> <a href="0wavecountbits-015a.html">_WaveCountBits</a>(<a href="../types/vector/index.html" class="code_type">vector</a>&lt;<span class="code_keyword">uint</span>, 4&gt; <a href="0wavecountbits-015a.html#decl-value" class="code_param">value</a>);

</pre>

## Parameters

####  <a id="decl-value"></a>value  : [vector](../types/vector/index.html)\<uint, 4\>

## Availability and Requirements

Defined for the following targets:

#### hlsl
Available in all stages.

#### glsl
Available in all stages.

#### cuda
Available in all stages.

#### metal
Available in all stages.

#### spirv
Available in all stages.

Requires capabilities: `spvGroupNonUniform`, `spvGroupNonUniformBallot`.