---
layout: stdlib-reference
---

# WavePrefixCountBits

## Description





## Signature 

<pre>
<span class="code_keyword">uint</span> <a href="waveprefixcountbits-04af.html">WavePrefixCountBits</a>(<span class="code_keyword">bool</span> <a href="waveprefixcountbits-04af.html#decl-value" class="code_param">value</a>);

</pre>

## Parameters

####  <a id="decl-value"></a>value  : bool

## Availability and Requirements

Defined for the following targets:

#### hlsl
Available in all stages.

#### glsl
Available in all stages.

#### cuda
Available in all stages.

#### spirv
Available in all stages.

Requires capability: `spvGroupNonUniformBallot`.