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<title>FP_CONTRACT, FP_FAST_FMAF, FP_FAST_FMA_HALF</title>
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<a id="id-1"></a>
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<div xmlns="" class="refnamediv">
<a xmlns="http://www.w3.org/1999/xhtml" id="FP_CONTRACT"></a>
<h1>FP_CONTRACT, FP_FAST_FMAF, FP_FAST_FMA_HALF</h1>
<p>
Control expression contraction; fast fma()
<div xmlns="http://www.w3.org/1999/xhtml" class="informaltable"><table border="0"><colgroup><col align="left" class="col1" /></colgroup><tbody><tr><td align="left">
<div class="literallayout"><p><br />
#pragma OPENCL FP_CONTRACT <code class="varname">on-off-switch</code><br />
<br />
<code class="varname">on-off-switch</code> is one of:<br />
     ON, OFF or DEFAULT.<br />
     The DEFAULT value is ON.<br />
<br />
FP_FAST_FMAF<br />
FP_FAST_FMA<br />
FP_FAST_FMA_HALF<br />
        </p></div>
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</div>
<div class="refsect1">
<a id="fpcontract"></a>
<h2>FP_CONTRACT</h2>
<p>
The <code class="function">FP_CONTRACT</code> pragma takes the form:
</p>
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#pragma OPENCL FP_CONTRACT on-off-switch
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<p>
</p>
<p>
<code class="function">FP_CONTRACT</code> can be used to allow (if the state is
<code class="constant">on</code>) or disallow (if the state is <code class="constant">off</code>)
the implementation to contract expressions. Each pragma can occur either outside
external declarations or preceding all explicit declarations and statements inside
a compound statement.
</p>
<p>
The parameter <code class="varname">on-off-switch</code> is one of ON, OFF or DEFAULT. The
DEFAULT value is ON.
</p>
<p>
When outside external declarations, the pragma takes effect from its occurrence until
another <code class="function">FP_CONTRACT</code> pragma is encountered, or until the end of
the translation unit. When inside a compound statement, the pragma takes effect from
its occurrence until another <code class="function">FP_CONTRACT</code> pragma is encountered
(including within a nested compound statement), or until the end of the compound
statement; at the end of a compound statement the state for the pragma is restored
to its condition just before the compound statement. If this pragma is used in any
other context, the behavior is undefined.
</p>
</div>
<div class="refsect1">
<a id="fpfastfma"></a>
<h2>FP_FAST_FMAF and FP_FAST_FMA</h2>
<p>
The <code class="constant">FP_FAST_FMAF</code> macro indicates whether the
<a class="citerefentry" href="fma.html"><span class="citerefentry"><span class="refentrytitle">fma</span></span></a> function
is fast compared with direct code for single precision floating-point. If
defined, the <code class="constant">FP_FAST_FMAF</code> macro shall indicate that the
<a class="citerefentry" href="fma.html"><span class="citerefentry"><span class="refentrytitle">fma</span></span></a>() function generally
executes about as fast as, or faster than, a multiply and an add of float operands.
</p>
<p>
The <code class="constant">FP_FAST_FMA</code> macro indicates whether the
<a class="citerefentry" href="fma.html"><span class="citerefentry"><span class="refentrytitle">fma</span></span></a> family of functions
are fast compared with direct code for double precision floating-point. If
defined, the <code class="constant">FP_FAST_FMA</code> macro shall indicate that the
<a class="citerefentry" href="fma.html"><span class="citerefentry"><span class="refentrytitle">fma</span></span></a>() function generally
executes about as fast as, or faster than, a multiply and an add of double operands.
</p>
<p>
The <code class="constant">FP_FAST_FMA_HALF</code> macro indicates whether the
<a class="citerefentry" href="fma.html"><span class="citerefentry"><span class="refentrytitle">fma</span></span></a>() family of
functions are fast compared with direct code for half precision floating-point. If
defined, the <code class="constant">FP_FAST_FMA_HALF</code> macro shall indicate that the
<a class="citerefentry" href="fma.html"><span class="citerefentry"><span class="refentrytitle">fma</span></span></a>() function generally
executes about as fast as, or faster than, a multiply and an add of half operands
</p>
</div>
<div class="refsect1">
<a id="specification"></a>
<h2>Specification</h2>
<p>
<img src="pdficon_small1.gif" />
<a href="http://www.khronos.org/registry/cl/specs/opencl-1.2.pdf#page=252" target="OpenCL Spec">OpenCL Specification</a>
</p>
</div>
<div class="refsect1">
<a id="seealso"></a>
<h2>Also see</h2>
<p>
<a class="citerefentry" href="mathFunctions.html"><span class="citerefentry"><span class="refentrytitle">Math Functions</span></span></a>,
<a class="citerefentry" href="mathConstants.html"><span class="citerefentry"><span class="refentrytitle">Symbolic Math Constants</span></span></a>,
<a class="citerefentry" href="macroLimits.html"><span class="citerefentry"><span class="refentrytitle">Macros and Limits</span></span></a>
</p>
</div>
<div xmlns="" class="refsect3" lang="en" xml:lang="en"><a xmlns="http://www.w3.org/1999/xhtml" id="Copyright"></a><h4 xmlns="http://www.w3.org/1999/xhtml"></h4><img xmlns="http://www.w3.org/1999/xhtml" src="KhronosLogo.jpg" /><p xmlns="http://www.w3.org/1999/xhtml"></p>Copyright © 2007-2011 The Khronos Group Inc.
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