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<title>FP_CONTRACT</title>
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<a xmlns="http://www.w3.org/1999/xhtml" id="FP_CONTRACT"></a>
<h1>Floating-point Macros and Pragmas</h1>
<p>
Floating-point macros and pragmas for math.h
</p>
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<div class="refsect1">
<a id="fpcontract"></a>
<h2>FP_CONTRACT</h2>
<p>
The <code class="function">FP_CONTRACT</code> pragma takes the form:
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#pragma OPENCL FP_CONTRACT on-off-switch
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<p>
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<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.
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<p>
The parameter <code class="varname">on-off-switch</code> is one of ON, OFF or DEFAULT. The DEFAULT value is ON.
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<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>
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<div class="refsect1">
<a id="fpfastfma"></a>
<h2>FP_FAST_FMA and FP_FAST_FMAF</h2>
<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 <code class="function">fma()</code> 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_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 <code class="function">fma()</code> function generally executes about as fast as, or faster than, a multiply and an add of
float operands.
</p>
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<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-1.0.pdf#page=175" target="OpenCL Spec">OpenCL Specification</a>
</p>
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<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>
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