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Document fp16 intrinsics

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Anton Korobeynikov 2010-03-14 18:42:47 +00:00
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@ -255,6 +255,12 @@
<li><a href="#int_umul_overflow">'<tt>llvm.umul.with.overflow.*</tt> Intrinsics</a></li>
</ol>
</li>
<li><a href="#int_fp16">Half Precision Floating Point Intrinsics</a>
<ol>
<li><a href="#int_to_fp16">'<tt>llvm.convert.to.fp16</tt>' Intrinsic</a></li>
<li><a href="#int_from_fp16">'<tt>llvm.conver.from.fp16</tt>' Intrinsic</a></li>
</ol>
</li>
<li><a href="#int_debugger">Debugger intrinsics</a></li>
<li><a href="#int_eh">Exception Handling intrinsics</a></li>
<li><a href="#int_trampoline">Trampoline Intrinsic</a>
@ -6606,6 +6612,90 @@ LLVM</a>.</p>
</div>
<!-- ======================================================================= -->
<div class="doc_subsection">
<a name="int_fp16">Half Precision Floating Point Intrinsics</a>
</div>
<div class="doc_text">
<p>Half precision floating point is storage-only format. That is why the values
in such format should be promoted to single precision format before any
operations. LLVM provides intrinsics for conversions to single precision and
back.</p>
</div>
<!-- _______________________________________________________________________ -->
<div class="doc_subsubsection">
<a name="int_to_fp16">'<tt>llvm.convert.to.fp16</tt>' Intrinsic</a>
</div>
<div class="doc_text">
<h5>Syntax:</h5>
<pre>
declare i16 @llvm.convert.to.fp16(f32 %a)
</pre>
<h5>Overview:</h5>
<p>The '<tt>llvm.convert.to.fp16</tt>' intrinsic function performs
a conversion from single precision floating point format to half precision
floating point format.</p>
<h5>Arguments:</h5>
<p>The intrinsic function contains single argument - the value to be
converted.</p>
<h5>Semantics:</h5>
<p>The '<tt>llvm.convert.to.fp16</tt>' intrinsic function performs
a conversion from single precision floating point format to half precision
floating point format. Since the format is storage only the return value is
just an <tt>i16</tt> which contains the converted number.</p>
<h5>Examples:</h5>
<pre>
%res = call i16 @llvm.convert.to.fp16(f32 %a)
store i16 %res, i16* @x, align 2
</pre>
</div>
<!-- _______________________________________________________________________ -->
<div class="doc_subsubsection">
<a name="int_from_fp16">'<tt>llvm.convert.from.fp16</tt>' Intrinsic</a>
</div>
<div class="doc_text">
<h5>Syntax:</h5>
<pre>
declare f32 @llvm.convert.from.fp16(i16 %a)
</pre>
<h5>Overview:</h5>
<p>The '<tt>llvm.convert.from.fp16</tt>' intrinsic function performs
a conversion from half precision floating point format to single precision
floating point format.</p>
<h5>Arguments:</h5>
<p>The intrinsic function contains single argument - the value to be
converted.</p>
<h5>Semantics:</h5>
<p>The '<tt>llvm.convert.from.fp16</tt>' intrinsic function performs a
conversion from half single precision floating point format to signle
precision floating point format. Since the format is storage only the
argument is represented by an <tt>i16</tt> value.</p>
<h5>Examples:</h5>
<pre>
%a = load i16* @x, align 2
%res = call f32 @llvm.convert.from.fp16(i16 %a)
</pre>
</div>
<!-- ======================================================================= -->
<div class="doc_subsection">
<a name="int_debugger">Debugger Intrinsics</a>