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Add description of packed type support.

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Patch contributed by Brad Jones!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@15704 91177308-0d34-0410-b5e6-96231b3b80d8
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Chris Lattner 2004-08-12 19:12:28 +00:00
parent 8dad40c337
commit a58561b917
1 changed files with 39 additions and 21 deletions
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docs/LangRef.html
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@ -26,7 +26,7 @@
<li><a href="#t_function">Function Type</a></li>
<li><a href="#t_pointer">Pointer Type</a></li>
<li><a href="#t_struct">Structure Type</a></li>
<!-- <li><a href="#t_packed" >Packed Type</a> -->
<li><a href="#t_packed">Packed Type</a></li>
</ol>
</li>
</ol>
@ -398,7 +398,7 @@ classifications:</p>
<tr>
<td><a name="t_firstclass">first class</a></td>
<td><tt>bool, ubyte, sbyte, ushort, short,<br>
uint, int, ulong, long, float, double, <a href="#t_pointer">pointer</a></tt></td>
uint, int, ulong, long, float, double, <a href="#t_pointer">pointer</a>, <a href="#t_packed">packed</a></tt></td>
</tr>
</tbody>
</table>
@ -555,22 +555,29 @@ an <tt>int</tt>.</td>
</tr>
</tbody>
</table>
</div>
<!-- _______________________________________________________________________ --><!--
<div class="doc_subsubsection">
<a name="t_packed">Packed Type</a>
</div>
<!-- _______________________________________________________________________ -->
<div class="doc_subsubsection"> <a name="t_packed">Packed Type</a> </div>
<div class="doc_text">
Mention/decide that packed types work with saturation or not. Maybe have a packed+saturated type in addition to just a packed type.<p>
Packed types should be 'nonsaturated' because standard data types are not saturated. Maybe have a saturated packed type?<p>
<h5>Overview:</h5>
<p>A packed type is a simple derived type that represents a vector
of elements. Packed types are used when multiple primitive data
are operated in parallel using a single instruction (SIMD).
A packed type requires a size (number of
elements) and an underlying primitive data type. Packed types are
considered <a href="#t_firstclass">first class</a>.</p>
<h5>Syntax:</h5>
<pre> &lt; &lt;# elements&gt; x &lt;elementtype&gt; &gt;<br></pre>
<p>The number of elements is a constant integer value, elementtype may
be any integral or floating point type.</p>
<h5>Examples:</h5>
<p> <tt>&lt;4 x int&gt;</tt>: Packed vector of 4 integer values.<br>
<tt>&lt;8 x float&gt;</tt>: Packed vector of 8 floating-point values.<br>
<tt>&lt;2 x uint&gt;</tt>: Packed vector of 2 unsigned integer values.</p>
<p> </p>
</div>
--><!-- *********************************************************************** -->
<!-- *********************************************************************** -->
<div class="doc_section"> <a name="highlevel">High Level Structure</a> </div>
<!-- *********************************************************************** --><!-- ======================================================================= -->
<div class="doc_subsection"> <a name="modulestructure">Module Structure</a> </div>
@ -930,7 +937,9 @@ undefined behavior results.</p>
<div class="doc_text">
<p>Binary operators are used to do most of the computation in a
program. They require two operands, execute an operation on them, and
produce a single value. The result value of a binary operator is not
produce a single value. Although, that single value might represent
multiple data, as is the case with the <a href="#t_packed">packed</a> data type.
The result value of a binary operator is not
necessarily the same type as its operands.</p>
<p>There are several different binary operators:</p>
</div>
@ -945,8 +954,9 @@ Instruction</a> </div>
<p>The '<tt>add</tt>' instruction returns the sum of its two operands.</p>
<h5>Arguments:</h5>
<p>The two arguments to the '<tt>add</tt>' instruction must be either <a
href="#t_integer">integer</a> or <a href="#t_floating">floating point</a>
values. Both arguments must have identical types.</p>
href="#t_integer">integer</a> or <a href="#t_floating">floating point</a> values.
This instruction can also take <a href="#t_packed">packed</a> versions of the values.
Both arguments must have identical types.</p>
<h5>Semantics:</h5>
<p>The value produced is the integer or floating point sum of the two
operands.</p>
@ -969,7 +979,9 @@ instruction present in most other intermediate representations.</p>
<h5>Arguments:</h5>
<p>The two arguments to the '<tt>sub</tt>' instruction must be either <a
href="#t_integer">integer</a> or <a href="#t_floating">floating point</a>
values. Both arguments must have identical types.</p>
values.
This instruction can also take <a href="#t_packed">packed</a> versions of the values.
Both arguments must have identical types.</p>
<h5>Semantics:</h5>
<p>The value produced is the integer or floating point difference of
the two operands.</p>
@ -991,7 +1003,9 @@ operands.</p>
<h5>Arguments:</h5>
<p>The two arguments to the '<tt>mul</tt>' instruction must be either <a
href="#t_integer">integer</a> or <a href="#t_floating">floating point</a>
values. Both arguments must have identical types.</p>
values.
This instruction can also take <a href="#t_packed">packed</a> versions of the values.
Both arguments must have identical types.</p>
<h5>Semantics:</h5>
<p>The value produced is the integer or floating point product of the
two operands.</p>
@ -1014,7 +1028,9 @@ operands.</p>
<h5>Arguments:</h5>
<p>The two arguments to the '<tt>div</tt>' instruction must be either <a
href="#t_integer">integer</a> or <a href="#t_floating">floating point</a>
values. Both arguments must have identical types.</p>
values.
This instruction can also take <a href="#t_packed">packed</a> versions of the values.
Both arguments must have identical types.</p>
<h5>Semantics:</h5>
<p>The value produced is the integer or floating point quotient of the
two operands.</p>
@ -1035,7 +1051,9 @@ division of its two operands.</p>
<h5>Arguments:</h5>
<p>The two arguments to the '<tt>rem</tt>' instruction must be either <a
href="#t_integer">integer</a> or <a href="#t_floating">floating point</a>
values. Both arguments must have identical types.</p>
values.
This instruction can also take <a href="#t_packed">packed</a> versions of the values.
Both arguments must have identical types.</p>
<h5>Semantics:</h5>
<p>This returns the <i>remainder</i> of a division (where the result
has the same sign as the divisor), not the <i>modulus</i> (where the