[llvm-commits] CVS: llvm/docs/LangRef.html
Chris Lattner
lattner at cs.uiuc.edu
Thu Aug 12 12:12:40 PDT 2004
Changes in directory llvm/docs:
LangRef.html updated: 1.71 -> 1.72
---
Log message:
Add description of packed type support.
Patch contributed by Brad Jones!
---
Diffs of the changes: (+40 -22)
Index: llvm/docs/LangRef.html
diff -u llvm/docs/LangRef.html:1.71 llvm/docs/LangRef.html:1.72
--- llvm/docs/LangRef.html:1.71 Fri Jul 2 16:08:14 2004
+++ llvm/docs/LangRef.html Thu Aug 12 14:12:28 2004
@@ -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 @@
<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 @@
</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> < <# elements> x <elementtype> ><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><4 x int></tt>: Packed vector of 4 integer values.<br>
+<tt><8 x float></tt>: Packed vector of 8 floating-point values.<br>
+<tt><2 x uint></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 @@
<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 @@
<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 @@
<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 @@
<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 @@
<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 @@
<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
@@ -2593,7 +2611,7 @@
<a href="mailto:sabre at nondot.org">Chris Lattner</a><br>
<a href="http://llvm.cs.uiuc.edu">The LLVM Compiler Infrastructure</a><br>
- Last modified: $Date: 2004/07/02 21:08:14 $
+ Last modified: $Date: 2004/08/12 19:12:28 $
</address>
</body>
</html>
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