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Add info about volatile loads/stores

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@8403 91177308-0d34-0410-b5e6-96231b3b80d8
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Chris Lattner 2003-09-08 18:27:49 +00:00
parent 15c9c0352e
commit f065107bac
1 changed files with 14 additions and 4 deletions
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docs/LangRef.html
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@ -1405,6 +1405,7 @@ instructions), the memory is reclaimed.<p>
<h5>Syntax:</h5>
<pre>
&lt;result&gt; = load &lt;ty&gt;* &lt;pointer&gt;
&lt;result&gt; = volatile load &lt;ty&gt;* &lt;pointer&gt;
</pre>
<h5>Overview:</h5>
@ -1412,7 +1413,12 @@ The '<tt>load</tt>' instruction is used to read from memory.<p>
<h5>Arguments:</h5>
The argument to the '<tt>load</tt>' instruction specifies the memory address to load from. The pointer must point to a <a href="t_firstclass">first class</a> type.<p>
The argument to the '<tt>load</tt>' instruction specifies the memory address to
load from. The pointer must point to a <a href="t_firstclass">first class</a>
type. If the <tt>load</tt> is marked as <tt>volatile</tt> then the optimizer is
not allowed to modify the number or order of execution of this <tt>load</tt>
with other volatile <tt>load</tt> and <tt><a href="#i_store">store</a></tt>
instructions. <p>
<h5>Semantics:</h5>
@ -1434,6 +1440,7 @@ The location of memory pointed to is loaded.
<h5>Syntax:</h5>
<pre>
store &lt;ty&gt; &lt;value&gt;, &lt;ty&gt;* &lt;pointer&gt; <i>; yields {void}</i>
volatile store &lt;ty&gt; &lt;value&gt;, &lt;ty&gt;* &lt;pointer&gt; <i>; yields {void}</i>
</pre>
<h5>Overview:</h5>
@ -1443,8 +1450,11 @@ The '<tt>store</tt>' instruction is used to write to memory.<p>
There are two arguments to the '<tt>store</tt>' instruction: a value to store
and an address to store it into. The type of the '<tt>&lt;pointer&gt;</tt>'
operand must be a pointer to the type of the '<tt>&lt;value&gt;</tt>'
operand.<p>
operand must be a pointer to the type of the '<tt>&lt;value&gt;</tt>' operand.
If the <tt>store</tt> is marked as <tt>volatile</tt> then the optimizer is not
allowed to modify the number or order of execution of this <tt>store</tt> with
other volatile <tt>load</tt> and <tt><a href="#i_store">store</a></tt>
instructions.<p>
<h5>Semantics:</h5> The contents of memory are updated to contain
'<tt>&lt;value&gt;</tt>' at the location specified by the
@ -1895,7 +1905,7 @@ arbitrarily complex and require memory allocation, for example.<p>
<address><a href="mailto:sabre@nondot.org">Chris Lattner</a></address>
<!-- Created: Tue Jan 23 15:19:28 CST 2001 -->
<!-- hhmts start -->
Last modified: Tue Sep 2 19:41:01 CDT 2003
Last modified: Mon Sep 8 13:27:14 CDT 2003
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</font>
</body></html>