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Add information on address space qualifiers for pointer types and global

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declarations to the LangRef.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@44860 91177308-0d34-0410-b5e6-96231b3b80d8
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Christopher Lamb 2007-12-11 09:31:00 +00:00
parent a8ed9bf4da
commit 284d992777
1 changed files with 15 additions and 4 deletions
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19
docs/LangRef.html
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@ -668,6 +668,11 @@ variables always define a pointer to their "content" type because they
describe a region of memory, and all memory objects in LLVM are
accessed through pointers.</p>
<p>A global variable may be declared to reside in a target-specifc numbered
address space. For targets that support them, address spaces may affect how
optimizations are performed and/or what target instructions are used to access
the variable. The default address space is zero.</p>
<p>LLVM allows an explicit section to be specified for globals. If the target
supports it, it will emit globals to the section specified.</p>
@ -677,12 +682,12 @@ to whatever it feels convenient. If an explicit alignment is specified, the
global is forced to have at least that much alignment. All alignments must be
a power of 2.</p>
<p>For example, the following defines a global with an initializer, section,
and alignment:</p>
<p>For example, the following defines a global in a numbered address space with
an initializer, section, and alignment:</p>
<div class="doc_code">
<pre>
@G = constant float 1.0, section "foo", align 4
@G = constant float 1.0 addrspace(5), section "foo", align 4
</pre>
</div>
@ -1256,7 +1261,10 @@ instruction.</p>
<div class="doc_text">
<h5>Overview:</h5>
<p>As in many languages, the pointer type represents a pointer or
reference to another object, which must live in memory.</p>
reference to another object, which must live in memory. Pointer types may have
an optional address space attribute defining the target-specific numbered
address space where the pointed-to object resides. The default address space is
zero.</p>
<h5>Syntax:</h5>
<pre> &lt;type&gt; *<br></pre>
<h5>Examples:</h5>
@ -1265,6 +1273,7 @@ reference to another object, which must live in memory.</p>
<td class="left">
<tt>[4x i32]*</tt><br/>
<tt>i32 (i32 *) *</tt><br/>
<tt>i32 addrspace(5)*</tt><br/>
</td>
<td class="left">
A <a href="#t_pointer">pointer</a> to <a href="#t_array">array</a> of
@ -1272,6 +1281,8 @@ reference to another object, which must live in memory.</p>
A <a href="#t_pointer">pointer</a> to a <a
href="#t_function">function</a> that takes an <tt>i32*</tt>, returning an
<tt>i32</tt>.<br/>
A <a href="#t_pointer">pointer</a> to an <tt>i32</tt> value that resides
in address space 5.<br/>
</td>
</tr>
</table>