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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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@ -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 describe a region of memory, and all memory objects in LLVM are
accessed through pointers.</p> 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 <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> 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 global is forced to have at least that much alignment. All alignments must be
a power of 2.</p> a power of 2.</p>
<p>For example, the following defines a global with an initializer, section, <p>For example, the following defines a global in a numbered address space with
and alignment:</p> an initializer, section, and alignment:</p>
<div class="doc_code"> <div class="doc_code">
<pre> <pre>
@G = constant float 1.0, section "foo", align 4 @G = constant float 1.0 addrspace(5), section "foo", align 4
</pre> </pre>
</div> </div>
@ -1256,7 +1261,10 @@ instruction.</p>
<div class="doc_text"> <div class="doc_text">
<h5>Overview:</h5> <h5>Overview:</h5>
<p>As in many languages, the pointer type represents a pointer or <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> <h5>Syntax:</h5>
<pre> &lt;type&gt; *<br></pre> <pre> &lt;type&gt; *<br></pre>
<h5>Examples:</h5> <h5>Examples:</h5>
@ -1265,6 +1273,7 @@ reference to another object, which must live in memory.</p>
<td class="left"> <td class="left">
<tt>[4x i32]*</tt><br/> <tt>[4x i32]*</tt><br/>
<tt>i32 (i32 *) *</tt><br/> <tt>i32 (i32 *) *</tt><br/>
<tt>i32 addrspace(5)*</tt><br/>
</td> </td>
<td class="left"> <td class="left">
A <a href="#t_pointer">pointer</a> to <a href="#t_array">array</a> of 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 A <a href="#t_pointer">pointer</a> to a <a
href="#t_function">function</a> that takes an <tt>i32*</tt>, returning an href="#t_function">function</a> that takes an <tt>i32*</tt>, returning an
<tt>i32</tt>.<br/> <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> </td>
</tr> </tr>
</table> </table>