<html>
<head>
<base href="http://llvm.org/bugs/" />
</head>
<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - aggregate store isn't optimized properly"
href="http://llvm.org/bugs/show_bug.cgi?id=16316">16316</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>aggregate store isn't optimized properly
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>All
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>Scalar Optimizations
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>deadalnix@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Code below can't be optimized further by LLVM :
%A__vtbl = type { i8*, i32 (%A*)* }
%A = type { %A__vtbl* }
@A__vtblZ = constant %A__vtbl { i8* null, i32 (%A*)* @A.foo }
@A__initZ = constant %A { %A__vtbl* @A__vtblZ }
define i32 @_Dmain() {
body:
%0 = tail call i8* @_d_allocmemory(i64 8)
%1 = bitcast i8* %0 to %A*
; %optimized = bitcast i8* %0 to %A__vtbl**
; store %A__vtbl* @A__vtblZ, %A__vtbl** %optimized, align 8
store %A { %A__vtbl* @A__vtblZ }, %A* %1, align 8
%2 = getelementptr inbounds %A* %1, i32 0, i32 0
%vtbl.i = load %A__vtbl** %2, align 8
%3 = getelementptr inbounds %A__vtbl* %vtbl.i, i64 0, i32 1
%4 = load i32 (%A*)** %3, align 8
%5 = tail call i32 %4(%A* %1)
ret i32 %5
}
define i32 @A.foo(%A* nocapture %this) nounwind readnone {
body:
ret i32 42
}
declare i8* @_d_allocmemory(i64)
I the store is replaced by the commented code just above, the LLVM is able to
do its job and optimize the virtual call, inline and directly return 42.</pre>
</div>
</p>
<hr>
<span>You are receiving this mail because:</span>
<ul>
<li>You are on the CC list for the bug.</li>
</ul>
</body>
</html>