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<base href="https://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW " title="NEW --- - @llvm.assume is ignored in case of pointer values" href="https://urldefense.proofpoint.com/v2/url?u=https-3A__llvm.org_bugs_show-5Fbug.cgi-3Fid-3D23894&d=AwMBaQ&c=8hUWFZcy2Z-Za5rBPlktOQ&r=pF93YEPyB-J_PERP4DUZOJDzFVX5ZQ57vQk33wu0vio&m=bruGBflgMddOHRSMPMl1GKO9Bo6p9uMWOv1e3kGNEEo&s=Bgt9GqKuHidI9sKf4Paz5u9zZKb4hGRdiYBo6cg0UNg&e=">23894</a>
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<th>Summary</th>
<td>@llvm.assume is ignored in case of pointer values
</td>
</tr>
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<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>Scalar Optimizations
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>tom.aernoudt@synopsys.com
</td>
</tr>
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<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=14496" name="attach_14496" title="testcase">attachment 14496</a> <a href="attachment.cgi?id=14496&action=edit" title="testcase">[details]</a></span>
testcase
@llvm.assume does not trigger constant propgation in case of pointer values.
eg No constant propagation is done to the retun statement for the following
code:
struct X { unsigned long long* a; };
unsigned long long* fail(X* x)
{
__builtin_assume(x->a == (unsigned long long*)12345678);
return x->a;
}
While for the following code this works as expected:
struct Y { unsigned long long a; };
unsigned long long ok(Y* y)
{
__builtin_assume(y->a == 12345678);
return y->a;
}
The attached testcase can be used to reproduce the issue.</pre>
</div>
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