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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 --- - Duplicate case blocks in switch can be merged" href="https://urldefense.proofpoint.com/v2/url?u=https-3A__llvm.org_bugs_show-5Fbug.cgi-3Fid-3D24220&d=AwMBaQ&c=8hUWFZcy2Z-Za5rBPlktOQ&r=pF93YEPyB-J_PERP4DUZOJDzFVX5ZQ57vQk33wu0vio&m=6UVZsW_TXuMaizjP-c6kvFmgmF_5u9Uh5LuMuE6H_rY&s=stb5KiiHIwKwBolxWHVhVX9BRPTwSkxEBKdCQU3TF5M&e=">24220</a>
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<th>Summary</th>
<td>Duplicate case blocks in switch can be merged
</td>
</tr>
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<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
</tr>
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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>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Scalar Optimizations
</td>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>listmail@philipreames.com
</td>
</tr>
<tr>
<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>In the following example, many of the case blocks of the switch are identical
and could be merged into a single basic block. This transformation should
likely live inside SimplifyCFG.
declare void @foo()
declare void @bar()
define void @test(i16 %val1, i32 %local_2_) {
bci_84: ; preds = %normal_return12
switch i16 %val1, label %bci_149 [
i16 45, label %bci_90
i16 43, label %bci_103
i16 58, label %bci_116
i16 95, label %bci_129
i16 46, label %bci_142
]
bci_149:
call void @foo()
ret void
bci_158:
call void @bar()
ret void
bci_142: ; preds = %bci_84
%.old = icmp eq i32 %local_2_, 0
br i1 %.old, label %bci_149, label %bci_158
bci_129: ; preds = %bci_84
%_20 = icmp eq i32 %local_2_, 0
br i1 %_20, label %bci_149, label %bci_158
bci_116: ; preds = %bci_84
%_21 = icmp eq i32 %local_2_, 0
br i1 %_21, label %bci_149, label %bci_158
bci_103: ; preds = %bci_84
%_22 = icmp eq i32 %local_2_, 0
br i1 %_22, label %bci_149, label %bci_158
bci_90: ; preds = %bci_84
%_23 = icmp eq i32 %local_2_, 0
br i1 %_23, label %bci_149, label %bci_158
}</pre>
</div>
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