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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [GVNHoist] Invalid hoist of store"
href="https://bugs.llvm.org/show_bug.cgi?id=32153">32153</a>
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<th>Summary</th>
<td>[GVNHoist] Invalid hoist of store
</td>
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<th>Product</th>
<td>libraries
</td>
</tr>
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<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>All
</td>
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<th>OS</th>
<td>All
</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
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</tr>
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<th>Reporter</th>
<td>gberry@codeaurora.org
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>GVNHoist hoists the store to @G in the following code, even though the switch
default path directly to %exit does not store to @G. This is a reduced test
case that was reported by Benjamin Kramer when compiling bash with the GVNHoist
pass moved in the pass pipeline to the beginning of the function simplification
phase.
%struct.__jmp_buf_tag = type { [8 x i64], i32 }
@test_exit_buf = global %struct.__jmp_buf_tag zeroinitializer
@G = global i32 0
define void @test_command(i32 %c1) {
entry:
switch i32 %c1, label %exit [
i32 0, label %sw0
i32 1, label %sw1
]
sw0:
store i32 1, i32* @G
br label %exit
sw1:
store i32 1, i32* @G
br label %exit
exit:
call void @longjmp(%struct.__jmp_buf_tag* @test_exit_buf, i32 1) #0
unreachable
}
declare void @longjmp(%struct.__jmp_buf_tag*, i32) #0
attributes #0 = { noreturn nounwind }</pre>
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