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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Sink: moves calls that may not return"
href="https://bugs.llvm.org/show_bug.cgi?id=51846">51846</a>
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<th>Summary</th>
<td>Sink: moves calls that may not return
</td>
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<th>Product</th>
<td>libraries
</td>
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<th>Version</th>
<td>trunk
</td>
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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>Keywords</th>
<td>miscompilation
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Scalar Optimizations
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>nunoplopes@sapo.pt
</td>
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<th>CC</th>
<td>changpeng.fang@amd.com, florian_hahn@apple.com, hongtao.yu@outlook.com, i@maskray.me, llvm-bugs@lists.llvm.org
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<p>
<div>
<pre>Test: Transforms/Sink/call.ll
Transformation only valid if willreturn & nounwind attributes are present.
define i32 @test_sink_no_stores(i1 %z) {
%0:
%l = call i32 @f_load_global() nowrite nofree
br i1 %z, label %true, label %false
%false:
ret i32 0
%true:
ret i32 %l
}
=>
define i32 @test_sink_no_stores(i1 %z) {
%0:
br i1 %z, label %true, label %false
%false:
ret i32 0
%true:
%l = call i32 @f_load_global() nowrite nofree
ret i32 %l
}
Transformation doesn't verify!
ERROR: Source is more defined than target
Example:
i1 %z = undef
Source:
i32 %l = UB triggered!
SOURCE MEMORY STATE
===================
NON-LOCAL BLOCKS:
Block 0 > size: 0 align: 1 alloc type: 0
Block 1 > size: 0 align: 1
Target:
UB triggered on br</pre>
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