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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Compiler thinks function is undefined behavior after 292077072e"
href="https://bugs.llvm.org/show_bug.cgi?id=49022">49022</a>
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<th>Summary</th>
<td>Compiler thinks function is undefined behavior after 292077072e
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<th>Product</th>
<td>new-bugs
</td>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>All
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<th>Status</th>
<td>NEW
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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>new bugs
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>douglas_yung@playstation.sony.com
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<th>CC</th>
<td>htmldeveloper@gmail.com, llvm-bugs@lists.llvm.org
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<p>
<div>
<pre>We have an internal test that prior to commit
292077072ec1279d89d21873fe900061e55ef936 produced code for the following
function:
void operator delete(void *p) noexcept {}
int test() {
int *p = new int;
delete p;
return 1;
}
When compiled with optimizations enabled (-O2), it would generate the following
llvm IR:
; Function Attrs: norecurse nounwind readnone uwtable willreturn mustprogress
define dso_local i32 @_Z4testv() local_unnamed_addr #1 {
entry:
ret i32 1
}
But now after 292077072e the compiler seems to think the function is now
undefined behavior and emits the following for it:
; Function Attrs: noreturn nounwind uwtable mustprogress
define dso_local i32 @_Z4testv() local_unnamed_addr #1 {
entry:
tail call void @llvm.trap()
unreachable
}
I don't think this is correct, but I'm not sure whether it really is undefined
or not.</pre>
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</p>
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