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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - early-cse is triggering lint "call argument type mismatched callee parameter type""
href="https://bugs.llvm.org/show_bug.cgi?id=42380">42380</a>
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<th>Summary</th>
<td>early-cse is triggering lint "call argument type mismatched callee parameter type"
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<th>Product</th>
<td>new-bugs
</td>
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<th>Version</th>
<td>8.0
</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
</td>
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<th>Severity</th>
<td>enhancement
</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>pnkfelix@pnkfx.org
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<th>CC</th>
<td>htmldeveloper@gmail.com, llvm-bugs@lists.llvm.org
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<pre>Created <span class=""><a href="attachment.cgi?id=22136" name="attach_22136" title=".ll input to feed to -early-cse -lint passes.">attachment 22136</a> <a href="attachment.cgi?id=22136&action=edit" title=".ll input to feed to -early-cse -lint passes.">[details]</a></span>
.ll input to feed to -early-cse -lint passes.
The following .ll file when fed into the early-cse optimization, will cause the
lint pass to signal an error, "call argument type mismatched callee parameter
type"
.ll file is attached; it is also available here:
<a href="https://gist.github.com/pnkfelix/8df4508294069f1e5963c5fac7f8f825">https://gist.github.com/pnkfelix/8df4508294069f1e5963c5fac7f8f825</a>
This is spawned off of Rust bug <a href="https://github.com/rust-lang/rust/issues/48310">https://github.com/rust-lang/rust/issues/48310</a>
I do not know enough about the guarantees of the early-cse optimization nor of
the lint system to say whether this is definitively a bug in early-cse, or if
it is a bug in the lint. (One of my fellow Rust developers said it looked like
a bug in the lint, but that was, I think, based on their analysis of the .ll
file prior to LLVM's optimization passes.)
Steps to Reproduce:
1. Download .ll file, named `narrowed-48310.ll`
2. Run `opt -early-cse -lint narrowed-48310.ll`
Illustration:
% ./build/x86_64-unknown-linux-gnu/llvm/bin/opt -early-cse -lint -o /dev/null
narrowed-48310.ll
Undefined behavior: Call argument type mismatches callee parameter type
invoke void bitcast (void (%Bar*)*
@"_ZN59_$LT$narrowed_48310..Bar$u20$as$u20$narrowed_48310..Foo$GT$6borrow17hdd495dfcc8d99ffcE"
to void ({}*)*)({}* align 1 %9)
to label %bb3 unwind label %cleanup
%
(Note that above lint does not trigger without early-cse, as illustrated by the
below variant of the above command.)
% ./build/x86_64-unknown-linux-gnu/llvm/bin/opt -lint -o /dev/null
narrowed-48310.ll
%</pre>
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