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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 - llvm-diff produces non-empty diff in the same code for static variables referencing"
href="https://bugs.llvm.org/show_bug.cgi?id=48137">48137</a>
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<th>Summary</th>
<td>llvm-diff produces non-empty diff in the same code for static variables referencing
</td>
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<th>Product</th>
<td>new-bugs
</td>
</tr>
<tr>
<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
</td>
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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
</td>
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<th>Component</th>
<td>new bugs
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
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<th>Reporter</th>
<td>khitrin@gmail.com
</td>
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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=24143" name="attach_24143" title="full clang-produced IR file">attachment 24143</a> <a href="attachment.cgi?id=24143&action=edit" title="full clang-produced IR file">[details]</a></span>
full clang-produced IR file
Looks like a follow-up for <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - llvm-diff finds differences in the same code"
href="show_bug.cgi?id=33623">bug 33623</a>.
$ cat a.cpp
struct S {
};
// removing static eliminates the bug
static S s;
void* func() {
return &s;
}
$ clang a.cpp -S -emit-llvm
$ llvm-diff a.ll a.ll
in function _Z4funcv:
in block %0 / %0:
> ret i8* getelementptr inbounds (%struct.S.0, %struct.S.0* @_ZL1s, i32
0, i32 0)
< ret i8* getelementptr inbounds (%struct.S, %struct.S* @_ZL1s, i32 0,
i32 0)
$ llvm-diff -version
LLVM (<a href="http://llvm.org/">http://llvm.org/</a>):
LLVM version 11.0.0
Optimized build.
Default target: x86_64-apple-darwin18.7.0
Host CPU: haswell
Reduced testcase with the same llvm-diff output:
$ cat a_reduced.ll
%struct.S = type { i8 }
@_ZL1s = internal global %struct.S zeroinitializer, align 1
define i8* @_Z4funcv() {
ret i8* getelementptr inbounds (%struct.S, %struct.S* @_ZL1s, i32 0, i32 0)
}
Also reproducible on llvm-12 development build for Debian</pre>
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