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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - update_test_checks.py is reusing the same TMP name for overlapping values"
href="https://bugs.llvm.org/show_bug.cgi?id=45951">45951</a>
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<th>Summary</th>
<td>update_test_checks.py is reusing the same TMP name for overlapping values
</td>
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<th>Product</th>
<td>tools
</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
</td>
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<th>Status</th>
<td>NEW
</td>
</tr>
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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>support scripts
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>quentin.colombet@gmail.com
</td>
</tr>
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<th>CC</th>
<td>greg.bedwell@sony.com, i@maskray.me, llvm-bugs@lists.llvm.org
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<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=23495" name="attach_23495" title="Reproducer">attachment 23495</a> <a href="attachment.cgi?id=23495&action=edit" title="Reproducer">[details]</a></span>
Reproducer
I found a bug where the update script will reuse the same temporary name for
two variables that overlap.
Essentially the test case looks like:
tmp1 = …
%1 = …
= %1
= %tmp1
And update_test_checks.py will assign TMP1 to both %1 and %tmp1.
To reproduce:
update_test_checks.py --opt-binary opt wrong_update.orig.ll
Result:
The generated REGEX will have something like:
; CHECK-NEXT: [[TMP1:%.*]] = call float @eggs(<4 x float>* getelementptr
inbounds ([2 x <4 x float>], [2 x <4 x float>]* @global.5, i32 0, i32 0), <4 x
float>* @global)
<...>
; CHECK-NEXT: [[TMP1:%.*]] = call i32 @wibble(i16 2, i16 1, i16 -1, i16 0,
i16 20, i16 0, i16 0)
; CHECK-NEXT: [[TMP4:%.*]] = bitcast i32 [[TMP1]] to <4 x i8>
<...>
; CHECK-NEXT: [[TMP9:%.*]] = insertelement <4 x float> undef, float
[[TMP1]], i32 0
This is wrong, since the second TMP1 use (happening on the definition of TMP9)
should use the value from the first TMP1.</pre>
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