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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - test/CodeGen/X86/asm-invalid-register-class-crasher.ll doesn't test what it attempts to test"
href="http://llvm.org/bugs/show_bug.cgi?id=20672">20672</a>
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<th>Summary</th>
<td>test/CodeGen/X86/asm-invalid-register-class-crasher.ll doesn't test what it attempts to test
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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>Other
</td>
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<th>OS</th>
<td>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
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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>Backend: X86
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>wschmidt@linux.vnet.ibm.com
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<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
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<th>Classification</th>
<td>Unclassified
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<p>
<div>
<pre>I recently debugged a problem on PowerPC exposed by the subject test case. In
the process, I discovered that the test doesn't do what it's intended to do.
During make check-all, the test generates the following script in
test/CodeGen/X86/Output/asm-invalid-register-class-crasher.ll.script:
set -o pipefail;{ not
/home/wschmidt/llvm/build/llvm-test/Release+Asserts/bin/l\
lc <
/home/wschmidt/llvm/llvm-test/test/CodeGen/X86/asm-invalid-register-class-\
crasher.ll -mtriple=i386-apple-darwin 2>&1
/home/wschmidt/llvm/build/llvm-test/\
test/CodeGen/X86/Output/asm-invalid-register-class-crasher.ll.tmp; }
This ends up actually attempting to read from
asm-invalid-register-class-crasher.ll.tmp, which doesn't exist. So the test
fails because of the non-existence of the file, which "not" then reports as
success. The IR in the test case is ignored.
The RUN line in the test is:
; RUN: not llc < %s -mtriple=i386-apple-darwin 2>&1 %t
I tried changing this to
; RUN: not llc < %s -mtriple=i386-apple-darwin >%t 2>&1
but "not" returns 1 in this case. Not sure how you want to fix this up but
it's not particulary useful as is (except for helping expose an elusive
self-hosting clang bug for PowerPC when opening a missing file). ;)</pre>
</div>
</p>
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