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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - r244578 broke x86 codegen for -Oz"
href="https://llvm.org/bugs/show_bug.cgi?id=24649">24649</a>
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<th>Summary</th>
<td>r244578 broke x86 codegen for -Oz
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
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<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>Backend: X86
</td>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>glider@google.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>For the following testcase:
$ cat compress.c
static int zisofs_readpage() {
struct page *pages[({ (1 << (*(unsigned char *)(0xfeedface)) ); } )];
return zisofs_uncompress_block(0, 0, 0, 0, pages, 0, 0);
}
int (*readpage)() = zisofs_readpage;
Clang r244578 reports an error when compiling with -Oz and -no-integrated-as:
$ clang -target x86_64-cros-linux-gnu -no-integrated-as -Oz -w -c
compress.c
/tmp/compress-1e6ca5.s: Assembler messages:
/tmp/compress-1e6ca5.s:35: Error: operand type mismatch for `pop'
/tmp/compress-1e6ca5.s:36: Error: operand type mismatch for `pop'
clang-3.8: error: assembler command failed with exit code 1 (use -v to see
invocation)
The same testcase compiles fine with Clang r244577.
It also compiles with r244578 if either -Oz or -no-integrated-as is removed
from the command line.</pre>
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</p>
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