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<base href="https://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Usage of attribute address_space causes error in backend"
href="https://llvm.org/bugs/show_bug.cgi?id=23114">23114</a>
</td>
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<th>Summary</th>
<td>Usage of attribute address_space causes error in backend
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<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>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>LLVM Codegen
</td>
</tr>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>svenk.public@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
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<div>
<pre>Created <span class=""><a href="attachment.cgi?id=14144" name="attach_14144" title="run script">attachment 14144</a> <a href="attachment.cgi?id=14144&action=edit" title="run script">[details]</a></span>
run script
Casting to a pointer with the 'address_space' attribute causes a fatal error in
the backend.
Error message:
fatal error: error in backend: Cannot select: 0x38752a0: i64 = addrspacecast
0x3875190[0 -> 257] [ORD=8] [ID=12]
0x3875190: i64,ch = load 0x3875080, 0x3874910, 0x3874b30<LD8[%1]> [ORD=7]
[ID=11]
0x3874910: i64 = FrameIndex<0> [ID=2]
0x3874b30: i64 = undef [ID=3]
In function: func
clang-3.7: error: clang frontend command failed with exit code 70 (use -v to
see invocation)
Example code to reproduce error:
#define FS_RELATIVE __attribute__((address_space(257)))
void func(char * p1, char * p2) {
FS_RELATIVE char * p11 = (FS_RELATIVE char *) p1; /* 01 */
*p11 = *p2;
}
Possible workaround is to introduce a cast to a non-pointer-type, i.e. replace
line marked /* 01 */ with:
FS_RELATIVE char * p11 = (FS_RELATIVE char *)(unsigned long)p1;</pre>
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