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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Large contant materialized twice"
href="http://llvm.org/bugs/show_bug.cgi?id=17784">17784</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>Large contant materialized twice
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>All
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>Common Code Generator Code
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>rafael.espindola@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Given
#include <stdint.h>
uint64_t val, *p;
extern uint64_t xtr( uint64_t);
uint64_t caller() {
uint64_t x;
p = &val;
x = 12345123400L;
*p = x;
return xtr(x);
}
clang produces
movq %rax, (%rcx)
movabsq $12345123400, %rcx ## imm = 0x2DFD3A248
movq %rcx, (%rax)
movabsq $12345123400, %rdi ## imm = 0x2DFD3A248
There was a thread about this bug in:
<a href="http://lists.cs.uiuc.edu/pipermail/llvmdev/2013-August/064535.html">http://lists.cs.uiuc.edu/pipermail/llvmdev/2013-August/064535.html</a></pre>
</div>
</p>
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