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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - optimize re-materialization of FP constants"
href="https://bugs.llvm.org/show_bug.cgi?id=35121">35121</a>
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<th>Summary</th>
<td>optimize re-materialization of FP constants
</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>
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<th>OS</th>
<td>All
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>Backend: AArch64
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>compnerd@compnerd.org
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>Consider the following piece of C code:
```
#include <stdarg.h>
void h(va_list);
void g(const char *s, ...) {
va_list args;
va_start(args, s);
h(args);
va_end(args);
}
void f(void) {
g("",
1, 2, 3, 4, 5, 6, 7, 8, 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0,
1, 2, 3, 4, 5, 6, 7, 8, 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0);
}
```
We re-materialize the floating point values twice (once in the GPR and once in
the FPR). The GPR materialization is instantiated to spill onto the stack.
However, it would be possible to use the FPR materialization to spill on to the
stack.</pre>
</div>
</p>
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