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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Complex double passed as an argument in c uses a spill and ldc1 rather than a pair of mtc1/mthc1 on mips32r2"
href="https://bugs.llvm.org/show_bug.cgi?id=39902">39902</a>
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<th>Summary</th>
<td>Complex double passed as an argument in c uses a spill and ldc1 rather than a pair of mtc1/mthc1 on mips32r2
</td>
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<th>Product</th>
<td>libraries
</td>
</tr>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</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>enhancement
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Backend: MIPS
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
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<th>Reporter</th>
<td>cassandra.l.mccord@gmail.com
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
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<p>
<div>
<pre>Compiling the following code snippet using clang results in the arguments
spilling to the stack and the using ldc1 rather than a pair of mtc1/mthc1 on
mips32r2 with -mfp32.
The exact flags used during compilation -O3 -target mipsel -S -march=mips32r2
-ffast-math -mfp32 -mtune=mips32r2
#include <complex.h>
complex double __attribute((noinline)) square(complex double c)
{
return c * c;
}
Note that the same is true for the opposite, when calling a function like this
the fp registers are spilled to memory and then loaded back into the argument
registers.</pre>
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